JPH09214946A - Mobile object tracking camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a system with which an invading object can be automatically tracked and monitored by a simple device. SOLUTION: The output video signal of a television camera 2 is distributed by a distributor 2, displayed on a television monitor 4 and monitored. The video signal is distributed by the distributor 3 and respectively distributed to a video sensor 5a or the like. At the video sensor 5a, etc., band-shaped detection areas are set to four of up, down, the left and the right sides in a subject, the change of the output video signal in this area with the passage of time is detected and a sensor output L5a, etc., is outputted. When a mobile objects moves to the left and enters the detection area set to the left side, for example, the correspondent video sensor 5a outputs the sensor output L5a, for example. When a control part 6 detects the output L5a of the video sensor, the control part 6 sends a drive signal to a turn control part 7 and the television camera 2 is turned to the left by a turning part 7. Afterwards, the television camera is similarly turned in the respective moving directions of the mobile object and the mobile object is tracked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera monitoring system for monitoring an intruding object with a television camera for crime prevention, and more particularly to a moving body tracking camera system for tracking the movement of an intruding object with a simple structure.

[0002]

2. Description of the Related Art For tracking and monitoring intruders,
For example, there is an indoor monitoring device disclosed in JP-A-5-334572.
In the indoor monitoring device, two cameras are used, the first camera takes a picture of the entire room with a fixed field of view, and signals for detecting an intruder and tracking are obtained based on the video signal of the first camera. The second camera is generated and used to drive the second camera to track an intruder. However, this method has a problem in that two cameras are required, the apparatus is large-scaled, and the installation place of the cameras is wide.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to construct a system capable of automatically tracking and monitoring an intruding object with a simple device.

[0004]

A video sensor is provided in which a constant area is set in a subject image, and a change in output video signal of a television camera above a predetermined level is detected and output in the same area. A moving subject is automatically tracked by using a plurality of sensors and setting the detection region in the peripheral portion of the subject image and turning the camera in the direction of the region where the output of the video sensor was present.

Four video sensors are provided, and strip-shaped detection regions having long sides along each side are set on the four sides of the subject image in the upper, lower, left and right sides to correspond to the video sensors, and the movement of the subject in the upper, lower, left and right directions is performed. Track automatically.

Two video sensors are provided, and strip-shaped detection areas having long sides along the respective sides of the subject image are set on the upper and lower sides or the left and right sides of the subject image corresponding to the video sensors, and the upper and lower sides of the subject are detected. Alternatively, the left and right movements are automatically tracked.

The moving body to be monitored has a substantially constant size, and the amount of one turn of the video camera is in the direction of the detection area where the output of the video sensor was present, from 1/2 of the width of the image in the substantially same direction. The TV camera is turned by a width obtained by subtracting 1/2 of the size of the moving body.

A turning amount setting means for turning the television camera at one time and a storage means for the same setting amount are provided so that the turning amount can be set according to the situation of the setting place of the television camera.

A means for detecting the zoom amount of the lens of the television camera is provided, and the turning amount is changed according to the zoom amount.

Driving means for adjusting the zoom amount of the lens of the television camera is provided, and the frequency at which the sensors having the detection areas set on the opposite sides of the subject image output at the same time is measured. Adjust the amount in the wide-angle direction,
If it is less than a certain value, adjust to the telephoto direction.

[0011]

[Function] A certain area is set in the subject image, and a video sensor for detecting and outputting a change of the output video signal of the television camera above a certain level in the area is provided, and a plurality of the same video sensors are used. The detection area is set in the peripheral part of the subject image, and the moving subject is automatically tracked by turning the camera in the direction of the area where the output of the video sensor was present. It is possible to detect movement and track the same moving body.

By providing four video sensors and setting strip-shaped detection areas having long sides along each side on the four sides of the subject image corresponding to the video sensors, the vertical and horizontal directions of the subject are set. The movement of can be detected and automatically tracked.

Two video sensors are provided, and strip-shaped detection areas having long sides along the respective sides of the subject image are set on the upper and lower sides or the left and right sides of the subject image corresponding to the same video sensor. Alternatively, it is possible to obtain a simple system that automatically tracks a left-right movement and normally monitors a moving object that moves in one direction such as the left-right direction.

The moving body to be monitored has a substantially constant size, and the amount of one turn of the video camera is in the direction of the detection region where the output of the video sensor was present, from 1/2 of the width of the image in the substantially same direction. By rotating the television camera by a width obtained by subtracting 1/2 of the size of the moving body, the moving body can always be displayed in the center of the display screen.

By providing a turning amount setting means for turning the television camera at once and a storage means for the same setting amount, and setting the turning amount according to the situation of the setting place of the television camera, the camera can be set. It is possible to set an optimum turning amount according to the distance of the subject from the installation location of.

A means for detecting the zoom amount of the lens of the television camera is provided, and by changing the turning amount according to the zoom amount, the optimum turning amount is automatically reset even if the zoom is changed.

Driving means for adjusting the zoom amount of the lens of the television camera is provided, and the frequency of simultaneous output from the sensors having detection areas set on opposite sides of the subject image is measured. When the frequency is equal to or higher than a certain value, the zoom is performed. Adjust the amount in the wide-angle direction,
When the value is below a certain value, the moving object can be constantly displayed on the display screen by adjusting in the telephoto direction.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic block diagram of one embodiment of a moving object tracking camera system according to the present invention. The output video signal of the TV camera 2 is distributed by the distributor 3 and displayed on the TV monitor 4 to monitor the subject image of the camera 2. The output video signal of the television camera 2 is distributed to the television monitor 4 by the distributor 3, and is also distributed to the plurality of video sensors 5a, 5b ,. The video sensors 5a, 5b, ... Set a detection area in an arbitrary area in the subject image, detect the time change of the output video signal of the TV camera 2 corresponding to the detection area, and change it to a video signal. If there is a sensor output S
5a, S5b, ... Are output.

FIG. 2 is a schematic block diagram of a video sensor of one embodiment of the moving object tracking camera system according to the present invention. The above-mentioned detection area is created from the pulse signal S3 such as the video signal clock, the horizontal synchronization signal, the vertical synchronization signal, etc. by the area generation unit 56 constituted by a counter or the like. The set position of the detection area in the subject image can be set by changing the count value of the counter of the area generation unit 56 by the area setting unit 57 including a dip switch or the like. The video signal from the television camera is cut out by the gate 51 by the output of the area generation unit 56, switched by the switching unit 52 for each field and stored in the separate memories 53 and 54. When the outputs of the memories 53 and 54 are compared by the comparator 55 and a change is detected, the sensor output S
2 is output.

FIG. 3 is a schematic diagram of a subject image on a television monitor in which the detection area of the video sensor of one embodiment of the moving object tracking camera system according to the present invention is set. Strip-shaped detection regions 25a, 25b, 25c, 25d having long sides along the respective sides are set on the four sides of the subject image 24 in the upper, lower, left and right sides. When the moving object which is the subject of the TV camera 2 in FIG. 1 moves to the left and enters the detection area 25a,
The video sensor 5a corresponding to the detection area 25a outputs S5.
Issue a. When the control unit 6 detects the output S5a of the video sensor, the control unit 6 sends a drive signal to the turning drive unit 7 to turn the television camera 2 leftward.
Further, when the moving body which is the subject of the television camera 2 moves in the upper left direction and enters the detection areas 25a and 25b,
Video sensor 5a corresponding to the detection areas 25a and 25b
And 5b provide outputs S5a and S5b. Output S5a,
When the control unit 6 detects S5b, the control unit 6 sends a drive signal to the turning drive unit 7 and the turning drive unit 7 causes the television camera 2 to operate.
Turn to the upper left. Similarly, the television camera can be turned in each moving direction of the moving body.

FIG. 4 is a schematic diagram of a subject image on a television monitor in which a detection area of a video sensor of another embodiment of the moving object tracking camera system according to the present invention is set. Two video sensors are provided, and their detection areas 35a and 35b are provided.
Are arranged on the left and right of the subject image, for example. By rotating the television camera to the left and right in the same manner as described above, it is possible to automatically track the moving body of the subject moving to the left and right.

Since the moving speed of the moving body is generally limited, the television camera can be made to turn following the moving body by setting the turning amount to a constant value that is experimentally determined. Further, the amount of one turn of the video camera is the width obtained by subtracting 1/2 of the size of the moving body from 1/2 of the width of the subject image in the substantially same direction in the direction of the detection area where the output of the video sensor is output. Only turn the TV camera. That is, for example, when the moving body J1 having the diameter L1 is detected in the detection area 35a in FIG. 4, the moving body J is moved from 1/2 of the width L2 of the subject image.
Pivot the TV camera by the width minus one-half the diameter. Since the distance L3 between the center line C1 of the moving body before turning and the center C2 of the screen is L2 / 2-L1 / 2, the moving body after turning is displayed on J2 at the center of the screen.

Since the moving body to be monitored is an intruder or the like, its size can usually be assumed in advance. However, the relative size of the subject image may differ depending on the installation position of the camera depending on the size of the setting location of the television camera and the like. Therefore, in FIG. 1, a switch board 9 such as a numeric keypad and a non-volatile memory 10 are provided, and the size of the moving body assumed to be monitored is changed from the switch board 9 to the control unit 6 according to the installation conditions.
To be stored in the non-volatile memory 10. During the moving body tracking operation described above, the size of the moving body assumed from the non-volatile memory 10 can be read to set the turning amount.

The size of the moving object on the subject image changes depending on the zoom amount of the television camera. Therefore, in FIG. 1, the zoom amount is read from the zoom drive unit 8 of the camera lens 1 which is manually set by the control unit 6 in FIG.
It is also possible to adjust and reset the size of the preset moving body.

In FIG. 1, for example, the control unit 6 measures the output frequency of the outputs S5a and S5b of the video sensors 5a and 5b corresponding to the detection areas 35a and 35b set on the left and right of the subject screen of FIG. If both are output at a certain frequency or more, the moving body may run off the subject screen. Therefore, the control unit 6 outputs a zoom drive signal to the zoom drive unit 8 of the camera lens 1 to drive the camera lens 1 in the wide-angle direction. Since the camera lens 1 is in the wide-angle direction, the image of the moving body becomes smaller, and the subject image 3
It will fit within 4. On the contrary, when the output frequency is equal to or less than the predetermined value, the image of the moving body is small, and therefore the control unit 6 controls the zoom driving unit 8 to enlarge the image of the moving body with the camera lens in the telephoto direction. . In this way, the moving body can be constantly displayed on the display screen.

[0026]

As described above, in a surveillance camera system for displaying and monitoring a subject image captured by a television camera color on a television monitor, a detection area for detecting a moving body is provided in the peripheral portion of the subject image, By detecting the moving direction of the moving body and driving the TV camera to rotate and automatically tracking the moving body, it is possible to detect the movement of the moving body and monitor the tracking of the moving body with one TV camera. Becomes Therefore, it is possible to easily configure a system capable of tracking and monitoring an intruder or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a moving object tracking camera system according to the present invention.

FIG. 2 is a schematic block diagram of a video sensor of one embodiment of a moving object tracking camera system according to the present invention.

FIG. 3 is a schematic diagram of a subject image displayed on a television monitor in which a detection area of a video sensor of one embodiment of a moving object tracking camera system according to the present invention is set.

FIG. 4 is a schematic diagram of a subject image displayed on a television monitor in which a detection area of a video sensor of another embodiment of the moving object tracking camera system according to the present invention is set.

[Explanation of symbols]

 1 Camera Lens 2 Television Camera 3 Distributor 4 Television Monitor 5a, 5b, 5c, 5d Video Sensor 6 Control Unit 7 Swiveling Drive Unit 8 Zoom Drive Unit 9 Switch Board 10 Nonvolatile Memory 51 Gate 52 Switch 53, 54 Memory 55 Comparator 56 area generating section 57 area setting section S1 video signal S2 video sensor output S3 pulse signal 24 subject image 25a, 25b, 25c, 25d detection area 34 subject image 35a, 35b detection area J1, J2 moving body

Claims (7)

[Claims] 1. A surveillance camera system for displaying and monitoring a subject image captured by a television camera on a television monitor, wherein a detection area is set in the subject image, and an output video signal of the television camera is set in the detection area. Is provided with a video sensor that detects and outputs a change of a certain level or more, and a plurality of the same video sensors are used to set the detection area in the peripheral portion of the subject image, and the detection area where the output of the video sensor exists A moving object tracking camera system characterized by automatically tracking a moving subject by turning the camera in the direction of. 2. The four video sensors are provided, and strip-shaped detection areas having long sides along each side are set at four sides of the subject image corresponding to the video sensors, and the four sides of the subject image are set to the top, bottom, left and right sides of the subject image. The moving object tracking camera system according to claim 1, wherein the movement of the object is automatically tracked. 3. A plurality of the video sensors are provided, and strip-shaped detection regions having long sides along each side of the subject image are set on the upper, lower, left and right sides of the subject image corresponding to the video sensors. 2. The moving body tracking camera system according to claim 1, wherein the vertical and horizontal movements of the subject are automatically tracked. 4. The moving body to be monitored has a substantially constant size,
The amount of one turn of the video camera is 1 of the width of the subject image in the substantially same direction in the direction of the detection area where the output of the video sensor was.
2. The television camera is turned by a width obtained by subtracting 1/2 of the size of the moving body from / 2.
The moving body tracking camera system according to claim 2 or 3. 5. A turning amount setting means for turning the television camera at one time and a storage means for setting the turning amount are provided so that the turning amount can be set according to the situation of the setting place of the television camera. The moving object tracking camera system according to claim 4, which is characterized. 6. The moving body tracking camera system according to claim 5, further comprising a zoom amount detecting means for the lens of the television camera, wherein the turning amount is changed in accordance with the zoom amount. 7. A driving means for adjusting the zoom amount of the lens of the television camera is provided, and the frequency of simultaneous output from the sensors having the detection areas set on opposite sides of the subject image is measured. 4. The moving body tracking camera system according to claim 2, wherein the zoom amount is adjusted in a wide-angle direction and is adjusted in a telephoto direction when the zoom amount is a certain value or less.