JP2010278749A - Recorder and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recorder and recording method for enabling the recorder side to easily acquire coordinates information of a person detection area even in an analog type camera. <P>SOLUTION: A video signal processing part 31 of the recorder 3 calculates a difference between an odd field and an even field of a video signal from a camera 2 to determine the existence/absence of a frame. If the difference obtained by the calculation is less than a predetermined threshold, it is determined that the frame does not exist, and the odd field is encoded, subsequently transferred to a file system 33 and recorded in a recording part 34. Also, the even field is transferred to a video outputting part 32 to display live video on a monitor 4. On the other hand, if the difference is equal to or greater than the predetermined threshold, it is determined that the frame exists, and the coordinates of a vertex of a rectangle are calculated from coordinates that are equal to or greater than the predetermined threshold. After the odd field is encoded, the encoded odd field is transferred together with frame coordinates information to the file system 33 and recorded in the recording part 34. Moreover, the even field is transferred to the video outputting part 32 to display live video on the monitor 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording apparatus and a recording method suitable for use in a monitoring system.

  The monitoring system generally includes a plurality of cameras, a recording device that records video from each of the plurality of cameras, and a monitor that displays video from each camera and video recorded on the recording device ( For example, see Patent Document 1).

  There are analog and digital cameras used in the surveillance system. In an analog camera, when a person is detected, alarm bits are multiplexed and transmitted to a recording apparatus during a blanking period of a video signal. When the recording device receives the video signal from the camera, the recording device detects an alarm bit multiplexed in the video signal, and performs operations such as starting recording.

JP 2000-059759 A

  However, the conventional recording device can acquire alarm information only with the alarm bit sent from the camera, and in order to acquire the information of the coordinates of the area where the person is detected, the camera is inquired about the information. I had to.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording apparatus and a recording method capable of easily obtaining coordinate information of a person detection area on the recording apparatus side even with an analog camera. And

  The recording apparatus of the present invention takes a difference between a first image including a moving subject and a frame surrounding the moving subject and a second image including the moving subject, and coordinates the frame. Frame coordinate information acquisition means for acquiring frame coordinate information indicating the above and recording means for recording the frame coordinate information acquired by the frame coordinate information acquisition means in association with the second image.

  According to the above configuration, since the difference between the first image including the frame surrounding the moving subject and the second image including the moving subject is taken, frame coordinate information indicating the frame coordinates is acquired. If the first image including the frame surrounding the moving subject and the second image including the moving subject are obtained from the camera, the coordinate information of the person detection area is easily acquired on the recording device side. be able to. In other words, since it is possible for an analog camera to generate an image including a frame surrounding a moving subject, the recording apparatus can easily acquire the coordinate information of the person detection area even with an analog camera. Can do.

  In the above configuration, it is preferable that the frame is added to the moving subject when an alarm is generated.

  In the above configuration, it is preferable that the first image is an even field image and the second image is an odd field image.

  The recording system of the present invention includes a camera that generates and outputs the first image and the second image, and the recording device.

  In the above-described configuration, since the camera that generates the first image including the frame surrounding the moving subject and the second image including the moving subject, the coordinates of the person detection area can be easily obtained on the recording device side. Information can be acquired.

  The recording method of the present invention takes a difference between a first image including a moving subject and a frame surrounding the moving subject and a second image including the moving subject, and coordinates the frame. A frame coordinate information acquisition step for acquiring frame coordinate information indicating the above, and a recording step for recording the frame coordinate information acquired in the frame coordinate information acquisition step in association with the second image.

  According to the above method, since the difference between the first image including the frame surrounding the moving subject and the second image including the moving subject is obtained, frame coordinate information indicating the coordinates of the frame is acquired. If the first image including the frame surrounding the moving subject and the second image including the moving subject are obtained from the camera, the coordinate information of the person detection area is easily acquired on the recording device side. be able to. In other words, since it is possible for an analog camera to generate an image including a frame surrounding a moving subject, the recording apparatus can easily acquire the coordinate information of the person detection area even with an analog camera. Can do.

  Since the present invention takes a difference between a first image including a frame surrounding a moving subject and a second image including a moving subject, and acquires frame coordinate information indicating the coordinates of the frame. If the first image including the frame surrounding the moving subject and the second image including the moving subject are obtained, the coordinate information of the person detection area can be easily acquired on the recording device side. it can.

The block diagram which shows schematic structure of the monitoring system which concerns on one embodiment of this invention The block diagram which shows schematic structure of each of the camera and recording apparatus which are shown in FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a monitoring system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a schematic configuration of each of the camera and the recording device of the monitoring system according to the present embodiment.

  In FIG. 1, a monitoring system 1 according to the present embodiment includes a camera 2, a recording device 3, and a monitor 4. As shown in FIG. 2, the camera 2 includes an image sensor 21 such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and a video that performs predetermined processing on a video signal output from the image sensor 21. And a signal processing unit 22. The video signal processing unit 22 compares frames sequentially output from the image sensor 21 for each specified number of frames, and detects a change in the presence of a subject. Then, a frame (alarm detection frame) is placed on the video of the even field with a rectangle surrounding the portion where the subject is detected, and the video is output. In other words, the video signal processing unit 22 outputs an image (first image) including a moving subject and a frame surrounding the subject as an even field, and an image (second image) including the moving subject. Output as an odd field. Note that the video signal processing unit 22 may multiplex alarm bits during the blanking period of the video signal when a person is detected, as in a conventional analog camera.

  As shown in FIG. 2, the recording device 3 includes a video signal processing unit 31, a video output unit 32, a file system 33, a recording unit 34, a CPU (Central Processing Unit) 35, and an alarm output unit 36. Prepare. The video signal processing unit 31 calculates the difference (for example, luminance difference) between the odd field and the even field for the video signal sent from the camera 2 and determines the presence or absence of a frame. If the difference obtained by the calculation is less than a predetermined threshold value, it is determined that there is no frame, the odd field is encoded, and then transferred to the file system 33 together with the date / time information and the channel information. Further, the even field is transferred to the video output unit 32. On the other hand, if the difference obtained by the calculation is equal to or greater than a predetermined threshold, it is determined that there is a frame (the alarm is detected by the camera 2), and rectangular vertex coordinates are obtained from the coordinates equal to or greater than the predetermined threshold. Then, after encoding the odd field, it is transferred to the file system 33 together with the frame coordinate information, date / time information and channel information. Further, the even field is transferred to the video output unit 32. Further, alarm information is generated and transferred to the CPU 35.

  The video output unit 32 displays the live video on the monitor 4 by receiving the even field sent from the video signal processing unit 31. The file system 33 receives the video data, frame coordinate information, date / time information, and channel information sent from the video signal processing unit 31 and stores them in the recording unit 34. For the recording unit 34, for example, an HDD (Hard Disk Drive) is used. When receiving the alarm information sent from the video signal processing unit 31, the CPU 35 sends it to the alarm output unit 36. In addition, when receiving a search instruction such as a controller remote command from the outside, the CPU 35 performs a search using the file system 33 and sends the corresponding data to the video output unit 32 if there is such data. When alarm information is sent from the CPU 35, the alarm output unit 36 performs an alarm operation such as sounding a buzzer.

  The diagram shown within the dotted line in FIG. 1 schematically shows the main operation of the recording apparatus 3. An even field and an odd field are sent from the camera 2. If a frame cannot be obtained by taking the difference between the even field and the odd field, the odd field is encoded and transferred to the file system 33 together with date / time information and channel information and recorded in the recording unit 34. Transfer to the video output unit 32. When the frame is obtained, the odd field is encoded, transferred to the file system 33 together with the frame coordinate information, date / time information, and channel information and recorded in the recording unit 34, and the even field is transferred to the video output unit 32. .

Next, operation | movement of the monitoring system 1 of this Embodiment is demonstrated.
(When recording)
(1) The subject is captured by the image sensor 21 of the camera 2.
(2) The video signal processing unit 22 of the camera 2 compares the frames captured by the image sensor 21 of the camera 2 for each specified number, and detects a change in the subject.
(3) The video signal processing unit 22 of the camera 2 outputs a video by placing a frame on the video of the even field with a rectangle surrounding the detected portion.

  (4) The video signal processing unit 31 of the recording device 3 calculates the difference (luminance difference) between the even field and the odd field of the received frame. If the difference is less than the predetermined threshold, the odd field is encoded and transferred to the file system 33 together with the date / time information and the channel information and recorded in the recording unit 34. Further, the even field is transferred to the video output unit 32 and the live video is displayed on the monitor 4. On the other hand, if the difference is greater than or equal to a predetermined threshold, it is determined that a frame is drawn (the camera 2 has detected an alarm). Then, the vertex coordinates of the rectangle are obtained from the coordinates equal to or greater than a predetermined threshold. Thereafter, the odd field is encoded, transferred to the file system 33 together with the coordinate information, date / time information, and channel information, and recorded in the recording unit 34. Further, the even field is transferred to the video output unit 32 and the live video is displayed on the monitor 4. Also, alarm information is transmitted to the CPU 35. The CPU 35 sends alarm information to the alarm output unit 36 to cause an alarm operation such as a buzzer sound.

  Note that the recording apparatus 3 does not put a frame on the even field video in the above (3) but outputs a video only with the frame on the blank video (black picture) as an even field. No calculation is required. Since the coordinate calculation at that time does not depend on the image of the subject (only a coordinate having a luminance other than black is obtained), erroneous detection is eliminated. In the case of this method, the recording device 3 detects which alarm the camera 2 detects from the luminance value by distinguishing the luminance of the frame by the difference in detection mode (intrusion detection, stay detection, etc.) on the camera 2 side. Can know.

(Search / playback)
A user designates a search condition for the recording apparatus 3 by a menu operation of the recording apparatus 3 or an external command transmission. The CPU 35 of the recording device 3 searches for applicable data based on coordinate information managed by the file system 33 if coordinates are specified in the search condition. If there is corresponding data, the data is transferred from the recording unit 34 to the video output unit 32 via the file system 33 and output to the monitor 4. In addition, an image with no frame multiplexed is recorded on the recording device 3, but in the case of reproduction, an image recorded on the video output unit 32 based on the coordinate information recorded on the recording device 3. A frame may be drawn and multiplexed, and the presence or absence of the frame display can be selected as necessary. On the other hand, since the framed image is displayed on the monitor 4, the cause of the alarm can be easily grasped.

  As described above, according to the monitoring system 1 of the present embodiment, the camera 2 outputs an image including a moving subject and a frame surrounding the subject as an even field, and an image including the moving subject is an odd field. And the recording apparatus 3 calculates frame difference information indicating the coordinates of the frame by taking the difference between the moving subject and the image including the frame surrounding the moving subject and the image including the moving subject. Since the acquired frame coordinate information is recorded in association with an image including a moving subject, the analog camera 2 can easily acquire the coordinate information of the person detection area on the recording device 3 side.

  INDUSTRIAL APPLICABILITY The present invention has an effect that the coordinate information of the person detection area can be easily acquired on the recording apparatus side even with an analog camera, and can be applied to a monitoring system employing an analog camera. is there.

DESCRIPTION OF SYMBOLS 1 Monitoring system 2 Camera 3 Recording apparatus 4 Monitor 21 Image sensor 22, 31 Video signal processing part 32 Video output part 33 File system 34 Recording part 35 CPU
36 Alarm output section

Claims (5)

The frame coordinate information indicating the coordinates of the frame is obtained by taking the difference between the first image including the moving subject and the frame surrounding the moving subject and the second image including the moving subject. Frame coordinate information acquisition means to perform,
Recording means for recording the frame coordinate information acquired by the frame coordinate information acquisition means in association with the second image;
Recording device.   The recording apparatus according to claim 1, wherein the frame is given to the moving subject when an alarm occurs.   The recording apparatus according to claim 1, wherein the first image is an even field image, and the second image is an odd field image. A camera that generates and outputs the first image and the second image;
A recording apparatus according to any one of claims 1 to 3,
Recording system equipped with. The frame coordinate information indicating the coordinates of the frame is obtained by taking the difference between the first image including the moving subject and the frame surrounding the moving subject and the second image including the moving subject. Frame coordinate information acquisition step to perform,
A recording step of recording the frame coordinate information acquired in the frame coordinate information acquisition step in association with the second image;
Recording method.

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