JPH1188871A - Video signal switching device and monitoring system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To output only a video signal, to which a specified signal is added, and to control a reproduced image at fixed speed so as to easily watch it by detecting the change of a video signal from plural video signals, adding the ID number of a television camera to the blanking period of the detected video signal and outputting that video signal while adding the specified signal expressing the change. SOLUTION: A video processing part 8 amplifies video signals 2A, 2B...2n inputted from a video input part 7 through plural amplifier circuits and outputs them to video switching parts 9A and 9B. At the same time, the change of a video signal caused by the change of an object is detected and detection information is outputted to a control part 14. The video switching part 9B switches a camera number according to the control signal inputted from the control part 14 and outputs the required video signal to a signal addition processing part 10. The signal addition processing part 10 adds the number of a television camera, which picks up the image of the video signal from the video switching part B, to the vertical blanking period of that video signal, adds the specified signal to the vertical blanking period of the change detected video signal and outputs the signals to a video output part 12B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention switches a plurality of video signals input from a plurality of television cameras, for example, on a frame (or field) basis, and adds a specific signal to a required specified video signal. It can output to a recording device such as a long-time VTR,
The present invention relates to a video signal switching device capable of selecting and outputting a video signal to which a specific signal is added from video signals reproduced from R and a monitoring system using the device.

[0002]

2. Description of the Related Art A required place to be monitored, or a subject such as a person at a required place is imaged by a television camera, and a video monitor is used to monitor a video image.
In order to provide evidence at a later date, or for reference, video signals over a long period of time are recorded on a video tape using a VTR for a long time. A video tape is played back, and a video monitor is used to check and confirm an abnormal subject.

A video signal switching device according to the prior art and a monitoring system using the video signal switching device and comprising a plurality of television cameras, a long-time VTR and a video monitor are shown in FIGS. Will be explained. FIG. 5 is a block diagram of a video signal switching device according to the related art and a monitoring system using the video signal switching device. FIG. 6 is an arrangement of video signals output from the video signal switching device to a VTR for a long time and recorded. FIG. 7 shows an image reproduced from the VTR for a long time, output from the video signal switching device in a required arrangement, and displayed on the video monitor. In FIG. 5, 1A, 1B,.
1n is a plurality of television cameras 24 arranged at required positions so as to image a required subject to be monitored, 24
Is a video signal switching device that switches a plurality of video signals input from each of the plurality of television cameras 1A, 1B,... A long-time VTR 23 that records a video signal input from the signal switching device 24 for a long time and controls video signal switching in the video signal switching device 24, for example, outputs a switching signal of 1 pulse / frame, 4 shows a video monitor that displays an image of an image signal input from the signal switching device 24. This video signal switching device outputs video signals at independent switching timings for monitoring and recording. Regarding this point, utility model registration No. 2130027
No. is described in detail in the issue.

A plurality of television cameras 1A, 1B,..., 1 arranged at required positions for monitoring a required place to be monitored or a subject such as a person at the required place.
n is a video signal 2A, 2B,.
Are output to the video signal switching device 24, respectively. The video signal switching device 24 includes a plurality of television cameras 1A, 1
.. 1n are switched in units of one frame (or one field) by a switching signal 20 separately input from the VTR 22 for a long time. The television camera sequentially sets different video signals for each frame (or one field), and a video signal 26 to which an ID number corresponding to the number of the television camera is added during a vertical blanking period is transmitted to the VTR 22 for a long time. 25 is output to the video monitor 23.

For example, assuming that four television cameras 1A to 1D are arranged to capture an image of a subject, video signals 2A to 2D output from the television cameras 1A to 1D are switched to video signals. Input to the device 24 and separately from the video signal switching device 2
4, a television camera 1A in which an ID number corresponding to the television camera number is added to the vertical blanking period as shown in FIG.
Video signal A-1, the video signal B-1 of the television camera 1B, the video signal C-1 of the television camera 1C, the video signal D-1 of the television camera 1D, and similarly, A-2, B -2, C-2, D-2,..., Which are switched for each frame (or one field), are output to the long-time VTR 22,
22.

When the long-time VTR 22 is set to the reproducing state, the video signal which is switched for each reproduced frame (or one field) and sequentially has an ID number corresponding to the number of the television camera added to the vertical blanking period is Are input to the video signal switching device 24. The video signal switching device 24 can select only a video signal of a specific television camera from the video signals obtained by adding the input ID number to the vertical blanking period and output the selected video signal to the video monitor 23. As shown in FIG. 7, the images of the selected television cameras A and C can be viewed. However, the video to be viewed on the video monitor 23 has a long VT irrespective of the change in the situation of the recorded video signal.
Reproduction is performed sequentially at the reproduction speed set in R22.

[0007]

In a video signal switching device according to the prior art and a monitoring system using the device, a video signal switching device sequentially converts video signals to be switched and output for each frame (or one field). Since only the ID number for identifying the number of the television camera is added, the video signal of the television camera having the required number can be selected and output at the time of reproduction. Regardless of whether it is recorded or not, the playback video viewed on the video monitor had to be viewed sequentially from the beginning. The present invention solves the above-described problem, and switches a plurality of video signals input from a plurality of television cameras on a frame (or field) basis, adds a television camera number, and further includes a video signal for which a change is detected. A specific signal is added and output to the recording device, and only the video signal with the required television camera number and the specific signal added from the reproduced video signals is output to the video monitor, and the reproduced video is easily viewed. It is an object of the present invention to provide a video signal switching device that can be controlled at a constant speed and a monitoring system using the device.

[0008]

In order to achieve the above object, a video signal switching device of the present invention switches a plurality of video signals input from a plurality of television cameras, and performs a blanking period of the switched video signals. A video signal switching device for adding an ID number of each of the plurality of television cameras to the video signal and outputting the video signal, detecting a change in the video signal from each of the plurality of video signals, and blanking the video signal having detected the change in the video signal. During the period, in addition to the ID number of the television camera, a specific signal indicating a change is added and output.

Further, the video signal switching apparatus of the present invention switches a plurality of video signals input from a plurality of television cameras on a frame or field basis, and performs vertical blanking of each of the switched frame or field video signals. In a video signal switching device for adding and outputting ID numbers of the plurality of television cameras during a period, a level change of a video signal is detected from each of the plurality of video signals, and a level change of a video signal in frame or field units is detected. In the vertical blanking period of the video signal in which is detected, a specific signal indicating that the television camera has a level change is added and output in addition to the ID number of the television camera. The switching of the television camera may be performed in units of a plurality of frames or a plurality of fields.

Further, the video signal switching apparatus of the present invention switches a plurality of video signals input from a plurality of television cameras on a frame or field basis, and performs vertical blanking of each of the switched frame or field video signals. In a video signal switching device for adding and outputting ID numbers of the plurality of television cameras during a period, a level change of a video signal is detected from each of the plurality of video signals, and a level change of a video signal in frame or field units is detected. In the vertical blanking period of the video signal in which the video signal is detected, in addition to the ID number of the television camera, a specific signal indicating that there is a level change can be added and output. Input number with the ID number of the From the signal, in which a video signal obtained by adding said specific signal to the ID number of the required said television camera can be selectively output.

[0011] A surveillance system using the video signal switching device of the present invention comprises a plurality of television cameras for imaging a desired subject, a video monitor for displaying an input video signal, and a video monitor for displaying an input video signal. A long-term VTR for recording and reproducing, and a level change of a video signal from each of the video signals input from the plurality of television cameras are detected, and a plurality of video signals input from the plurality of television cameras are converted into frames or An image in which the ID number of each of the plurality of television cameras is added to each vertical blanking period of the switched frame or field unit video signal by switching on a field basis and a level change of the frame or field unit video signal is detected. During the vertical blanking period of the signal, the ID of the television camera In addition to the signal, a specific signal indicating a level change can be added and output, and the ID number of the television camera and the input video signal to which the specific signal has been added during a vertical blanking period are used to output a required signal. And a video signal switching device capable of selectively outputting a video signal to which the ID number of the television camera and the specific signal are added.

[0012]

FIG. 1 is a block diagram showing an embodiment of a video signal switching apparatus and a monitoring system using the apparatus according to the present invention.
This will be described with reference to FIG. FIG. 1 is a block diagram of a video signal switching device according to the present invention and a monitoring system using the device. FIGS. 2 to 4 show the sequence of video signals output from the video signal switching device according to the present invention and the long-term VTR.
FIG. 7 is a diagram for explaining a video monitor screen in which videos reproduced from a video monitor are arranged in a required order. In FIG. 1, 1A, 1B,.
1n is a plurality of television cameras arranged at required locations to capture a required subject requiring monitoring, 3 is a plurality of television cameras 1A, 1B,.
A sensor for sensing infrared rays, light, etc., which are respectively arranged at required places for sensing a subject to be imaged by 1n;
5 is a plurality of television cameras 1A, 1B... 1n
The video signal switching device 22, which switches and outputs the video signal input from each of the video signals in a required frame (or field) unit under the control of the video switching signal, outputs the video signal input from the video signal switching device 5 for a long time. A long-time VTR (for example, a time-lapse VTR) 23 for recording and outputting, for example, a 1-pulse / frame video switching signal for controlling video signal switching in the video signal switching device 5;
Denotes a video monitor that displays a video signal input from the video signal switching device 5. Further, in the video signal switching device 5, 7 is a video input unit to which video signals from a plurality of television cameras are input, and 8 is a video input unit 7
A video processing unit that processes a plurality of video signals input from the
9A and 9B are video switching units for switching and outputting a required video signal from a plurality of video signals input from the video processing unit 8, and 10 is a vertical blanking period of the video signal input from the video switching unit 9B. A signal addition processing unit for adding an ID number corresponding to a television camera number and a specific signal to the video signal, and outputting the added signal. And a reproduction determination processing unit 12A for monitoring,
2B denotes a video output unit for outputting a video signal for recording, 13
Is a memory unit that stores a video signal determined to be added with the specific signal input from the reproduction determination processing unit 11; 14 is a control unit including a CPU that controls each unit in the video signal switching device 5; The control unit 14 is operated by the observer.
4 shows an operation unit that outputs a required operation signal to the operation unit.

A recording mode is set in an operation unit 15 provided in the video signal switching device 5, and information indicating that recording has been set is output from the operation unit 15 to the control unit 14. The plurality of television cameras 1A, 1B,..., 1n arranged to image a required place requiring monitoring or a subject such as a person at the required place are image signals 2A, 2B of the taken subject. .. 2n are output to the video signal switching device 5 respectively. In addition, a plurality of television cameras 1
A plurality of sensors 3A, 3B,... 3n for detecting infrared rays, light, and the like, which are respectively arranged at required places where A, 1B,. , The detection signals 4A, 4B... 4n
Are output to the video signal switching device 5, respectively. A plurality of television cameras 1A, 1B
..Video signals 2A, 2B... 2n input from 1n
Are input to the video input unit 7 and the plurality of sensors 3
A, 3B... Detection signals 4A, 4B input from 3n
.. 4n is input to the control unit 14.

The video input unit 7 receives the input video signal 2
2n amplify the video signals 2A, 2B... 2n and output them to the video processing unit 8. The video processing unit 8 includes the video signals 2A and 2B input from the video input unit 7.
... Amplify 2n by a plurality of amplifying circuits and output the amplified 2n to the video switching units 9A and 9B, and perform processing on each video signal. Detects a change in the level of the video signal due to the intrusion, and outputs, to the control unit 14, detection information indicating that an abnormality has occurred in a subject captured by the television camera 1A. The video switching unit 9A
Video signals 2A, 2B,... Input from the video processing unit 8
2n are sequentially switched by a control signal input from the control unit 14 and sequentially output to the video output unit 12A. Video output unit 12
A indicates the video signals 2A, 2A input from the video switching unit 9A.
B... 2n are sequentially output to the video monitor 23 as the monitor video output 17. At this time, the memory unit 13
Does not perform a read operation under the control of the control unit 14, so there is no input signal from the memory unit 13. The video monitor 23 displays the monitor video output 17 input from the video output unit 12A. The video switching unit 9B sequentially switches the video signals 2A, 2B... 2n input from the video processing unit 8 in the order of camera numbers, for example, in the order of camera numbers, and adds the switched video signals. Processing unit 1
Output to 0. The control signal input from the control unit 14 to the video switching unit 9B is such that a switching speed is set in accordance with the recording speed of the long-time VTR 22 input from the long-time VTR 22 and the video signal is switched. /
This is a signal generated by the video switching signal 20 of the frame.

The signal addition processing section 10 switches the video signal at a switching speed corresponding to the recording speed, and adds the number of the television camera that captured the video signal during the vertical blanking period of the video signal input from the video switching section 9B. At the same time, further, for example, a level change of the video signal is detected, and a specific signal is added during a vertical blanking period of the video signal in which the change of the subject is detected, and the video signal is output to the video output unit 12B. The video output unit 12B outputs the video signal to which the specific signal is further added as the recording video signal 18 for a long time when the change of the video signal and the number of the television camera input from the signal addition processing unit 10 is detected. Output to VTR22. The long-time VTR 22 records a video switching signal 20 of, for example, 1 pulse / frame according to a required recording speed while recording the recording video signal 18 input from the video output unit 12B on a video tape at a required recording speed. Output to the control unit 14. The video switching signal 20 is a signal for switching the video signal every time one frame (or field) is recorded when the recording speed of the long-time VTR 22 is in the long-time mode. The operation of adding the specific signal to the video signal described above is performed even when the plurality of sensors 3A, 3B... 3n arranged together with the plurality of television cameras 1A, 1B. Then, a detection signal is output from the sensor that has detected the intrusion to the control unit 14, and similarly to the case of a change in the video signal, the television camera having the same number as the sensor, for example, the television camera 3B for the sensor 3B
Adds a specific signal to the captured video signal.

Next, a video tape recording a video signal of a desired place requiring monitoring or a subject such as a person at the required place is reproduced on a VTR for a long time to check and confirm the video. The operation to be performed will be described. First, in the operation unit 15 provided in the video signal switching device 5,
The reproduction mode is set, and information that the reproduction has been set is output from the operation unit 15 to the control unit 14. The control unit 14 outputs a control signal based on the reproduction information input from the operation unit 15 to the video switching units 9A and 9B. Video switching unit 9A
Are switched to the reproduction mode by the control signal input from the control unit 14, and stop the operation of outputting the video signals 2A, 2B... 2n input from the video processing unit 8 to the video output unit 12A. The video switching unit 9B is switched to the reproduction mode by the control signal input from the control unit 14, and the video signals 2A, 2B... 2n input from the video processing unit 8
Is stopped to output to the switching signal addition processing section 10.

The reproduction discriminating unit 11 includes a long-time VTR 22
Then, only the video signal with the specific television camera number in the reproduced video signal 19 input from and to which the specific signal is added is output to the memory unit 13. The memory unit 13 stores the specific television camera number input from the reproduction determination processing unit 11 and the video signal to which the specific signal is added, and stores the specific television camera number at a speed controlled by the control unit 14. Only the reproduced video signal to which the number and the specific signal are added is output to the video output unit 12A. Video output unit 1
2A, since the video switching unit 9A has stopped operating, there is no video signal input from the video switching unit 9A, and a specific camera number input from the memory unit 13 and a specific signal is added. The reproduced video signal is output to the monitor 23 as the monitor output video 17. The video monitor 23 displays a monitor video output 17 composed of a reproduced video signal input from the video output unit 12A.

FIG. 2 shows an example of a video signal output from the video signal switching device according to the present invention and recorded on the VTR for a long time. Continuous video signals 2A... 2D output from television cameras 1A.
Are video signals A-1, B'-1, C-1, D-1, A 'switched for each frame (or one field).
, B-2,..., B-2,..., Indicate the state of being output from the video output unit 12B of the video signal switching device 5, and the long-time VTR 22 displays the video switched every frame (or one field). Record the signal on video tape. FIG. 3 shows an example in which a video signal to which a specific signal of a required television camera number has been added is displayed on a video monitor from among the reproduced video signals input from the long-time VTR to the video signal switching device according to the present invention. Things. B'-1, A'-2, C'-2, B'- in the video signal switched for each frame (or one field) shown in FIG.
3, D'-3, A'-4, C'-4, D'-4, A'-n
Shows a video signal to which a captured image has changed and a specific signal has been added. FIG. 3 shows a state in which only the video signal of the television camera 1A is selected and sequentially displayed on a monitor. Is shown. At this time, if the video is switched for each frame, the change of the video is too fast to be visually confirmed, so that the still image is reproduced.

FIG. 4 shows video signals of four television cameras to which a specific signal of a required television camera number is added from among the reproduced video signals input from the long-time VTR to the video signal switching device according to the present invention. Is an example in which the screen of the video monitor is divided into four and displayed. The television camera A,
A video signal to which a specific signal of the television camera B is added at the upper right, a television camera C at the lower left, and a video signal to which a specific signal of the television camera D is added at the lower right are displayed.
Images from one television camera can be confirmed on the display screen of one video monitor. In addition, long time VTR
The number of video signals for each frame (or one field) to which the specific signal is added in the reproduced video signal 19 output from 22 increases or decreases depending on the change of the subject. Therefore, the VTR control signal 21 is output from the control unit 14 to the long-time VTR 22 by the operation of the operation unit 15, and the reproduction speed of the long-time VTR 22 is adjusted according to the storage capacity of the memory unit 13 for storing the video signal to which the specific signal is added. Is variably controlled. That is, V is larger than the storage capacity of the memory unit 13.
When the number of video signals to which the specific signal of the reproduced video signal sent from the TR 22 is added is small, the reproduction speed is increased,
If the storage capacity of the memory unit 13 is likely to be insufficient, the reproduction speed is reduced.

[0020]

According to the present invention, a plurality of video signals input from a plurality of television cameras are switched on a frame (or field) basis, a television camera number is added, and a change is detected on the detected video signal. Is output to a recording device with a specific signal added thereto, outputs only the video signal with the required television camera number and the specific signal added from the reproduced video signals to a video monitor, and reproduces the reproduced video. It is possible to provide a video signal switching device that can be controlled at a constant speed that is easy to see and a monitoring system using the device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video signal switching device according to the present invention and a monitoring system using the device.

FIG. 2 is an explanatory diagram of a video signal output from a video signal switching device according to the present invention.

FIG. 3 is an explanatory diagram of a screen displaying a video signal output from a video signal switching device according to the present invention on a video monitor.

FIG. 4 is an explanatory diagram of a 4-split screen in which a video signal output from a video signal switching device according to the present invention is displayed on a video monitor.

FIG. 5 is a block diagram of a monitoring system using a video signal switching device according to the related art.

FIG. 6 is an explanatory diagram of a video signal output from a conventional video signal switching device.

FIG. 7 is an explanatory diagram of a drawing in which a video signal output from a video signal switching device according to the related art is displayed on a video monitor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Television camera, 3 ... Sensor, 5 ... Video signal switching device, 7 ... Video input part, 8 ... Video processing part, 9 ... Video switching part, 10 ... Signal addition processing part, 11 ... Reproduction discrimination processing part,
12: video output unit, 13: memory unit, 14: control unit, 1
5: operation unit, 22: long-time VTR, 23: video monitor.

Claims (4)

[Claims] 1. A video signal switching device for switching a plurality of video signals input from a plurality of television cameras, adding an ID number of each of the plurality of television cameras during a blanking period of the switched video signals, and outputting the video signals. Detecting a change in a video signal from each of the plurality of video signals, and specifying a change signal in addition to the ID number of the television camera during a blanking period of the video signal in which the change in the video signal is detected. And a video signal switching device. 2. A plurality of video signals input from a plurality of television cameras are switched in frame or field units, and each of the plurality of television cameras is switched during a vertical blanking period of the switched frame or field unit video signals. A video signal switching device that outputs a level change of a video signal from each of the plurality of video signals and detects a level change of a video signal in a frame or field unit. A video signal switching device, wherein during a period, in addition to the ID number of the television camera, a specific signal indicating a level change is added and output. 3. A plurality of video signals inputted from a plurality of television cameras are switched in units of frames or fields, and the plurality of television cameras are respectively switched during a vertical blanking period of the switched video signals in units of frames or fields. A video signal switching device that outputs a level change of a video signal from each of the plurality of video signals and detects a level change of a video signal in a frame or field unit. During the period, in addition to the ID number of the television camera, a specific signal indicating that the television camera has a level change can be added and output, and the ID of the television camera can be output during the vertical blanking period.
A video signal switching device capable of selectively outputting a video signal to which a required ID number of the television camera and the specific signal are added from an input video signal to which a number and the specific signal are added. 4. A plurality of television cameras for imaging a desired subject; a video monitor for displaying an input video signal; a long-time VTR for recording and reproducing an input video signal; Detecting a level change of the video signal from each of the video signals input from the cameras, switching a plurality of video signals input from the plurality of television cameras in frame or field units, and switching the video signal in frame or field units; The ID number of each of the plurality of television cameras is added to each of the vertical blanking periods, and the ID of the television camera is set during the vertical blanking period of the video signal in which a change in the level of the video signal in units of frames or fields is detected. In addition to the number, add a specific signal indicating that there is a level change And output the TV camera ID number and the specific signal from the input video signal to which the TV camera ID number and the specific signal are added during the vertical blanking period. A video signal switching device capable of selectively outputting a selected video signal.