JP3410832B2 - Intrusion monitoring device and intrusion monitoring method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intrusion monitoring device for monitoring intrusion of a suspicious person in a general house or the like.

[0002]

2. Description of the Related Art In recent years, with the improvement of home security systems, an intrusion monitoring device for detecting an intrusion of a suspicious person has been used in a general house. For example, as a technique applicable to such a general house, Japanese Patent Laid-Open No. 61-7
"Security system" disclosed in Japanese Patent No. 7484
There is.

In this security system, a video recorder is activated by a foreign substance detection signal of a sensor that has detected foreign substance intrusion into a monitored place, and a picture taken by a television camera is recorded. By reporting, the presence of an intruder is reported.

According to this security system, it is possible to reliably detect the intrusion of a foreign matter and record an image at the time of the foreign matter intrusion, so that there is an advantage that a post analysis can be easily performed.

[0005]

In the above-described conventional security system, however, there is a problem in that the sensor for detecting foreign matter intrusion must be provided in addition to the television camera, which complicates the equipment. In particular, in order to install the sensor, it is necessary to perform wiring along the ceiling or along the wall, and when installing this sensor at a plurality of locations, the wiring alone becomes quite complicated.

Further, in the above-described conventional security system, when the sensor detects foreign matter intrusion,
Since the report is sent to the monitoring station immediately, even if a legitimate visitor, etc. enters the monitored space, the report is sent, and there is a problem that it cannot be accurately determined whether there is an intruder. It was

The present invention was created in view of the above points, and an object thereof is to detect an intruder without using a sensor and to accurately detect only the intruder. A monitoring device and an intrusion monitoring method are provided.

[0008]

In order to solve the above-mentioned problems, an intrusion monitoring device according to a first aspect of the present invention comprises a video camera for photographing the monitored space and a plurality of predetermined lines included in the monitored space. Assuming detection blocks that are detection lines and each detection line is divided into one or more, a state change for detecting a state change of the detection block between a plurality of frames or fields based on an image captured by the video camera. comprising a detection unit, and a intruders determining section for determining the presence or absence of the intruder based on the transition pattern of state changes of said plurality of detection blocks, the plurality of detection Rye
The first detection line, which is one of the
Located on either or both sides of the detection block and the entrance
It is characterized in that it includes a detection block including a fence .

The intrusion monitoring apparatus according to a second aspect is the intrusion monitoring apparatus according to the first aspect, wherein the state change detecting section extracts a grayscale signal from an output signal of the video camera, and then a grayscale corresponding to the detection line. A gradation processing unit that outputs data, a memory that stores gradation data that is output from the gradation processing unit and that corresponds to a plurality of lines of at least one frame, and a gradation data of a plurality of lines that is stored in the memory A difference calculation unit that reads the same grayscale data of a plurality of lines after a certain predetermined time and calculates the difference, and a data process that detects a state change for each detection block based on the calculation result by the difference calculation unit. And a section.

The intrusion monitoring apparatus according to claim 3 is the intrusion monitoring apparatus according to claim 1 or 2, wherein the video camera is installed at a position slightly higher than the height of the child, and the number of detection lines is three in the horizontal direction. the first detection line at the top is set to include an inlet at approximately the same height as the installation position of the video camera, the second detection line is set to the inlet vicinity, the third detection line Is set near the building in which the entrance is provided.

[0011]

An intrusion monitoring apparatus according to a fourth aspect is the intrusion monitoring apparatus according to the third aspect, characterized in that the setting position of the second detection line can be changed by an operation from the outside.

The intrusion monitoring device according to claim 5 is the device according to any one of claims 1 to 4.
In any one of the above intrusion monitoring devices, the interval between frames for detecting the state change of the detection block can be changed.

According to a sixth aspect of the intrusion monitoring method, a monitored space is photographed by a video camera to obtain a state change between frames for each of a plurality of detection blocks, and the presence or absence of an intruder is determined according to the transition pattern of the state change. Detect and detect block
Is included in the image taken by the video camera
If multiple detection lines are further divided into one or more
At least the entrance, the site near the entrance, and the building
It is characterized by including each of the vicinity of the deo camera .

[0015]

[0016]

According to the present invention, the monitored space is photographed by the video camera, the state change of each detection block of interest is detected, and the transition pattern of this state change, that is, the state change detection is performed. The presence or absence of intruders is determined based on how the blocks are changing. Therefore, since the presence or absence of an intruder is determined based on the image taken by the video camera, the video camera may be installed at a position separated from the monitored space,
The wiring can be minimized when the video camera is installed in a corner of the room where the monitored space is set. In addition, by analyzing the transition pattern of the state change of each detection block, it is possible to know whether a person who has entered the monitored space is coming straight to the front door, is suspicious behavior, etc. Intruders can be detected.

Further, the above-mentioned detection block is a plurality of detection lines, more preferably, each of the first, second and third detection lines is divided into one or a plurality, and the first detection line is divided. It is preferable to set the second detection line in the site near the entrance and the third detection line in the vicinity of the building at substantially the same height as the video camera installed at a position slightly higher than the height of the child. By setting each detection line in this way, it is possible to know the detailed behavior pattern of the person who entered from the entrance,
The above-mentioned intruder can be accurately detected.

Further, it is preferable that the above-mentioned first line includes a detection block including an entrance and a detection block including a fence located on both sides or one side of the entrance. By setting in this way, it is possible to know whether the person who has entered from the entrance is moving to the left or right, and thus more accurate detection is possible.

Further, it is preferable that the setting position of the above-mentioned second detection line can be changed by an operation from the outside. This is because when the distance from the video camera to the entrance or fence changes, it is necessary to appropriately change the second detection line in order to accurately judge whether or not there is a person who has entered the site. By making the setting of the second detection line changeable, a versatile intrusion monitoring device can be realized.

Further, it is preferable that the frame interval for detecting the state change of the detection block described above can also be changed. By properly setting this interval, it is possible to prevent a malfunction, for example, when a passerby momentarily enters the monitored space.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an intrusion monitoring apparatus according to an embodiment of the present invention. For example, a configuration for monitoring a suspicious person who has invaded the front door of a general house is shown.

In the figure, the CCD camera 10 is for taking a picture of a predetermined area at the entrance as a monitored space, and is scanning in the horizontal direction. This CCD camera 10
The composite signal output from the EIA-compliant interlace system is input to the analog-digital (A / D) converter 18 via the sync separation circuit 12, the video amplifier 14, and the low-pass filter (LPF) 16.

FIG. 2 is a diagram showing an example of a monitored space in which an image is taken by the CCD camera 10.

A plan view seen from above is shown in FIG. 3A, and a perspective view is shown in FIG. As shown in these figures, the CCD camera 10 photographs the entrance direction from the building side. FIG. 1C shows an image of the space to be photographed, which is photographed by such an arrangement. There is an entrance at approximately the center of the screen, and both sides of the entrance are blindfolded by a fence from the outside.

The sync separation circuit 12 separates a video signal and a sync signal from the composite signal input from the CCD camera 10, outputs only the video signal to the video amplifier 14, and outputs the sync signal to the counter 20. To do. The counter 20 performs a counting operation in synchronization with the input synchronizing signal, and outputs the count value to the CPU 30.

The LPF 16 passes only the low frequency component of the signal input from the video amplifier 14. Generally, the image signal contains a high frequency noise component. Therefore, by passing through the LPF 16, only the luminance signal necessary for pattern recognition in the image signal is extracted, and the extracted luminance signal is directed to the A / D converter 18 and output. The video amplifier 14 amplifies the luminance signal input from the sync separation circuit 12 to a voltage level required for analog-digital conversion, and outputs it to the LPF 16.

The A / D converter 18 is a video amplifier 1
A predetermined analog-to-digital conversion is performed on the luminance signal amplified by 4 and input from the LPF 16. For example,
When the image for one frame is divided into 24 in the horizontal direction, sampling is performed at a frequency of 378 KHz, and the luminance signal obtained by each sampling is converted into 8-bit digital data. The luminance signal (gradation data) converted into digital data is stored in the first area 24 in the memory 22.
Entered in.

The memory 22 has a second area 26 and a third area 28 in addition to the first area 24. The first area 24 is an area for sequentially storing gradation data for three designated lines in one screen (one frame) at a certain fixed time. The method of designating these three lines will be described later. The second area 26 is an area for transferring and storing the data of the first area 24 before the next gradation data is stored in the first area 24. This transfer work is performed by the CPU 30 or a dedicated circuit described later. The third area 28 is an area for storing difference calculation data of the gradation data stored in each of the first area 24 and the second area 26 and other processing results.

FIG. 3 is a diagram for explaining how to specify the above-mentioned three lines. Line i shown in FIG.
Corresponds to the center position when the CCD camera 10 is installed in a substantially horizontal direction. For example, when the CCD camera 10 is set to a height of 130 cm from the ground, this line i also becomes a height of 130 cm from the ground. This line i is mainly for detecting whether or not an adult person has arrived at the entrance, and it should not be detected even if small animals such as children and dogs and cats that do not reach this entrance come near the entrance. Therefore, it is preferable to set the height above the ground to be equal to or higher than the height of the child.

Note that this 130 cm is not limited, and it may be set based on the average height of the reference age, for example, as an adult.

Line ii is for detecting the entry of a person into the site, and is set near the bottom of the gate on both sides of the entrance. The line iii is for detecting that a person who has entered the site further approaches the front of the building, and is set at a position relatively close to the CCD camera 10.

The CPU 30 controls the input / output of data to / from the memory 32 and controls the entire intrusion monitoring device of this embodiment.
2, a difference calculation section 34, a data processing section 36, and a judgment output control section 38.

The 3-line reading control unit 32 includes a memory 22.
The control for selecting the grayscale data for three lines to be stored in the first area 24 is performed. The sync signal corresponding to each horizontal scanning line is output from the sync separation circuit 12 described above, and the counter 20 performs the counting operation according to the sync signal to perform the count value corresponding to each scanning line. Is being output. The 3-line reading control unit 32 monitors this input count value, and when the count value corresponding to a predetermined line (3 lines) being monitored is input,
An instruction to store the gradation data of that line is sent to the first area 24 of the memory 22. The first area 24 stores the gradation data corresponding to the corresponding scanning line only when a storage instruction is input from the 3-line reading control unit 32.

The difference calculation section 34 includes three lines of grayscale data (current data) stored in the first area 24 and three lines of grayscale data (one data) stored in the second area 26. The difference from the previous data) is calculated and stored in the third area 28 in the memory 22.

The data processing unit 36 detects, based on the difference data calculated by the difference calculating unit 34, whether or not a state change has occurred in a predetermined block unit. For example, as shown in FIG. 3B, the line i of the monitored three lines is further divided into three parts, and each divided part is divided into blocks A,
B and C. The vicinity of the entrance sandwiched between the gates is included in the block B, and the other fences are included in the blocks A or C. Also, the entire line ii is block D, line iii.
Is the whole block E.

The data processing unit 36 detects the state change of each of these five blocks A, B, C, D and E, and stores the state change data of each block in the third area 28 of the memory 22.

The judgment output control unit 38 observes the transition of the state change between the blocks based on the state change data stored in the third area 28 of the memory 22, and detects the intruder and the visitor according to the transition pattern. Is determined. As a result of the determination,
An appropriate instruction is sent to an alarm device 40, a calling device 42, or a monitor device 44, which will be described later.

The timer circuit 46 is activated in response to the activation instruction from the CPU 30, and sends back a time-up signal to the CPU 30 after a lapse of a predetermined time. Further, when the push button switch 48 is pressed during the counting operation, the push button switch 48 is reset and the time-up signal to the CPU 30 is not output.

The alarm device 40 is provided in a separate room indoors, and when there is an intruder (suspicious person), the judgment output control section 3 is provided.
An alarm sound is emitted according to an instruction from 8.

The reading device 42 includes a push button switch 48.
When a button is pressed, a call chime sound is emitted, and when an intercom device is provided, it also has a function of making a call with a handset installed at a front door.

The monitor device 44 is installed at the entrance of the monitor C in response to an ON / OFF instruction from the judgment output control section 38.
The image captured by the CD camera 10 is displayed on the CRT screen or LCD screen.

The second line position setting unit 50 is shown in FIG.
It is for setting the second line ii among the three lines i, ii and iii shown in FIG. In the case of mass-producing the intrusion monitoring device of this embodiment, the line i can be set higher than children and small animals, for example, fixed to 130 cm. Similarly, the height of the CCD camera 10 (for example, 130c
If line m is determined, line iii is also determined.
Can also be fixed and set. However, it is necessary to set the line ii near the bottom of the gate, and if the distance to the gate or the fence changes, it is necessary to change the line ii according to this distance.
Perform by 0.

The cursor display control unit 52 is for displaying the line position desired to be set on the monitor device 44 when the line ii is set by the second line position setting unit 50. When a predetermined operation is performed from the operation panel (not shown) when the cursor displayed on the monitor screen is set to the line position to be set, the second line position setting unit 50 sets the line to which the cursor is set to the line ii. Recognize as.

FIG. 4 is a diagram showing an example of a specific arrangement of the intrusion monitoring device of this embodiment. For example, as shown in the figure, the CCD camera 10 is integrally formed with the intercom in the intercom 60 at the entrance, and the entrance is mounted and fixed so that the entrance can be photographed in the horizontal direction. The intercom 60 also has a push button switch 48 incorporated therein,
When the push button switch 48 is pressed, the above-mentioned timer circuit 46 of FIG. 1 is reset and a predetermined chime sound is emitted to the indoor side.

Further, the monitor device 44 and the alarm device 4
0, the calling device 42 is attached and fixed using a part of the wall panel of the indoor separate room. The configuration other than the CCD camera 10, the push button switch 48, the alarm device 40, the calling device 42, and the monitor device 44 described above is similar to that of the alarm device 4.
0, the calling device 42, and the monitor device 44 are integrally housed in a wall panel in the vicinity thereof, and the distribution of the connection cable is minimized.

The intrusion monitoring system of this embodiment has the above-mentioned configuration, and the detailed monitoring operation will be described below.

FIG. 5 and FIG. 6 are diagrams showing the operation procedure of the intrusion monitoring apparatus of this embodiment, and the operation procedure mainly focusing on the operation of the CPU 30 is shown. Further, FIG. 7 is a diagram showing an example of determination conditions in the determination output control unit 38 in the CPU 30 shown in FIG. Hereinafter, the overall operation of this embodiment will be described in detail with reference to these drawings.

First, an image is captured by the CCD camera 10, and gradation processing is performed by the A / D converter 18, the sync separation circuit 12, the video amplifier 14, and the LPF 16.

For example, the lines i, ii and iii shown in FIG.
In the case of specifying by scanning line unit, it is necessary to output from the A / D converter 18 image data corresponding to about 490 scanning lines that form one frame of the image output from the CCD camera 10 and displayed on the screen. There is.

Also, it is not necessary to obtain image data in pixel units in the horizontal direction, and rough division is performed in the horizontal direction.
The A / D converter 18 may generate image data of a signal corresponding to one scanning line at a sampling rate corresponding to the coarse division number, and output the image data to the memory 22.

In this way, in parallel with the operation of outputting the image data from the A / D converter 18 to the memory 22, the processing by the 3-line reading controller 32 in the CPU 30 is performed.

First, the 3-line reading processing unit 32 sets A /
It is determined whether the image data output from the D converter 18 to the memory 22 corresponds to any one of the three lines i, ii, and iii of interest (step 500). This determination is performed according to the output (count value) of the counter 20 that is performing the counting operation in synchronization with the horizontal synchronizing signal output from the sync separation circuit 12. That is, the counter 20
Causes the count value to be incremented by “1” every time the scanning line captured by the CCD camera 10 advances by one line.
The count value of the counter 20 is “1” corresponding to the second scanning line.
When it becomes “12”, the 3-line reading control unit 32
Recognizing that the image data output from the A / D converter 18 to the memory 22 is of line i,
A positive determination is made in step 500. Similarly, the three-line reading control unit 32 also makes an affirmative determination in step 500 when the count values corresponding to the lines ii and iii are output from the counter 20. In other cases, a negative determination is made and the determination process in step 500 is repeated.

If an affirmative decision is made in step 500, then the third line reading controller 32 issues a storage instruction to the memory 22 (step 501). Merimo 22
Then, only the image data corresponding to the lines i, ii, and iii output from the A / D converter 18 are selected and stored according to the storage instruction.

In this way, the image data for three lines included in a certain frame is stored in the first area 24 of the memory 22, and the image data stored in this first area 24 is stored in the next frame ( (Consecutive frames, or frames extracted at a rate of one in multiple frames)
The image data for 3 lines included in is transferred to the second area 26 before being input to the memory 22 (step 50).
2). This transfer may be performed not only by the CPU 30 as described above but also by a dedicated circuit.
By performing such transfer processing, the image data corresponding to the current frame is stored in the first area 24, and the image data corresponding to the frame stored immediately before is stored in the second area 26. Will be.

Next, the difference calculator 34 in the CPU 30
The difference between the grayscale data for three lines stored in the first area 24 and the grayscale data for three lines stored in the second area 24 are sequentially read while the grayscale data for each same address of each frame is read. Is calculated (step 503). The calculation result is stored in the third area 28 of the memory 22.

Next, the data processing unit 36 causes the third area 28
3 based on the calculation result (difference data) stored in
It is determined whether or not a state change has occurred in each of the five blocks A, B, C, D and E shown in (B) (step 504). When there is no change in the grayscale data for two lines and three lines stored in each of the first area 24 and the second area 26, all the difference data between them is "0".
In this case, the data processing unit 36 detects that all five blocks A to D have no state change. The detection result is stored in the third area 28. When a state change is detected in any of the blocks, the detection result is stored in the third area 28.

FIG. 8 and FIG. 9 are diagrams showing the relationship between a person who has entered from the entrance and three lines i, ii, and iii.
FIG. 9 shows a state of the CD camera 10 as viewed from the entrance direction, and FIG. 9 shows a state of the CD camera 10 as viewed from the lateral direction. As shown by a in these figures, when a person comes out of the fence, the state change occurs only in the block B included in the line i. And
As shown in b, the line is
A state change also occurs in block D of ii. In addition, as shown in c, when you come to the front door, block E on line iii
Also, a state change will occur. Such a state change is detected by the data processing unit 36, and the detection result is stored in the third area 28.

In this way, the processing from the taking-in of the gradation data for the three lines of interest to the detection of the state change of each block is performed for each frame, and the detection result of the state change for each frame is obtained. The data is sequentially stored in the third area 28 of the memory 22.

Further, in parallel with the process of storing the detection result of the state change for each frame in the third area 28 of the memory 22 in this way, the judgment output control unit 38 in the CPU 30 based on the detection result. Processing is performed.

The judgment output control unit 38 observes the status change status of each block stored in the third area 28 for a predetermined time, and determines the transition pattern of the status change (step 505). Then, it is determined whether there is an intruder (step 506) and whether there is a visitor (step 507) according to the determined transition pattern.

When it is judged that there is an intruder, the judgment output control section 38 sends a monitor ON signal to activate the monitor device 44 (step 508), and the CCD camera 10 is displayed from the monitor screen of the monitor device 44. The video of the suspicious person captured by the shooting of is displayed. Further, the judgment output control unit 3
8 activates the alarm device 40 (step 509), and the alarm device 40 emits an alarm sound to notify the intrusion of a suspicious person.

Even if a legitimate visitor is erroneously determined to be an intruder in step 506, if the push button switch 48 is pressed within a certain time thereafter, the above-mentioned alarm device 40 is activated. Do not do

On the other hand, when it is judged that there is a visitor, the judgment output control unit 38 then activates the calling device 42 (step 510), and the calling chime in the room is sounded.

Next, with reference to FIG. 7, a method of determining an intruder and a visitor in the determination output control unit 38 will be described.

The "transition pattern" shown in the left column of FIG. 7 shows how the block in which the state change has occurred changes. The block to which the state change is detected at a certain time is on the left side of the arrow. On the right side, blocks in which a state change is detected after a certain period of time are further shown. "A &
B ”indicates that the state change of the block A and the state change of the block B are detected at the same time.

"Judgment output" shown in the center column of FIG. 7 indicates the state of the signal output from the judgment output control unit 38, and "no signal" indicates the state in which nothing is output.
In addition, “warning” represents an activation instruction of the warning device 40, “monitor ON” represents an activation instruction of the monitor device 44, and “call” represents an activation instruction of the calling device 42.

"Situation determination" shown in the right column of FIG. 7 indicates a situation corresponding to a transition pattern, and a typical situation is illustrated.

Hereinafter, each transition pattern will be described.

(1) The transition pattern shown in "a" is that after the state change occurs in block A or B,
This is the case where a state change occurs in any of B, C, D, and E. The blocks A and C are blocks corresponding to the fence, and it is almost impossible to detect the state change of the block A or C first without detecting the state change of the block B. Therefore, the "decision output" is "no signal". ".

(2) The transition pattern shown in "b" is a case where only the state change of the block B is maintained. This is the case when a pedestrian or vehicle visible outside the entrance is moving,
Since there is no human entry, the "decision output" is "no signal".

(3) In the transition pattern shown in "C", after the state change of block B occurs, blocks A and D, B and D
Alternatively, it is the case where the state changes of C and D occur. In this case, it is conceivable that a person comes in through the entrance and waits for the situation without coming to the block E, and the "judgment output" is set to "warning" and "monitor ON".

(4) The transition pattern shown in "d" is when the states of blocks A and D, B and D or C and D are changed after the states of blocks B and D are changed. . In this case as well, it is similar to the range pattern of “c” described above, and it is possible that a person who entered from the entrance is waiting to see the situation without coming to block E. Monitor ON "
And

(5) The transition pattern shown in "e" is the block A and D, B and D or C and D, and then the block A and D and E, the block B and D and E or the block. This is the case where the state changes of C, D and E occur. In this case, a person who has entered from the entrance further advances to reach the front of the entrance. In this case, it is determined that the visitor is a legitimate visitor, and the “determination output” is set to “call”.

(6) The transition pattern shown in "F" is when the state change occurs in blocks D and E after the state change occurs in block B. Line i with block B
Corresponds to the scanning line viewed from the CCD camera 10 in the horizontal direction, and therefore, if there is a state change in the block B first, then the state change including the blocks A, B, and C should always occur. Since there is almost no pattern, "no signal" is set as the "judgment output".

(7) The transition pattern shown in "G" is when the state change of blocks D, E or D and E is maintained, and in this case, blocks A, B, and C are not included, and thus 130 cm If it is judged that a child or a small animal that does not meet the requirements has entered, the "judgment output" is set to "no signal".

(8) In the transition pattern shown in "H", the state change of blocks B and D is maintained after the state change of blocks A and D and E, B and D and E or C and D and E occurs. In this case, it is determined that there has been an exiter from the entrance, and the “determination output” is set to “no signal”.

(9) In the transition pattern shown in (i), after the state change of blocks A and D and E or the block C and D and E occurs, the state change of blocks A and D or block C and D occurs. That is the case. In this case, it is determined that there is an exiter from the side of the house, and the "determination output" is set to "no signal".

(10) The transition pattern shown in "nu" is when the state changes of all blocks occur at the same time, and when the sun suddenly disappears. Therefore, "judgment output" is changed to "no signal". And

Thus, the intrusion monitoring system of this embodiment is
Line i to separate adults from children or small animals,
Line ii is set to judge the invasion of people into the site, and line iii is set to detect the approach to the front of the entrance.The state change of each of these lines is detected and Detects intruders and legitimate visitors based on transition patterns. Therefore, CCD
It is not necessary to provide a sensor for detecting an intruder in addition to the camera 10 and the like, wiring is minimized, and the construction of the entire facility and the labor of construction can be saved. In addition, an intruder or a legitimate visitor can be accurately detected according to the transition pattern.

Further, the line i is further divided into three blocks A, B and C, and only one block B is made to correspond to the entrance, so that the intruder can be judged more accurately. That is, when an adult person enters the site, the state of the block B is necessarily changed, and the intruder is detected by paying attention to the case where the state of the block B is first changed. Moreover, since the direction after entering can be known, more accurate detection can be performed.

The present invention is not limited to the above embodiments, and various modified embodiments are possible without departing from the scope of the present invention. For example, in the above-described embodiment, the intrusion monitoring device having the entrance of a general house as the monitored space is considered,
It may be a case where one room in the building is used as the monitored space.

Further, in the above-described embodiment, when the timer circuit 46 is activated and the push button switch 48 is depressed within a certain period of time, the alarm device 40 does not emit an alarm sound. The timer circuit 46 may be omitted. For example, when the legitimate visitor or the like operates a push button switch or the like installed outside the monitored space, it is possible to prevent the entire intrusion monitoring device of this embodiment from operating. In this case, if there is a suspicious person who has entered the monitored space without operating the push button switch, an alarm sound is immediately issued from the alarm device 40 and an image of the intruder is displayed on the monitor device 44. Good.

In the above embodiment, three lines are used.
The grayscale data corresponding to i, ii, and iii was extracted to obtain the difference between the frames, but the grayscale data corresponding to 2 lines or 4 lines or more was extracted and the difference between the frames was obtained to determine whether the intruder was an intruder. Whether or not it may be detected.

FIG. 10 is a diagram showing the outline in the case of extracting the gradation data corresponding to two lines. FIG. 7A shows a case where only two lines i and ii except the line iii in this embodiment are used, and it is not possible to accurately discriminate between an intruder and a legitimate visitor, and thus a state change is detected. If the push button switch 48 is pressed within a certain time after, it is determined that the visitor is a legitimate visitor, and if the push button switch 48 is not pressed, it is determined that the visitor is an intruder. Further, FIG. 3B uses a second line extending in the vertical direction in addition to the line i in this embodiment, and if a person coming in from the entrance does not come to the entrance, it is an intruder. If it is coming, it is judged as a legitimate visitor.

Further, in the above-described embodiment, it is assumed that the entrance is near the center and the fences are on both sides thereof as shown in FIG. 2, but the entrance does not necessarily have to be near the center, and it may be on either side. It may be biased. Further, in an extreme case, as shown in FIG. 11, it may be near one end,
In this case, block A is omitted and four blocks B to
A transition pattern may be considered for E.

Further, in the above embodiment, the case where the gate is not provided with the door has been described, but even if the gate is provided regardless of its shape, the block B is first changed by opening and closing the gate. Since it starts from, it is possible to detect based on the above-mentioned operation.

[0088]

As described above, according to the present invention, the monitored space is photographed by the video camera, the state change of each detection block of interest is detected, and the transition pattern of this state change, that is, The presence / absence of an intruder is determined based on how the detection block in which the state has changed is changing. Therefore, the video camera may be installed at a position distant from the monitored space, and in the case where the video camera is installed in the corner of the room where the monitored space is set, the wiring should be minimized. it can. In addition, by analyzing the transition pattern of the state change of each detection block, the person who entered the monitored space,
For example, it is possible to accurately detect the intruder because it is possible to know whether the person is coming straight to the front door, is suspicious, or the like.

The above-mentioned detection block is a plurality of detection lines, more preferably each of the first, second and third detection lines, divided into one or a plurality of lines. The second detection line is set on the site near the entrance and the third detection line is set near the building at the same height as the video camera installed slightly higher than the child's height. By making such settings, it becomes possible to know the detailed behavior pattern of the person who has entered from the entrance, and it is possible to accurately detect the intruder described above.

Further, the above-mentioned first line includes the detection block including the entrance and the detection block including the fences located on both sides or one side of the entrance, so that the person who enters from the entrance moves to the left or right. Therefore, more accurate detection can be performed.

Further, the setting position of the above-mentioned second detection line can be changed by an operation from the outside, and it is possible to realize a versatile intrusion monitoring device.

Further, the frame interval for detecting the state change of the above-mentioned detection block can be changed, and by appropriately setting this interval, for example, when a passerby momentarily enters the monitored space, etc. It is possible to prevent malfunction.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an intrusion monitoring device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a monitored space in which an image is taken by a CCD camera.

FIG. 3 is a diagram for explaining three detection lines.

FIG. 4 is a diagram showing a specific arrangement of the intrusion monitoring device according to the present embodiment.

FIG. 5 is a diagram showing an operation procedure of the intrusion monitoring device of the present embodiment.

FIG. 6 is a diagram showing an operation procedure of the intrusion monitoring device of the present embodiment.

FIG. 7 is a diagram showing an example of determination conditions in a determination output control unit.

FIG. 8 is a diagram showing a relationship between a person who has entered through an entrance and three detection lines.

FIG. 9 is a diagram showing a relationship between a person who has entered through an entrance and three detection lines.

FIG. 10 is a diagram showing a modified example in which there are two detection lines.

FIG. 11 is a diagram showing a modification in which the position of the entrance is changed.

[Explanation of symbols]

10 CCD camera 12 Sync separation circuit 14 Low-pass filter (LPF) 16 video amplifier 18 A / D converter 20 counter 22 memory 24 First Area 26 Second Area 28 Third Area 30 CPU 32 3 line reading controller 34 Difference calculator 36 Data processing unit 38 Judgment output control unit 40 alarm device 42 Calling device 44 Monitor device 46 timer circuit 48 push button switch 50 Second line position setting section 52 Cursor display control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Ishiguro 2-16-20 Shimura, Itabashi-ku, Tokyo Copal Co., Ltd. (72) Inventor Kunio Matsumoto 2-16-20 Shimura, Itabashi-ku, Tokyo Copal Co., Ltd. (56) References JP-A-6-44469 (JP, A) JP-A-2-214989 (JP, A) JP-A-2-61793 (JP, A) JP-A-6-103471 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08B 13/00-15/02 H04N 7/18

Claims (6)

(57) [Claims] 1. A video camera for photographing a monitored space, and a detection block in which a predetermined plurality of lines included in the monitored space are used as detection lines and each detection line is divided into one or a plurality of lines, A state change detection unit that detects a state change of the detection block between a plurality of frames or fields based on an image captured by a video camera, and the presence or absence of an intruder based on a transition pattern of the state change of the plurality of detection blocks. An intruder determination unit that determines whether the first detection line is one of the plurality of detection lines.
Is a detection block including the inlet and both sides of the inlet
Or a detection block containing a fence located on one side
Intrusion monitoring device, characterized in that that. 2. The grayscale processing unit according to claim 1, wherein the state change detection unit outputs a grayscale data corresponding to the detection line after extracting a grayscale signal from an output signal of the video camera, A memory that stores gradation data corresponding to a plurality of lines of at least one frame output from the gradation processing unit; and gradation data of a plurality of lines stored in the memory and a plurality of similar lines after a predetermined time. An intrusion characterized by comprising: a difference calculation unit that reads grayscale data and calculates a difference; and a data processing unit that detects a state change of each detection block based on a calculation result by the difference calculation unit. Monitoring equipment. 3. An apparatus according to claim 1 or 2, wherein the video camera is installed in a position slightly higher than the child's stature, the detection line is three in the horizontal direction, the first detection line at the top Is set so as to include an entrance at substantially the same height as the position where the video camera is installed, the second detection line is set near the entrance, and the third detection line is set near the building where the entrance is provided. An intrusion monitoring device characterized by being provided. 4. The intrusion monitoring device according to claim 3, wherein a setting position of the second detection line can be changed by an external operation. 5. The claim 1-4, intrusion monitoring device, wherein an interval of the frame to perform the state change detection of said detection blocks can be changed. 6. The monitored space is photographed by a video camera to obtain a state change between frames for each of a plurality of detection blocks, the presence or absence of an intruder is detected according to a transition pattern of the state change, and the detection block is , Taken by the video camera
1 or more detection lines included in the image
Divided into multiple parts, at least the entrance and the vicinity of the entrance
The intrusion monitoring method, which includes each of the inside of the site and the vicinity of the video camera .