• 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:
    A method of counting people (10) crossing an access passage (103) is based on the acquisition of a video stream by a camera (1). Such a method is particularly suitable for counting the passengers who enter the cabin (102) of an aircraft (100) during a loading or unloading phase.
    公开号:FR3032298A1
    申请号:FR1550788
    申请日:2015-02-02
    公开日:2016-08-05
    发明作者:Patrick Boigas
    申请人:Zodiac Aerotechnics SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a method and a system for counting people. Many situations require counting people who access a place, for example for statistical attendance studies or security conditions. Usually, such counting is done by a dedicated operator, who can be provided with a mechanically operated counter to reduce a risk of counting error. The present invention aims to achieve such a count of people automatically, without mobilizing an operator at the time of passage of people. An additional aim is to allow a subsequent visualization of the counted persons, for example for purposes of verification, or for purposes of investigation, control or search of individuals.
    [0002] For this, a first aspect of the invention proposes a method of counting people who cross an access passage, comprising the following steps: / 1 / arrange at least one camera so that an optical field of the camera contains the access passage; / 2 / capture a video stream of images using the camera, continuously between a counting start time and an end of counting time; / 3 / from a comparison between several successive images of the video stream, detecting at least one appearance or disappearance of a human face or silhouette within the optical field; and / 4 / increment or decrement a count of people if an appearance or disappearance of a face or human silhouette has been detected in step / 3 /. Such a process is simple and inexpensive to implement. In addition, it does not mobilize an operator during the counting period. The access passage can be in particular an access passage to a means of transport, including an access passage to an aircraft cabin. The method is then intended to be implemented during a phase of embarkation or disembarkation of passengers. In certain implementations of the invention, the appearance or disappearance of the human face or silhouette can be detected in step / 3 / from a comparison between respective contents of the successive images, which are located at at least one predetermined edge of the optical field. In this case, the step / 3 / may comprise a distinction between an appearance detection and a disappearance detection, for the face or the human silhouette within the optical field, this distinction being based on a determination of a direction of movement of the human face or silhouette in the successive images at the predetermined edge of the optical field. The step / 4 / can then be an incrementation or a decrementation of the count of the persons, according to whether the distinction has determined a detection of appearance or a detection of disappearance for the face or the human silhouette within the optical field . In improvements of the invention, at least some of the images of the video stream may further be processed to link a mask or scrambling at a location in these images of each human face or silhouette. Thus, the human face or silhouette may appear masked or scrambled during subsequent viewing of the recorded images unless visualization permission without scrambling or mask has been positively controlled prior to viewing. In this way, obligations of respect for privacy and the individual right to the image can be respected. Simultaneously, the recording of the video stream containing the faces of the persons who have crossed the access passage remains available for authorized agents, in particular for verification purposes, or for purposes of investigation, control or research. individuals. In some embodiments of the invention, a plurality of separate access paths may be respectively equipped with cameras, and steps / 1 / to / 3 / are performed separately for each of the access passages. But step / 4 / can be executed for a single count of people, which is common to separate access passes. Such implementations are particularly suitable when several access passages serve in parallel a same site, such as a building open to the public or an aircraft cabin. The single and common count is then a record of the people who are inside this site. A second aspect of the invention proposes a video counting system, which comprises: a camera, which is adapted to capture a video stream of images, continuously between a counting start time and an end of counting instant; ; a human face or silhouette search unit, which is adapted to search for at least one human face or figure within each image; an appearance or disappearance detection unit, which is adapted to detect an evolution of appearance or disappearance for each face or human silhouette that has been found by the research unit, based on a comparison between respective contents of several successive images; and a counter, which is controlled to increment or decrement a count of persons according to an appearance or disappearance detection signal produced by the detection unit.
    [0003] Such a system is adapted to implement a method according to the first aspect of the invention. In order to implement the improvements of the invention which have been mentioned for the first aspect, in particular, the video counting system may further comprise: a video recorder, which is adapted to record at least some of the images captured by the camera ; A scrambling or masking unit, which is adapted to link a scrambling or mask at each location in the recorded images where a human face or figure is located; and an authorization control unit, which is adapted to transmit to a display screen the images processed by the scrambling or masking unit, so that each human face or silhouette appears scrambled or masked during a display of these images on the display screen, unless a visualization authorization without interference or mask has been positively controlled by this authorization control unit. Advantageously, at least one of the elements of the video counting system among the camera, the human face or silhouette search unit, the appearance or disappearance detection unit, and the counter can be shared. with a cabin video surveillance system that is adapted to be installed inside an aircraft. Possibly, the video counting system of the invention may further include an electrical power supply terminal, which is adapted to be connected to a power source that is external to the system itself.
    [0004] Possibly also, the video counting system of the invention may further comprise a data transfer output, this data transfer output being adapted to be connected to a display unit which is external to the system itself. Other features and advantages of the present invention will appear in the following description of an example of non-limiting implementation, with reference to the accompanying drawings, in which: - Figure 1 is an inner plane of aircraft, in elevation ; - Figure 2 reproduces several successive images of a video stream, showing the entrance of a passenger in the plane of Figure 1; and - Figure 3 shows a chain of acquisition and image processing modules, which is adapted to implement the invention. For the sake of clarity, the dimensions of the elements shown in these figures correspond neither to actual dimensions nor to real dimensional ratios. In addition, identical references which are indicated in different figures designate identical elements or which have identical functions. For example, Figure 1 shows the access passage to the cabin of a passenger aircraft. References 100, 101, 102 and 103 denote, respectively, the aircraft as a whole, its cockpit, the cabin in which the rows of seats for passengers are located, and the passenger access passage from outside the vehicle. plane to the inside of the cabin. The access passage 103, which is represented by an arrow in broken lines, can pass through a vestibule which is located between the cockpit 101 and the cabin 102. FIG. 1 shows a passenger referenced 10, who advances inside the vestibule to enter the cabin 102. The passenger 10 therefore follows the access passage 103. According to the invention, a camera 1 is fixed inside the aircraft 100, so that its optical field C contains a cross section of the access passage 103. Thus, the passenger 10 appears in the images of a continuous video stream that is captured by the camera 1. For example, the camera 1 may be located above the intermediate door between the cockpit 101 and the vestibule of the aircraft 100. The camera 1 can be adapted to capture images in the visible spectral range, or in the near infrared spectral range, or in the thermal infrared spectral range. Optionally, it can be adapted to simultaneously capture spectral images in several of these spectral domains, and combination images are then constructed, which result from combinations of several spectral images that were simultaneously captured by the camera 1. The use of Such combination or multispectral images notably make it possible to reduce a probability of false detection of people while retaining information of natural colors. Figure 2 reproduces four successive images 11, 12, 13 and 14 as captured by the camera 1. In this figure, the horizontal axis which is noted t represents the time. The image 11 is captured before the passenger 10 enters the optical field C, the image 12 is captured as it enters the optical field C, the image 13 when the passenger 10 has advanced in the optical field C, then the image 14 when it enters the cabin 102. The appearance of the passenger 10 between the images 11 and 12 can be detected by comparing the respective contents of the two images, especially in an area which is limited to near the right edge of these images. Motion detection can be used, but the combination of motion detection with pattern recognition reduces the risk of false detection of human beings. For this, a face recognition or human silhouette that proceeds by searching for characteristic points, can advantageously be implemented on the mobile elements that are contained in the images, in order to detect the appearance of the passenger 10 in the passage of 103. Software that is capable of performing such face pattern recognition features are known to those skilled in the art. Then, a counter can be incremented by one unit, to count the passengers who have crossed the access passage 103 towards the cabin 102.
    [0005] It is possible for a passenger to exit cabin 102 to the outside of aircraft 100 during the counting period. In this case, such a passenger appears with a direction of movement which is reversed inside the optical field C of the camera 1. A detection of the direction of movement of the passenger 10 in successive images of the video stream, makes it possible to distinguish between an input movement in the aircraft 100 or output to the outside. In a manner that can be implemented simply, the direction of movement of the passenger 10 can be determined by comparing the positions of moving elements that are contained in the images, especially near the right edge of these images. The passenger counter can then be incremented by one unit in the case of a movement in the direction of entry into the aircraft 100, and decremented by one unit in the case of a displacement in the direction of the aircraft. exit to the outside of the aircraft 100. - 7 - The complete video stream that was captured by the camera 1 during boarding can be viewed later by an agent, for example for verification purposes. It is then possible that the distinct appearance of the face of each passenger 10 is not desired, particularly because of the legislation of some countries. In this case, the video stream can be viewed on a screen with scrambling or mask at the location of each passenger's face in the images. The location of the face in each image can be determined by a search unit of the characteristic points of a human face, and the scrambling or mask is introduced locally at this location in the image during a pre-display step. on the screen. Such a scrambling operation or masking faces can be implemented by default for any viewing of the video stream. Optionally, it can be inhibited when a view permission with the faces that appear distinctly is produced by the viewer.
    [0006] Figure 3 shows a combination of acquisition and image processing modules, which is adapted to implement the invention. The numerical references which are indicated in this figure have the following meanings: 1 the camera already introduced 2 search unit of face or human silhouette, denoted RECOGN., To successively process each image captured by the camera 1 3 unit of comparison of contents of images, noted COMPAR., to detect a new appearance or disappearance of human face or silhouette in the optical field C of the camera 1 4 counter, noted COMPT. and activated incrementally or decrementally as a function of a detection signal which is output from the recording unit image content comparison unit 3, denoted RECORD., to record the images captured by the camera 1 - 8-6 scrambling or masking unit, denoted MASK., For introducing interference or masks at the locations of the faces of the passengers in the recorded images, such that these locations have been identified by the face search unit 2 7 unit AUTHOR., to transmit images with interference or masks on passengers' faces in the absence of a valid visualization authorization, or without interference or mask when a valid authorization is introduced in the control unit 7 8 screen image display, noted SCREEN In general, but particularly when the invention is used on board an aircraft, some elé The video counting system may be shared with a cabin video surveillance system (CVMS), as already implemented in some aircraft, and described for example in US Patent 8,127,333. Furthermore, a power supply terminal for providing the power required for the operation of at least some of the elements of the video counting system can be provided for connection to a power source which is external to the aircraft. Thus, the video counting system can be used when the aircraft is at the car park during the loading or unloading phases, without causing excessive energy consumption compared to the capacity of the autonomous electrical production system of the aircraft which is then activated. Finally, the video counting system can be provided with a data transfer output, which is intended to be connected to a display unit external to the aircraft. In this way, the images that are captured by the camera are also accessible to an authorized officer, from a station that is located outside the aircraft. Such a possibility of viewing from outside the aircraft can be useful for security purposes or for managing the embarkation or disembarkation of passengers. It is understood that the invention may be reproduced by modifying certain minor aspects with respect to the detailed description which has just been given. In particular, the camera 1 can be oriented in different ways with respect to the access passage 103. In particular, it can be oriented so that the faces of the passengers appear frontally in the images at least at least one moment of their presence in the images. the optical field C of the camera 1. The camera 1 can be oriented so that the faces thus appear from the front during the entry of the passengers in the cabin 102 of the aircraft 100, 10 or alternatively at their exit. Optionally, several cameras can be used simultaneously, being oriented differently from each other to cover together a whole section of the access passage 103. Finally, the invention is not limited to the implementation of detection algorithm of appearance or disappearance of image contents, which are based on the analysis of images near one or more edges thereof. Similarly, the invention can be implemented without necessarily using a face recognition algorithm or human silhouette. Indeed, only the detection and analysis of the direction of the movements that occur in the optical field C of the camera 1, from the images that are acquired successively, may be sufficient to count the persons according to the invention. Furthermore, the invention can also be applied to an aircraft whose cabin is accessible by several entrances, each of which the passengers can enter the cabin or out. This is the case, for example, for an aircraft in which passengers can enter not only through a door which is located near the cockpit, but also by an aircraft tail door and / or an intermediate door in the length. from the cabin. It can also be applied identically to a two-deck, or two-deck, aircraft in which each deck is served by separate accesses. In such cases of multi-access cabins, a camera is arranged at each access, and the passenger counter, common to all accesses, is incremented or decremented according to the faces or human silhouettes that are detected in the video streams of all the cameras, and evolutions of appearance or disappearance which are determined for each of these faces or human silhouettes. Finally, the invention can also be used advantageously for access (s) to the hold of an aircraft, in particular to ensure that no one remains locked in it at the time of its closure.
    权利要求:
    Claims (12)
    [0001]
    REVENDICATIONS1. A method of counting persons (10) crossing an access passage (103), comprising the steps of: / 1 / disposing at least one camera (1) so that an optical field (C) of the camera contains the access passage (103); / 2 / capture a video stream of images (I1, ..., 14) with the aid of said camera (1), continuously between a counting start time and an end of counting time; / 3 / from a comparison between several successive images (I1, ..., 14) of the video stream, detecting at least one appearance or disappearance of a human face or silhouette within the field optical (C); and / 4 / incrementing or decrementing a count of persons (10) if an appearance or disappearance of a face or human silhouette has been detected in step / 3 /.
    [0002]
    The method of claim 1, wherein the access passage (103) is an access passageway to a transport means, including an access passageway to an aircraft cabin (102), and the method is implemented during a phase of embarkation or disembarkation of passengers.
    [0003]
    3. Method according to claim 1 or 2, wherein the appearance or disappearance of the face or the human silhouette is detected in step / 3 / from a comparison between respective contents of the images (I1 ,. .., 14) which are located at at least one predetermined edge of the optical field (C).
    [0004]
    The method of claim 3, wherein step / 3 / comprises a distinction between an appearance detection and a disappearance detection, for the human face or silhouette within the optical field (C), said a distinction being based on a determination of a direction of movement of said face or said human silhouette in successive images (I1, ..., 14) at said predetermined edge of the optical field; and the step / 4 / is an incrementation or decrementation of the count of persons (10), depending on whether the distinction has determined an appearance detection or a disappearance detection for said face or said human silhouette within the optical field (C).
    [0005]
    The method according to any one of the preceding claims, wherein at least some of the images (I1, ..., 14) of the video stream are further processed to link a mask or scrambling to a location in said images of each face or human silhouette, so that said face or human silhouette appears masked or scrambled during a subsequent viewing of the recorded images, unless a visualization permission without interference or mask has been positively controlled before viewing.
    [0006]
    The method of any one of the preceding claims, wherein a plurality of separate access passages are each equipped with cameras, and steps / 1 / to / 3 / are performed separately for each of said access passages, and step / 4 / is executed for a single count of people, common to separate access passes.
    [0007]
    7. A video counting system comprising: a camera (1) adapted to capture a video stream of images (I1, ..., 14), continuously between a counting start time and an end time of counting; a unit (2) for searching for a face or human silhouette, adapted to search for at least one face or a human silhouette within each image (I1, ..., 14); an appearance or disappearance detection unit (3), adapted to detect an evolution of appearance or disappearance for each human face or silhouette that has been found by the research unit-13 - (2), to from a comparison between respective contents of several successive images (I1, ..., 14); and - a counter (4), controlled to increment or decrement a count of persons (10) according to an appearance or disappearance detection signal, produced by the detection unit (3).
    [0008]
    8. A video counting system according to claim 7, adapted to implement a method according to any one of claims 1 to 4.
    [0009]
    A video counting system according to claim 7 or 8, further comprising: - a video recorder (5), adapted to record at least some of the images (I1, ..., 14) captured by the camera (1 ); a scrambling or masking unit (6) adapted to link a scrambling or mask at each location in the recorded images (I1, ..., 14), where there is a human face or figure; an authorization control unit (7), adapted to transmit to a display screen (8) the images (I1, ..., 14) processed by the scrambling or masking unit (6), so that that each face or human silhouette appears scrambled or masked during a display of said images on the display screen, unless a visualization authorization without interference or mask has been positively controlled by said authorization control unit.
    [0010]
    A video counting system according to any one of claims 7 to 9, wherein at least one of the camera (1), the human face or silhouette search unit (2), the detection unit (3) for appearance or disappearance, and the counter (4) is shared with a cabin video surveillance system adapted to be installed inside an aircraft (100).
    [0011]
    A video counting system according to any one of claims 7 to 10, comprising an electric power supply terminal adapted to be connected to a source of energy external to said video counting system. .
    [0012]
    12. A video counting system according to any one of claims 7 to 11, comprising a data transfer output adapted to be connected to a display unit external to said video counting system.
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    同族专利:
    公开号 | 公开日
    FR3032298B1|2019-05-03|
    US20160224843A1|2016-08-04|
    EP3051503A1|2016-08-03|
    引用文献:
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    法律状态:
    2016-02-26| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-05| PLSC| Publication of the preliminary search report|Effective date: 20160805 |
    2017-07-26| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-20| PLFP| Fee payment|Year of fee payment: 4 |
    2019-01-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 6 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-05-07| CD| Change of name or company name|Owner name: SAFRAN AEROTECHNICS SAS, FR Effective date: 20210330 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1550788A|FR3032298B1|2015-02-02|2015-02-02|METHOD FOR COUNTING PEOPLE|
    FR1550788|2015-02-02|FR1550788A| FR3032298B1|2015-02-02|2015-02-02|METHOD FOR COUNTING PEOPLE|
    EP16153077.9A| EP3051503A1|2015-02-02|2016-01-28|Method for counting people|
    US15/012,963| US20160224843A1|2015-02-02|2016-02-02|Method for counting people|
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