JPS613591A - Detector of abnormal event - Google Patents

Abstract

PURPOSE:To obtain an abnormal event detector while improving the reliability and saving power by storing a fixed picture of steady-state and subtracting the fixed picture and a picture obtained from a television camera to raise an alarm based on the output. CONSTITUTION:The fixed picture is inputted and stored in a picture buffer 5 from an output of a television camera 1 in advance at first. Then the circuit is switched, a picture of the camera 1 is inputted to a picture memory 6 and an output signal of the picture buffer 5 and the picture memory 6 is inputted to an operating circuit 7. The output of the picture memory 6 is subtracted from the output of the picture buffer 5 in the operating circuit 7 and the result is displayed on a receiver 3. Thus, the picture emphasizing the result of extraction of changed part due to elapse of time is displayed, resulting that a control circuit 4 is activated to raise an alarm sound thereby detecting an abnormal event.

Description

[Detailed description of the invention] [Industrial application field] , The present invention relates to an abnormal situation detection device.

[Conventional technology]

BACKGROUND ART Conventionally, a means for detecting fires and the like has been to install television cameras at specific locations and monitor smoke, flames, etc. on the television screen.

Similarly, security televisions for buildings and the like are equipped with television cameras at specific locations and are monitored using television screens.

[Problem that the invention seeks to solve]

However, such means have the following drawbacks.

(1) A monitor is required to monitor the TV screen, and the monitor must constantly monitor the TV screen.

(2) When multiple television cameras are used, faithful monitoring requires as many monitor televisions as the number of cameras.

(3) Small changes on the TV screen are easy to overlook.

The present invention has been proposed in view of the above circumstances, and it eliminates the need for monitors to constantly monitor the TV screen, sounds an alarm buzzer, etc. only in the event of an abnormality, and calls the attention of related parties. It is an object of the present invention to provide an accurate and labor-saving abnormal object detection device that displays only abnormal objects on a screen.

[Means for solving problems]

To this end, the present invention provides an image buffer that stores steady-state fixed images obtained by a television camera, an image memory that constantly inputs video signals obtained from the television camera,
It comprises an arithmetic circuit that subtracts one of the image signal of the image buffer and the image signal of the image memory from the other, a receiver that displays an image based on the output of the arithmetic circuit, and an alarm circuit that issues an alarm. It is characterized by

[For production]

According to this configuration, it is not necessary for the monitor to constantly monitor the TV screen, the occurrence of an abnormal situation is automatically detected, and the abnormal situation is accurately and labor-savingly detected by displaying the abnormal situation on the TV screen. You can get the equipment.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings. Figure 1 is a block diagram showing the circuit configuration, Figure 2 (1),
(23, (3), (4), '(5), (6
) are explanatory diagrams showing the outputs of the respective parts in FIG. 1, and FIG. 3 is an explanatory diagram showing the action of the arithmetic circuit in FIG. 1.

In the above figure, 1 is a plurality of television cameras, 2 is a signal processing device, 3 is a receiver, 4 is a control circuit, 5 is an image buffer, 6 is an image memory, and 7 is an arithmetic circuit.

In such a structure, the television camera 1 converts images into electrical signals, and a plurality of television cameras 1 can be installed.

The video electrical signal is connected to a receiver 3 and a control circuit 4 via a signal processing device 2, and then transmitted to a television camera 1 and a signal processing device 2. Gakuzoki 3. The control circuits 4 are installed at different locations by respective connecting cables.

First, a fixed image from the output of the television camera 1 is input into the image sofa 5 and stored.

Thereafter, the circuit is switched (not shown), and subsequent camera images are input into the image memory 6.

Then, the output signals of the image buffer 5 and the image memory 6 are input to the arithmetic circuit 7.

The arithmetic circuit 7 subtracts the image memory 6 from the output of the image buffer 5 and displays the result on the receiver 3.

For example, when a fixed image showing a tree T is captured by the television camera 1 as shown in FIG. 2 (1), the scanning line S
'CLK? i=? The resulting video output is as shown in FIG. 2 (2), and is stored in the image file 5.

Now, when a person M appears near the tree T as shown in (3) in the same figure, the scanning line 5CL of the television camera 1
The video output along K is as shown in FIG. 4 (4), and this output is stored in the image memory 6.

As a result, the arithmetic circuit 7 subtracts the video output shown in (4) in the same figure from the video output shown in (2) in the same figure, and the video signal shown in (5) in the same figure is input to the receiver 3. , the receiver 3 displays the image shown in FIG. 6 (6).

In this case, the subtraction of the video signal in the arithmetic circuit 7 is performed by a known method. For example, as shown in FIG. Then, image B is similarly scanned to obtain an information signal, the sign of which is reversed and added.

Therefore, if another image is added as shown in FIG. 2 (3), only that signal remains and is determined as an abnormal signal.

Therefore, it is possible to emphasize and display an image in which only the portions that have changed over time are extracted.

The part that controls the above calculations is the arithmetic circuit 7 shown in FIG.
It is possible to generate an alarm lamp or an alarm sound to notify of an abnormality in the monitoring area.

[Effects of the Invention] In short, according to the present invention, there is an image buffer that stores a steady-state fixed image obtained by a television camera, an image memory that constantly inputs a video signal obtained from the television camera, and an image buffer that stores images in the image buffer. Reliability is improved by including an arithmetic circuit that subtracts one image signal from the image signal and the image memory, a receiver that displays an image based on the output of the arithmetic circuit, and an alarm circuit that issues an alarm. The present invention is industrially extremely useful because it provides an abnormal situation detection device that is improved and saves labor.

[Brief explanation of the drawing]

FIG. 1 is a Pronk diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 2 is a Pronk diagram (11, (2), f31, (4)
, (5). (6) is an explanatory diagram showing the output of each part in FIG. 1, and FIG. 3 is an explanatory diagram showing the operation of the arithmetic circuit in FIG. 1. 1... Television camera, 2... Signal processing device, 3-1
6... Image memory, 7... Arithmetic circuit, T... Tree, M... Person, SCL... Scanning line. Sub-Agent Patent Attorney Tadashi Tsukamoto Fumiyo Figure 2 (J) (4) 1-t

Claims (1)

[Scope of Claims] An image buffer that stores steady-state fixed images obtained by a television camera, an image memory that constantly inputs video signals obtained from the television camera, and image signals of the image buffer and images of the image memory. An abnormal situation detection device comprising: an arithmetic circuit that subtracts one of the signals from the other; a receiver that displays an image based on the output of the arithmetic circuit; and an alarm circuit that issues an alarm.