JPS61195093A - Invasion supervisory device - Google Patents

Abstract

PURPOSE:To discriminate surely an invader from an aperture by providing a window corresponding to an aperture like a window and the peripheral past thereof and detecting the brightness change of the photographing picture of a television camera. CONSTITUTION:When an aperture A like the window and a peripheral part B are photographed and an invader M exists at the outside of a room, a part corresponding to the aperture A is extracted by a window 2a and the brightness change is detected by a means 3a. On the other hand, the brightness change is not recognized at the extracted part of a window 2b and the detecting signal is not generated at a means 3b. Therefore, a means 4 outputs an invasion detecting signal and operates an alarm. Also, when a passenger M' is in the room, the brightness change occurs on the extracted pictures of window 2a and 2b and by both detecting signals of the means 3a and 3b, the invasion detecting signal is not outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an intrusion monitoring device that detects an intruder based on a change in brightness of an image captured by a television camera.

[Background Art 1 Conventionally, this type of intrusion monitoring device detects an intruder based on changes in brightness of images taken by a television camera that photographs an opening such as a window and the surrounding area of the opening. In order to avoid malfunctions due to changes in brightness in areas other than the opening, only the part corresponding to the opening in the image taken by the TV camera is extracted using a window, and the change in brightness of the extracted image prevents intrusion. There was one that was designed to determine the presence or absence of a person. However, in such a conventional example, there is a problem in that the year in which an intruder was detected is output due to the shadow of a person passing by inside the room. In other words, the shadow of a person passing by inside the room and the shadow of an intruder outside the window are detected as the same brightness change through the window.
There was a problem in that false alarms were generated due to the shadow of a person passing by inside the room.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned points, and its purpose is to prevent malfunctions caused by the shadow of a person passing by inside the room, and to prevent intruders from entering through the opening. An object of the present invention is to provide an intrusion monitoring device that can detect intrusions.

[Disclosure of the Invention 1 (Embodiment) Fig. 1 shows an embodiment of the present invention, in which a television for photographing an opening A such as a window and a peripheral area B of the opening A shown in Fig. 2' is shown. A camera 1, a first window 2a that extracts a portion corresponding to the aperture A of an image photographed by the television camera 1, and a second window 2b that extracts a portion corresponding to the periphery of the aperture A. , first and second windows 2
First and second change detection means 3 for detecting changes in brightness of the extracted images extracted at at 2 b; at 3;
b, and intrusion determining means 4 for determining the presence or absence of an intruder based on the outputs of both change detecting means 3a and 3b. However, in the embodiment, since the TV camera 1 photographs the opening A and the surrounding area B from the indoor side to monitor for intruders, the change detection signal is not transmitted from the first change detection means 3a. When a change detection signal is not obtained from the change detection means 3b, the intrusion detection means 4 outputs an intrusion detection signal. On the other hand, if TV camera 1 is monitoring an intruder from outside the room,
When a change detection signal is obtained from the change detection means 3a and a change detection signal is obtained from the change detection means 3b,
An intrusion detection signal may be outputted from the intrusion determining means 5!4.

The operation of the embodiment will be described below. Now, a window-like opening A and the surrounding area B of the opening A are being photographed by the television camera 1 from the inside of the room, and the first and second windows are set as shown by diagonal lines in Fig. 2. has been done. If there is an intruder M outside the room, the situation shown in Fig. 3(a)
An image photographed by the television camera 1 is obtained, and a portion of the image photographed by the television camera 1 corresponding to the aperture A is extracted in the first window 2a; A change in brightness due to a human figure in the extracted image is detected by the first change detection means 3a, and a change detection signal is output. On the other hand, in this case, the change detection means 3b does not output a change detection signal at the second two times F'N: extracted t''image 0 brightness change''. Therefore, the intrusion determining means 4 determines that the figure is outside the room and belongs to the intruder M, and outputs an intrusion detection signal, and this intrusion detection signal drives an alarm lamp or an alarm buzzer. It has become so.

Next, if there is a passing person M' on the indoor side,
), it is possible to obtain captured images as shown in
1st. A change in brightness due to the shadow of a person occurs in the image extracted in the window of tIIJ2. Therefore, change detection signals are output from both change detection means 3 a and 3 b, and intrusion determination means 4 detects both change detection means 3 a and 3 b.
By outputting change detection signals from 3b,
This brightness change is determined to be that of the person M' passing through the room, and no intrusion detection signal is output, so that the intruder M coming from the opening A can be reliably identified. Note that when the television camera 1 is photographing from outside the room, an intrusion detection signal is output when both change detection signals are obtained from both change detection means 3a and 3b.
, - [5! ! Bright effect 1 As described above, the present invention uses a television camera that photographs an opening such as a window and the surrounding area of the opening, and extracts a portion corresponding to the opening from an image photographed by the television camera. A first window, a second window that extracts a portion corresponding to the peripheral area of the opening, and first and second windows that detect changes in brightness of extracted images extracted in the first and second windows, respectively. This system consists of a change detection means for detecting a change in the area, and an intrusion determination means for determining the presence or absence of an intruder based on the output of the surface change detection means. Since it distinguishes whether the object is inside the room or outside, there is no malfunction caused by the shadow of a person passing by inside the room, and the effect is that it can reliably identify intruders coming through the opening. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention, and FIG.
This figure and FIG. 3 are explanatory diagrams of the same operation. 1 is a TV camera, 2a, 2b are windows, 3aw3b
4 is a change detecting means, and 4 is an intrusion determining means.

Claims (1)

[Claims] (1) a television camera that photographs an opening such as a window and the surrounding area of the opening; a first window that extracts a portion corresponding to the opening from an image photographed by the television camera;
a second window that extracts a portion corresponding to the peripheral area of the opening; first and second change detection means that detect changes in brightness of extracted images extracted in the first and second windows, respectively; An intrusion monitoring device comprising an intrusion determining means for determining the presence or absence of an intruder based on the outputs of both change detecting means.