JP2002216260A - Intruder detection device - Google Patents

Abstract

(57) [Problem] To reliably detect an intruder by distinguishing disturbance light into a monitoring area from an intruder. An intruder detection device including a light-emitting element that emits near-infrared light toward a dark monitoring area. The intruder detection apparatus includes background image data and monitoring image data obtained by imaging the monitoring area with an imaging unit. When detecting the presence or absence of an intruder based on the intruder candidate, the intruder detection unit 9 determines that there is an intruder candidate when the first detection result when the light emitting element 1 is turned on has a change,
When it is determined that there is an intruder candidate, the light emitting control unit 2 is instructed to turn off the light emitting element 1, and when the second detection result when the light emitting element 1 is turned off shows no change, the intruder is determined to be present. Then, when the second detection result indicates a change, it is determined that the light is disturbance light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intruder detecting apparatus for detecting the presence or absence of an intruder based on image data obtained by capturing an image of a monitoring area with a monitoring camera, and more particularly to a dark monitoring area. And a light-emitting element that emits near-infrared light.

[0002]

2. Description of the Related Art Conventionally, in this type of intruder detection device, a surveillance camera compares background image data when there is no intruder in a monitoring area and surveillance image data when monitoring whether or not there is an intruder. Imaging, comparing the difference between the background image data obtained by this imaging and the monitoring image data with a binarization threshold to obtain binarized image data, and based on this binarized image data, The presence or absence was detected.

[0003]

However, in the conventional intruder detection device, disturbance light to the monitoring area cannot be distinguished from the intruder, and a monitoring image obtained by imaging the monitoring area with a monitoring camera. However, there is a problem in that even if the light changes due to the influence of disturbance light such as light coming from a window, it is determined to be an intruder.

Accordingly, in the present invention, in order to solve the above-mentioned problems, there is provided an intruder detection device capable of reliably detecting an intruder by distinguishing disturbance light into a monitoring area from an intruder. It is an object.

[0005]

In order to achieve the above object, a light-emitting element that emits near-infrared light toward a dark monitoring area, a light-emitting control unit that controls turning on and off of the light-emitting element, An imaging unit that captures an image of an area, a background image memory that stores background image data when there is no intruder in the monitoring area obtained by the imaging of the imaging unit,
A monitoring image memory for storing monitoring image data for monitoring whether or not an intruder is present in the monitoring area obtained by the imaging by the imaging unit; a background image data stored in the background image memory; A difference calculation unit that calculates a difference between the monitoring image data stored in the image memory and outputs difference image data, and a binarization that compares the difference image data with a binarization threshold and outputs binarized image data A processing unit, an intruder detection unit that detects an intruder based on the binarized image data, and a reporting unit that reports when an intruder is detected by the intruder detection unit, the light emission control unit includes: Controlling the lighting / extinguishing of the light emitting element according to an instruction from the intruder detecting unit, the intruder detecting unit detects the first detection result when the light emitting element is turned on, and turns off the light emitting element. And the second detection result when It was to detect the intruder Zui.

[0006] The image processing apparatus further includes a binarization threshold setting unit for changing the setting of the binarization threshold, and the binarization threshold setting unit sets the binarization threshold according to an instruction from the intruder detection unit. (1) Change to a binarization threshold or a second binarization threshold, and the binarization processing section compares the difference image data with the first binarization threshold when the light emitting element is turned on. When the light emitting element is turned off, the difference image data is compared with the second binarization threshold to output the binarized image data.

The intruder detecting section determines that there is an intruder candidate when the first detection result indicates a change, and when the first intruder candidate determines that there is an intruder candidate, the light emission control section outputs the light emission control section. An instruction to turn off the element is issued, and when the second detection result shows no change, it is determined that an intruder is present.

The intruder detection section may calculate an area value of a portion having a change from the binary image data, and may compare the area value with a first threshold value to determine the first value.
A first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold value and outputs the second detection result.

Further, the intruder detecting section includes a position extracting section for extracting position data of a changed portion from the binary image data, and the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the difference calculation unit, the difference calculation unit is based on the position data when the light emitting element is turned off. Thus, a difference between the background image data and the monitoring image data is calculated for a portion that has changed when the light emitting element is turned on.

The background image memory stores a first background image data when the light emitting element is turned on.
A background image memory, and a second memory when the light emitting element is turned off.
A second background image memory for storing background image data, wherein the intruder detection unit determines that the intruder candidate is present when the first detection result indicates a change, and determines that the intruder candidate is present in the first period. In this case, the light emission control unit is instructed to turn off the light emitting element, and the difference calculation unit is instructed to calculate a difference between the second background image data and the monitoring image data, and the second detection result is output. When there is no change, the intruder is determined to be present.

The intruder detecting section calculates an area value of a portion having a change from the binary image data, and compares the area value with a first threshold value.
A first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold value and outputs the second detection result.

Further, the intruder detecting section includes a position extracting section for extracting position data of a portion having a change from the binary image data, and the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the difference calculation unit, the difference calculation unit is based on the position data when the light emitting element is turned off. Thus, a difference between the second background image data and the monitoring image data is calculated for a portion that has changed when the light emitting element is turned on.

In addition, the apparatus further comprises a luminance extracting unit for extracting a luminance level of each pixel of the monitoring image data, wherein the intruder detecting unit determines that there is an intruder candidate when the first detection result indicates a change. When it is determined that there is an intruder candidate in the first period, the light emission control unit is instructed to turn off the light emitting element, and the binarization processing unit compares the luminance level with the binarization threshold to perform binarization. It is instructed to output as image data, and when the second detection result shows no change, it is determined that there is an intruder.

The intruder detector may calculate an area value of a portion having a change from the binarized image data, and may compare the area value with a first threshold to determine the first value.
A first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold value and outputs the second detection result.

Further, the intruder detecting section includes a position extracting section for extracting position data of a changed portion from the binarized image data, and the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the luminance extraction unit, the luminance extraction unit is based on the position data when the light emitting element is off. Then, the luminance level of each pixel of the monitoring image data is extracted for a portion where there is a change when the light emitting element is turned on.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a main block diagram showing a first embodiment of an intruder detection device according to the present invention. Reference numeral 1 denotes a light-emitting element that emits near-infrared light toward a dark monitoring area, for example, an LED. Reference numeral 2 denotes a light-emitting control unit that controls turning on and off of the light-emitting element 1. Reference numeral 4 denotes an A / D converter that converts a video signal output from the imaging unit 3 into a digital signal. Reference numeral 5 denotes a background that stores background image data when there is no intruder in the monitoring area obtained by imaging by the imaging unit 3. A monitoring image memory for storing monitoring image data for monitoring whether or not an intruder is present in a monitoring area obtained by imaging by the imaging unit;
Reference numeral 7 denotes a difference calculation unit that calculates a difference between the background image data stored in the background image memory 5 and the monitoring image data stored in the monitoring image memory 6 and outputs the difference image data. A binarization processing unit 9 for outputting binarized image data as compared with the intruder detection unit 9 for detecting an intruder based on the binarized image data;
And a notification unit 16 for changing the setting of the binarization threshold.

The operation of the intruder detecting apparatus according to the first embodiment of the present invention will be described in detail. The control unit (not shown) turns on the light emitting element 1 and emits near-infrared light toward the monitoring area so that the image of the dark monitoring area is captured by the imaging unit 3. First, the background image data when the light emitting element 1 is turned on and there is no intruder in the monitoring area is captured by the imaging unit 3.
The background image data obtained by this imaging is stored in the background image memory 5. Detection of an intruder is performed as follows. When the light emitting element 1 is turned on and monitoring image data for monitoring whether an intruder is present in the monitoring area is captured by the imaging unit 3, the monitoring image data obtained by this imaging is stored in the monitoring image memory 6. Remember. The background image memory 5 in the difference calculation unit 7
The difference between the background image data stored in the monitor image data and the surveillance image data stored in the surveillance image memory 6 is calculated and the difference image data is output. (1) Binary image data is obtained by comparing with a binarization threshold. The intruder detection unit 9 determines a first detection result when the light emitting element 1 is turned on based on the binarized image data, and determines the light emission control unit 2 when the first detection result indicates a change. , And instructs the binarization threshold setting unit 16 to change the setting of the binarization threshold to be compared with the difference image data in the binarization processing unit 8. The light emission control unit 2 receives the light from the light emitting element 1
Is turned off, and the light emitting element 1 is turned off. When the light emitting element 1 is turned off and monitoring image data for monitoring whether an intruder is present in the monitoring area is captured by the imaging unit 3, the monitoring image data obtained by this imaging is stored in the monitoring image memory 6. Remember. Subsequently, in the same manner as described above, the difference calculator 7 calculates the difference between the background image data stored in the background image memory 5 and the monitoring image data stored in the monitoring image memory 6 and outputs the difference image data. The binarization processing unit 8 compares the difference image data output from the difference calculation unit 7 with a second binarization threshold changed according to an instruction from the intruder detection unit 9 to obtain binarized image data. The intruder detection unit 9 determines a second detection result when the light emitting element 1 is turned off based on the binarized image data, and detects an intruder when the second detection result shows no change. Is determined, and the notification unit 10 notifies that the intruder has been detected. Further, when the second detection result indicates that there is a change, the intruder detection unit 9 determines that the monitoring image obtained by imaging the monitoring area by the imaging unit 3 is affected by disturbance light such as light emitted from a window. Judge that it has changed.

More specifically, when there is an intruder or disturbance light, the first detection result indicates a change. When the light emitting element 1 is turned off, in the case of an intruder, the intruder does not appear in the monitoring image data obtained by the imaging of the imaging unit 3, and the second detection result does not change.
In the case of disturbance light, even if the light emitting element 1 is not turned on,
Disturbance light is reflected in the monitoring image data obtained by the imaging of the imaging unit 3, and the second detection result indicates a change.

As described above, the intruder detection unit 9
If the first detection result when the light emitting element 1 is lit indicates a change, it is determined that there is an intruder candidate, and the light emission control unit 2
Is instructed to turn off the light emitting element 1, and if the second detection result when the light emitting element 1 is turned off shows no change, it is determined that an intruder is present. Light can be distinguished from light, and intruder detection can be reliably performed.

In the above-described embodiment, the difference calculation unit 7 calculates the difference between the background image data stored in the background image memory 5 and the monitoring image data stored in the monitoring image memory 6 for all pixels (in units of a plurality of pixels). (A block may be used as a target), and outputs difference image data. The binarization processing unit 8 compares the difference image data output from the difference calculation unit 7 with a binarization threshold value, and outputs the binary image data. I tried to get. That is, turning on / off the light emitting element 1 causes a change in a portion of the monitoring image data captured by the imaging section 3 where there is no intruder or disturbance light, but emits near infrared rays to a dark monitoring area. The obtained background image data is dark image data, and the monitoring image obtained by stopping the near-infrared ray projection is also dark image data. Therefore, the difference between these two image data is small, and the binarization threshold By changing the setting and binarizing, the changed portion caused by turning on / off the light emitting element 1 is removed.

Next, the configuration and operation of the intruder detection device according to the second embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 2 is a main block diagram showing a second embodiment of the intruder detection device according to the present invention. In the configuration of the first embodiment, the area of a portion that has changed from the binarized image data obtained by the binarization processing unit 8, for example, the binary image data is displayed on the display device (not shown) on the intruder detecting unit 9. An area value calculation unit 11 that calculates an area value obtained as an amount proportional to the number of pixels on the screen by projection or labeling method, and compares the output of the area value calculation unit 11 with a first threshold. A first detection unit 12 that outputs the first detection result described above, and an area value calculation unit 11
A second detection unit 13 that compares the output of the second detection value with a second threshold value and outputs the above-described second detection result.
Was unnecessary. Operations of the above configuration that are different from the operations of the intruder detection device of the first embodiment will be described. The intruder detection unit 9 calculates an area value of a portion having a change from the binarized image data by the area value calculation unit 11, and the first detection unit 12 and the second detection unit 13 respectively use a first threshold value and a second threshold value. In comparison with the threshold values, if there is a change in the area value equal to or more than the first threshold value and the second threshold value, respectively, the first detection result and the second detection result are determined to have changed, and Threshold, second
A changed portion having an area value equal to or smaller than the threshold value is not detected. That is, turning on / off the light emitting element 1 causes a change in a portion of the monitoring image data captured by the imaging section 3 where there is no intruder or disturbance light, but emits near infrared rays to a dark monitoring area. The obtained background image data is dark image data, and the monitoring image obtained by stopping the projection of near-infrared light is also dark image data. Therefore, the difference between these two image data is small, and the first detection unit By changing the first threshold value and the second threshold value, which are compared with the area value, at 12 and the second detection unit 13, a changed portion caused by turning on / off the light emitting element 1 is removed.

Next, the configuration and operation of an intruder detection device according to a third embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 3 is a main block diagram showing a third embodiment of the intruder detection device according to the present invention. In the configuration of the second embodiment, the intruder detection unit 9 extracts position data of a changed portion from the binarized image data obtained by the binarization processing unit 8 and outputs the position data to the difference calculation unit 7. A part 14 was provided. The operation of the above configuration, which is different from the operation of the intruder detection device of the second embodiment, will be described. When the first detection result indicates a change, the intruder detection unit 9 instructs the light emission control unit 2 to turn off the light emitting element 1 and changes the position data from the position extraction unit 14 when the first detection result indicates a change. Output to the calculation unit 7. Then, based on the position data from the position extracting unit 14 when the light emitting element 1 is turned off, the difference calculation unit 7 monitors background image data for a part that has changed when the light emitting element 1 was turned on. The difference from the image data is calculated. That is, turning on / off the light emitting element 1 causes a change in a portion where there is no intruder, disturbance light, or the like in the monitoring image data picked up by the image pickup unit 3, but determines that there is a change based on the first detection result described above. By paying attention to the changed portion, a changed portion caused by turning on / off the light emitting element 1 is removed.

Next, the configuration and operation of an intruder detecting apparatus according to a fourth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 4 is a main block diagram showing a fourth embodiment of the intruder detection device according to the present invention. In the configuration of the third embodiment, the configuration of the background image memory 5 is the same as that of the first background image memory 5a that stores the first background image data when the light emitting element 1 is turned on.
And a second background image memory 5b for storing the second background image data when the light emitting element 1 is turned off. Then, as described above, the first background image data when the light emitting element 1 is turned on and there is no intruder in the monitoring area is imaged by the imaging unit 3, and the first background image data obtained by this imaging is processed as the first background image data. 1 stored in the background image memory 5a, the light emitting element 1 is turned off,
Further, the second background image data when there is no intruder in the monitoring area is imaged by the imaging unit 3, and the second background image data obtained by this imaging is stored in the second background image memory 5b. In addition,
Either order may be stored in the first background image memory 5a and the second background image memory 5b. Detection of an intruder is performed as follows. When the light emitting element 1 is turned on and monitoring image data for monitoring whether an intruder is present in the monitoring area is captured by the imaging unit 3, the monitoring image data obtained by this imaging is stored in the monitoring image memory 6. Remember. The difference calculation unit 7 calculates a difference between the first background image data stored in the first background image memory 5a and the surveillance image data stored in the surveillance image memory 6 and outputs difference image data. Then, the difference image data output from the difference calculation unit 7 is compared with a binarization threshold to obtain binarized image data. The intruder detection unit 9 determines a first detection result when the light emitting element 1 is turned on based on the binarized image data, and determines the light emission control unit 2 when the first detection result indicates a change. To turn off the light emitting element 1 and instruct the difference calculation unit 7 to calculate the difference between the second background image data stored in the second background image memory 5b and the monitoring image data. The light emission control unit 2 includes an intruder detection unit 9
The light emitting element 1 is controlled to be turned off in accordance with the instruction from, and the light emitting element 1 is turned off. When the light emitting element 1 is turned off and monitoring image data for monitoring whether an intruder is present in the monitoring area is captured by the imaging unit 3, the monitoring image data obtained by this imaging is stored in the monitoring image memory 6. Remember. Then, the difference calculation unit 7
Calculates the difference between the second background image data stored in the second background image memory 5b and the surveillance image data stored in the surveillance image memory 6 based on an instruction from the intruder detection unit 9 and outputs the difference image data Then, in the binarization processing unit 8, the difference calculation unit 7
Is compared with a binarization threshold to obtain binarized image data. The intruder detection unit 9 determines a second detection result when the light emitting element 1 is turned off based on the binarized image data, and detects an intruder when the second detection result shows no change. Is determined, and the notification unit 10 notifies that the intruder has been detected. Further, when the second detection result indicates that there is a change, the intruder detection unit 9 determines that the monitoring image obtained by imaging the monitoring area by the imaging unit 3 is affected by disturbance light such as light emitted from a window. Judge that it has changed.

In the above-described embodiment, in order to determine the second detection result when the light emitting element 1 is turned off, the difference calculation unit 7
The difference between the second background image data stored in the second background image memory 5b and the surveillance image data stored in the surveillance image memory 6 is calculated to output difference image data. That is, turning on / off the light emitting element 1 causes a change in a portion of the monitoring image data captured by the imaging unit 3 where there is no intruder or disturbance light.
The background image data is stored in the second background image memory 5b, and the difference between the light emitting element 1 and the monitoring image data when the light emitting element 1 is turned off is calculated. It was not taken in.

Next, the configuration and operation of an intruder detecting apparatus according to a fifth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 5 is a main block diagram showing a fifth embodiment of the intruder detection device according to the present invention. In the configuration of the third embodiment, there is provided a brightness extraction unit 15 for extracting the brightness level of each pixel of the monitoring image data stored in the monitoring image memory 6 and outputting this brightness level to the binarization processing unit. The operation of the above configuration, which is different from the operation of the intruder detection device of the third embodiment, will be described. The intruder detection unit 9 instructs the light emission control unit 2 to turn off the light emitting element 1 when the first detection result is changed, and instructs the binarization processing unit 8 to extract luminance. The luminance level from the unit 15 is compared with a binarization threshold value, and an instruction is issued to output the binarized image data. The position extraction unit 14 outputs position data to the luminance extraction unit 15. Then, when the light emitting element 1 is turned off, the luminance extracting unit 15 outputs the luminance based on the position data from the position extracting unit 14.
The luminance level of each pixel of the surveillance image data stored in the surveillance image memory 6 is extracted for a portion that has changed when the light emitting element 1 is lit, and the binarization processing unit 8 The luminance level is compared with a binarization threshold and output as binarized image data.

[0026]

As described above, according to the intruder detection device provided with the light emitting element which emits near-infrared rays toward a dark monitoring area, the monitoring area is captured by the monitoring camera. When detecting the presence or absence of an intruder, it is determined that the surveillance image obtained by imaging the surveillance area with the surveillance camera has changed due to the influence of disturbance light such as light emitted from a window, and the By distinguishing light from intruders,
Intruder detection can be performed reliably.

[Brief description of the drawings]

FIG. 1 is a main block diagram showing a first embodiment of an intruder detection device according to the present invention.

FIG. 2 is a main block diagram showing a second embodiment of the intruder detection device according to the present invention.

FIG. 3 is a main block diagram showing a third embodiment of the intruder detection device according to the present invention.

FIG. 4 is a main part block diagram showing a fourth embodiment of the intruder detection device according to the present invention.

FIG. 5 is a main part block diagram showing a fifth embodiment of the intruder detection device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitting element 2 light emission control unit 3 imaging unit 4 A / D conversion unit 5 background image memory 5 a first background image memory 5 b second background image memory 6 monitoring image memory 7 difference calculation unit 8 binarization processing unit 9 intruder detection Unit 10 notification unit 11 area value calculation unit 12 first detection unit 13 second detection unit 14 position extraction unit 15 luminance extraction unit

Claims (11)

[Claims] A light-emitting element that emits near-infrared light toward a dark monitoring area; a light-emitting control unit that controls turning on and off of the light-emitting element; an imaging unit that captures an image of the monitoring area; A background image memory for storing background image data when there is no intruder in the monitoring area obtained by the imaging of the image capturing unit; and determining whether there is an intruder in the monitoring area obtained by the imaging of the imaging unit. A monitoring image memory for storing monitoring image data for monitoring, and a difference for calculating a difference between the background image data stored in the background image memory and the monitoring image data stored in the monitoring image memory and outputting the difference image data An arithmetic unit, a binarization processing unit that compares the difference image data with a binarization threshold and outputs binarized image data, and an intruder detection unit that detects an intruder based on the binarized image data And before A notification unit for notifying when an intruder is detected by the intruder detection unit, wherein the light emission control unit turns on / off the light emitting element according to an instruction from the intruder detection unit.
Controlling the extinguishing, the intruder detecting unit detects an intruder based on a first detection result when the light emitting element is turned on and a second detection result when the light emitting element is turned off An intruder detection device characterized in that: 2. The image processing apparatus according to claim 1, further comprising a binarization threshold setting unit configured to change a setting of the binarization threshold, wherein the binarization threshold setting unit sets the binarization threshold according to an instruction from the intruder detection unit. (1) Change to a binarization threshold or a second binarization threshold, and the binarization processing section compares the difference image data with the first binarization threshold when the light emitting element is turned on. And outputting the binarized image data by comparing the differential image data with the second binarization threshold when the light emitting element is turned off. Item 4. The intruder detection device according to Item 1. 3. The intruder detection unit determines that there is an intruder candidate when the first detection result indicates a change, and when the intruder candidate determines that there is an intruder candidate, the light emission control unit causes the light emission control unit to emit the light. 3. The intruder detection apparatus according to claim 1, wherein an instruction to turn off the element is issued, and when the second detection result shows no change, it is determined that an intruder is present. 4. An intruder detection unit, comprising: an area value calculation unit configured to calculate an area value of a part having a change from the binary image data; and comparing the area value with a first threshold value to determine the first value. The apparatus according to claim 1, further comprising: a first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold value and outputs the second detection result. 3. The intruder detection device according to 3. 5. The intruder detecting section includes a position extracting section for extracting position data of a changed portion from the binary image data, wherein the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the difference calculation unit, the difference calculation unit is based on the position data when the light emitting element is turned off. 5. The method according to claim 1, wherein a difference between the background image data and the monitoring image data is calculated for a portion that has changed when the light emitting element is turned on. 6. Intruder detection device. 6. The background image memory stores a first background image data when the light emitting element is turned on, and a second background image data when the light emitting element is turned off. A second background image memory, wherein the intruder detection unit determines that the intruder candidate is present when the first detection result is changed, and determines the emission control when the first intruder candidate is determined to be present. And instruct the unit to turn off the light emitting element, and instruct the difference calculation unit to calculate the difference between the second background image data and the monitoring image data, and when the second detection result shows no change. The intruder detection device according to claim 1, wherein the intruder is determined to be present. 7. An intruder detection unit, comprising: an area value calculation unit configured to calculate an area value of a part having a change from the binary image data; and comparing the area value with a first threshold value to determine the first value. 7. The intrusion according to claim 6, further comprising: a first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold and outputs the second detection result. Person detection device. 8. The intruder detecting section includes a position extracting section for extracting position data of a changed portion from the binary image data, wherein the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the difference calculation unit, the difference calculation unit is based on the position data when the light emitting element is turned off. 8. The method according to claim 6, wherein a difference between the second background image data and the monitoring image data is calculated for a portion changed when the light emitting element is turned on. Intruder detection device as described. 9. An intruder detecting unit, comprising: a luminance extracting unit that extracts a luminance level of each pixel of the monitoring image data;
When the first detection result indicates that there is a change, the intruder candidate is determined to be present, and when it is determined that the intruder candidate is present, the light emission control unit is instructed to turn off the light emitting element,
Instruct the binarization processing unit to compare the luminance level with the binarization threshold and output as binarized image data, and determine that the intruder is present when the second detection result shows no change 2. The intruder detecting device according to claim 1, wherein the intruder is detected. 10. The intruder detection unit calculates an area value of a portion having a change from the binary image data, and compares the area value with a first threshold to determine the first value. 10. The intrusion according to claim 9, further comprising: a first detection unit that outputs a detection result; and a second detection unit that compares the area value with a second threshold value and outputs the second detection result. Person detection device. 11. The intruder detecting section includes a position extracting section for extracting position data of a portion having a change from the binary image data, and the intruder detecting section has a change in the first detection result. In the case of, while instructing the light emission control unit to turn off the light emitting element, and outputting the position data to the luminance extraction unit, the luminance extraction unit is based on the position data when the light emitting element is off. 11. The intruder according to claim 9, wherein a luminance level of each pixel of the monitoring image data is extracted from a portion that has changed when the light emitting element is turned on. Detection device.