JP2008136129A - Monitoring camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera monitoring system in which an object to be monitored can be monitored by a monitoring camera without missing its change and a monitor on which a monitoring video image is displayed can also be prevented from being burnt. <P>SOLUTION: A moving object detection processing unit 6 performs detection processing on a mutual relation of a current frame video image A shot by a monitoring camera 1, a former frame video image B and a reference video image C corresponding to an initial picture and only in a case where it is detected that there is no change in the monitoring video image from a result of the moving object detection, a screen saver is initiated for burning prevention. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a monitoring camera system that remotely monitors a monitoring target, and more particularly, to a monitoring camera system including a video receiving apparatus that can perform monitoring without missing a change in the monitoring target and prevent monitor burn-in. .

  In a conventional surveillance camera device, when a fixed image is always displayed on the screen of a display device such as a plasma display, the portion where the luminance of the image is high progresses in deterioration of the phosphor, and there is a luminance difference from the portion where light is not emitted. As a result, a burn-in phenomenon occurs in which a pattern remains on the screen as it is, which makes it difficult to monitor a clear image and requires replacement of the display device.

  In order to reduce such a burn-in phenomenon, for example, in Patent Document 1, the time is always measured from the moment when an operation such as image switching is not performed, and the screen saver is automatically switched to a character or figure after a certain time has elapsed. It has been proposed to prevent burn-in by moving and displaying on the screen.

JP 2003-150140 A Japanese Patent Application Laid-Open No. 2005-094791

  However, the burn-in prevention function of the display device in the conventional surveillance camera device proposed in Patent Document 1 described above is a configuration in which a screen saver is automatically activated by timer control. For this reason, there is a problem that the monitoring target cannot be confirmed even when a change occurs in the monitoring video while the screen saver is displayed.

  Therefore, the present invention is to provide a camera monitoring system including a video reception device that can perform monitoring without missing a change in the monitoring target and prevents the monitor from being burned.

In order to solve the above problems, the present invention provides a camera that captures a monitoring target, a video receiving device that receives the video of the monitoring target acquired by the camera, a display device that displays the received video, and the display In a surveillance camera system comprising a screen saver for preventing device burn-in,
The video receiving device includes a moving object detection processing unit that detects a change in the received received video image to be monitored, and the screen saver is detected only when the moving object detection processing unit detects that the monitoring target has not changed. It is characterized by starting.

  The monitoring camera system may be configured to detect an abnormal shooting state by adding an initial image in a state where there is no change in the monitoring target to the detection processing algorithm.

  According to the present invention, the video captured by the surveillance camera is subjected to the motion detection process, and the screen saver for preventing the burn-in is activated only when there is no change in the surveillance video. However, the problem that the monitoring target cannot be confirmed and the burn-in phenomenon can be solved by the screen saver. Therefore, in the camera monitoring system, it is possible to realize a configuration in which the monitor burn-in prevention is automatically controlled and a change in the monitoring target is not missed.

  An embodiment according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a configuration of a camera monitoring system according to the present invention. The monitoring system of this embodiment includes a monitoring camera 1, a video reception device 2, and a monitor 3. The video receiver 2 includes a frame memory 4, a reference image output device 5, a moving object detection processing unit 6, a dummy screen output device 7, and a video changeover switch SW1. An example of the monitoring operation performed by the camera monitoring system configured as described above will be described.

  First, the monitoring camera video A output from the monitoring camera 1 is input to the video receiving device 2. Inside the video reception device 2, the monitoring camera video A is input to the moving object detection processing unit 6, the frame memory 4, and the reference image output device 5. The frame memory 4 records the input surveillance camera video A and holds it until the next frame is input.

  The frame memory 4 may hold any number of frames as long as the memory capacity is not limited, and the number of recordings differs depending on what kind of moving object detection algorithm is used in the moving object detection processing unit 6 described later. In the reference image output device 5, as an initial screen, an image having no problem in the monitoring area captured by the monitoring camera 1 is recorded. The moving object detection processing unit 6 performs a moving object detection process from difference information between the monitoring camera image A and the previous frame image B output from the frame memory 4.

In the moving object detection processing here, various algorithms can be applied. For example, as a basic algorithm, a method of detecting a moving object from a difference in luminance values of two or more video frames is known. . (For example, see Patent Document 2)
Here, a case where a change has occurred in the monitoring camera image A as a result of the moving object detection processing by the moving object detection processing unit 6 will be described. As described above, determining that there is a change depends on the moving object detection algorithm of the moving object detection processing unit 6. When it is determined that there is a change due to the moving object detection process, the moving object detection processing unit 6 does not output the output video control signal F or the monitor control signal G, and waits until the next frame of the monitoring camera video is input. When the video switch SW1 does not receive the output video control signal F, the monitoring camera video A is output to the monitor 3 as the monitor output video signal E.

  Next, a case where there is no change in the video of the monitoring camera video A as a result of the motion detection processing performed by the motion detection processing unit 6 will be described.

  As described above, determining that there is no change depends on the moving object detection algorithm of the moving object detection processing unit 6.

  In this embodiment, not only the correlation between the monitoring camera image A corresponding to the current frame and the previous frame image B corresponding to the past frame, but also the correlation between the reference image C corresponding to the initial screen is detected as a moving object. Incorporate into the algorithm. This is because even when the monitoring camera 1 is malfunctioned or when the monitoring camera image A is artificially crafted (for example, the camera is covered with a cloth, etc.), an image different from the monitoring area to be originally photographed is transmitted. This is to recognize this as a change.

  When no change is detected in the monitoring target in the detection process of the moving object detection processing unit 6, the moving object detection processing unit 6 outputs the output video control signal F to the video changeover switch SW1, or monitors the monitor control signal G on the monitor 3 Output to. The video changeover switch SW1 that has received the output video control signal F switches the connection to the dummy screen output device 7, and outputs the dummy screen D that is the output of the dummy screen output device 7 to the monitor 3 as the monitor output video signal E. . The monitor 3 that has received the monitor control signal G switches the power source of the monitor 3 to the power saving mode. Here, the dummy screen D is a still image, a screen saver image, or a moving image that hardly causes the burn-in of the monitor, and is stored in the dummy screen output device 7 in advance when the system is activated.

  In this embodiment, a plurality of videos received from a plurality of monitoring cameras are divided and displayed on a monitor on one monitor. Here, as shown in FIG. 2, it is assumed that four surveillance cameras 1a to 1d are installed. The basic configuration is the same as that in FIG. 1, but a camera selection switch SW <b> 2 is provided for switching the images of the four surveillance cameras and inputting them to the video receiver 2.

  Next, the operation of the surveillance camera system of this embodiment will be described. For example, the surveillance cameras are sequentially switched to 1a, 1b, 1c, and 1d by the surveillance camera selection switch SW2, and the surveillance camera video A from each surveillance camera is input to the video reception device 2 and is divided and displayed on the screen of the monitor 3. . Inside the video reception device 2, the video A of each surveillance camera is sequentially input to the moving object detection processing unit 6, the frame memory 4, and the reference image output device 5. At this time, in the frame memory 4, each inputted surveillance camera video A is recorded for each surveillance camera, and held until each next frame from each surveillance camera is inputted. Also in this embodiment, the frame memory 4 can hold any number of frames as long as the memory capacity is not limited.

  In the reference image output device 5, as an initial screen, an image in which there is no problem in the monitoring area captured by each monitoring camera is recorded for each monitoring camera. The moving object detection processing unit 6 uses the difference information between the monitoring camera video A from each monitoring camera and the previous frame video B corresponding to each monitoring camera output from the frame memory 4 held for each monitoring camera. The moving object detection process is sequentially performed for each video. Here, as a result of the moving object detection processing by the moving object detection processing unit 6, for example, it is assumed that there are changes in the monitoring cameras 1a and 1b and there are no changes in the monitoring cameras 1c and 1d.

  In the case of the monitoring cameras 1a and 1b determined to have a change by the moving object detection processing, the moving object detection processing unit 6 does not output the output video control signal F and the monitor control signal G, and each of the monitoring cameras 1a and 1b. Wait until the next frame of video is input. When the video switch SW1 does not receive the output video control signal F, the video camera A is output to the monitor 3. Accordingly, the monitoring camera images A of the monitoring cameras 1 a and 1 b are output to the monitor 3.

  On the other hand, in the case of the monitoring cameras 1c and 1d that are determined to have no change by the moving body detection processing of the moving body detection processing unit 6, the output video control signal F is output to the video changeover switch SW1, or the monitor control signal G Is output to the monitor 3. The video switch SW1 that has received the output video control signal F switches the connection and outputs the output dummy screen D from the dummy screen output device to the monitor 3. As in the first embodiment, the dummy screen D is a still image, screen saver image, or moving image that is unlikely to cause burn-in on the monitor, and is stored in the dummy screen output device 7 in advance when the system is activated. The monitor 3 that is receiving the monitor control signal G and is displaying the split screen switches the power source of the monitor 3 to the power saving mode and does not display the video of the video signal from the monitoring cameras 1c and 1d that do not detect the change on the split screen. .

  Even in this embodiment, when a monitoring camera malfunctions or the monitoring camera video A is artificially crafted, even when an image different from the monitoring area to be photographed is transmitted, this is recognized as a change. Therefore, not only the correlation between the video A of each surveillance camera corresponding to the current frame and the previous frame video B corresponding to the past frame, but also the correlation with the reference video C corresponding to the initial screen is a moving object. Incorporate into the detection algorithm.

  The preferred embodiments of the camera monitoring system according to the present invention have been described above, but it goes without saying that various design changes can be made without departing from the spirit of the present invention. For example, in the second embodiment, a plurality of monitoring cameras are described as being sequentially switched. However, the monitoring cameras may be switched in any order, and may be arbitrarily switched by an operator who monitors the monitor. Of course, the number of surveillance cameras is not limited to four.

The block diagram which shows the structure of one Example of the monitoring system which concerns on this invention. The block diagram which shows the structure of another Example of the monitoring system which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a-1d ... Surveillance camera, 2 ... Image | video receiving apparatus, 3 ... Monitor, 4 ... Frame memory, 5 ... Reference image output device, 6 ... Moving body detection process part, 7 ... Dummy screen output device, A ... Surveillance camera image , B ... previous frame video, C ... reference video, D ... dummy screen video, E ... monitor output video, SW1 ... video switch, SW2 ... surveillance camera video switch, F ... output video control signal, G ... monitor control signal .

Claims (1)

A camera that shoots the monitored object;
A video receiving device for receiving the video to be monitored acquired by the camera;
A display device for displaying the received video;
In a surveillance camera system comprising a screen saver for preventing burn-in of the display device,
The video receiving device includes a moving object detection processing unit that detects a change in the received received video to be monitored.
The camera monitoring system, wherein the screen saver is activated only when the moving object detection processing unit detects that there is no change in the monitoring target.

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