JPS62162197A - Invasion detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an intrusion detection device for detecting the presence or absence of a predetermined intruding object within a predetermined monitoring area. A device that detects an intruder and outputs an appropriate alarm signal when there is an intruder within a monitored area has been put into practical use. Conventional equipment for this system uses a first sound sensor, an infrared sensor, a pressure-sensitive sensor installed under the floor, etc. alone or in combination. , these sensors detect the blocking of infrared rays from the No. 12 wave by an intruder or the weight placed on the floor by an intruder, and detect whether or not there is an intruder within the monitored area0 (Invention However, among these conventional devices, those that use ultrasonic waves and infrared rays are able to detect whether some object exists or has entered the monitoring area. However, if, for example, a small animal other than a human wanders into the monitored area or the curtains in the room shake, the device will activate in response and generate a false alarm. There are problems.

Furthermore, the present invention is applicable to a device configured to emit infrared rays or ultrasonic waves to a monitoring area and detect the reflected waves generated when these radiated waves hit an intruder using an infrared sensor or an ultrasonic sensor to detect the presence of an intruder. In order to improve reliability, if two or more devices are installed in the same monitoring area, these devices will interfere with each other and normal monitoring operations cannot be expected. are doing.

In addition, when the monitoring area is relatively wide, if mutual r
If you try to arrange multiple devices so that they do not interfere,
Another problem is that it creates a blind spot and significantly reduces reliability.

On the other hand, devices using pressure-sensitive sensors do not have the problem of mutual interference as described above, but they also activate when a small animal enters the monitoring area, and the device is detected separately from an intruder. The problem is that it is difficult to

Therefore, an object of the present invention is to enable a plurality of devices to be installed within the same monitoring area without problems of mutual interference, and to ensure that a predetermined intruding object is detected while being distinguished from other objects. An object of the present invention is to provide an intrusion detection device capable of detecting intrusion detection.

(Means for Solving the Problems) The content of the present invention for achieving the above object is that photoelectric conversion elements electrically connected in the forward and reverse directions are arranged in four required turns on a plane. a photoelectric conversion device that outputs a first signal indicating the output sum of the forward direction photoelectric conversion element and a second signal indicating the output sum of the backward direction optical ML conversion element; an optical device for forming an image on a predetermined surface of the device; and an optical device responsive to the first and second signals;
and a difference signal output circuit that outputs a difference signal according to the difference in the feed value of each level of the second signal, and first data that indicates the moving speed of the object moving within the monitoring field of view based on the difference signal. a first calculation means for outputting, a second calculation means for outputting second data indicating the size of the object based on the difference signal, and a second calculation means for outputting second data indicating the size of the object based on the difference signal; and a second calculation means for moving within the monitoring field in response to the first and second data. The present invention is characterized in that it comprises a determining means for determining whether or not a predetermined intruding object is within the monitoring field of view based on the movement, speed and size of the object.

(Operation) If there are no moving objects such as intruders or other small animals within the desired monitoring area, the moving speed indicated by the first data is zero, and the size measurement by the second calculation means is Not done. - If there is any moving object within the force, monitoring field of view, its moving speed and size are measured in the first and second control sections, respectively, and the results are output as first and second data. The determining means is the first
In response to the second f-th, it is determined from the moving speed and size of the intruding object whether or not the object moving within the monitoring field of view is a predetermined intruding object. For example, if the object that has entered the surveillance field of view is a mouse, and a human is scheduled as the predetermined intruding object, the mouse's moving speed is relatively faster than that of the human, and its size is υ is also sufficiently small, so by determining the contents of the first and second data according to the criteria based on the above explanation, it is possible to reliably detect whether or not the Iruma has entered the monitoring field of view.

(Embodiment) FIG. 1 shows a block diagram showing an embodiment of an intrusion detection device according to the present invention. The intrusion detection device 1 in this embodiment is configured to be able to reliably detect whether or not an intruder 3 is present within a preset monitoring field of view 2, distinguishing it from intrusion by small animals other than humans. The intrusion detection device 1 includes a photoelectric sensor 8 in which a photoelectric conversion device 7 is disposed within an optical device 6 that includes a housing 5 equipped with a lens 4 .

The photoelectric conversion device 7 includes a light display board 9, and its photoelectric conversion surface 9a is divided into a number of vertical and horizontal sections as shown in FIG. Conversion elements 10 are arranged according to a predetermined pattern.

In the illustrated embodiment, the light '@ conversion element 10 includes a plurality of positive direction photoelectric conversion elements (indicated by the symbol +) connected in the positive direction with respect to the common connection line 11 and The positive and negative direction photoelectric conversion elements are arranged in a two-dimensional M series and are arranged in a second direction on the charging conversion surface 9a.
Arranged as shown in the figure.

The arrangement of the charging conversion elements shown in FIG. 2 is an example, and the arrangement of the photoelectric conversion elements of the photoelectric conversion device used in the present invention is not limited to the arrangement pattern shown in FIG. 2, and constitutes a so-called spatial filter. Any array that can do that is fine.

The forward direction photoelectric conversion elements are all connected in parallel and each cathode is connected to a common terminal [11],
Each anode is connected to a terminal 10a. On the other hand, all the negative direction photoelectric conversion elements are connected in parallel, each cathode is connected to the common line 11, and each anode is connected to the terminal 10b.

Load resistors 12 and 13 are connected between terminals 10a and 10c and between terminals 10b and 10c, respectively. Therefore, each output current from the forward direction photoelectric conversion elements connected in the positive direction with respect to the common connection line 11 flows into the load resistor 12, so that the output currents correspond to the sum of the outputs of the forward direction photoelectric conversion elements. A first signal vl of the same level is generated across the load resistor 12. On the other hand, each output current from the negative direction photoelectric conversion elements connected in the negative direction with respect to the common connection line 10 flows into the load resistor 13. A second signal v2 of the same level is generated across the load resistor 13.

As is already known, this photoelectric conversion plate 9 changes when the light* is uniformly applied to the surface 9a, or when a stationary/J-turn is projected onto the photoelectric conversion surface 9a. The absolute value of each level of the first signal v1 and the second signal v2 is approximately equal, and when the pattern projected on the photoelectric conversion surface 9a changes, it is taken as a positive level t= sign. The sum of the first signal v1 and the second signal V2, which is taken out as a negative level signal, changes to positive or negative in relation to the change.

Returning to FIG. 1, in order to obtain a signal corresponding to the absolute difference of each level between the first signal V and the second multiple V2, the first signal V
, and the second signal v2 are the ground terminal G and the input terminal 14 of the difference signal output circuit 14 configured as a differential amplifier circuit.
& and between the ground terminal G and the one input terminal 14b, respectively, and the difference signal output circuit 14 outputs the difference in the absolute value of each level between the first signal v1 and the second signal v2. The difference signal V3 (=IVt l
-1V21) is output. FIG. 4 shows an example of a level change in the difference signal v3 caused by the movement of the intruder 3. The difference signal v3 is converted to an analog to dizotal converter (
A/l)) 15, where the difference signal V3 is converted into the corresponding digital output data D.

Focusing on the fact that the level of the difference signal v3 changes between positive and negative depending on the movement state of the intruder 3, digital output data D is used to extract information regarding the mobility of the intruder 3 from the level change state of the difference signal v3. outputs first data DT indicating the mobility of an object moving within the monitoring field of view 2.
It is input to the calculation unit 16.

The first performance unit 16 has a fast Fourier transform calculation unit 17 to which the digital output data D is input, and here, the fast Fourier transform calculation based on the digital output data D is performed using a predetermined method. This is done every predetermined time slot.

The results of this calculation are obtained as frequency analysis data as shown in FIG. It is input to the J-event processing section 18. The first data processing section 18 performs calculations to obtain data indicating 4#1 degrees of the intruder 3 based on the frequency spectrum pattern of the difference signal v3 indicated by the data F. The data F is input to the peak value detection section 19, where the maximum level frequency component indicated by the data F is detected, and the detection data MF indicating this detected frequency is input to the first data conversion section 20.

The first reference data RD necessary for converting the detection data MF into data indicating the current mobility of the intruder 3, that is, the speed! In order to provide the first data converter 20 with
The data processing section 18 includes a first memory section 21 . When the field of view 2 to be monitored is determined by the photoelectric sensor 8, an object of a size corresponding to the expected intruder is moved within this field of view 2 at various speeds known in advance. The configuration is such that data SD indicating the relationship between the detected speed and the detected data MF can be input from the first human power device 22 to the first memory section 21.

Therefore, the content of the first reference data RDl, which depends on the type of photoelectric sensor 8, the installation state, etc., can be freely rewritten using the first human power device 22, and the data conversion in the first data converter 20 can be changed. It can be done with high precision. The first data converter 20 outputs a 17'-timer DT1 indicating the moving speed of the intruder 3.

The level of the difference signal v3 changes between positive and negative depending on the movement state of the intruder 3, and the characteristic of the value of the autocorrelation function over time, which numerically shows the change in level and the state of the two turns, is determined by the size of the intruder 3. In order to measure the size of the intruder 3 by paying attention to the fact that the size of the intruder 3 has a close correlation with the previous signal v3, the digital output data D corresponding to the preceding signal v3 is input to the second calculation unit 23.

The second calculation unit 23 has an autocorrelation function calculation unit 24 to which the digital output data D is input, and an autocorrelation function value based on the digital output data D is calculated here. The calculation of the autocorrelation function value is performed for the level pattern of the difference signal over a predetermined time length, and this calculation is repeated at predetermined time intervals.

The function value data FD indicating the calculation result in the autocorrelation function calculation unit 24 is further input to the decrease time measurement unit 26 in the second data processing unit 25, where it is decreased until the value of the autocorrelation function almost decreases. Time is calculated. Time data TD indicating this decrease time is taken out from the decrease time measurement unit 26 as data including information regarding the size of the intruder 3,
The data is input to the second data conversion section 27. The second data conversion unit 27 is supplied with second reference data RD from the second memory unit 28, which is necessary for converting the time data TD into a 22nd data DT2 indicating the size of the intruder 3. . The second data converter 27 converts the time data TD into second data DT2 indicating the size of the intruder based on the second reference data RD2.

The second reference data RD2 necessary for the data conversion process executed in the second data conversion unit 27 varies greatly depending on the type of photoelectric sensor 8, the installation state, the type of detected object, etc. , it is necessary to update the second reference data RD to be stored in the second memory unit 28 every time the measurement conditions change. For this reason, this device is equipped with a second human-powered device 29, which moves an object of a predetermined size within its monitoring field of view 2 under the measurement conditions at the time. Detected object size and time data TD
The data thus obtained is input from the second human power device 29 to the second memory section 28 as the second base rate data RD2, and the data is can be stored in. Second data converter 2
The converted data from 7 is output as second data DT2.

A determination unit 30 is provided to determine whether an object moving within the monitoring field of view 2 is a predetermined intruder based on the first and second data I)'rt, DT. . The determining unit 30 includes a speed determining unit 31 that responds to first data DT1 and determines whether the moving speed of the object is within a predetermined moving speed range; The size determining section 32 determines whether the size of the object is within a predetermined range. The moving speed range to be determined by the speed determining section 31 can be set appropriately depending on the purpose of detection, and the range of thickness to be determined by the size determining section 32 can be similarly set appropriately. can.

The speed and size determination units 31 and 32 change the levels of the output lines 31a and 32a to rf(J These output lines 3
1a and 32a are connected to the inputs of the AND gate 33, and therefore, the AND gate 33 is activated only when the moving speed and size of the object that has entered the monitoring field of view 2 are within predetermined ranges, respectively. The level of the output line 33a becomes rHJ.

The signal appearing on the output line 33m of the And Dart 33 is output as a detection signal SD indicating that there is an intruder within the monitoring field of view 2, and the configuration can be such that an appropriate alarm device is activated by this detection signal SD. .

According to the above configuration, when an object enters the monitoring field of view 2, the first data DTl indicating the speed of the object is outputted from the first iflii section 16, and the second data DT2 indicating the size of the object is outputted from the first iflii section 16. 2 is output from the calculation unit 23. The first and second data D T1 + D T2 are
The information is input to the determination unit 30, and it is determined whether the speed and size of the invading object are within predetermined ranges, and if the speed and size of the invading object are within the predetermined ranges. Detection signal SD is output only in this case.

Since this device 1 uses a spatial filter element as a photoelectric conversion device, data processing for detecting the speed and size of an intruding object is simple. 16. It becomes possible to configure all of the second calculation section 32 and the discrimination section 30, and it is also possible to reduce the size of the device.

In the above embodiment, the structure is configured to detect a human entering the predetermined monitoring field of view, but it is also possible to adjust each part so that it detects the intrusion of small animals such as cats and dogs and does not respond to human intrusion. Of course it's a good thing.

Furthermore, the image formed on a predetermined surface of the photoelectric conversion device may be an image based on infrared rays as well as an image based on visible light.

Therefore, the monitoring field of view may be irradiated with infrared rays at night or the like, and an image of the monitoring field of view using the infrared rays may be formed on the photoelectric conversion reverse surface 9a of the photoelectric conversion plate 9. In this case, it is desirable to use an element having a high sensitivity region in the infrared region as the photoelectric conversion element.

(Effects) According to the present invention, as described above, information on the speed and size of an intruding object is obtained from the output signal from the photoelectric conversion device, which is a spatial filter detector, and the type of the intruding object is determined based on this. Therefore, the presence or absence of a predetermined intruding object can be reliably detected with a relatively simple circuit configuration. Also,
Since there is no need to actively radiate ultrasonic waves, etc. within the required monitoring field of view, there is no risk of malfunctions due to mutual interference even if multiple units are installed, and the monitoring area is wide (if this area is It is easily possible to cover with multiple devices,
Furthermore, even when a single monitoring area is monitored from different angles by multiple devices, the problem of mutual interference between devices does not occur at all, and a more reliable intrusion detection system is constructed. I can do it. Furthermore, since the output from the senna is not a video signal, it has another excellent effect in that it can be used without any problems even in places where people's privacy must be protected.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the mobility measuring device according to the present invention, FIG. 2 is an explanatory diagram of the photoelectric conversion surface of the photoelectric conversion plate shown in FIG. 1, and FIG. A circuit diagram of the conversion device, FIG. 4 is a waveform diagram showing an example of the waveform of the difference signal, and FIG.
The diagram is a frequency diagram of the waveform diagram shown in FIG.・Photoelectric conversion device, 9・
...Photoelectric conversion plate, 10...Photoelectric conversion element, 14...
Difference signal output circuit, 16...first calculation unit, 23...second calculation unit, 30...discrimination unit, DT,...first data, DT2...second data. Patent applicant Agent: A.N.T. Research Institute Co., Ltd.
Patent Attorney Masatoshi Takano Figure 2 Figure 3 Figure 4 Figure 5 Shuromaki

Claims (1)

[Claims] 1. Photoelectric conversion elements electrically connected in the forward direction and reverse direction are arranged in a required pattern on a plane, and a first signal indicating the sum of outputs of the forward direction photoelectric conversion elements and the output of the reverse direction photoelectric conversion elements a photoelectric conversion device that outputs a second signal indicating the sum; an optical device that forms an image of a desired monitoring field on a predetermined surface of the photoelectric conversion device; a difference signal output circuit that outputs a difference signal according to the difference between the absolute values of each level of the first and second signals; and first data that indicates the moving speed of an object moving within the monitoring field based on the difference signal. a second calculation means that outputs second data indicating the size of the object based on the difference signal; and a second calculation means that outputs second data indicating the size of the object based on the difference signal; 1. An intrusion detection device comprising: determination means for determining whether or not a predetermined intruding object is within the monitoring field of view based on the moving speed and size of the object.