JPS61206390A - Itv monitor - Google Patents

Abstract

PURPOSE:To delete a burden of monitoring or an used amount of a tape of a tape recorder by comparing the contents of memory of a field memory with a video signal after a fixed time, detecting its difference, providing a identifying circuit for issuing an output when the difference exceeds a fixed value, and issuing an output externally when any change is produced in an image plane. CONSTITUTION:A difference detecting circuit 2 comprises a field memory storing an image plane of an video signal or a line memory 5 storing plural line signals a difference comparison detecting circuit 6 comparing the output this memory with the video signal after a fixed time and a identifying circuit 7 outputting when a difference signal exceeds a fixed value. When there is any change above a fixed value in the video signal of an area to be monitored which is photographed by the camera 1, it is identified and detected, an alarming buzzer 3 is operated by the detecting signal and an attention of a person for monitoring can be directed to a monitor TV 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an ITV monitoring device, and particularly to a monitoring device suitable for monitoring the entrance of a building.

[Background of the invention]

[Electronic Communication Handbook J (1969) No. 116
As described in Section 1 of 1'-I TV Applications on page 9, conventional ITV equipment photographs objects to be monitored using a TV camera and simply monitors them remotely using a monitor TV via a person. Therefore, there was a drawback that the supervisor had to watch the monitor at all times.

[Purpose of the invention]

The present invention detects any change on the monitoring screen, issues an alarm such as a buzzer, and allows the supervisor to either look at the screen only at that time or start the VTR immediately after the detection. , by recording the screen for a certain period of time.

[Summary of the invention]

The present invention achieves the above object in an ITV monitoring device by comparing the contents of a field memory or a plurality of line memories with the next field or field or line signal after a certain period of time and detecting the difference. This is how it was done.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained in detail using the drawings.
Figure 1 shows an example of the configuration of this system.

14; i TV camera, 2 is a difference detection circuit that detects and detects the screen (field or J-in) memory and difference, which is the center of the present invention; and 3 is a difference detection circuit that drives a buzzer based on the result; 3 is a screen that detects any change in the screen; If there is a buzzer that issues an alarm by the output of the difference detection circuit 2, 4 is the ITV
This is a monitor TV.

Twenty-first, a configuration example of the difference detection circuit 2 will be shown.

5 is a field memory that stores an image portion of a video signal or a line memory that stores a plurality of line signals; 6 is a difference comparison and detection circuit that compares the output of this memory with the video signal after a certain time difference and outputs the signal; 7 is an identification circuit that outputs an output when the difference signal exceeds a certain value. The operation of this system will be explained with reference to FIGS. 1 and 2.゛The difference detection circuit 2 uses the video signal of the monitored area photographed by the camera 1 to identify and detect if there is a change in the screen that exceeds a certain value, and the alarm buzzer 3 is activated based on the detection signal. , the observer's attention can be directed to the monitor TV4.

Another embodiment is shown in Fig. 3, and 1.2.4 in the figure.
is similar to the groove composition shown in FIG. 1; 8 is a video tape recorder; 9 is a control circuit for operating the video tape recorder 8 for a certain period of time based on the output of the difference detection circuit 2;

According to this configuration, the video tape recorder can be activated only when there is some change on the screen.0 [Effects of the Invention] Conventionally, a supervisor always watches a television monitor or operates a tape recorder at all times. However, according to the present invention, this drawback is overcome and the burden of monitoring or the amount of tape used in a video tape recorder is significantly reduced.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG.
FIG. 2 is a diagram showing the basic configuration of the difference detection circuit shown in FIG. 1, and FIG. 3 is a diagram showing the configuration of another embodiment of the present invention. 1...TV camera 2...Difference detection circuit 3...Buzzer 4...Monitor TV 5...Line memory 6...Difference comparison detection circuit 7...Identification circuit 8...Video tape Recorder No. 70 No. 20 Fig. 3

Claims (2)

[Claims] (1) A field memory that can store one field of a video signal, a circuit that compares the contents of this memory with the video signal after a certain period of time and detects the difference, and outputs if the difference exceeds a certain value. What is claimed is: 1. An ITV monitoring device comprising: an identification circuit that outputs an output; and a means for outputting an output to the outside when any change occurs on a screen. (2) An ITV monitoring device characterized in that the means for outputting an output to the outside as set forth in claim 1 includes a magnetic recording means operated by this output.