JPH0662409A - Monitoring video signal recording device - Google Patents

Abstract

PURPOSE:To provide a monitoring video signal recording device which can monitor the video signals with high efficiency by recording only the video signals supplied from the video camera that is photographing the moving images and never recording the undesired still images. CONSTITUTION:The video signals supplied from the video cameras 1-3 are inputted to the switches 4 and 5. The output of the switch 5 is applied to a frame memory circuit 7 and a comparator 8 and compared with the signal preceding the applied output by one frame and received via the circuit 7 by the circuit 8. A movement deciding circuit 9 detects the movement of an image. An input switching circuit A 10 that detected a video camera which is photographing a moving image controls the switch 4 and an identification signal adding circuit 12 and adds the identification signal corresponding to the video camera to the video signal having a movement for recording. In such a constitution, only the video signals supplied from the video camera photographing the moving image are recorded and therefore the video signals are monitored with high efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance video signal recording apparatus using a plurality of video cameras.

[0002]

2. Description of the Related Art In recent years, a monitoring video signal recording apparatus has mainly used a method of monitoring a plurality of places by using a plurality of video cameras and recording the monitoring video.

FIG. 2 shows a conventional monitoring video signal recording apparatus, in which 1 to 3 are video cameras and 4
Is a switching device, 6 is a video signal recording circuit for recording a video signal on a recording medium such as a magnetic tape, and 12 is an input switching circuit B for switching the switching device 4 at preset time intervals.

With respect to the conventional monitoring video signal recording apparatus configured as described above, the relationship and operation of each component will be described below with reference to FIG.

The video signals output from the video cameras 1 to 3 are switched at a preset time interval by the switch 4 controlled by the input switching circuit B12 and input to the video signal recording circuit 6. The video signal recording circuit 6 records the input video signal on a recording medium.

[0006]

However, in the above configuration, all the video signals output from the respective video cameras are recorded at constant time intervals. That is, since the video signal of a video camera capturing a video without any motion and the video signal of a video camera capturing a video with motion are recorded at the same time interval, there is no motion worth monitoring. Due to the image, the amount of information of the moving image which is originally worth monitoring is small, and there is a problem that it cannot be sufficiently monitored.

In view of the above problems, the present invention provides a video signal recording apparatus for monitoring, which does not record video without motion, which has no monitor value, but records video with motion, which has monitor value.

[0008]

In order to solve the above problems, the present invention relates to a plurality of video cameras, a switch A for switching the video signal output from the video cameras, and a video signal of at least one frame. A frame memory circuit that outputs the image signal, a comparison circuit that compares the current video signal with the video signal of one frame before that output from the frame memory circuit, and a motion determination that detects the motion of an image using the output of the comparison circuit. A circuit, a switch B for switching a video signal input to the frame memory circuit and the motion detection circuit, a detection input switching circuit for controlling the switch B, and outputs from the motion detection circuit and the detection input switching circuit The input switching circuit for controlling the switching device A and the identification signal corresponding to the video camera for outputting the video signal selected by the switching device A are the video signals. An identification signal adding circuit for adding, and has a configuration that includes a video signal recording circuit for recording the video signal output from the identification signal addition circuit in the recording medium.

[0009]

According to the present invention, with the above-described structure, the current video signal and the video signal of one frame before output from the frame memory circuit are compared by the comparison circuit, and the motion discrimination circuit uses the output of the comparison circuit. Detect image movement,
Then, the input switching circuit detects the video camera capturing a moving image from the outputs of the motion determination circuit and the detection input switching circuit. Further, based on the detection information, the switch A is controlled to output the video signal from the video camera capturing the moving image to the identification signal adding circuit. Then, the video signal is recorded on the recording medium by the video signal recording circuit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A monitoring video signal recording apparatus according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of the present invention. 1 to 4, 6 in FIG.
2 are the same constituent elements as those in FIG. 5 is a switch, 7 is a frame memory circuit for storing and outputting a video signal of at least one frame, 8
Is a comparison circuit for comparing the current video signal with the video signal of one frame before output from the frame memory circuit 7, 9
Is a motion discriminating circuit which detects the movement of the image using the output of the comparison circuit, and 10 detects the video camera which is capturing a moving image based on the output signal of the motion discriminating circuit 9 and the output of the detection input switching circuit 11. The input switching circuit A, 11 is a detection input switching circuit for controlling the switcher 5 at a time interval of two frames or more, and 12 is added with an identification signal representing the identification of the video camera corresponding to the video signal currently recorded in the video signal. Is an identification signal adding circuit.

With respect to the monitoring video signal recording apparatus of this embodiment having the above-described components, the relationship and operation of each component will be described below with reference to FIG.

The video signals output from the video cameras 1 to 3 are input to the switch 4 and the switch 5. The detection input switching circuit 11 controls the switching device 5 at preset time intervals to switch the video signal to be input to the frame memory circuit 7 and the comparison circuit 8. Further, the information is input to the input switching circuit A.
It also outputs to 10. Frame memory circuit 7 and comparison circuit 8
Based on the motion information detected by the motion discriminating circuit 9 and the output from the detection input switching circuit 11, the input switching circuit 10 discriminates the video camera which is capturing a moving image. Then, the input switching circuit A10 controls the switching device 4 to switch the video signal from the video camera capturing the moving image at a preset time interval. Further, the identification signal adding circuit 12 adds the identification signal of the video camera corresponding to the video signal output from the switch 4 to the video signal. The video signal output from the identification signal adding circuit 12 is recorded on the recording medium by the video signal recording circuit 6. On the other hand, when there is no video camera capturing a moving image, the video signals of all the video cameras are sequentially switched and recorded.

As described above, according to this embodiment, a frame memory circuit for storing and outputting a video signal of at least one frame, as a generator of image motion information of the input switching circuit, a current video signal and the frame memory. A comparison circuit for comparing the video signal of one frame before output from the circuit,
A motion discriminating circuit for detecting the motion of an image using the output of the comparison circuit is provided, and a video camera capturing a moving image is detected from the outputs of the motion discriminating circuit and the detection input switching circuit to switch the switch. By providing the input switching circuit for controlling, it is possible to record only the video signal from the video camera which is capturing a moving image.

Although three video cameras are connected in the above description, one or more video cameras may be connected.

Further, in the above description, the identification signal is added to the video signal and recorded. However, the identification signal may be added using another signal to be recorded on the recording medium.

[0016]

As described above, according to the present invention, it is possible to provide a monitoring video signal recording apparatus having a high monitoring efficiency, which can record only a video having a moving value in the image and having a monitoring value. .

[Brief description of drawings]

FIG. 1 is a configuration diagram of a monitoring video signal recording apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional monitoring video signal recording device.

[Explanation of symbols]

 1 Video Camera 2 Video Camera 3 Video Camera 4 Switching Device 5 Switching Device 6 Video Signal Recording Circuit 7 Frame Memory Circuit 8 Comparison Circuit 9 Motion Discrimination Circuit 10 Input Switching Circuit 11 Detection Input Switching Circuit 12 Identification Signal Addition Circuit

Claims (1)

[Claims] 1. A plurality of video cameras, a switch A for switching video signal output from the video cameras, a frame memory circuit for storing and outputting a video signal of at least one frame, a current video signal and the frame memory. A comparison circuit for comparing the video signal of one frame before output from the circuit, a motion determination circuit for detecting the motion of the image using the output of the comparison circuit, and a video signal input to the frame memory circuit and the motion detection circuit. A switch B for switching the switch, a detection input switching circuit for controlling the switch B, an input switching circuit for controlling the switch A using outputs from the motion detection circuit and the detection input switching circuit, and the switch. An identification signal adding circuit for adding an identification signal corresponding to a video camera outputting the video signal selected by A to the video signal; and the identification signal adding circuit. Monitoring the video signal recording apparatus and a video signal recording circuit for recording the image signal output to the recording medium.