• 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:
    An imaging system (100) comprising at least one camera (3), a background element (4) and a mirror pair (2a-b), the mirror surfaces of the pair of mirrors being angled apart at an angle d, the imaging system (100) being intended to receive a sample along a main axis extending between the mirrors. The camera (3) is directed towards the mirror pair (2a-b) and the background element (4) comprises a surface facing the mirror pair, and wherein said background element (4) is formed as a cylinder portion with a cylinder axis deviating from the main axis, and wherein the mirrors (2a-b) are arranged with a respective mirror surface edge to edge with each other. Fig. 1
    公开号:SE1450426A1
    申请号:SE1450426
    申请日:2014-04-07
    公开日:2015-10-08
    发明作者:Jaan Luup
    申请人:Cgrain Ab；
    IPC主号:
    专利说明:

    2 subsequent analysis of the images. Inhomogeneous elements in the background can affect and interfere with automated digital image processing and complicate the analysis of the actual sample.
    Thus, there is a need for imaging systems that overcome one or more of the above problems.
    Summary of the invention The invention relates to an imaging system 100 comprising at least one camera 3, a background element 4 and a mirror pair 2a-b. The mirror surfaces of the pair of mirrors lie next to each other along an edge and are angled apart at an angle d. The imaging system is intended to receive a sample along a major axis extending between the mirrors, so that the mirror pair advantageously generates three images of the sample seen from three different points of view. The camera 3 is directed towards the mirror pair 2a-b and the background element 4 comprises a curved surface which is directed towards the mirror pair and provides a background for the images which facilitates image processing.
    In an advantageous embodiment of the invention, a pitch plane extends through the pair of mirrors, at a substantially right angle to the major axis. The main part of the camera 3 is arranged on a first side of the dividing plane and at least part of the background element 4 is arranged on a second side of the dividing plane.
    In this way, the camera does not end up in its own field of view.
    In a further embodiment of the invention, the surface of the background element 4 which is directed towards the mirror pair is illuminated by at least one backlight element 5a-c which is directed towards this surface. With the backlight element directed in this way, no direct light from this ends up in the camera's field of view. Typically, the backlight elements 5a-c are arranged near the outer edge of the background element 4, so that the lighting elements themselves do not fall within the field of view of the camera. In a further embodiment, the imaging system is intended to receive samples 1 with a typical color and the background element 4 has a surface directed towards the mirror pair which has a color which is substantially complementary to the typical color of the sample. For example, the imaging system may be intended to receive seeds 1 and the background element 4 is then with particular advantage blue.
    One of the advantages of the present invention is that it becomes possible to image objects with the aid of your images and to provide a more homogeneous background than known technology.
    Brief Description of the Figures Fig. 1 schematically shows a first embodiment of the invention seen from above Fig. 2 schematically shows the first embodiment of the invention seen from the side Fig. 3 schematically shows a background element viewed from above its upper edge Fig. 4 shows a second embodiment of the invention from a first perspective Fig. 5 shows parts of the second embodiment of the invention from a second perspective Fig. 6 shows a further embodiment of an imaging system according to the invention. Description of Preferred Embodiments An object of the present invention is to provide an imaging system which provides multiple images of a sample against a much more homogeneous background than has been possible with the prior art. The present invention will be mainly described in use in the imaging and analysis of cereals such as e.g. cereals and seeds, but it is equally possible to use in the analysis of other granular objects or foods, e.g. fruit, gravel, balls, etc. These and other objects are achieved by an imaging system according to the characterizing parts of the independent claim.
    In the description of the figures below, reference is made to a main axis (V) and a division plane (D). The major axis is defined by the line along which a sample, typically a seed, moves through the imaging system. A simple and practical way of arranging the imaging system is of course so that the sample falls by its own weight straight down and in that case what is here referred to as the main axis of an actual vertical axis, but one can of course also imagine letting the sample fall slightly obliquely relative to the actual main shaft by means of some type of guide tube or by throwing the sample through the imaging system. In the description, for the sake of simplicity, it is assumed that the main axis corresponds to an axis with a vertical spread so that simple terms that can be used up and down can be used.
    The pitch plane intersects the system and has a distribution that is typically perpendicular to the major axis. For the common case where the main axis is vertical, the dividing plane is typically a horizontal plane. It is to be understood, however, that the pitch plane may describe an extension which is arranged in a manner other than perpendicular to the major axis.
    Fig. 1 schematically shows a first embodiment of an imaging system 100 according to the invention seen, where this is viewed from above, ie. along the major axis (V) previously described. The figure illustrates a sample 1, here in the form of a seed, which falls down through the imaging system between two mirrors 2a-b.
    The mirrors have a respective rectangular mirror surface and are arranged with the respective mirror surface edge to edge with each other. The mirrors are angled apart at an angle α, which in this embodiment is a right angle. Thus, the two mirrors 2a-b form a substantially v-shaped mirror.
    A camera 3 is directed towards the main axis and the seed falling along the main axis, so that a first direct image of the seed appears in the camera. Since the mirrors according to a first embodiment are angled 45 degrees from the line between the camera and the main axis, the seed is imaged through a first mirror 2a in a second image from the side of the camera and through a second mirror 2b in a third image in the camera. In the camera 3, the seed is thus imaged simultaneously seen from three different angles which are selected so that the seed in one and the same image is imaged along its entire circumference.
    In all three images of the seed from three different angles, the camera sees through reflection from both mirrors an underlying background element or background surface 4. The background element 4 is in the figure to simplify the illustration presented as if it was beyond the camera, but in practice need not be but according to a further embodiment it can instead lie below the camera as illustrated in Fig. 2. The background element 4 has such a spread that it covers the entire field of view of the camera 3, as this propagates by double reflections in the mirror pair. In a typical application, the sample is a seed, which is often yellowish white or yellowish and the properties of the background element 4 are advantageously selected in a complementary color, which in this case is suitably blue to achieve the best possible contrast. For other colors of the sample to be analyzed, the complementary color that best enhances the contrast between the sample and the imaged background surface 4 is selected. The background element 4 is illuminated with backlight elements 5a-b, which are also oriented so that the camera does not suffer from secular reactions in the background 4 of the light from the backlight elements 5a-b, which is more clearly illustrated in Figure 2.
    According to a further embodiment, the background element 4 can be designed so that it has properties which, when imaging samples and the background element 4, allow possibilities for further analysis of the sample in a subsequent image processing.
    The backlight elements 5a-b are arranged in connection with the right and left sides of the background, respectively, and directed towards the center of the background, so that they are both outside the field of view of the camera. However, they may be arranged in another way to provide an illumination of the background.
    According to this embodiment, the background element 4 is formed as a cylinder portion with a cylinder axis deviating from the main axis.
    The cylinder portion forms an arc whose inside faces the main axis so that it is approximately over its entire surface directed towards the main axis to achieve the most even possible brightness over the entire surface of the image in all three images of the seed.
    The backlight elements 5a-b also illuminate, partially overlapping, different parts of the background so that it is as evenly illuminated as possible for the same purpose. Thus, the background element 4 constitutes a substantially concave reflecting surface for incident lighting.
    Fig. 2 schematically shows the first embodiment of the imaging system 100 according to the invention seen from the side. Here the main axis V is illustrated as a dashed line extending as through the center of the seed 1. The direction of movement of the seed is also illustrated for the sake of clarity with an arrow pointing downwards in the figure. Since the seed is located between the mirrors in the mirror pair 2a-b, it is thus illustrated in a partial cross-section and is therefore produced with dashed lines. 10 15 20 25 30 7 The dividing plane D extends perpendicular to the plane of the paper along a line from right to left and cuts straight through the position of the seed as it is placed in the figure. The camera 3 is arranged above this thinking dividing plane D and is directed obliquely downwards towards the position of the seed. For the sake of clarity, the background element 4 is arranged in its entirety below the dividing plane D, so that what the camera sees, in addition to the seed, consists only of the background element 4. Seen from this perspective, the backlight elements 5b appear to be in the camera's field of view. 1, they are located above and beyond the figure's paper plane and thus outside the camera's field of view.
    The figure also illustrates two sample lighting elements 6a-b, which are arranged obliquely above and obliquely below the sample 1 and the mirror pair 2a-b, respectively. They are arranged offset from the main axis V towards the camera 3 and the background element 4 so as not to be in the way of the falling seed 1 and directed towards the seed 1 in such a way that the light passing through the seed 1 does not hit the camera 3, either directly or via the background. The part of this light which falls outside the mirror pair 2a-b can suitably be absorbed by a first non-illustrated dark light trap and the part which after double reaction in the mirror pair 2a-b is directed approximately towards opposing sample lighting elements, is suitably absorbed by a second non-illustrated dark light trap.
    In the illustrated embodiment, both mirrors in the mirror pair 2a-b have normal in a plane perpendicular to the major axis, respectively. This is of course not absolutely necessary and one can imagine applications where a deviation from this orientation is appropriate, but typically this is optimal.
    In the illustrated embodiment, the camera is arranged in its entirety above the division plane and the background in its entirety is arranged below the division plane D, but in general this is not necessary but the virtual division plane is only support for explaining the location of the components. If the background element 4 is located here beyond the camera S, there is of course nothing to prevent it from extending further above the dividing plane behind the camera 3 and this then allows the camera 3 to be moved from its illustrated position or redirected if this should needed, with part of the background element 4 retained as a background in the image of the seed. One of the points of placing the camera 3 above the dividing plane D is that no part of the camera 3 itself is reproduced in the image from the camera 3, but neither is this strictly necessary but only suitable and advantageous to facilitate subsequent image analysis, where completely three separate images of the seed appears three different angles against a background that is entirely homogeneous and in a complementary color is reproduced in the image from the camera. The image reproduced by the camera thus facilitates future image analysis because it has as homogeneous a background as possible, without disturbing elements other than the sample itself.
    Fig. 3 schematically shows a background element 4 seen from above its upper edge, i.e. from a view which is not parallel to the main axis because the background is angled from the main axis. The background element 4 is illustrated from this perspective as a circle segment with a certain width. Adjacent to what is in the upper edge there is a first figure is the backlight element 5a of the background element 4 which directs light mainly towards the upper part of the background element and in connection with the lower edge of the background element there is a second backlight element 5b Part of the light from the two backlight elements 5a, 5b will be speculatively reflected and to a large extent this reflection will fall on the part of the background element 4 which is not directly illuminated by the respective backlight elements 5a, 5b. In this way, the light from the backlight elements 5a, 5b is used efficiently and distributed in a more homogeneous way than if only direct incident light had been used.
    Fig. 4 shows a second embodiment of an imaging system 100 according to the invention from a first perspective. In the figure, the main axis V is illustrated to facilitate understanding. The camera 3 is in the failure of the figure and is directed towards the mirror pair 2a-b. In this embodiment, the background element 4 is not arranged further from the mirror pair 2a, 2b than the main surface of the camera 3 and is located below the dividing plane. The seed, which is not illustrated here, is illuminated obliquely from below by a lower sample lighting element 6b and seen from above by an upper sample lighting element öa. Each lighting element here consists of groups arranged in rows with LEDs, which can give a diffused light with a wide opening angle. LEDs also have the advantage that they are efficient and can provide light only in a desired wavelength range, and can also be quickly switched off and on to generate lighting only when the seed is in the right position between the mirror pair 2a, 2b.
    The background element 4 also bends in this embodiment in an arc which forms part of a cylinder surface. The background element 4 is here illuminated from both sides in the same way as in the first embodiment with first and second backlight elements 5a-b, but the imaging system here also comprises a third backlight element 5c which illuminates the background element 4 obliquely from above, i.e. above seen from the axis of the cylinder surface. This third backlight element 5c is thus arranged in a manner corresponding to the background element at the position and direction of the sample lighting element 6a-b relative to the mirror pair.
    Fig. 5 shows parts of the second embodiment of the imaging system 100 according to the invention from a second perspective, where the main axis V extends from top to bottom. The figure illustrates the mirror pair 2a-b and the first and second backlight elements 5a-b, while the background element and camera are not visible. Seeds that fall down from an unillustrated groove fall further down into the interior of the mirror pair.
    In the embodiments above, a camera is described, but by this term is meant here any imaging device, CCD cameras or other.
    The mirrors in the mirror pair are here rectangular and angled at 90 ° from each other, but the mirrors can of course be differently designed and angled from each other at an angle other than 90 °.
    The imaging system 100 as above is arranged to generate images and make them available for storage and analysis in connected storage and image analysis equipment, see Figure 6. This can be accomplished by storing images in a memory 200 in the camera and then transferring them to a image processing system 300. Alternatively, the camera may be connected to an external storage medium 200 where the images are stored and then transferred to an image analysis equipment 300 for further analysis. According to a further embodiment, the camera can be directly connected to an image analysis system 300 where the images are analyzed automatically and continuously as long as any sample is present between the mirror pairs. In addition, the imaging system 100 may be connected to a control system that makes it possible to control the imaging system based on the outcome of the subsequent image analysis, e.g. by adjusting the type of images taken based on what was detected during the analysis.
    As described above, the color of the background element 4 can be selected as a complementary color to the sample to be imaged. Depending on the type of camera 3 used, the imaging properties of the background element 4 can be selected to enhance the contrast between the imaged object and the imaged background. Thus, the term color can be used to also indicate that the background element 4 has been given a predetermined pattern or other imaging property that affects a subsequent analysis.
    By means of the above-described embodiments of an imaging system 100, it is possible to image one and the same sample from your different sides and against a homogeneous background, which simplifies a subsequent analysis and image processing. The embodiments described above are only examples, it is understood that the described technique is not limited thereto. Those skilled in the art will appreciate that various modifications, combinations, and modifications may be made to the embodiments without departing from the scope of the claims defined by the appended claims.
    In particular, different sub-solutions in the different embodiments can be combined in other configurations when technically possible.
    权利要求:
    Claims (7)
    [1]
    An imaging system (100) comprising at least one camera (3), a background element (4) and a pair of mirrors (2a-b), the mirror surfaces of the pair of mirrors being angled away from each other at an angle d, the imaging system (100) being intended receiving a sample along a major axis (V) extending between the mirrors, characterized in that the camera (3) is directed towards the mirror pair (Qa-b) and wherein the background element (4) comprises a surface facing the mirror pair, and wherein said background element (4) is designed as a cylinder portion with a cylinder axis deviating from the main axis, and wherein the mirrors (2a-b) are arranged with a respective mirror surface edge to edge with each other.
    [2]
    An imaging system according to claim 1, characterized in that a dividing plane extends through the pair of mirrors at a substantially right angle to the main axis and where the main part of the camera (3) is arranged on a first side of the dividing plane, and where at least part of the background element (4) is arranged on a second side of the dividing plane.
    [3]
    An imaging system according to claim 1 or 2, characterized in that the surface of the background element (4) facing the mirror pair is illuminated by at least one backlight element (Sa-c) directed towards this surface.
    [4]
    An imaging system according to claim 3, characterized in that the backlight elements (5a-c) are arranged near the outer edge of the background element (4).
    [5]
    An imaging system according to any one of the preceding claims, characterized in that the imaging system is intended to receive samples (1) with a typical color and in that the background element (4) has a surface directed towards the mirror pair which has a color which is substantially complementary to the sample. typical color. 13
    [6]
    An imaging system according to claim 5, characterized in that the imaging system is intended to receive seeds (1) and in that the background element (4) has a surface directed towards the mirror pair which is blue.
    [7]
    An imaging system according to any one of the preceding claims, characterized in that light from at least one sample lighting element (öa-b) is directed towards the mirror surfaces of the pair of mirrors, where the sample lighting element is arranged above or below the mirror pair seen from the main axis.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450426A|SE537987C2|2014-04-07|2014-04-07|Imaging system for granular material with homogeneous background|SE1450426A| SE537987C2|2014-04-07|2014-04-07|Imaging system for granular material with homogeneous background|
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