JP2010015258A - Monitoring system, information processing apparatus, information processing method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve tolerability against environmental changes, for monitoring effectively. <P>SOLUTION: A monitoring system receives light signals from a plurality of LED light sources transmitting identification information by the light signals, detects disconnections in detection lines connecting sensor and the LED light sources on the basis of a light source position table in which the position information and the identification information of the plurality of LED light sources are stored in association with each other, and detects the position of a monitoring object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a monitoring system, an information processing apparatus, an information processing method, and a program for monitoring an intruder into a site, for example.

  As one of security systems in a house or facility, there is an intrusion detection system that automatically detects when a suspicious person intrudes into these sites and issues an alarm (see, for example, Patent Document 1). These systems can be categorized into several types based on the different means of detecting intruders.

  FIG. 13A is a diagram illustrating an example of a conventional intrusion detection system using an infrared beam. In this method, an infrared beam light source and an optical receiver are installed at both ends on the boundary line of the site where intrusion is monitored, and an infrared beam is constantly transmitted from the light source and detected by the receiver. When the intruder crosses the boundary, the infrared beam is blocked, so that the intrusion can be detected. However, this method usually has a problem that an intruder straddling or passing through the beam line cannot be detected because only one beam is set at approximately waist height along the boundary line. In this case, it is possible to install multiple beam light sources and receivers and set several beam lines vertically, but many light source-receiver pairs are required to fully detect the passage of an intruder. Necessary and costly.

  In addition, an intrusion detection system in a large site generally uses a pan / tilt / zoom (PTZ) camera that is installed separately. The usage of capturing the person's image is used. However, in the method using the infrared beam, the intruder may not be captured by the PTZ camera because the position where the intruder has entered cannot be accurately determined when the monitoring line is long.

  Further, as shown in FIG. 13B, there is a method of detecting an intruder by image processing using a normal camera as another means for detecting intrusion. This is because a camera is installed in the vicinity of the boundary line of the site, the boundary line is always photographed, motion detection is performed by image processing within the monitoring area defined in the screen, and if a motion is detected, it is determined as an intruder. In the case of image detection, unlike the method using infrared beams, intruders do not miss the intrusion by moving over the surveillance line or passing through, but in order to detect all moving objects, small animals and trees by the wind It is easy to make false detections due to fluctuations in the camera and camera shake. In addition, it cannot be detected when the image itself is broken due to strong sunlight. In addition, at night, the infrared projector is used to illuminate the monitoring area, but the image is noisy and difficult to detect. Further, in the image detection, it is difficult to accurately specify the intrusion position on the monitoring line as in the method using the infrared beam.

  The security system not only detects intrusions on the boundary line of the site, but also detects the presence of the intruder after entering the site across the boundary, and tracks the intruder with a PTZ camera. Is desired. In order to track an intruder, it is necessary to detect the location of the intruder in real time. As a means for specifying the position of the intruder in such a two-dimensional site, there is a technique for specifying the position of the intruder based on the principle of stereo vision using two cameras. However, since this method is also based on image processing, it is vulnerable to environmental changes like intrusion detection by the above-described image processing, and once an intruder is lost from the image, it may not be able to return to tracking again.

JP 2008-15556 A

  As described above, in the conventional intrusion detection system, in particular, resistance (robustness) against environmental changes is not sufficient.

  The present invention has been proposed in view of such a conventional situation, and improves a resistance to environmental changes and can effectively monitor, a monitoring system, an information processing apparatus and an information processing method, and Provide a program.

  The monitoring system according to the present invention includes a plurality of light sources that transmit identification information by an optical signal, a receiving unit that receives the identification information using an area sensor that receives the optical signal for each pixel, the area sensor, and the area sensor. A detection unit configured to detect a blocking of a detection line connecting the light source based on a reception state of the identification information and detect a position of a monitoring target.

  An information processing apparatus according to the present invention connects a reception unit that receives identification information of each light source using an area sensor that receives light signals from a plurality of light sources for each pixel, and the area sensor and the light source. A detection unit configured to detect blocking of the detection line based on a reception state of the identification information and detect a position of a monitoring target.

  Further, the information processing method according to the present invention connects the area sensor and the light source with a receiving step of receiving identification information of each light source using an area sensor that receives light signals from a plurality of light sources for each pixel. A detection step of detecting the interruption of the detection line based on the reception state of the identification information and detecting the position of the monitoring target.

  In addition, the program according to the present invention includes a reception step of receiving identification information of each light source using an area sensor that receives optical signals from a plurality of light sources for each pixel, and a detection line connecting the area sensor and the light source. Is detected based on the reception state of the identification information, and the information processing apparatus is caused to execute a detection step of detecting the position of the monitoring target.

  In this specification, “system” means a logical collection of a plurality of devices or functional modules that realize a specific function, and whether or not each device or functional module is in a single casing. It doesn't matter.

  According to the present invention, the detection line connecting the area sensor and the light source is detected based on the reception state of the identification information from the light source, and the position of the monitoring target is detected, so that it is resistant to environmental changes (robustness). Can be effectively monitored.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. The monitoring system shown as a specific example of the present invention is equipped with a plurality of LED (Light Emitting Diode) light sources that emit different light signals on walls (fences), pillars (poles), etc. set at the boundary of a specific site. Intrusion of a person is detected and tracked by detecting an optical signal blocked by the intrusion by a camera system having an area type (two-dimensional) image sensor.

  For example, when an optical signal is interrupted, the position of a pixel that has received the optical signal is detected, and control is performed so that the position becomes the center of the camera angle of view, thereby tracking an intruder. In addition, for example, if a light source position table that associates and stores position information of a plurality of light sources and identification information based on optical signals is used, an intruder can be detected based on the identification information that is no longer received.

  In such a surveillance camera system, for example, by using IP (Internet Protocol), a plurality of surveillance cameras connected to the network, and video and audio captured by the surveillance camera via the network are monitored, recorded, and reproduced. A large-scale system including an information processing apparatus is constructed.

  FIG. 1 is a block diagram illustrating a configuration example of a surveillance camera. This surveillance camera includes a video data generation unit 11, an imaging operation switching unit 12, and a metadata generation unit 13. The video data generation unit 11 includes a lens unit 21, an imaging unit 22, a video signal processing unit 23, and a data processing unit 24.

  The imaging unit 22 photoelectrically converts imaging light imaged on an imaging element (image sensor) such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) through the lens unit 21 to generate an imaging signal Sv. Further, the image sensor samples the blinking signal from the LED light source as shown in FIG.

  The LED light source blinks at a high speed in order to transmit identification information by an optical signal. For example, as shown in FIG. 2B, the blinking pattern has an 8-bit start code and 8 LED for distinguishing each LED light source. Transmission information is superimposed by Manchester encoding using a combination of a bit ID code and a packet (FIG. 2C). The transmission information includes identification information (ID code) of the LED light source.

  The LED light source preferably emits infrared light or visible light. In the case of infrared light, an excellent detection capability can be achieved even at night by using an infrared camera as the monitoring camera. In the case of visible light, it can also serve as illumination light for illuminating the monitoring area.

  The image sensor receives an optical signal from the LED light source and receives transmission information. For example, by performing frame scanning at a cycle that is approximately four times the flashing cycle of the LED light source, the flashing signal from the LED light source is sampled for each pixel. The blinking pattern obtained by the image sensor is decoded by a subsequent metadata generation unit and processed as metadata described later. Further, the image sensor outputs the generated imaging signal Sv to the imaging signal processing unit 23.

  The imaging signal processing unit 23 performs various signal processing on the imaging signal Sv supplied from the imaging unit 22 to generate video data Dv. For example, knee correction for compressing a certain level or higher of the imaging signal Sv, γ correction for correcting the level of the imaging signal Sv according to a set γ curve, and white clip processing for limiting the signal level of the imaging signal Sv to be within a predetermined range. And black clip processing.

  The data processing unit 24 performs an encoding process on the video data Dv to generate video data Dt in order to reduce the amount of data when communicating with a recorder, an information processing apparatus, and the like.

  The imaging operation switching unit 12 switches the operation of the monitoring camera based on a switching instruction signal CA input from a recorder, an information processing apparatus, or the like so that an optimal captured image is obtained. For example, in addition to switching the imaging direction of the imaging unit 22, the control signal CMa is supplied to the lens unit 21 to switch the zoom ratio and the iris. Therefore, the moving monitoring target can be tracked by sequentially detecting the position of the monitoring target and controlling the pan, tilt, and zoom functions of the monitoring camera based on this position.

  In addition, the imaging operation switching unit 12 supplies the control signal CMb to the imaging unit 22 and the imaging signal processing unit 23 to switch the frame rate of the captured video, or supplies the control signal CMc to the data processing unit 24 to transmit the video data. A process for switching the compression rate is performed.

The metadata generation unit 13 generates metadata Dm indicating information related to the monitoring target. For example, the blinking pattern obtained for each pixel of the image sensor is decoded to obtain transmission information. This transmission information includes the ID of the LED light source, and this is included in the metadata as identification information of the LED light source. The metadata is attribute information of video data captured by the imaging unit 22 of the surveillance camera, and includes the following, for example.
-LED light source identification information-Imaging time data, surveillance camera orientation information (pan, tilt, etc.)
Position Information of Surveillance Camera / Signature Information of Captured Image Next, an information processing apparatus that monitors, records, and plays back video and audio captured by the surveillance camera via a network will be described.

  FIG. 3 is a block diagram illustrating a configuration example of the information processing apparatus. The information processing apparatus includes a network connection unit 101 that performs data transmission with a plurality of monitoring cameras, a video buffer unit 102 that acquires video data from the monitoring cameras, and a metadata buffer unit 103 that acquires metadata from the monitoring cameras. A filter setting database 107 for accumulating filter settings according to filter processing, a metadata filter unit 106 as a filter unit for performing metadata filtering processing, a rule switching unit 108 for notifying the monitoring camera of setting changes, and video A video data storage database 104 that stores data, a metadata storage database 105 that stores metadata, a display unit 111 that displays video data, metadata, and the like, and a process for reproducing video data on the display unit 111. Video data processing unit 109 to perform and metadata It includes a metadata processing unit 110 that performs processing for reproducing the display unit 111, and a play synchronizing section 112 for synchronizing the reproduction of the metadata and video data.

  The video buffer unit 102 acquires video data from the surveillance camera and performs a decoding process on the encoded video data. The video buffer unit 102 has the obtained video data, and sequentially supplies the video data to the display unit 111 that displays an image. Further, the video buffer unit 102 causes the video data storage database 104 to store the stored video data based on the recording request signal supplied from the rule switching unit 108.

  The metadata buffer unit 103 holds metadata acquired from the monitoring camera and sequentially supplies the metadata to the display unit 111. Also, metadata is supplied to the display unit 111 in synchronization with the video data. In addition, the metadata buffer unit 103 stores the metadata acquired from the monitoring camera in the metadata storage database 105.

  The metadata storage database 105 has a light source position table that stores the position information and identification information of a plurality of LED light sources in association with each other. As this position information, for example, orientation information (rotation angle) of each pan / tilt / zoom (PTZ) camera is used. Further, it may be a three-dimensional (XYZ space) position coordinate based on a certain position.

  The filter setting database 107 accumulates filter settings according to the filter processing performed by the metadata filter unit 106 and supplies the filter settings to the metadata filter unit 106. This filter setting is a setting that indicates, for each piece of information related to the monitoring target included in the metadata, whether or not it is necessary to output alarm information or the like and switch the imaging operation of the monitoring camera. . By performing the metadata filtering process using this filter setting, the filtering process result can be shown for each piece of information related to the monitoring target. The filter processing result indicates that it is necessary to output alarm information or the like, and that the imaging operation of the monitoring camera needs to be switched. For example, when a light signal from the LED light source is interrupted, an intruder or the like between the LED light source and the monitoring camera can be monitored by setting a filter that outputs alarm information.

  The metadata filter unit 106 performs metadata filtering using the filter settings stored in the filter setting database 107, and determines whether to generate an alarm. Then, the metadata filter unit 106 performs a filtering process on the metadata acquired by the metadata buffer unit 103 or the metadata supplied from the metadata storage database 105 and notifies the rule switching unit 108 of the filtering process result.

  Here, the metadata filter is a determination condition when generating alarm information. The alarm information is information after filtering based on metadata. This alarm information analyzes metadata of multiple frames, calculates the speed from the change in the detection position of the object, checks whether the object has crossed the boundary line, or analyzes these in combination. It is obtained by.

  For example, when a light signal from an LED light source is interrupted, a light source position table in which position information and identification information of a plurality of LED light sources are stored in association with each other is referred to, and a detection line connecting a monitoring camera and the LED light source The position of the monitoring target is detected, and if this position is within the monitoring area, alarm information is generated. Since the monitoring area can be easily set and changed based on position information of a plurality of LED light sources, a robust monitoring system can be constructed. Further, by analyzing the number of LED light sources shielded by the optical signal and the arrangement positions of the LED light sources, it is possible to detect dimensions such as the size and shape of the monitoring target.

There are, for example, the following seven types of metadata filters, and any of these filter types can be selected.
Appearance: A filter for determining whether an object (hereinafter also referred to as an object) exists in a certain area. Disappearance: Whether an object appears in an area (region) and has left the area. A filter to determine whether or not ・ Passing: A filter to determine whether or not an object has crossed a certain boundary ・ Capacity (number of objects limit): Count the number of objects in a certain area, A filter for determining whether or not the cumulative number has exceeded a predetermined value. Loitering: A filter for determining whether or not an object remains in an area over a predetermined time. (Leave): A filter for determining whether or not there is an object that has entered and does not move within a certain area after a predetermined time. The filter rule switching unit 108 for detecting this generates a switching instruction signal based on the filter processing result notified from the metadata filter unit 106 and notifies the monitoring camera of changes such as switching of the imaging direction. For example, when information indicating blocking of identification information of a certain LED light source is received as metadata, a monitoring camera and LED are referred to by referring to a light source position table in which position information and identification information of a plurality of LED light sources are stored in association with each other. The position of the monitoring target on the detection line connecting the light source is detected, and the camera is made to track the monitoring target. Further, for example, based on the filter processing result obtained from the metadata filter unit 106, a command for switching the operation of the monitoring camera so as to obtain a monitoring video suitable for monitoring is output. Further, the rule switching unit 108 supplies a recording request signal to the video data storage database 104 based on the filter processing result, and stores the video data acquired by the video buffer unit 102 in the video data storage database 104.

  The video data storage database 104 stores video data acquired by the video buffer unit 102. The metadata accumulation database 105 accumulates the metadata acquired by the metadata buffer unit 103.

  The video data processing unit 109 performs processing for causing the display unit 111 to display video data stored in the video data storage database 104. That is, the video data processing unit 109 sequentially reads video data from the playback position designated by the user, and supplies the read video data to the display unit 111. In addition, the video data processing unit 109 supplies the playback position (playback time) of the video data being played back to the playback synchronization unit 112.

  A reproduction synchronization unit 112 that synchronizes reproduction of metadata and video data uses the reproduction position supplied from the video data processing unit 109 and the metadata accumulated in the metadata accumulation database 105 by the metadata processing unit 110. A synchronization control signal is supplied to the metadata processing unit 110 to control the operation of the metadata processing unit 110 so that the playback position at the time of playback is synchronized.

  The metadata processing unit 110 performs processing for causing the display unit 111 to display the metadata stored in the metadata storage database 105. That is, the metadata processing unit 110 sequentially reads metadata from the reproduction position designated by the user, and supplies the read metadata to the display unit 111. When reproducing both video data and metadata, the metadata processing unit 110 controls the reproduction operation based on the synchronization control signal supplied from the reproduction synchronization unit 112 as described above, and converts the video data into the video data. The synchronized metadata is output to the display unit 111.

  The display unit 111 includes live video data supplied from the video buffer unit 102, playback video data supplied from the video data processing unit 109, and live metadata and metadata supplied from the metadata buffer unit 103. The reproduction metadata supplied from the processing unit 110 is displayed. The display unit 111 is based on the filter processing result using one of the monitoring video, the video of the metadata, the video of the filter setting, or the video obtained by combining these based on the filter setting from the metadata filter unit 106. Display (output) video showing the monitoring results. For example, the position of the monitoring target detected based on the metadata is zoomed and displayed.

  In this way, the monitoring system detects that an intruder has entered between the LED light source and the plurality of LED light sources that emit different light signals, a camera having an area sensor that can receive the light signal for each pixel. It is constituted by an information processing device for discrimination. Then, for example, a plurality of LED light sources are installed in the site where the intruder is detected, on the boundary of the site, in the vicinity of the boundary, etc. By determining, it is possible to detect the intrusion or the intrusion position of the object. Moreover, if it installs so that one optical signal may be received with a some sensor, the position of an intruder can be correctly detected based on interruption | blocking of the detection line of each sensor.

  Next, an installation example of the LED light source and the sensor will be specifically described. FIG. 4 is a diagram showing a first specific example of a monitoring system to which the present invention is applied. FIG. 4 is a top view of the site area where intrusion detection is to be performed. Here, the right site boundary line is a monitoring line. The monitoring line is provided with poles at intervals of a distance L, and LED light sources that emit different light signals are installed on the respective poles. The surveillance camera is installed in the vicinity of the lower site boundary, and is installed so as to photograph the surveillance line from an oblique direction. In the figure, the path through which light emitted from each LED light source enters the camera lens is indicated by a dotted line.

  FIG. 5 is a diagram illustrating an example of a captured image of the monitoring camera. As shown in FIG. 5, five LED light sources are installed at equal intervals on each pole installed on the monitoring line, and each LED light source has an ID code 1 to 5 (ID_1 different for each pole). ~ Indicated as ID_5). In this image example, an icon image of an ID code received by the camera is superimposed on the vicinity of the received pixel and displayed on a captured normal moving image. This image can be acquired by an area sensor that receives an optical signal. When the optical signal flashes slowly (about several tens of Hz), the area sensor is operated at a frame rate that is about four times the flashing cycle. Thus, normal image acquisition and optical signal reception can be performed simultaneously. On the other hand, when the flashing of the optical signal is fast (several hundreds of Hz or more), the scanning of image acquisition at several tens of fps and the high-speed sampling scanning at several hundreds of fps are alternately performed, so that the optical signal and the image information are substantially changed. It becomes possible to acquire at the same time.

  In such a monitoring system, the information processing apparatus includes a light source position table that stores, for example, identification information of each LED light source and camera orientation information (rotation angle) as position information of each LED light source in association with each other. Yes.

  Therefore, as shown in FIG. 5, when an intruder enters the site, the intruder blocks the ID code from the LED provided on the pole, so that the camera can detect the intruder. . For example, when an intruder enters between a camera and a pole where an LED light source emitting ID number 3 (ID_3) is installed, the optical signal of the ID_3 code received by the camera is blocked and cannot be received. Therefore, it is possible to detect an intruder. Further, if ID_3 is blocked and ID_2 is continuously received, it is possible to determine that the intruder has passed between pole 2 and pole 3. In this case, as in the example shown in FIG. 5, a warning icon “ID_3 Missing” indicating that ID_3 is shielded is displayed on the captured normal image so that the position of the intruder is displayed to the user. Can be notified. Further, by narrowing the pole installation interval L, the intruder's intrusion position can be specified with high accuracy.

  FIG. 6 is a diagram schematically showing the positional relationship between the LED arrangement on the monitoring line and the camera. In this system, the path (dotted line) through which the LED light enters the camera lens can be substantially regarded as an intruder detection line, and the detection line is set two-dimensionally on the fence surface with one camera. Is possible. Therefore, like an intrusion detection system using a conventional infrared beam, it is possible to prevent an intruder from straddling or passing through a detection line and causing an intruder to leak.

  Moreover, as shown in FIG. 7, it is preferable to install a camera in the vicinity of a site boundary line (monitoring line). That is, it is preferable to arrange a plurality of LED light sources on a line when viewed from above the site, and to install a camera near the line so that the intrusion detection line and the line on which the plurality of LED light sources are arranged are parallel. In other words, the camera is preferably arranged at the apex position of an obtuse angled triangle with the line segment on which the LED light source is arranged as the opposite side. Thereby, since the detection line becomes dense in the vicinity of the monitoring line, it is possible to prevent the detection leak of the intruder.

  FIG. 8 is a diagram showing a second specific example of the monitoring system to which the present invention is applied. In this second specific example, two cameras are prepared (camera 1 and camera 2), and the monitoring line is installed on the right site boundary line. Then, for example, the camera is arranged at a predetermined distance on the side wall of the building in the site, and the monitoring line is set to shoot from different directions. The information processing apparatus also includes a light source position table that stores, for example, identification information of each LED light source and camera orientation information (rotation angle) as position information of each LED light source for each camera.

  When the intruder enters the site and exists at the position shown in FIG. 8, the identification information of ID_3 is blocked by the intruder and cannot be detected by the camera 1. On the other hand, the camera 2 cannot detect the identification information of ID_4. Therefore, the information processing apparatus is present at the intersection of the detection line 1 connecting the camera 1 and the LED light source ID_3 and the detection line 2 connecting the camera 2 and the LED light source ID_4 based on information from these two cameras. I understand. Thus, by using a plurality of cameras and increasing the intersections of the detection lines, it is possible to accurately detect the position where the intruder exists.

  The cameras 1 and 2 preferably have pan, tilt, and zoom functions. Thereby, when the intruder is moving in the site, the information processing apparatus sequentially detects the position of the intruder, moves the line-of-sight direction of the cameras 1 and 2 based on the position, and tracks the intruder. It becomes possible. In this case, the detection line set between the camera and the LED light source does not move even if the camera's line of sight moves due to the camera's pan, tilt and zoom functions, and the LED light source can be distinguished by the ID signal. It becomes. For this reason, accurate position detection can be performed without requiring any calibration.

  In addition, the arrangement of the two cameras can be arbitrarily set as long as the detection lines cross each other. However, the plurality of LED light sources are detected by at least two cameras having different directions and enter between the cameras. Due to the difference in the optical signal that cannot be detected due to the presence of an object, the position of the intruder in the site can be specified. For example, as in the third specific example shown in FIG. 9, if the camera orientation is set to be approximately orthogonal, that is, the detection line connecting the camera and the LED light source is set at a substantially right angle, the detection area in a wide range. Can be set.

  Further, as in the fourth specific example shown in FIG. 10, by arranging a plurality of cameras, it is possible to set a detection area that efficiently covers the entire site area.

  Moreover, in these monitoring systems, since each LED light source (pole) can be distinguished by an ID signal, there is an advantage that the monitoring area can be changed on the camera system at any time by selecting a detection line. For example, the work of finely changing the monitoring area between daytime and nighttime can be automatically performed by changing the registration of the light source position table of the information processing apparatus.

  In addition, in the intrusion detection system, there are cases where it is desired to remove those that are permitted to enter from the detection target. At this time, for example, a person who is allowed to enter must be obliged to wear a batch or armband with an LED light source that emits an ID code indicating that the object is not monitored, and the camera system will be permitted near the place where the intrusion is detected. It is possible to easily distinguish between an intruder and an authorized person by setting a procedure such that a notification is not issued if an ID code is detected. For example, an ID code prohibiting notification is registered in the information processing apparatus in advance, and the intruder is intruded by attaching a batch, an armband, etc. with an LED light source that emits the ID code prohibiting the notification to the intruder. The alarm can be stopped even if it is detected.

  Next, the detection line installed in the height direction will be described with reference to the positional relationship between the camera and the LED light source shown in FIG. FIG. 11A is an example of a side view of detection lines set in the height direction. In this case, if the installation position of the camera is high, there is a blind spot area where a detection line cannot be set as shown in the figure. A technique for avoiding this will be described below.

  In the first method, as shown in FIG. 11B, the camera 2 is similarly installed in the vicinity of the LED light source at the position facing the camera 1, and the LED light source is arranged in the vertical direction on the camera 1 side. At this time, if one of the cameras is installed at a high location, the opposing camera is installed at a low location and is set so as to complement the blind spot area.

  As described above, the camera 1 and the camera 2 are installed facing each other, and further installed at different installation heights, so that the detection blind spot area generated in the vicinity of the camera 1 is compensated by the camera 2, and the camera 2 The camera 1 can compensate for the detected blind spot area that occurs in the vicinity.

  In the second method, as shown in FIG. 11C, another camera 2 is installed below the camera 1 to cover the blind spot area. By installing the cameras at different heights in this way, the blind spot area can be reduced.

  As shown in FIG. 11D, the third method embeds an LED light source in the ground to cover the blind spot area. By installing a plurality of LED light sources that emit optical signals on the bottom surface of the monitoring space in this way, the blind spot area can be covered even if the number of cameras installed is one.

  Moreover, in the specific example mentioned above, in order to simplify description, the LED light sources installed on the same pole emit the same ID code. However, the LED light sources on the same pole also emit different ID codes. Is preferred. Accordingly, the size of the intruder or the intruder can be estimated from the number of LED light sources shielded by the intruder or the intruder.

  For example, as shown in FIG. 12A, if the number of shielded LEDs on one pole is counted, it is possible to detect the vertical size of the intruder. Further, as shown in FIG. 12B, if the interval between adjacent poles is shortened, the size in the horizontal direction can also be detected. Further, as shown in FIG. 12C, if the distance between the vertical and horizontal LED light sources is further shortened, the approximate shape of the object can be estimated.

  In addition, if the distance between the vertical and horizontal LED light sources is shortened, it is possible to distinguish whether the intruder is moving on the ground or flying in the air from the information on the position of the shielding LED. Become. The size, shape, and position estimation of these intruders can make it easy to distinguish humans from animals, floating objects, etc., and can help to avoid false detection in intrusion detection.

  As mentioned above, although an example of embodiment was shown, it is not a thing limited to the above-mentioned embodiment, Various modifications based on the technical idea of this invention are possible. For example, the position of the monitoring target may be detected by configuring the monitoring camera and the optical signal receiving sensor separately.

  For example, when the above-described series of processing is executed by software, a program constituting the software is installed from a network or a recording medium into a computer incorporated in dedicated hardware. Or it installs in a general purpose personal computer etc. which can perform various functions by installing various programs.

  Further, a recording medium including such a program is distributed to provide a program to the user separately from the apparatus main body. For example, a magnetic disk (including a floppy disk) on which a program is recorded, an optical disk (including a compact disk-read only memory (CD-ROM), a DVD (digital versatile disk)), a magneto-optical disk (MD (mini-disk) )), And a removable recording medium (package medium) made of a semiconductor memory or the like. Further, it may be configured by a ROM, a hard disk, or the like that is provided to the user in a state of being pre-installed in the apparatus main body and in which a program is recorded.

  In the present specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in chronological order according to the order, but is not necessarily performed in chronological order, either in parallel or individually. The process to be executed is also included.

It is a block diagram which shows the structural example of a surveillance camera. It is a figure for demonstrating the transmission data from a LED light source. It is a block diagram which shows the structural example of information processing apparatus. It is a figure which shows the 1st specific example of the monitoring system to which this invention is applied. It is a figure which shows the example of a captured image of the monitoring camera. It is a figure which shows typically the positional relationship of LED arrangement | positioning on a monitoring line, and a camera. It is a figure which shows the example which installed the camera in the vicinity of a site boundary line (monitoring line). It is a figure which shows the 2nd specific example of the monitoring system to which this invention is applied. It is a figure which shows the 3rd specific example of the monitoring system to which this invention is applied. It is a figure which shows the 4th specific example of the monitoring system to which this invention is applied. It is a figure for demonstrating the positional relationship of a camera and a LED light source. It is a figure which shows the example of installation of an LED light source. It is a figure which shows an example of the conventional intrusion detection system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Image | video data generation part, 12 Imaging operation switching part, 13 Metadata production | generation part, 21 Lens part, 22 Imaging part, 23 Imaging signal processing part, 24 Data processing part, 101 Network connection part, 102 Video buffer part, 103 Metadata Buffer unit, 104 video data storage database, 105 metadata storage database, 106 metadata filter unit, 107 filter setting database, 108 rule switching unit, 109 video data processing unit, 110 metadata processing unit, 111 display unit, 112 playback synchronization 113, video signal processor

Claims (17)

A plurality of light sources for transmitting identification information by optical signals;
A receiving unit that receives the identification information using an area sensor that receives the optical signal for each pixel;
A monitoring system comprising: a detection unit that detects a blocking of a detection line connecting the area sensor and the light source based on a reception state of the identification information and detects a position of a monitoring target.   The monitoring system according to claim 1, wherein the detection unit detects the position of the monitoring target based on a light receiving pixel position of an optical signal of identification information whose reception is interrupted. A light source position table for storing the plurality of light source position information and identification information in association with each other;
The monitoring system according to claim 1, wherein the detection unit detects the position of the monitoring target on the basis of the identification information that is no longer received and the light source position table. The receiving unit receives the optical signal by a plurality of area sensors,
The monitoring system according to claim 1, wherein the detection unit detects the position of the monitoring target based on a reception state of identification information in each area sensor. An imaging unit having pan, tilt and zoom functions;
The monitoring system according to claim 4, further comprising: a control unit that controls the pan, tilt, and zoom functions based on the position of the monitoring target.   The monitoring system according to claim 5, wherein the imaging unit includes the area sensor and acquires an image using the area sensor.   The monitoring system according to claim 6, wherein the light source emits infrared light or visible light.   The monitoring system according to claim 1, wherein the detection unit detects the size of the monitoring target based on the position of the monitoring target and the number of interruptions of the detection line.   The monitoring system according to claim 1, wherein the detection unit determines a monitoring space based on position information of the plurality of light sources, and issues a report when the monitoring target is detected in the monitoring space. With a light source that transmits information indicating that it is not monitored;
The monitoring system according to claim 9, wherein the detection unit stops the notification when receiving information indicating that the monitoring target is not included.   The monitoring system according to claim 1, wherein the light source is installed on a bottom surface of the monitoring space. The light source is arranged on a straight line when viewed from the upper surface of the monitoring space,
The monitoring system according to claim 1, wherein the area sensor is arranged at a vertex position of an obtuse angled triangle having a line segment on which the light source is arranged as an opposite side.   The monitoring system according to claim 4, wherein the plurality of area sensors are installed at positions where the detection lines are substantially perpendicular.   The monitoring system according to claim 4, wherein the plurality of area sensors are installed at different height positions. A receiving unit that receives identification information of each light source using an area sensor that receives light signals from a plurality of light sources for each pixel;
An information processing apparatus comprising: a detection unit that detects a blocking of a detection line connecting the area sensor and the light source based on a reception state of the identification information and detects a position of a monitoring target. A receiving step of receiving identification information of each light source using an area sensor that receives light signals from a plurality of light sources for each pixel;
An information processing method comprising: a detection step of detecting a block of a detection line connecting the area sensor and the light source based on a reception state of the identification information and detecting a position of a monitoring target. A receiving step of receiving identification information of each light source using an area sensor that receives light signals from a plurality of light sources for each pixel;
A program for causing an information processing device to execute a detection step of detecting a block of a detection line connecting the area sensor and the light source based on a reception state of the identification information and detecting a position of a monitoring target.

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