• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Abstract A photography device is provided, comprising an image capturing deviceadapted to capture light entering the image capturing device from a field ofview during an exposure time. The photography device further comprises alight source adapted to illuminate an object visible in the field of view, a firstactuator adapted to move the light source in the field of view, an obscuringmeans adapted to obscure a portion of the field of view, anda second actua-tor. The second actuator is adapted to move the obscuring means such thateach position of the field of view is obscured by the obscuring means for es-sentially an equal amount of time and such that light from the light source isprevented from directly entering the image capturing device. The object canthereby be illuminated from a location in the field of view without the lightsource being visible in the resulting image.
    公开号:SE1450843A1
    申请号:SE1450843
    申请日:2014-07-04
    公开日:2016-01-05
    发明作者:Martin Beskow
    申请人:Mindy Ab；
    IPC主号:
    专利说明:

    PHOTOGRAPHY DEVICE Field of the invention The invention disclosed herein relates generally to the field of photog-raphy devices. More precisely, it relates to a photography device and methodfor illuminating and capturing light from an object to be photographed.
    Background of the invention Photographic lighting relates to the art of illuminating scenes or objectsto be photographed. lllumination is e.g. of interest in controlling and manipu-lating the image in terms of accurate rendition of the object, and for desiredeffects e.g. associated with shadowing and direction, brightness and colour ofthe illumination. Lighting may also create the two-dimensional pattern of con-trast the human brain may interpret to recognise three-dimensional objects inphotographs. Photographic lighting may also be of interest in connection withcomputer aided editing of captured images, especially electronically capturedimages.
    Photographic lighting is known to be provided by means of various il-lumination sources, such as lamps, diffusers and reflectors for directly or indi-rectly illuminating the object. The type, shape, location and direction of theillumination source are examples of parameters of interest for a photographertrying to achieve a desired illumination of the object. By varying the intensityand perceived origin of the light, the object can be illuminated from beneath,the side, the back, the front etc. in order to achieve the desired illumination.Further, by varying the homogeneity and lateral extension of a light beam,effects of contrast can be obtained.
    With regard to the large amount of parameters affecting the illumina-tion, such as shape, number, position, intensity and direction of the illumina-tion sources, there is a need for new and improved photography devices ca-pable of providing a desired illumination.
    Summary of the invention According to a first general aspect, there is provided a photographydevice comprising an image capturing device and a light source. The imagecapturing device is adapted to capture light entering the image capturing de-vice from a field of view during an exposure time, wherein the light source isadapted to illuminate an object visible in the field of view. The photographydevice further comprises a first actuator that is adapted to move the lightsource in the field of view and an obscuring means that is adapted to obscurea portion of the field of view. A second actuator is adapted to move the ob-scuring means such that each position of the field of view is obscured by theobscuring means for essentially an equal amount oftime and such that lightfrom the light source is prevented from directly entering the image capturingdevice. ln a second aspect, a method of capturing light is provided, whereinthe light originates from an object visible in a field of view of an image captur-ing device adapted to capture light entering the image capturing device. Themethod comprises illuminating the object by means of a light source, movingthe light source in the field of view by means of a first actuator, obscuring aportion of the field of view by means of an obscuring means, and moving theobscuring means by a second actuator such that each position of the field ofview is obscured by the obscuring means for essentially an equal amount oftime. Further, the obscuring means is moved such that light from the lightsource is prevented from directly entering the image capturing device. lt will be appreciated that the term 'field of view' (abbreviated FOV)should be understood as the angular extent of a given scene that is imaginedby the image capturing device. The field of view thus refers to that part of theworld that is visible through the image capturing device at a particular positionand orientation in space. Objects or regions outside the FOV during the expo-sure time are not represented in the resulting image. Similarly, objects or re-gions physically located within the FOV but obscured from the image captur-ing device during the whole exposure time are not captured in the image. lfsaid objects or regions are partly obscured, such as obscured for a merely a part of the exposure time, they will however at least partly contribute to theresulting image.
    'Obscuring means' may refer to a piece of material that can be ar-ranged to hide or obscure a portion of the FOV such that the portion is notvisible through the image capturing device. The obscuring means may e.g.comprise a surface facing the image capturing device and thus being cap-tured in place of the obscured portion of the FOV. By using the obscuringmeans for shielding the light source such that light from the light source isprevented, or at least partly prevented from directly entering the image cap-turing device, the image capturing device can be protected from glaring. Mov-ing the obscuring means such that its total contribution to the final image isevenly distributed over the field of view, a resulting image may be providedwherein the photographed object appears to be illuminated by a light sourcenot being visible in the FOV. The contributing surface of the obscuring meansmay advantageously have a homogeneous appearance in order to furtherimprove its perceived invisibility in the image. The contributing surface mayhowever also have an optically distinguishable pattern or structure that can beused for adding a desired visible effect to the resulting image. Further, theobscuring means may be partly light transmitting, i.e. transmit a small amountof the light emitted by the light source. Some of the light is thereby enteredinto the image capturing device trough the obscuring means, which hencemay add a filter-like effect to the resulting image.
    The photography device is based on the underlying insight that the ob-scuring means may be cancelled out from an image if the obscuring meansduring the exposure time is moved across the field of view such that eachpoint of the visible surface of the obscuring means, i.e. each point of the ob-scuring means that is visible from the image capturing device, contributesessentially equally to each portion of the resulting image. ln other words, theexposure of the obscuring means may be essentially constant over the entireimage so as to allow for the imaged obscuring means to be cancelled outfrom the resulting image. This effect may e.g. be achieved by scanning theobscuring means with an essentially constant speed over a plane perpendicu-lar to the optical axis of the image capturing device. ln case of a linear ob- scuring means extending across the FOV, e.g. extending laterally betweentwo opposing sides of the FOV, the obscuring means may be scanned verti-cally across the FOV with an essentially constant speed. The obscuringmeans thereby spends an essentially equal amount of time in any portion ofthe FOV of the image capturing device during the exposure time, and hencethe contribution of the obscuring means, or exposure, may be essentiallyevenly distributed over the image. The term 'essentially equal amount of time'should be understood to include times having a relative difference of 10% orless. lt will however be appreciated that the speed and/or amount of time canbe slightly varied so as to compensate for a varying illumination intensity. Theaccumulated contribution, or exposure, of the obscuring means to a portion ofthe image may be expressed as a function of time spent by the obscuringmeans in the specific position and the intensity of light from the surface of theobscuring means, which surface is captured by the image capturing device.The intensity of light from the surface of the obscuring means may vary duringthe exposure time. The exposure may e.g. be increased due to increased in-tensity of scattered light indirectly illuminating the obscuring means. An in-creased intensity of light captured from of the obscuring means may e.g. becompensated by a momentarily increased speed of motion of the obscuringmeans so as to maintain a relatively constant exposure of the obscuringmeans. Similarly, a reduced intensity of light captured from the obscuringmeans may be compensated by a momentarily reduced speed of the obscur-ing means so as to maintain a relatively constant exposure and thereby allowfor the obscuring means to be cancelled out from the image.
    The light source and the obscuring means may be moved in a scan-ning movement in any plane intersecting the FOV. Consequently, the speedof the motion may be adjusted so as to compensate for a curvature of theplane - a movement in a direction parallel to the optical axis may e.g. be per-formed at a relatively high speed as compared with the speed of a movementin a direction perpendicular to the optical axis in order to allow for the obscur-ing means to obscure each position of the FOV, as seen from the image cap-turing device, for essentially an equal amount of time. The same reasoningmay apply for a light source and obscuring means moving along e.g. a helical path enclosing the illuminated object, wherein the speed of motion may bevaried so as to obtain an essentially constant exposure of the obscuringmeans.
    The photography device and method according to these aspects areadvantageous in that the object can be illuminated from a location in the fieldof view without the light source being visible in the resulting image. Since theobscuring means is moved such that each position of the field of view is ob-scured for essentially an equal amount of time, the total contribution of theobscuring means to the final image, i.e. the total exposure of the obscuringmeans, mat be essentially evenly distributed over the field of view and hencenot distinguishable for an observer. The position from where the illuminationis provided may therefore be chosen irrespective of its relative location to theimage capturing device. This provides a large degree of freedom when con-trolling and designing the illumination of the photographed object. ln prior art technology, the object usually is illuminated by a plurality oflamps, diffusers and reflectors that either contribute actively to the illumina-tion, e.g. by generating light that is directed towards the object, or passivelyby reflecting light generated by other illumination sources. As a consequence,it may be necessary to remove lamps, diffusers and reflectors from the sceneso as to avoid unintentional passive illumination caused by light that is re-flected in illumination sources for the moment not in use.
    The present aspects are advantageous in that they reduce the risk ofsuch passive, unintentional illumination from light sources not in use. Sincethe photography device is capable of generating illumination that appears tooriginate from an illumination screen, reflector or lamp light source, or in otherwords capable of 'simulating' a desired illumination source by means of itslight source, the amount of light reflected at the light source may be less thanthe light reflected from an illumination source corresponding to the simulatedone. ln one example, which is discussed for illustrative purposes, the photog-raphy device may be provided with a first light source moving in a plane infront of the object and a second light source moving in a plane behind theobject. The first light source may e.g. simulate an illumination screen provid-ing frontlighting of the object whereas the second light source simulates an illumination screen providing backlighting. The second light source may beobscured, e.g. by the obscuring means obscuring the first light source or by asecond obscuring means, such that light emitted from the second light sourceis prevented from directly entering the image capturing device. However, thesecond light source may also be arranged and/or moved such that light emit-ted from the second light source directly enters the image capturing device,thereby simulating a light emitting surface or structure arranged in the FOVand behind the object. ln case only frontlighting is desired, the second light source may remain (inactivated) outside of the FOV during the exposure time.
    The amount of light reflected at the second light source, thereby passivelycontributing to the backlighting of the object, may hence be reduced or evennegligible as compared with the light that may be reflected at a correspondingillumination screen arranged behind the object. This advantageously allowsfor several different illumination scenes to be provided without the need formoving and adjusting the position of prior art lamps, diffusers, reflectors etc. ln the context of the present application, the terms 'light source' and'light emitting element' are used to define substantially any device or elementthat is capable of emitting radiation in any region or combination of regions ofthe electromagnetic spectrum, for example the visible region, the infrared re-gion, and/or the ultraviolet region, when activated e.g. by applying a potentialdifference across it or passing a current through it. Therefore a light sourcecan have monochromatic, quasi-monochromatic, polychromatic or broadbandspectral emission characteristics. Examples of light sources include semicon-ductor, organic, or polymer/polymeric light-emitting diodes (LEDs). The lightsource may be attached to the obscuring means, which may be adapted toprovide an electrical connection between the obscuring means and the lightsource. One or several actuators may be provided to move the light sourceand/or the obscuring means.
    The photography device may be adapted to allow for several scanningsessions during the exposure time or during one photography session. Thisadvantageously allows for different illumination scenarios to be subsumed inone image, or captured in a respective image or data file. ln one example, aset of different types of illumination sources and/or location of the illumination sources may be simulated in a respective scan and stored in separate datafiles, images or channels so as to enable subsequent offline or online imageprocessing by means of e.g. an image processing software. Examples of dif-ferent illumination scenarios may e.g. include backlighting, frontlighting anddownlighting of the object.
    The image capturing device may e.g. be a camera capable of capturingradiation in any region or combination of regions of the electromagnetic spec-trum, such as the visible region, the infrared region, and/or the ultraviolet re-gion. The camera may advantageously be a digital camera adapted to outputdigital image data, and may be synchronized with the movement of the ob-scuring means and/or the light source. Further, the image capturing devicemay be synchronized with the operation of the light source so as to enablelight to be captured in response to the light source being switched on or off, orin response to a variation in the illumination intensity. ln one embodiment, the light source is adapted to be arranged be-tween the image capturing device and the illuminated object. This advanta-geously provides a photography device wherein the illumination can be gen-erated directly in front of the object without being perceived by an observerstudying the captured image. The light source may e.g. be arranged or movedsuch that the entire FOV is relatively evenly illuminated so as to simulate ho-mogenous frontlighting from an illumination screen arranged between the im-age capturing device and the object. The light source may also be switchedon and off, or at least operated at varying light intensities, during the exposuretime. By e.g. switching on the light source on at positions close to the middleof the FOV, a spot illumination generated from a spot light source positionedclose to the middle of the FOV may be simulated. ln the present embodimentthe light source may be attached to the obscuring means, which advanta-geously allows for the obscuring means and the light source to be operatedby the same actuator. ln one embodiment, the light source comprises a plurality of light emit-ting elements. The light emitting elements may e.g. be arranged in a lineararray, or in a plurality of linear arrays that e.g. may be parallel to each other,in one or several circles, ovals, spirals, squares or any other suitable ar- rangements. The arrangement or distribution of light emitting elements maybe chosen so as to obtain a desired illumination pattern. A light source havinga linear array of light emitting elements at least distributed across the wholewidth of the FOV may provide a simulated homogenous screen illumination,whereas e.g. a light source having light emitting elements arranged in a spotcovering only a portion of the width of the FOV may provide a simulated linearsource of illumination in the resulting image.ln one embodiment, at least two of the plurality of light emitting ele- ments can be individually controlled. This advantageously allows for the illu-mination intensity and/or illumination pattern to be varied between or duringscans. As an example, a linear array of light emitting elements extendingacross the FOV may be used for simulating a spot illumination by increasingthe illumination intensity close to the position of the simulated spot and byreducing or turning off the illumination at positions farther away from the spotposition. Turning off all light emitting elements but one or a few at a certainposition in the array provides a simulated linear illumination source arrangedalong the path of the said position. Some or all of the light emitting elementsmay be possible to control such that the illumination of at least a portion of theFOV can be temporarily reduced during the exposure time. ln one example,the illumination intensity may be reduced as the obscuring means obscuresthe object or at least a portion of the object. As the obscuring means passesin front of the object (as seen from the image capturing device), all light emit-ting elements but the ones passing in front of the object may be turned off. lnanother example, the FOV may be relatively small compared to the total areailluminated by the light source and obscured by the obscuring means duringthe exposure time. ln this case, the illumination intensity may be reduced asthe obscuring means obscures portions of the FOV by turning off all lightemitting elements but the ones passing in the FOV. Reducing the illuminationintensity as the obscuring means (at least partly) obscures the object and/orFOV advantageously allows for the intensity of light captured from the obscur-ing means to be reduced and hence for the exposure of the obscuring meansto be reduced. ln one embodiment, the light source is adapted to emit light with anessentially constant light intensity during the exposure time. An essentiallyconstant light intensity is advantageous in that the light source can be movedwith an essentially constant speed for providing an essentially homogenousillumination the path of the movement of the light source. A relatively homog-enous illumination may facilitate the cancelling-out of the obscuring meansfrom the captured image. ln one embodiment, the first actuator and/or the second actuator maybe adapted to move the light source and/or the obscuring means with an es-sentially constant speed. Additionally, or alternatively, the light source and/orthe obscuring means may be moved step-by-step, or stepwise, between dif-ferent positions of the FOV. The light source may e.g. be adapted to emit lightduring a dwell time in a certain position, and to be inactivated or turned off asthe obscuring means is moving between two positions. ln one embodiment, the obscuring means extends across the FOV,e.g. vertically or laterally. Each position of the FOV may thereby be obscuredby the obscuring means by moving the obscuring means in just one dimen-sion. As an example, an obscuring means extending laterally across the FOVmay be considered. By moving the obscuring means in a vertical directionacross the FOV, each position of the FOV may be obscured by the obscuringmeans in a single movement. The same reasoning also applies for other con-figurations, wherein the obscuring means extend across the FOV in a firstdirection and wherein the obscuring means may be moved in a second direc-tion substantially orthogonal to the first direction. Arranging the obscuringmeans in a lateral direction advantageously allows for the movement to beinduced by means of gravitational force. ln one embodiment, a plurality of obscuring means extend parallel toeach other across the FOV so as to form a grid or lattice. By arranging theobscuring means in a regular pattern at equidistant positions relative to eachother, the time required for obscuring each position of the FOV can be re-duced. lt may be sufficient to move the obscuring means a distance corre-sponding to the grating constant of the grid in order to cancel out the obscur-ing means from the resulting image. Since the grating constant may be cho- sen to be less than the total distance across the FOV, the exposure timeand/or moving speed of the obscuring means may be reduced. A reducedexposure time may be advantageous when photographing other objects thanstill life objects, such as e.g. moving objects. ln one embodiment, the obscuring means is adapted to be arranged infront of the object and the light source is adapted to be arranged behind theobject, as seen from the image capturing device. This advantageously allowsfor the object to be illuminated from behind without glaring the image captur-ing device.
    The invention may be embodied as computer-readable instructions forcontrolling a programmable computer in such manner that it performs thephotography method outlined above. Such instructions may be distributed inthe form of a computer-program product comprising a computer-readablemedium storing the instructions.
    Further objectives of, features of and advantages with the present in-vention will become apparent when studying the following detailed disclosure,the drawings and the appended claims. Those skilled in the art realize thatdifferent features of the present invention, even if recited in different claims,can be combined in embodiments other than those described in the following.
    Brief description of the drawinqs The above, as well as additional objects, features and advantages ofthe present invention, will be better understood through the following illustra-tive and non-limiting detailed description of embodiments of the present in-vention. Reference will be made to the appended drawings, on which: figures 1a and b illustrate a side view of a photography device ar-ranged to photograph an object in accordance with an embodiment of thepresent invention; figure 2 shows a top view of a photography device and an object ac-cording another embodiment; figures 3a and b illustrate the arrangement of two obscuring means inrelation to an object, seen from the image capturing device; 11 figure 4 shows a similar view as in figures 3a and b, wherein the pho-tography device comprises a plurality of parallel obscuring means; figure 5 schematically illustrates a scanning movement of an obscuringmeans across the field of view according to an embodiment of the invention;and figures 6a and b show a side view of a photography device accordingto a further embodiment of the present invention.
    All the figures are schematic and generally only show parts which arenecessary in order to elucidate the invention, whereas other parts may beomitted or merely suggested. Like reference numerals refer to like elementsthroughout.
    Detailed description of embodiments Figure 1a shows a side view of a photography device 100 arranged tophotograph a scene, such as an object O. The photography device 100 com-prises an image capturing device, such as a camera 110, adapted to capturelight from a field of view A during an exposure time. ln figure 1 the FOV A isdefined by dashed lines. Hence, the dashed lines delimit the angular extentthe FOV. The photography device 100 further comprises a light source 120which is adapted to illuminate the object O, either by a direct illumination or byindirect illumination. The light source 120 may e.g. comprise a light emittingdiode (LED) and can be moved in the FOV A by means of a first actuator (notshown). The direction of movement is indicated by an arrow. An obscuringmeans, such as e.g. a screen 140, is provided in front of the light source 120(as seen from the camera 110) so as to obscure the light source 120 from thecamera 110 and thereby reduce the risk ofglare. The obscured region is indi-cated by diagonal cross-hatching. The screen 140 may be actuated, ormoved, in the FOV A by means of a second actuator (not shown). The firstand/or second actuator(s) may e.g. be realized by a gantry or the like.
    During operation, the screen 140 is moved in the FOV A such eachposition of the FOV A is obscured for essentially an equal amount of time dur-ing the exposure time. 12 Figure 1b shows an embodiment of a photography device 100 similarto the device described with reference to figure 1a. ln the present embodi-ment, however, the object O can be positioned between the light source 120and the screen 140 such that the screen 140 is located in front of the object Oand the light source 120 behind the object O as seen from the camera. Aback light illumination of the object O may thereby be provided.
    Figure 2 shows a top view of a photography device 100 similarly con-figured as the photography devices described with reference to figures 1a and1b. ln the present embodiment the screen 140 and the light source 120 areoppositely arranged on a respective side of the object O. The screen 140 maybe movable in a plane perpendicular to the optical axis of the camera 100 bymeans of a second actuator 150 that may be arranged outside the FOV A.The light source 120 may comprise a plurality of light emitting elements 122arranged in a linear array which, according to the present embodiment, ex-tends laterally across the FOV A. The light emitting elements 122 may e.g. belight emitting diodes (LEDs), each of which being individually controllable. Theintensity of the emitted light may e.g. be varied as a function of time and/orposition of the respective light emitting element 122 so as to provide a desiredor predetermined illumination of the object O. Alternatively, or additionally, thelight emitting elements 122 may be switched on and off at various positions inthe FOV A. Further, a first actuator 130 may be arranged to move the lightsource 120 in the field of view during the exposure time. lt will however berealized that the light source 120 and the screen 140 may be operated andmoved independently as long as the screen 140 obscures the light source120 from the camera 110.
    With reference to figures 3a and b, the operation of a photography de-vice similar to the photography devices described in connection with figures1a-b and 2 is described. According to the embodiment of figure 3a, the pho-tography device 100 comprises two bar-shaped obscuring means 140 extend-ing across (and beyond) the FOV A, which in figure 3 is shown from the posi-tion of the image capturing device, or camera 110, and indicated by a dashedline. ln this embodiment, the FOV A forms a part of the total area covered bythe two bar-shaped obscuring means 140. The first obscuring means may 13 extend laterally across the FOV A and the second obscuring means may ex-tend vertically across said FOV A. A first actuator 130 may be arranged toguide and move both obscuring means in a lateral and vertical direction, re-spectively. The respective directions of movement are indicated by arrows. Aplurality of light emitting elements 122 (indicated by dotted lines) are arrangedon the rear side of the obscuring means 140 and adapted to illuminate theobject O arranged in the FOV A. For illustrative purposes, the FOV A and thearea possible to obscure by the obscuring means 140 in the present figure 3ais divided into a plurality of portions p, or pixels, by a grid. As shown in figure3a, each portion p may represent, or indicate, the position of a light emittingelement 122 at a given instant oftime as the light source 120 and screen 140moves, e.g. towards, across and past the FOV A. During the exposure time,the lateral and/or vertical screen 140 and its respective light emitting elements122 may be scanned over the FOV with a constant speed, or stepwise be-tween each row/column of pixels p of the FOV A such that the screen(s) dwellin each pixel p of the FOV A for an essential equal amount of time. The lightsource 120 may be turned off when moving from one pixel row/column to thenext. The respective light emitting elements 122 may further be individuallyoperated, such as e.g. switched on and off, during the scan. ln figure 3, across-hatched area is indicated and represents the pixels p in which the cor-responding light emitting elements 122 of the vertical and/or lateral lightsources 120 are switched on. Outside the cross-hatching, the light emittingelements 122 are inactivated. lt will be appreciated that the illuminated pixelsp, which are represented by the cross-hatching, may be combined in variousnumbers and into various shapes and distributions so as to achieve a desiredillumination of the object O. ln one example, the vertical obscuring means 140may be scanned across the FOV A as the lateral obscuring means 140 mayremain outside of the FOV A. The lateral obscuring means 140 may bescanned in a subsequent session, in which the vertical obscuring means 130may remain outside the FOV A. ln another example, both obscuring means140 may be scanned simultaneously across the FOV A.
    Figure 3b shows the operation of a similar photography device 100 asdescribed with reference to figure 3a, with the difference that the pixels p may 14 be arranged in a number of sub-groups, or regions pn, such as e.g. p1,p2,..., p9. Each region pn may represent a portion of the area that can beobscured by the obscuring means 140, and in which region pn the illuminationmay be either set at a predetermined level, or turned off as the light source120 passes by. Each region pn may hence be illuminated by the correspond-ing light emitting elements 122 of the vertical and/or lateral light source 120as said light emitting elements 122 pass over said regions pn. ln the exampleillustrated in the present figure, the regions p2 and p8 are only illuminated asthe corresponding light emitting elements 122 of the lateral light source 120pass over the respective regions p2 and p8. Further, the regions p4 and p6are only illuminated as the corresponding light emitting elements 122 of thevertical light source 120 pass over the respective regions p4 and p6. The re-maining regions p1, p3, p5, p7 and p9 may be illuminated by the passing lightemitting elements 122 of the vertical and/or lateral light source 120.
    Figure 4 shows a part of a photography device 100 similarly configuredas the devices described with reference to the previous figures. ln the presentembodiment, the photography device 100 comprises a plurality of obscuringmeans 140, such as e.g. four parallel rod-shaped screens 140 extending lat-erally across the FOV A, which is viewed from the position of the camera 110.Each screen is vertically separated by a distance, or grating constant, d andprovided with a plurality of light emitting elements 122 facing the object O. lnfigure 4 the position of the light emitting elements 122 are indicated by dottedlines and the object O represented by a human subject. During the exposuretime, each one of the screens 140 are moved in the FOV A vertically betweenthe camera 110 and the object O. By arranging the screens 140 equidistantly,each position of the FOV A can be obscured by the screens 140 for essential-ly an equal amount of time during the exposure time by moving the screensthe distance d, or multiples of d. Since the distance d can be chosen suchthat it is less than the total distance across the FOV A, the exposure timeand/or moving speed of the obscuring means 140 can be reduced as well.
    Figure 5 schematically illustrates a scanning procedure during an ex-posure time. The scanning procedure may be combined with a photographydevice similar to the devices described with reference to the preceding fig- ures, wherein the obscuring means 140 may be moved in several directionsin order to obscure each position of the FOV A during the exposure time. lnthe present figure, the obscuring means has the form of a quadrangle. Theposition of the light source 120 is indicated by a dashed line within the quad-rangle. The light source 120 may e.g. be arranged in front of the object (notshown) or behind the object as seen from the camera 110. Similarly, the ob-scuring means 140 may e.g. be arranged in front of the object or behind saidobject, as long as it is arranged to obscure the camera from the light source120 during the exposure time. The obscured positions of the FOV are indicat-ed by a hatched area. During the exposure time, the obscuring means maybe moved along a path (indicated by the line P) in a scanning motion suchthat each position of the FOV A may be obscured for an essentially equalamount of time.
    Figure 6a and b show a top view of a photography device 100 similarto the previously described photography devices. According to the presentembodiment, the photography device 100 comprises an image capturing de-vice 110 adapted to capture light from a FOV A, and four light sources 120arranged on a respective obscuring means 140. The light sourced comprise alinear array of individually controllable light emitting elements 122 configuredto illuminate the object O from different directions, such as e.g. from the back,from the front and from the sides. The obscuring means 140 are guided byactuators arranged to move the obscuring means 140 and the light sources120 in the FOV A during the exposure time. ln figure 6a, the light source 120arranged closest to the camera 110 is turned on, whereas the remaining lightsources 120 are inactive. The object O may therefore mainly be illuminatedby a direct front illumination. Even though some of the light emitted from theactive light source 120 may be reflected from the inactive light sources 120and hence indirectly illuminate the object O from the side and/or back, thereflected intensity may be sufficiently low to be neglected. This is advanta-geous over prior art technology, which utilizes relatively large lamps and/orreflectors so as to illuminate the object, since the surface of the light source120 according to the present invention may be relatively small compared withthe surface of such lamps or reflectors. Since light may be unintentionally re- 16 flected at prior art lamps and reflectors not in use, and hence passively con-tribute to the illumination of the object, it is advantageous to reduce the sur-face of the light sources and screens so as to reduce the amount of reflectedlight.
    While the invention has been illustrated and described in detail in thedrawings and foregoing description, such illustration and description are to beconsidered illustrative or exemplary and not restrictive; the invention is notlimited to the disclosed embodiments. Other variations to the disclosed em-bodiments can be understood and effectuated by those skilled in the art inpracticing the claimed invention, from a study of the drawings, the disclosure,and the appended claims. ln the claims, the word 'comprising' does not ex-clude other elements or steps, and the indefinite article 'a' or 'an' does notexclude a plurality. The mere fact that certain measures are recited in mutu-ally different dependent claims does not indicate that a combination of thesemeasured cannot be used to advantage. A computer program may be storedor distributed on a suitable medium, such as an optical storage medium or asolid-state medium supplied together with or as part of other hardware, butmay also be distributed in other forms, such as via the lnternet or other wiredor wireless telecommunication systems. Any reference signs in the claimsshould not be construed as limiting the scope.
    权利要求:
    Claims (13)
    [1] 1. A photography device, comprising:an image capturing device adapted to capture light entering the imagecapturing device from a field of view during an exposure time;a light source adapted to illuminate an object visible in the field of view;a first actuator adapted to move the light source in the field of view;an obscuring means adapted to obscure a portion of the field of view;a second actuator adapted to, during the exposure time, move the ob-scuring means such that:each position of the field of view is obscured by the obscuringmeans for essentially an equal amount of time; andlight from the light source is prevented from directly entering theimage capturing device.
    [2] 2. The photography device according to claim 1, wherein the light sourceis adapted to be arranged between the image capturing device and the ob-ject.
    [3] 3. The photography device according to claim 1 or 2, wherein the lightsource comprises a plurality of light emitting elements.
    [4] 4. The photography device according to claim 3, wherein the plurality oflight emitting elements are arranged in a linear array.
    [5] 5. The photography device according to claim 4, wherein the light sourcecomprises a plurality of parallel linear arrays.
    [6] 6. The photography device according to any one of claims 3 to 5, whereinthe intensity of light emitted from at least two of the light emitting elementscan be individually controlled. 18
    [7] 7. The photography device according to any one of the preceding claims,wherein the light source is adapted to emit light with an essentially constantintensity during the exposure time.
    [8] 8. The photography device according to any one of the preceding claims,wherein the obscuring means extends laterally or vertically across the field of view.
    [9] 9. The photography device according to claim 8, comprising a plurality ofparallel obscuring means extending across the field of view.
    [10] 10.wherein the first actuator and the second actuator are adapted to move the The photography device according to any one of the preceding claims, light source and the obscuring means, respectively, with an essentially con-stant speed.
    [11] 11. The photography device according to claim 1, wherein the obscuringmeans is adapted to be arranged in front of the object and the light source isadapted to be arranged behind the object, as seen from the image capturingdevice.
    [12] 12.linear light source. The photography device according to claim 1, wherein light source is a
    [13] 13.image capturing device adapted to capture light entering the image capturing A method of capturing light from an object visible in a field of view of an device, wherein the following steps are performed during an exposure time:illuminating the object by means of a light source;moving the light source in the field of view by means of a first actuator;obscuring a portion of the field of view by means of an obscuringmeans;moving the obscuring means by a second actuator such that each po-sition of the field of view is obscured by the obscuring means for essentially 19 an equal amount of time and such that light from the light source is preventedfrom directly entering the image capturing device.
    类似技术:
    公开号 | 公开日 | 专利标题
    US7766489B2|2010-08-03|Device for projecting a pixelated lighting pattern
    US20120274838A1|2012-11-01|Illumination and image capture
    ES2765451T3|2020-06-09|Light recycling for projectors with high dynamic range
    US20170210280A1|2017-07-27|Vehicle headlight device
    RU2012114623A|2013-10-20|COMPUTER RADIOGRAPHY SYSTEMS AND METHODS FOR USING THEM
    US10563839B2|2020-02-18|System and method for preventing light spill
    DE102012213311A1|2014-01-30|Projection with semiconductor light sources, deflecting mirrors and transmitted light areas
    JP2015118362A5|2017-08-10|
    CN109076155A|2018-12-21|The method and photoelectron lighting device, camera and mobile terminal illuminated for the face to people
    TW200914761A|2009-04-01|A light projecting device comprising an array of LEDs
    JP6801661B2|2020-12-16|Lighting equipment and lighting method
    SE1450843A1|2016-01-05|Photography device
    JP2017526475A5|2018-09-13|
    CN109140287A|2019-01-04|Illumination apparatus and correlation method
    US20200292306A1|2020-09-17|3d camera system with rolling-shutter image sensor
    KR102128344B1|2020-06-30|Apparatus for forming camera calibration pattern
    JP2019174308A|2019-10-10|Imaging device, distance calculation method for imaging device, and distance calculation program for imaging device
    JP2004184821A|2004-07-02|Method for manufacturing hologram element, hologram element, illumination apparatus and projection type display apparatus
    JP2020515100A5|2021-02-12|
    JP2003337286A|2003-11-28|Illuminator and illumination method
    CN110383803A|2019-10-25|Compensate vignetting
    US10795238B2|2020-10-06|Light reflection
    TWI654425B|2019-03-21|Lighting device, lighting method and camera device
    CN106796181A|2017-05-31|The method of illuminator, the instruments of inspection with illuminator and operation illuminator
    KR102299343B1|2021-09-08|Pattern skin lighting device of vehicle
    同族专利:
    公开号 | 公开日
    SE538576C2|2016-09-27|
    EP3164986A1|2017-05-10|
    WO2016001031A1|2016-01-07|
    EP3164986B1|2019-02-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    KR101594135B1|2008-07-14|2016-02-15|홀리컴 필름 리미티드|Method and system for filming|
    WO2010088440A1|2009-01-29|2010-08-05|William Connor Delzell|System and method for obtaining photographic and/or videographic images|
    US8676045B1|2011-11-09|2014-03-18|Amazon Technologies, Inc.|Studio arrangement|
    JP2014081474A|2012-10-16|2014-05-08|Olympus Corp|Illuminator for photographing and imaging apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450843A|SE538576C2|2014-07-04|2014-07-04|Photography device and method for illuminating and capturinglight from an object to be photographed|SE1450843A| SE538576C2|2014-07-04|2014-07-04|Photography device and method for illuminating and capturinglight from an object to be photographed|
    PCT/EP2015/064224| WO2016001031A1|2014-07-04|2015-06-24|Photography device|
    EP15733394.9A| EP3164986B1|2014-07-04|2015-06-24|Photography device|
    [返回顶部]