JP2000050237A - Video monitor system and video monitor method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video monitor system where plural designated sites to be monitored are monitored by a single monitor camera and only the image of a monitor place required by the user itself is displayed. SOLUTION: A monitor camera 1 is installed by interposing a camera base 5 to vary a photographing range. Since an image recorder 3 records an identification code 11 obtd. by coding instruction information of a photographing range instruction section 8 for instructing the photographing range in relation to a video image of the monitor camera, the identification code 11 extracted at the reproduction time is used to display only an image of a monitor place required by the user itself.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video surveillance system having a surveillance camera and an image recording device for recording an image of the surveillance camera.

[0002]

2. Description of the Related Art This type of apparatus is configured as shown in FIG. 10 (a) or (b). A plurality of surveillance cameras 11 _{1 to 1} n, a video output of the surveillance cameras 11 1 to ₁ n connected to an input side, a frame switcher 2 for sequentially switching predetermined frames and outputting to an output side, and the surveillance output from the frame switcher 2 time-lapse video tape recorder 3 to record the video signal of the camera 1 ₁ 1n (hereinafter, referred to as time lapse VTR) and, and a monitor 4 which is connected to the frame switcher 2 displays a playback signal of the time-lapse VTR3 . Frame switcher 2 is sending a video signal to the time lapse VTR3 Following camera number information specifying the surveillance camera 1 ₁ 1n.

[0003] The video surveillance system shown in FIG. 10 (b) is installed by mounting a single surveillance camera 1 on a motorized camera stand 5, and taking pictures of the surveillance camera 1 based on instruction information 7 from a console 6. The direction is remotely controlled, the video signal of the monitoring camera 1 is recorded by the time-lapse VTR 3, and the reproduction signal of the time-lapse VTR 3 is displayed on the monitor 4.

[0004]

The video surveillance system shown in FIG. 10A requires a plurality of surveillance cameras.
The video surveillance system shown in FIG.
Can monitor a plurality of monitoring locations specified by.

However, in the video surveillance system shown in FIG. 10 (b), only the reproduction screen is displayed on the monitor 4 in the order of recording, and it is necessary for the user himself to select and watch an image of a necessary monitoring place. is there.

[0006] The present invention is a video surveillance system which can monitor a plurality of surveillance locations designated by a single surveillance camera and can display only images of the surveillance locations required by the user himself. The purpose is to provide.

[0007]

A video surveillance system according to the present invention is constructed so that a photographing range of a surveillance camera can be changed, and at the same time, the instruction information for instructing the surveillance camera on the photographing range is encoded and associated with the video. The image recording apparatus is configured to record.

According to the present invention, a plurality of monitoring locations designated by a single monitoring camera can be monitored, and the user himself / herself needs the information by using the instruction information recorded at the time of recording at the time of reproduction. Only images of the monitoring location can be displayed.

[0009]

According to a first aspect of the present invention, there is provided a video surveillance system having a surveillance camera and an image recording device for recording an image of the surveillance camera, wherein a shooting range of the surveillance camera can be changed. In addition, the image recording apparatus is configured to encode instruction information of an imaging range instructing unit that instructs a monitoring camera to specify an imaging range, and record the information in association with the video.

According to a second aspect of the present invention, in the video surveillance system according to the first aspect, the image recording apparatus records the instruction information of the photographing range instruction unit on a single scan line or a plurality of scan lines of the video signal. It is characterized by.

A third aspect of the present invention is the video surveillance system according to the second aspect, wherein the image recording apparatus records an identification code corresponding to a shooting direction and an angle of view of the surveillance camera at each time.

According to a fourth aspect of the present invention, when the image recording apparatus records and monitors the image of the surveillance camera,
At the time of recording, the image recording apparatus encodes shooting range instruction information for instructing a monitoring range to the surveillance camera, records the information in association with the video, and at the time of reproduction, detects the shooting range instruction information multiplexed on the video and designates reproduction. Only videos that meet the specified conditions are selected and displayed on the display.

According to a fifth aspect of the present invention, there is provided a video monitoring method according to the fourth aspect.
At the time of playback, the camera detects the shooting range instruction information multiplexed on the video, selects only the video that meets the conditions specified for playback, and performs motion detection with the currently displayed screen, causing the screen to blur. The display is characterized in that the image is displayed after blur correction so that the image is reduced.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
It will be described based on. (Embodiment 1) FIGS. 1 and 2 show (Embodiment 1).

As shown in FIGS. 2A and 2B, the surveillance camera 1 is installed via a camera base 5 so as to be able to change its attitude in the horizontal direction (the direction of arrow H). The surveillance camera 1 also includes an electric zoom lens 6 that can electrically switch the angle of view between wide, standard, and telephoto.

The photographing range instruction information 7 for operating the camera base 5 and the electric zoom lens 6 is given from the photographing range instruction unit 8, and even a single surveillance camera 1 is based on the instruction from the photographing range instruction unit 8. You can shoot multiple monitoring locations.

The video signal 9 of the surveillance camera 1 from time to time is recorded in a time lapse VTR 3. In addition, time lapse VT
At the time of recording R3, the above-mentioned photographing range instruction information 7 is converted into an identification code 11 by an encoding unit 10 and is recorded on a recording tape by a time lapse VTR 3 together with the video signal 9 at that time.

With this configuration, the photographing range instructing unit 8 is operated in real time by an attendant to change and monitor at least one of the monitoring location and the angle of view, or to change the monitoring location and the angle of view from time to time. By monitoring the program by setting the program in the photographing range instructing section 8 in advance, a single monitoring camera 1 can monitor a plurality of monitoring locations.

In addition, the recording tape recorded by the time-lapse VTR 3 records the occasional video signal and the identification code 11 indicating the shooting range. Therefore, at the time of reproduction, the reproduced identification code 11 and the target monitoring location are recorded. By comparing with the identification code corresponding to the target, and reproducing only the video signal that matches the identification code corresponding to the target monitoring location and displaying it on the display, the user can obtain only the necessary images from the image displayed on the display. This eliminates the need for the user to select and view the image, thereby improving usability.

(Embodiment 2) FIGS. 3 to 6 show (Embodiment 2). It is to be noted that components having the same functions as those of the first embodiment shown in FIG.

As shown in FIG. 3 (Embodiment 2),
The video signal 9 photographed based on the photographing range instruction information 7 of the photographing range instruction unit 8 is transmitted to the time lapse V
Recorded in TR3.

In the multiplexing section 12, each bit of the identification code 11 encoded by the encoding section 10 is converted into the video signal 9 at a specific timing in accordance with the synchronization signal 14 extracted from the video signal 9 by the synchronization detection section 13. Superimposed.

Specifically, FIG. 4A shows a plurality of surveillance locations and the positions of the surveillance cameras 1 installed there. As a surveillance place, the direction seen from surveillance camera 1 is
Eight passages: the entire passage in (Direction 1), the distant passage, the entrance in (Direction 2), the entire building, the parking lot in (Direction 3), the parking lot near, and the main gate in (Direction 4), the main gate expansion In this case, the angle of view of the electric zoom lens 6 for each monitoring location is determined to be one of wide, standard, and telephoto as shown in FIG.

Therefore, in this embodiment, when a monitoring place (entire passage) is designated by the photographing range instructing section 8, FIG.
As shown in (b), the camera base 5 rotates in the (direction 1), and the electric zoom lens 6 switches to (standard).

Similarly, when a surveillance place (far from the passage) is designated, the camera base 5 rotates in the (direction 1) and the electric zoom lens 6 switches to (telephoto). Monitoring place (entrance)
Is designated, the camera base 5 rotates in the (direction 2) and the electric zoom lens 6 switches to (telephoto).

When the surveillance place (entire building) is designated, the camera base 5 rotates in the (direction 2) and the electric zoom lens 6 is switched to (wide). When a monitoring place (far from the parking lot) is designated, the camera base 5 rotates in the (direction 3) and the electric zoom lens 6 switches to (telephoto).

When a monitoring place (near a parking lot) is designated, the camera base 5 rotates in the (direction 3) and the electric zoom lens 6 is switched to (standard). When the surveillance place (the main gate) is designated, the camera base 5 rotates in the (direction 4), and the electric zoom lens 6 switches to (standard).

When a surveillance place (enlargement of the front gate) is designated, the camera base 5 rotates in the (direction 4) and the electric zoom lens 6 switches to (telephoto). As shown in FIG.
When the monitoring place (entire passage) is designated as shown in FIG. 4B, a 4-bit identification code representing "0" is generated as the photographing range designation information.

When a surveillance place (far from the passage) is designated, a 4-bit identification code representing "1" is generated as photographing range designation information. When a monitoring place (entrance) is designated, a 4-bit identification code representing "2" is generated as the photographing range designation information.

When a monitoring place (entire building) is designated, a 4-bit identification code representing "3" is generated as photographing range designation information. When the monitoring place (far from the parking lot) is designated, a 4-bit identification code representing "4" is generated as the photographing range designation information.

When a monitoring place (near a parking lot) is designated, a 4-bit identification code representing "5" is generated as photographing range designation information. When the monitoring location (the main gate) is designated, a 4-bit identification code representing "6" is generated as the photographing range designation information.

When a monitoring location (enlargement of the front gate) is designated, a 4-bit identification code representing "7" is generated as photographing range designation information. FIGS. 5B and 5D show the operation of the multiplex position specifying unit 16 and the multiplex unit 12. FIG. 5A, which is shown for comparison, shows an image of the (n−1) th line, the nth line, and the (n + 1) th line to the time lapse VTR 3 when the multiplexing unit 12 does not multiplex the identification code 11. 5 indicates a "0" as shown in FIG. 5B when a monitoring place (entire passage) is designated by the photographing range instruction unit 8.
A bit identification code (0000) is superimposed on the nth line following the start bit S.

When a monitoring place (near a parking lot) is designated by the photographing range instructing section 8, "5" is displayed as shown in FIG.
Is superimposed on the n-th line in order from the upper bit following the start bit S.

Monitoring area (enlarged front view) by the photographing range instruction unit 8
Is designated, as shown in FIG. 5D, a 4-bit identification code (0111) representing "7" is superimposed on the n-th line in order from the upper bits following the start bit S.

In other cases, similarly, 4 representing the photographing range is used.
The bit identification code is superimposed on the n-th line of the video signal in order from the upper bit following the start bit S. FIG.
Represents a processing system of the reproduced video signal 17 obtained by performing the reproducing operation of the time lapse VTR 3 in which the photographing range designation information is recorded in association with the video signal as described above.

The display means 18 comprises a display buffer 19, a display 20, and a comparison unit 22 which outputs a freeze instruction 21 for instructing the display buffer 19 to update stored contents.

The display means 18 displays the reproduced video signal 17,
The reproduction designation identification code 23 for the purpose of reproduction and the identification code 11 detected from the occasionally reproduced video signal 17 are inputted, and the comparing section 22 of the display means 18 makes the identification code 11 If they match, the freeze instruction 21 is released, the content stored in the display buffer 19 is updated to the latest reproduced video signal 17, and the latest image is displayed on the display 20. Identification code 11 and reproduction designation identification code 23
The comparison unit 22 outputs a freeze instruction 21 to the display buffer 19 when the display
Is configured to hold and display the immediately preceding display screen until the next time the identification code 11 and the reproduction designation identification code 23 match.

The part for detecting the identification code 11 from the reproduced video signal 17 is composed of a synchronization detecting part 24, a sampling timing generating part 25, a comparator 26 and a quantizing part 27, and FIG. I have.

The synchronization detector 24 and the sampling timing generator 25 create a sampling signal 28 for designating the period of the n-th line of the reproduced video signal 17. FIG. 7 shows a case where the content of the reproduced video signal 17 is a monitoring place (magnified from the front), and a 4-bit identification code (0111) representing “7” is superimposed on the n-th line in order from the upper bit following the start bit S. It represents the state that is performed. A signal obtained by comparing the reproduced video signal 17 with the level Vref is output to the output of the comparator 26, and the quantizing unit 27 outputs the start bit S after a specified time T1 from the edge of the synchronization signal 29.
Is confirmed, the identification code 11 is obtained by sampling four points at intervals of ΔT.

In this case, the reproduction designation identification code 2
When 3 is the identification code 11 (0111), the display image of the reproduced video signal 17 at that time is displayed as the latest screen.

The sampling in the quantization unit 27 is performed as follows.
Instead of one sampling per point as described above, a plurality of samplings per point may be executed, and the final sampling result may be determined by majority decision.

In the above-described embodiment, at the time of recording, the designated information of the shooting range at that time is multiplexed on the n-th line of the video signal 9, and specifically, the video signal 9 of the monitoring place (magnified frontal view) is multiplexed.
In the n-th line, the designation information “7” of the shooting range at that time
The switching control can be favorably performed by multiplexing the information for specifying the imaging range of the next monitoring location in a predetermined frame (for example, one frame before) for switching the monitoring location.

(Embodiment 3) FIGS. 8 and 9 show (Embodiment 3). Note that components having the same functions as those shown in FIGS. 3 to 7 (Embodiment 2) are given the same reference numerals and described.

FIG. 8 shows a reproduction system of the video surveillance system of the third embodiment. The reproduction system of the second embodiment shown in FIG. The difference is that 30 is interposed. The recording system is the same as that of the second embodiment.

In this video surveillance system, the surveillance camera 1 is installed via a camera stand 5 as shown in FIG. 3, and the camera stand 5 is rotated to the surveillance place by the designation of the surveillance place from the photographing range instruction unit 8. .

Here, mechanical backlash of the camera base 5 becomes a problem. The problem will be described with a specific example, and the display correction unit 30 capable of avoiding the problem will be described.
Will be described.

Here, a specific surveillance location is designated by the photographing range instructing section 8, and at time T1, the camera base 5 is turned to the surveillance camera 1 at the designated surveillance location, and then another surveillance location is designated. The following description is made on the assumption that the camera base 5 is moved and then the specific monitoring place is specified again, and the monitoring camera 1 is stopped at the time T2 with the camera base 5 directed to the specified monitoring place. .

First, a case where the display correction section 30 is not provided will be described. FIG. 9A shows a video signal 9 of the surveillance camera 1 which has photographed the photographing range designated by the same surveillance place designation identification code.
Are recorded by the time lapse VTR 3 and the reproduced image at the recording time T1 and the reproduced image at the recording time T2 displayed on the display 20 by being specified by the reproduction specifying identification code in the reproducing system. When the reproduced image at the recording time T1 is displayed on the display 20 and then the reproduced image at the recording time T2 is displayed, as shown in FIG. It is displayed and is hard to see.

In this example, the building 31 of the reproduced image at the recording time T1 is x1 in the horizontal direction and y1 in the vertical direction from the edge of the screen.
The building 31 of the reproduced image at the recording time T2 is shifted from the edge of the screen to the position of x2 in the horizontal direction and to the position of y2 in the vertical direction due to mechanical shake of the camera stand 5 or the like. Have been.

The display correction unit 30 provided in this (Embodiment 3) detects the direction of movement of the monitoring video whose photographing direction has slightly changed, and displays the surveillance video by subtracting the movement. Image processing is performed so that a stationary object is displayed on the screen of the display 20 in a stationary state without displacement.

In this example, the building 31 of the reproduced image at the recording time T2 has a horizontal (x2-x1) and a vertical (y2-y) on the screen as compared with the reproduced image at the recording time T1.
It is recorded at the position moved by 1). Therefore, when displaying the reproduced image at the recording time T2 based on the reproduced image at the recording time T1, the display correction unit 30 sets the entire screen to-(x2-x1) in the horizontal direction and-(y2- y
The display is moved by only 1) and the building 31 to be monitored appears to be stopped as shown in FIG. 9C.

Moving the image to be displayed means that, when writing the image to be output to the display 20 to the display buffer memory, the image is shifted by the number of pixels to be moved. The portion indicated by hatching 32 in FIG. 9C indicates a portion that is not used when displaying the reproduced image at the recording time T2. Even when displaying the reproduced image at the recording time T2, the display correction unit 30 uses the hatching 33. The portion indicated by is displayed on the screen using the image at the recording time T1.

With this configuration, even when the monitoring direction of the monitoring camera 1 can be changed by using the camera stand 5, the stationary monitoring target of the reproduced monitoring image can be moved without displacement. The images can be sequentially displayed on an easy-to-view screen. This is particularly effective for reproduction of a monitoring place where the electric zoom lens 6 is instructed to shoot at a telephoto having a narrow angle of view.

In each of the above embodiments, the shooting range instruction information is recorded on the n-th line of a single specific line of the video signal and recorded by the time lapse VTR. A single time-lapse VT by superimposing a single shooting range instruction information over the line and the (n + 1) th line
It is also possible to configure to record in R.

(Embodiment 4) In each of the above embodiments, the information indicating the photographing range of the monitoring camera is recorded on a specific scanning line of a video signal. when the conventional frame switcher 2 in (a) was configured to record information indicating the imaging range of the surveillance camera to the same location that has granted camera number information for specifying the surveillance camera 1 ₁ 1n Can use the conventional frame switcher 2 when reproducing the recorded tape to selectively display images in the same shooting range.

[0056]

As described above, according to the video surveillance system of the present invention, in a video surveillance system having a surveillance camera and an image recording device for recording an image of the surveillance camera, the shooting range of the surveillance camera can be changed. In addition, since the image recording device is configured to encode the instruction information of the imaging range instructing unit for instructing the imaging range to the surveillance camera and record the information in association with the video, a plurality of locations are sequentially monitored by a single surveillance camera. Even in this case, the monitoring location can be specified by referring to the shooting range instruction information extracted at the time of reproduction.

According to the video surveillance method of the present invention, at the time of recording and monitoring the video of the surveillance camera by the image recording device, at the time of recording, the imaging range instruction information for instructing the surveillance camera to specify the imaging range is encoded. The image recording apparatus records the image in association with the image, and at the time of reproduction, detects the imaging range instruction information multiplexed on the image, selects only the image that meets the conditions specified for reproduction, and displays it on the display. The display can be seen easily.

Further, at the time of reproduction, the photographing range instruction information multiplexed on the video is detected, and only the video that satisfies the conditions specified for reproduction is selected, and motion detection is performed between the video and the currently displayed screen. A good surveillance image is displayed by correcting the image to reduce blurring and displaying the image, eliminating backlash of the mechanism that moves the surveillance camera and image misalignment caused by errors in stop position control. Is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a video surveillance system according to a first embodiment of the present invention;

FIG. 2 is a front view and a bottom view showing an installation state of the monitoring camera according to the embodiment;

FIG. 3 is a configuration diagram of a video surveillance system according to a second embodiment of the present invention;

FIG. 4 is a plan view of a site showing an installation location and a monitoring location of the monitoring camera according to the embodiment, and a relationship diagram of an imaging target, a direction, an angle of view, and an imaging range designation identification code.

FIG. 5 is a waveform chart showing an example in which a shooting range designation identification code is superimposed on a video signal in the embodiment.

FIG. 6 is a configuration diagram of a reproduction system according to the embodiment;

FIG. 7 is an explanatory diagram of sampling for extracting a shooting range designation identification code from a reproduced video signal in the embodiment.

FIG. 8 is a configuration diagram of a reproduction system according to a third embodiment of the present invention.

FIG. 9 is an explanatory diagram of a display correction unit of the embodiment.

FIG. 10 is a configuration diagram of a conventional video monitoring system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surveillance camera 3 Time lapse VTR 5 Camera base 6 Electric zoom lens 7 Shooting range instruction information 8 Shooting range indicating unit 9 Video signal 10 Encoding unit 11 Identification code 12 Multiplexing unit 13 Synchronization detection unit 14 Synchronization signal 17 Playback video signal 18 Display means DESCRIPTION OF SYMBOLS 19 Display buffer 20 Display 21 Freeze instruction 22 Comparison part 23 Reproduction designation identification code 24 Synchronization detection part 25 Sampling timing generation part 26 Comparator 27 Quantization part 28 Sampling signal 30 Display correction part

Claims (6)

[Claims] 1. A video surveillance system having a surveillance camera and an image recording device for recording an image of the surveillance camera, wherein an imaging range of the surveillance camera is configured to be variable, and an imaging range for instructing the surveillance camera of the imaging range. An image monitoring system configured to encode instruction information of an instruction unit and record the information in association with the image by an image recording device. 2. The video surveillance system according to claim 1, wherein the image recording apparatus is configured to record the instruction information of the photographing range instruction section on a single scan line or a plurality of scan lines of the video signal. 3. The video surveillance system according to claim 2, wherein the image recording device records an identification code corresponding to a shooting direction and an angle of view of the surveillance camera at each time. 4. When an image recording device records and monitors an image of a surveillance camera, at the time of recording, the image recording device encodes photographing range instruction information for instructing the surveillance camera of a photographing range and records the information in association with the image. At the time of playback, a video surveillance method that detects shooting range instruction information multiplexed on video, selects only video that meets conditions specified for playback, and displays the selected video on a display. 5. At the time of reproduction, detecting photographing range instruction information multiplexed on a video, selecting only a video that meets a condition designated for reproduction, and performing motion detection with a screen being displayed, 5. The video surveillance method according to claim 4, wherein the image is displayed after being corrected so as to reduce the blur. 6. The video surveillance system according to claim 1, wherein the image recording device is configured to record the instruction information of the photographing range instructing section in the video as camera number information assigned by a camera switcher.