JP2001118157A - Composite-type sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the abnormality of a detection state by detecting the shield and the dirt of a whole sensor and a sensor part. SOLUTION: A detector 11 detecting the existence of an invader into a monitor area and outputting a detection signal, an image sensor 12 which image-picks up the monitor area and takes in the image of the invader, a light emitting part 13 emitting light to the monitor area at the time of picking up the image, a storage part 14 storing the reference value of brightness, which judges the brightness of the image that the image sensor 12 takes in, a timer 15 clocking first prescribed time which is previously set and a control part 16 emitting the light emitting part 13 at every first prescribed time, taking in the image from the image sensor 12 and judging it to be abnormal when pixels depending on the brightness of the image which is taken in exist much more than the brightness reference value of the storage part 14, are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sensor which is used in a security system or the like and has different detection characteristics of an intrusion detection sensor and an image sensor, and more particularly, detects a sensor unit and the whole sensor. The present invention relates to a composite sensor that realizes prevention of a crafting action that makes it impossible.

[0002]

2. Description of the Related Art Conventionally, as a sensor used in a security system, generally, in order to detect an intruder in an area to be monitored, a passive infrared sensor that detects infrared rays emitted by the intruder is used. A sensor (hereinafter, referred to as a passive sensor) is used. This passive sensor receives infrared rays emitted by the human body and detects the presence or absence of an intruder based on a change in the level of the received light.

[0003]

However, in the conventional passive sensor as described above, if the sensor housing is covered by a shield that does not transmit infrared light, the infrared radiation is blocked and the monitoring area is blocked. Infrared rays entering from the sensor do not reach the detecting element of the sensor, so that even if a human body exists in the monitoring area, it cannot be detected. Further, if the sensor housing is contaminated with dust or the like due to long-term use, or if the sensor housing is intentionally shielded with paint or the like, there has been a problem that the detection cannot be performed as described above.

The present invention has been made in view of the above, and an object of the present invention is to provide a composite sensor that determines an abnormality in a detection state by detecting a shield or a dirt on the entire sensor and the sensor portion. And

[0005]

According to a first aspect of the present invention, there is provided a composite type sensor having a plurality of sensors having different detection principles, wherein a predetermined monitoring area is provided. Imaging means for imaging, a light emitting means for illuminating the monitoring area, a time keeping means for repeating time keeping for a predetermined time from a preset time, and causing the light emitting means to emit light every predetermined time counted by the time keeping means, Control means for outputting an abnormality signal indicating a detection abnormality when an image captured from the imaging means at the same time as light emission by the light emission means includes a predetermined number or more of pixels in a predetermined brightness range. It is.

According to the present invention, a predetermined time (for example,
Every 30 minutes), the light emitting unit emits light, an image is captured by the image capturing unit, and a pixel in a predetermined brightness range among pixels constituting the captured image is, for example, 100 × 10
When there are 8000 or more pixels in the range of the image of 0 pixels, it is determined that the sensor is a shield work, that is, the dirt has been overlaid or is undetectable.

According to a second aspect of the present invention, there is provided a composite type sensor having a plurality of sensors having different detection principles, wherein: an imaging means for imaging a predetermined monitoring area; and a light emitting device for illuminating the monitoring area. Means, timer means for repeating time measurement for a predetermined time from a preset point in time, and the light emitting means emits light at every predetermined time counted by the time measuring means, and is taken in from the imaging means simultaneously with light emission by the light emitting means. If a predetermined number or more pixels of the first brightness or higher are included in the image,
Or, when the image contains a predetermined number or more of pixels having the second brightness or less, the control unit outputs an abnormal signal indicating a detection abnormality.

According to the present invention, the first brightness or the second brightness
Two lightness standards such as lightness of light, light-emitting means emits light at predetermined time intervals (for example, 30 minutes) to capture an image from the image pickup means, and among pixels constituting the captured image, the first lightness or more Is determined to be abnormal when the number of pixels is larger than a predetermined number (when the whole is bright) or when the number of pixels having the second brightness or lower is larger than a predetermined number (when the whole is dark). That is, when an object is being put on the entire sensor housing, the illumination of the light emitting means is reflected on the covered object, and the image becomes very bright. When an object is covered, by utilizing the characteristic that the image becomes completely dark, it is determined whether a shield is made on the sensor (covering work) or whether the dirt is undetectable.

According to a third aspect of the present invention, there is provided a composite sensor having a plurality of sensors having different detection principles, a detecting means for detecting an object present in a predetermined detection area, and a predetermined monitoring. Imaging means for imaging an area, light-emitting means for illuminating the monitoring area, time-measuring means for measuring a predetermined time, and when an object is detected by the detection means, or when an object is detected by the detection means and the When a moving object is detected by an image captured from the imaging unit, the timer unit is activated, and when the timer unit completes the time counting for the predetermined time, the light emitting unit emits light. For the image captured from the imaging means at the same time as the light emission by,
And control means for outputting an abnormal signal indicating a detection abnormality when a predetermined number or more of pixels in a predetermined brightness range are included.

According to the present invention, after the detecting means detects the intruder, after a predetermined time (for example, three minutes) allowing for the sensor modification time has elapsed, the light emitting means is caused to emit light, and an image is captured from the imaging means. Of the pixels constituting the captured image, pixels in a predetermined brightness range, for example, when there are 8000 or more in the range of an image of 100 × 100 pixels, a shield work on the sensor, that is,
It is determined that the covering work has been performed or the stain is undetectable.

According to a fourth aspect of the present invention, there is provided a composite sensor having a plurality of sensors having different detection principles, a detecting means for detecting an object existing in a predetermined detection area, and a predetermined monitor. Imaging means for imaging an area, light-emitting means for illuminating the monitoring area, time-measuring means for measuring a predetermined time, and when an object is detected by the detection means, or when an object is detected by the detection means and the When a moving object is detected by an image captured from the imaging unit, the timer unit is activated, and when the timer unit completes the time counting for the predetermined time, the light emitting unit emits light. For the image captured from the imaging means at the same time as the light emission by,
When pixels equal to or higher than the first brightness are included in a predetermined number or more,
Or, when the image contains a predetermined number or more of pixels having the second brightness or less, the control unit outputs an abnormal signal indicating a detection abnormality.

According to the present invention, the first brightness or the second brightness
After the intruder is detected by the detection means, a predetermined time (for example, 3 minutes) in consideration of the sensor modification time has elapsed after the detection of the intruder by the detection means, the light emission means is caused to emit light, and the image is taken by the imaging means. Of the pixels constituting the captured image, when the number of pixels having the first brightness or higher is larger than a predetermined number (in the case of overall bright) or the number of pixels having the second brightness or lower is higher than the predetermined number When there is a large number of cases (when the whole is dark), it is determined to be abnormal. That is, when an object is being put on the entire sensor housing, the illumination of the light emitting means is reflected on the covered object, and the image becomes very bright. When an object is covered, by utilizing the characteristic that the image becomes completely dark, it is determined whether a shield is made on the sensor (covering work) or whether the dirt is undetectable.

According to a fifth aspect of the present invention, there is provided a composite type sensor having a plurality of sensors having different detection principles, a detecting means for detecting an object present in a predetermined detection area, and a predetermined monitoring. Imaging means for imaging the area, light emitting means for illuminating the monitoring area, first time counting means for repeating time counting of a first time from a preset time, and second time counting for counting a second time Means, when the object is detected by the detection means, or when the object is detected by the detection means and the object is detected by an image captured from the imaging means, the second
Is activated, and when the second timing means completes the timing of the second time, or when the moving object is not detected by the image taken from the detection means and the imaging means, the first When the clocking of the first time by the clocking unit is completed, the light emitting unit is caused to emit light, and the image captured from the imaging unit at the same time as the light emission by the light emitting unit includes a predetermined number of pixels in a predetermined brightness range or more. And control means for outputting an abnormality signal indicating a detection abnormality when included.

According to the present invention, the first time measuring means (for example, 30 minutes) without detecting the object by the detecting means.
Is completed, or the second time (for example, 3
At two timings when the timing of (minute) is completed, the light emitting unit emits light to capture an image from the image capturing unit, and among the pixels constituting the captured image, a pixel in a predetermined brightness range is, for example, 100 × 100 When 8000 or more pixels are present in the range of the pixel image, it is determined that the shield work on the sensor, that is, the cover work has been performed or the stain is undetectable.

According to a sixth aspect of the present invention, there is provided a composite type sensor having a plurality of sensors having different detection principles, a detecting means for detecting an object present in a predetermined detection area, and a predetermined monitor. Imaging means for imaging the area, light emitting means for illuminating the imaging area, first time counting means for repeating time counting for a first time from a preset time, and second time counting for time counting for a second time Means, when the object is detected by the detection means, or when the object is detected by the detection means and the object is detected by an image captured from the imaging means, the second
Is activated, and when the second timing means completes the timing of the second time, or when the moving object is not detected by the image taken from the detection means and the imaging means, the first When the clocking of the first time by the clocking means is completed, the light emitting means is caused to emit light, and a predetermined number of pixels having a brightness equal to or higher than the first brightness are obtained for the image taken from the imaging means simultaneously with the light emission by the light emitting means. And control means for outputting an abnormal signal indicating a detection abnormality when the image includes the predetermined number of pixels having the second brightness or lower.

According to the present invention, when the detecting means detects the intruder and the second predetermined time (for example, three minutes) estimating the sensor modification time has elapsed, and when the detecting means detects the intruder, the detecting means detects the intruder for a predetermined time (for example, 30 minutes). At the two timings when the detection signal is not output even after the elapse of the minute, the light emitting unit is caused to emit light, the image is captured by the imaging unit, and the number of pixels having the first lightness or higher among the pixels constituting the captured image. Is larger than a predetermined number (when the whole is bright) or when the number of pixels below the second brightness is more than a predetermined number (when the whole is dark), it is determined to be abnormal. That is, when an object is being put on the entire sensor housing, the illumination of the light emitting means is reflected on the covered object, and the image becomes very bright. When an object is covered, by utilizing the characteristic that the image becomes completely dark, it is determined whether a shield is made on the sensor (covering work) or whether the dirt is undetectable.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a composite sensor according to the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited by the embodiment.

This combined sensor is installed in a room, a corridor, a ceiling of a specific area, or the like in a financial institution or a store to be guarded, and identifies an intruder by, for example, the above-described passive sensor and the movement or moving direction of a moving object. Is combined with an image sensor using an artificial retinal LSI (specifically, a technique disclosed in Japanese Patent Application Laid-Open No. Hei 10-93358) to detect an intruder and a small work detection signal described later. is there. Hereinafter, each embodiment will be described.

(First Embodiment) FIG. 1 is a block diagram showing a composite sensor according to a first embodiment of the present invention and a system configuration using the sensor. The composite sensor 10 includes a detector 11, an image sensor 12, a light emitting unit 13, a storage unit 14, a timer 15,
A control unit 14.

The detector 11 has a passive sensor for detecting an intruder based on the amount of infrared light emitted by the intruder, and sends a detection signal to the control unit 16 when the intruder is detected. In addition, in the detector 11, instead of a passive sensor, a reflective infrared sensor or an ultrasonic sensor that emits a beam such as infrared rays and detects an intruder from the amount of reflection thereof,
Conventionally used sensors that can detect the presence or absence of an intruder can be used.

The image sensor 12 is an image sensor that captures an image of a monitoring area, and uses an artificial retinal LSI. The image sensor 12 may use an imaging device such as a CCD camera using a charge coupled device (CCD) in addition to the artificial retinal LSI. The light emitting unit 13 uses an LED (LED group) here to illuminate the monitoring area. The light emitting unit 13
May be any device that can illuminate the monitoring area, such as a strobe or a flash, in addition to the LED.

The storage unit 14 stores a threshold value (reference value) of the brightness arbitrarily set in advance. The timer 15 measures a time arbitrarily set in advance. The control section 16 uses a 16-bit microcomputer (CPU), for example, and controls the above-described functional blocks as a whole.

An alarm transmitter 20 is connected to the composite sensor 10 via a control unit 16. That is, when an intruder is detected by the composite sensor 10, the detection signal is sent to the alarm transmitter 20. Further, a system of an alarm buzzer 21 and a monitoring center 25 is connected to the alarm transmitter 20. The monitoring center 25 is located at a remote location communicable with the alarm transmitter 20 via a communication line.

Further, if necessary, a security switching device for enabling or canceling the security state of the monitoring area may be provided near the monitoring area or near the entrance of the building to which the monitoring area belongs. In this case, the security switching device enables transmission and reception of signals with the above-mentioned alarm transmitter 20 or monitoring center 25.

FIG. 2 is a perspective view showing an overview of the composite sensor 10 in FIG. As shown in the figure, a plurality of illumination LEDs 13 are provided around an image sensor 12 using an artificial retinal LSI in a substantially hemispherical housing, and a detector 11 constituted by a passive sensor is provided in the vicinity thereof. Is provided. Here, it is assumed that when an abnormality is recognized in the detector 11, the LED 13 is turned on and the image is captured by the image sensor 12.

Next, a description will be given of the operation of "cover detection", which is a feature of the composite sensor configured as described above and a system configuration using the sensor. Note that “cover detection” refers to a composite sensor as shown in FIG.
For example, it detects an act of disturbing the sensor function by covering with a shield such as a bowl or cloth, or applying paint.

FIG. 3 is a flowchart showing an operation example according to the first embodiment of the present invention. In the figure, when a power supply (not shown) of the composite sensor 10 is turned on, power is supplied to each unit of the composite sensor 10 and the control unit 16 starts operating. The start of the operation is various, for example, when the state changes from the security state to the security release state. First, the timer 15 is activated to start measuring a first set time set in advance (step S11). Then, it is determined whether or not an object is detected in the monitoring area by the detector 11 (Step S12). Here, from the detector 11 to the controller 16
When a detection signal is sent to determine that an object has been detected,
The control unit 16 determines by image processing whether or not the object detected by the detector 11 is moving (step S1).
3).

Here, the detailed processing of step S13 will be described. First, the controller 16 controls the image sensor 12
Then, one image of the monitoring area is captured. Next, the control unit 1
6 measures the brightness of the captured image. Here, it is assumed that the “brightness” is indicated by an average value of brightness or luminance value of each pixel in the image. Next, the control unit 16
Compares the previously obtained brightness of the monitoring area with a brightness reference value (threshold) stored in the storage unit 14 in advance.
This reference value is a value for determining whether or not the light emitting unit 13 illuminates the monitoring area.

At this time, if the brightness of the monitored area is lower than the reference value, the control unit 16 controls the light emitting unit 16 to be turned on. By this control, the light emitting unit 16
Illuminates the surveillance area. On the other hand, when the brightness of the monitoring area is higher than the reference value, the light emitting unit 13 does not emit light. Next, the control unit 16 controls the image sensor 12.
More images of the monitoring area are captured. The images captured here are the number of images obtained during the time when the light emitting unit 13 is illuminating the monitoring area.
If it is desired to detect only the movement of a moving object using an artificial retina sensor, only two images are sufficient.

Therefore, the time during which the light emitting section 13 illuminates is a time during which at least two or more images can be captured. Next, the control unit 16 processes the plurality of captured images and determines whether there is a moving object.
The image processing may be performed by the control unit 16, or the image sensor 12 may perform pre-processing, and the control unit 16 may perform auxiliary processing.

When the controller 16 determines in step S13 that there is a moving object, the controller 16 transmits an intruder detection signal to the alarm transmitter 20 (step S1).
4). Then, it is determined whether or not a preset time (the setting of the timer 15 is, for example, 30 minutes) has elapsed (step S15). Step S12
Also, when it is determined that the object is not detected by the detector 11 in step S13, or when it is determined that the object captured by the image sensor 12 is not a moving object in step S13, the determination process in step S15 is also performed.

In step S15, the set time 3
If it is determined that 0 minutes have elapsed, the cover is further covered with the housing and the detection of dirt is performed (step S1).
6). That is, the control unit 16 activates the light-emitting unit 12 to capture one image of the monitoring area, and determines whether there is any work such as covering or the presence of dirt based on the brightness of the image. The determination as to whether the image is covered or stained is made based on whether or not a predetermined number of pixels having a predetermined range of brightness exist in the captured image.

For example, in the case of an image of 100.times.100 pixels, it is determined that the covering work has been performed when the number of pixels belonging to the brightness within a predetermined range is 8000 or more. In other words, if most of the captured image has substantially the same brightness, it is determined that the sensor portion is covered with some shielding object (shielding material) or is dirty.

In the above-described embodiment, the brightness of a captured image is determined based on whether or not a predetermined number of pixels are present in a predetermined range. However, when a predetermined number or more of the pixels are very bright or completely dark, it may be determined that the pixel is abnormal. For example, two reference values (thresholds) stored in the storage unit 14 are provided as a first reference value and a second reference value, and the reference value (threshold value) is brighter than the first reference value or higher than the second reference value. When it is dark, it can be determined that the cover work has been performed.

That is, the above-mentioned detection of the cover work is performed by:
When an object is put on the entire housing of the composite sensor 10, the illumination of the light emitting unit 13 is reflected on the object and the image becomes very bright. When something is put on only the department,
It takes advantage of the fact that the image goes black.

If it is determined in step S16 that there is cover work or dirt, the control unit 16
Transmits a work detection signal to the alarm transmitter 20 (step S
17), reset the timer 15 (step S18),
Returning to step S11, the above operation is repeatedly executed.

Upon receiving the intruder detection signal, the alarm transmitter 20 may transmit an alarm to the monitoring center 25 if security is in effect, or activate the alarm buzzer 21 or the like to notify the surroundings. You may do so. Further, upon input of the tampering detection signal, the alarm transmitter 20 may transmit an alarm to the monitoring center 25 irrespective of whether the guard is on or off, or activates the alarm buzzer 21 or the like on the spot and turns around. You may make it notify.

Therefore, as described above, in the first embodiment, the brightness of the image in the monitoring area is detected every predetermined time (in this example, 30 minutes), and the brightness is set to a predetermined value. By making a comparison and judging the presence or absence of an abnormality in the sensor based on the comparison result, it is possible to detect a cover work or dirt on the sensor. It is also possible to determine whether the entire housing of the sensor has been modified or the lens portion of the image sensor 12 has been modified, based on the degree of brightness.

In the first embodiment described above,
The image sensor 12 acquires an image for the first time when an object is detected by the detector 11, measures the brightness of the image, and performs light emission of the LED 13 and motion detection based on the measurement result. For example, the image sensor 12 may always acquire an image from when the power is turned on, measure the brightness of each acquired image, and detect the light emission and the movement of the LED 13 based on the measurement result.

Further, if it is known that there are many people in the monitoring area, such as during the daytime, the detector 11
Is not detected at all, which also corresponds to a detection abnormality. Even for such a detection abnormality, the setting time of the timer is set to a time sufficiently longer than 3 minutes, for example, 3 minutes.
This can be dealt with by setting it to 0 minutes.

In the present embodiment, the work detection signal is output by a single cover detection. However, when the cover detection is performed a plurality of times continuously, or when the cover is detected five times, three times the abnormal state is detected. If there is, a work detection signal may be output.

(Second Embodiment) Next, a composite sensor according to a second embodiment will be described. The second embodiment uses a composite sensor configured as shown in FIGS. 1 and 2 and a system configuration using the sensor. However, as will be described later, the time set for the timer 15 is set differently from that of the first embodiment in order to consider a time (for example, 3 minutes) sufficient for the intruder to cover the sensor with a bowl or the like. It is.

FIG. 4 is a flowchart showing an operation example according to the second embodiment of the present invention. In the figure, when a power supply (not shown) of the composite sensor 10 is turned on, power is supplied to each unit of the composite sensor 10 and the control unit 16 starts operating. First, it is determined whether an object has been detected by the detector 11 (step S21). Here, when a detection signal is sent from the detector 11 to the control unit 16 and it is determined that an object has been detected, the control unit 16 further performs image processing on the detector 11 by performing image processing as described in the first embodiment. Then, it is determined whether or not the object detected in (1) is moving (step S22).

In step S22, the control unit 16
When it is determined that there is a moving object, the alarm transmitter 20
(Step S23). Then, the timer 15 is started to start time measurement (step S
24). The timer setting time in this case is, for example, 3 times as a time required for the intruder to perform the cover work.
Set to minutes. After the time measurement by the timer 15 is started, it is determined again whether or not the object has been detected by the detector 11 (step S25). Here, when a detection signal is sent from the detector 11 to the control unit 16 and it is determined that an object is detected, the timer 15 is reset (step S29), the process returns to step S22, and the subsequent operations are executed.

On the other hand, if it is determined in step S25 that no object has been detected, the timer 15 determines whether or not a set time (three minutes in this example) has elapsed (step S26). Here, if it is determined that the set time (3 minutes) has elapsed, furthermore, as in the first embodiment, the covering work of the housing and the detection of dirt are performed (step S27). When the control unit 16 determines that the work is overlaid or dirty, the control unit 16 transmits a work detection signal to the alarm transmitter 20 (step S28). If it is determined that the cover has been worked or there is no dirt, the process returns to step S21 to execute the subsequent operations.

The alarm transmitter 20 receiving each of the above detection signals
As in the first embodiment, when the intruder detection signal is received, an alarm may be transmitted to the monitoring center 25 if security is in progress, or the alarm buzzer 21 or the like may be activated on the spot to notify the surroundings. You may do so. In addition, the alarm transmitter 20
When the work detection signal is input, an alarm may be transmitted to the monitoring center 25 regardless of whether the guard is on or off, or the alarm buzzer 21 or the like may be activated on the spot to notify the surroundings.

Further, in the flowchart shown in FIG. 4, when the overlaid state is detected in step S27, the work detection signal is transmitted immediately. However, when the overlaid state is continuously detected a plurality of times, the work is performed only once. A detection signal may be transmitted. FIG. 5 is a flowchart illustrating an operation example according to the second embodiment in this case.

In FIG. 5, first, i indicating the number of continuous detections of the covering state is initialized (step S31). Subsequently, steps S32 to S38 and S42 are the same as steps S21 to S27 and S29 shown in FIG. 4, and thus description thereof is omitted here. When the cover state is detected in step S38, the above-described continuous detection number i is counted up (step S39).

Then, it is determined whether or not the continuous detection number i indicates a predetermined number (for example, 3) (step S4).
0). If the number of continuous detections i has reached the predetermined number in step S40, the above-mentioned work detection signal is transmitted (step S41), and the process returns to step S31.

On the other hand, if the continuous detection number i has not reached the predetermined number in step S40, the timer is reset (step S43), and the process returns to step S35 again.
At this time, if the overlaid state is detected again in step S38, the above processing is repeated. Step S
If the cover state is not detected in step 38, the process returns to step S31 again.

In addition, in a case where a state in which a moving object is not detected in subsequent image processing despite the detection of an object by the detector 11 occurs continuously, the cover detection is performed. You may. Thus, for example, only the lens portion of the image sensor 12 is worked, so that it is possible to determine that the detection is abnormal even in a state where the detector 11 continuously detects an object.

As described above, in the second embodiment, each time the detector 11 detects an object, it is checked whether the object is covered. This is because an intruder or the like is inevitably detected by the detector 11 in order to perform the covering work. In addition, the reason why the overlaying work is checked after a predetermined time (3 minutes) after the detection by the detector 11 is to consider the time for performing the overlaying work.

In the above description, the detector 1
Although it is described that the cover detection is performed a predetermined time after detecting the object, the detector 11 detects the moving object, and starts counting the predetermined time when the moving object is detected by the image sensor 12, The cover detection may be performed when the predetermined time has elapsed.

Further, when it is known that there are many people in the monitoring area, such as during the daytime, the detector 11
Is not detected at all, which also corresponds to a detection abnormality. Even for such a detection abnormality, the setting time of the timer is set to a time sufficiently longer than 3 minutes, for example, 3 minutes.
This can be dealt with by setting it to 0 minutes.

In the present embodiment, a work detection signal is output when a cover is detected a plurality of times consecutively. However, for example, the cover is detected five times, and three times the cover is detected. If there is an abnormality, a work detection signal may be output.

Third Embodiment FIG. 6 is a block diagram showing a composite sensor according to a third embodiment of the present invention and a system configuration using the sensor. The composite sensor 30 is different from the configuration of the first embodiment shown in FIG. 1 in that a first timer 15a and a second timer 15b for setting different times are provided. Therefore, since the other components and their functions are the same as those in the first embodiment, they are denoted by the same reference numerals as those in FIG. 1 and description thereof is omitted.

FIG. 7 is a flowchart showing an operation example according to the third embodiment of the present invention. In the figure, when a power supply (not shown) of the composite sensor 10 is turned on, power is supplied to each unit of the composite sensor 10 and the control unit 16 starts operating. First, the first timer 15a is started, and a first set time set in advance is counted (step S51). The set time of the first timer 15a is, for example, 30 minutes. Then, it is determined whether or not the object is detected based on the presence or absence of the infrared ray emitted from the object by the detector 11 (step S52). Here, when a detection signal is sent from the detector 11 to the control unit 16 and it is determined that an object has been detected, the control unit 16 performs image processing to execute the detection on the detector 1.
It is determined whether the object detected in step 1 is moving (step S53).

In step S53, the control unit 16
When it is determined that there is a moving object, the alarm transmitter 20
(Step S54). Then, the second timer 15b is activated to start time measurement (step S55). The set time of the second timer 15a (first time: for example, 30 minutes) is set to, for example, 3 minutes in consideration of a time sufficient for performing the covering work.

Subsequently, it is determined again whether or not an object has been detected by the detector 11 (step S56). Here, when a detection signal is sent from the detector 11 to the control unit 16 and it is determined that an object has been detected, the timer of the second timer 15b is reset (step S62), the process returns to step S53, and the subsequent operations are executed. .

On the other hand, if it is determined in step S56 that no object has been detected, the second timer 15
It is determined whether or not b has exceeded a set time (second time: 3 minutes in this example) (step S57). Here, if it is determined that the set time (3 minutes) has elapsed,
As in the first embodiment, the covering work of the housing and the detection of dirt are performed (step S58). And the control unit 16
Transmits a work detection signal to the alarm transmitter 20 when it is determined that the work is covered or dirty (step S).
59). If it is determined that the cover has been worked or there is no dirt, the first timer 15a and the second timer 15b
Is reset (step S60).

If it is determined in step S52 that no object has been detected, it is further determined whether or not the set time (30 minutes) of the first timer 15a has elapsed (step S61). If the set time (30 minutes) has elapsed, the process proceeds to step S58, where detection of cover work or the like is performed. If the set time (30 minutes) has not elapsed, the process returns to step S51, and the subsequent processing is executed.

Upon receiving the intruder detection signal, as in the first and second embodiments, the alarm transmitter 20 having received each of the above detection signals transmits an alarm to the monitoring center 25 if security is in effect. Alternatively, the alarm buzzer 21 or the like may be activated on the spot to notify the surroundings. Further, upon input of the tampering detection signal, the alarm transmitter 20 may transmit an alarm to the monitoring center 25 irrespective of whether the guard is on or off, or activates the alarm buzzer 21 or the like on the spot and turns around. You may make it notify.

Further, at a later stage of the flowchart shown in FIG. 7 (from step S57), as shown in FIG. 5, a work detection signal may be transmitted when a cover state is detected a plurality of times in succession. FIG. 8 is a flowchart illustrating an operation example according to the third embodiment in this case.

In FIG. 8, first, the first timer 15a
Is started (step S71), and i indicating the number of continuous detections of the covering state is initialized (step S72).
Subsequently, steps S73 to S79, S83, S84, S
Reference numeral 85 denotes steps S52 to S58 and S6 shown in FIG.
0, S61, and S62, and the description thereof is omitted here. Therefore, when the cover state is detected in step S79, the above-described continuous detection number i is counted up (step S80).

Then, it is determined whether or not the continuous detection number i indicates a predetermined number (for example, 3) (step S8).
1). If the number of continuous detections i has reached the predetermined number in step S81, the above-mentioned work detection signal is transmitted (step S82), and the process proceeds to step S83.

On the other hand, if the continuous detection number i has not reached the predetermined number in step S81, the second timer 1
5b is reset (step S86), and step S is performed again.
Return to 76. At this time, if the cover state is detected again in step S79, the above-described processing is repeated. If the cover state is not detected in step S79, the process returns to step S51 again.

As described above, in the third embodiment, as in the second embodiment, every time the detector 11 detects an object, a check of the covering work is performed. This is because an intruder or the like is inevitably detected by the detector 11 in order to perform the covering work. In addition, when the detector 11 does not output the detection signal for a predetermined time or more, the covering work is checked. That is, it is abnormal that the sensor does not show any response for as long as 30 minutes in spite of a long period of time such as daytime. Similarly, the cover of only the lens portion of the image sensor 12 can be detected.

In addition, in a case where a state in which a moving object is not detected continuously in the subsequent image processing despite the detection of an object by the detector 11 occurs continuously, the cover detection is performed. You may. Thus, for example, only the lens portion of the image sensor 12 is worked, so that it is possible to determine that the detection is abnormal even in a state where the detector 11 continuously detects an object.

In the above description, the detector 1
Although it is described that the cover detection is performed a predetermined time after detecting the object, the detector 11 detects the moving object, and starts counting the predetermined time when the moving object is detected by the image sensor 12, The cover detection may be performed when the predetermined time has elapsed.

In the present embodiment, a work detection signal is output when a cover is detected a plurality of times consecutively. However, for example, the cover is detected five times, and three times the cover is detected. If there is an abnormality, a work detection signal may be output.

[0071]

As described above, according to the composite sensor according to the present invention (claim 1), the light emitting means emits light every predetermined time (for example, 30 minutes), and the image is taken from the imaging means. The brightness of the captured image, for example, when there are more than a predetermined number of pixels in a predetermined brightness range, to check the shield work and dirt on the sensor,
It is possible to determine an abnormal state in which the cover work has been performed or the sensor has been stained.

Further, according to the composite sensor according to the present invention (claim 2), two light sources such as the first lightness and the second lightness are provided, and the light emitting means is provided every predetermined time (for example, 30 minutes). When the image is captured from the imaging unit by emitting light, and the brightness of the captured image is higher than the first brightness or lower than the second brightness, that is, an action of covering the sensor housing with something. When the object is covered, the illumination of the light emitting means is reflected on the covered object, and the image becomes very bright.When an object is covered only on the lens portion of the imaging means, the image is completely dark. By using this characteristic, it is possible to detect whether the sensor has been covered or the sensor is dirty, in order to check whether the sensor has been worked on a shield (covering work) or whether it is undetectable dirt. , Also may be the degree of brightness, or the entire housing of the sensor is crafted, or the lens portion of the imaging means to determine whether the abnormal state crafted.

Further, according to the composite sensor of the present invention (claim 3), after detecting the intruder by the detecting means and the imaging means, the light emitting means is caused to emit light at predetermined time intervals in consideration of the sensor working time. When the number of pixels belonging to the brightness of the captured image is equal to or greater than a predetermined number of pixels in a predetermined brightness range, for example, a shield work on the sensor, Since it is determined that the dirt has been tampered with or cannot be detected, it is possible to perform reliable detection in anticipation of the time of performing an illegal act such as covering with a sensor.

According to the composite sensor of the present invention (claim 4), the light-emitting means emits light to capture an image from the imaging means, and the brightness of the captured image is equal to the first brightness.
The brightness and the second brightness are provided, and after detecting the intruder by the detection means and the imaging means, the light emission means is made to emit light every predetermined time in consideration of the sensor modification time, and the image is captured from the imaging means, When the brightness of the captured image is brighter than the first brightness or darker than the second brightness, that is, when an action of covering an entire sensor housing is performed, The image is very bright as the light reflects off the overlying object,
Further, when an object is covered only on the lens unit of the image pickup means, by utilizing the characteristic that the image is completely dark, a shield work (covering work) on the sensor has been performed or the sensor cannot be detected. Since it is determined whether or not the sensor is dirty, it is possible to perform a reliable detection in consideration of a time for performing an illegal act such as covering the sensor.

Further, according to the composite sensor of the present invention (claim 5), the detecting means detects the intruder and the second time (for example, 3 minutes) allowing for a sufficient time for the sensor modification. ) Has elapsed and the detection means does not output a detection signal even after the first time (for example, 30 minutes) has elapsed (no response occurs even during a certain time zone of traffic).
At both timings in the case, the light emitting unit emits light to capture an image from the image capturing unit, and when the pixels constituting the captured image are present in a predetermined brightness range and a predetermined number or more, for example, the shielding to the sensor is performed. Work work, that is, to determine that the overwork has been performed or undetectable dirt, it is possible to check the overwork at both timing after the detection of the intruder and after a predetermined time, more reliable Monitoring of fraud is realized.

According to the composite sensor of the present invention, the detecting means detects the intruder, and the second time estimating a sufficient time for performing the tampering with the sensor has elapsed. , And sensing means for a first time (eg, 3
0 minutes), the detection signal is not output (there is no response even during a certain time zone) and the light-emitting unit is caused to emit light and the image is taken from the image-capturing unit at both timings. If the brightness of the captured image is brighter than the first brightness or darker than the second brightness,
That is, when an object is being put on the entire sensor housing, the illumination of the light emitting means is reflected on the covered object, and the image becomes very bright. When covered with an object, the sensor is used to check whether the sensor has been worked on (covering work) or whether it is undetectable dirt by using the characteristic that the image becomes completely dark. The overlaying work can be determined both at the timing after the detection of the errant and at the timing after the predetermined time, and more reliable monitoring of fraudulent acts is realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a composite sensor according to a first embodiment of the present invention and a system configuration using the sensor.

FIG. 2 is a perspective view showing an overview of the composite sensor shown in FIG.

FIG. 3 is a flowchart illustrating an operation example according to the first embodiment of the present invention;

FIG. 4 is a flowchart illustrating an operation example according to the second embodiment of the present invention;

FIG. 5 is a flowchart showing another operation example according to the second embodiment of the present invention;

FIG. 6 is a block diagram illustrating a composite sensor according to a third embodiment of the present invention and a system configuration using the sensor;

FIG. 7 is a flowchart illustrating an operation example according to the third embodiment of the present invention;

FIG. 8 is a flowchart illustrating another operation example according to the third embodiment of the present invention;

[Explanation of symbols]

 10, 30 Composite sensor 11 Detector 12 Image sensor 13 Light emitting unit 14 Storage unit 15 Timer 15a First timer 15b Second timer 16 Control unit 20 Alarm transmitter 21 Alarm buzzer 22 Monitoring center

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Katsuyuki Miyoshi, Inventor 1-6-6 Moto-Akasaka, Minato-ku, Tokyo Inside Sogo Police Security Co., Ltd. (72) Eiji Shimada 1-6-1, Moto-Akasaka, Minato-ku, Tokyo No. 6 Inside Sogo Police Security Co., Ltd. (72) Takaaki Sakaguchi, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Yasuya Miyake 2-2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3 Inside Mitsubishi Electric Corporation (72) Inventor Toshiyuki Tamura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Kenichi Tanaka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Kazuo Hisuma 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C054 CA04 CA05 CB03 C C03 CH03 CH04 FC05 FC13 FC15 FF06 HA18 5C084 AA02 AA07 BB04 DD41 DD56 DD89 EE09 EE10 GG54 GG68 GG78 5L096 BA02 CA01 FA14 GA28 HA03 9A001 HH23 LL03

Claims (6)

[Claims] 1. A composite sensor having a plurality of sensors having different detection principles, wherein: an imaging unit for imaging a predetermined monitoring area; a light emitting unit for illuminating the monitoring area; and a time measuring for a predetermined time from a preset time. Repeating time-measuring means, the light-emitting means is made to emit light at predetermined time intervals counted by the time-measuring means, and the number of pixels in a predetermined brightness range of an image taken from the imaging means at the same time as light emission by the light-emitting means is equal to or more than a predetermined number Control means for outputting an abnormality signal indicating a detection abnormality when included, a composite type sensor comprising: 2. A composite sensor having a plurality of sensors having different detection principles, wherein: an image pickup means for picking up an image of a predetermined monitoring area; a light emitting means for illuminating the monitoring area; and measuring a predetermined time from a preset time. A timer means for repeating, and the light emitting means emits light at predetermined time intervals counted by the time measuring means, and a first image captured by the imaging means simultaneously with the light emission by the light emitting means.
Control means for outputting an abnormality signal indicating a detection abnormality, when pixels having brightness equal to or more than a predetermined number are included, or when the image includes pixels having brightness equal to or less than a second brightness, a predetermined number or more, A composite sensor comprising: 3. A composite sensor having a plurality of sensors having different detection principles, wherein: a detection means for detecting an object present in a predetermined detection area; an imaging means for capturing an image of a predetermined monitoring area; A light emitting unit that performs time measurement for a predetermined time; and a moving object is detected when an object is detected by the detection unit, or when an object is detected by the detection unit and an image captured from the imaging unit is used. In this case, the timer is started, and when the timer completes the clocking of the predetermined time, the light emitting unit is caused to emit light, and at the same time, the image captured from the imaging unit is emitted by the light emitting unit. Control means for outputting an abnormality signal indicating a detection abnormality when pixels in a predetermined brightness range are included in a predetermined number or more. A composite sensor characterized by the following. 4. A composite sensor having a plurality of sensors having different detection principles, wherein: a detection means for detecting an object existing in a predetermined detection area; an imaging means for imaging a predetermined monitoring area; and illuminating the monitoring area. A light emitting unit that performs time measurement for a predetermined time; and a moving object is detected when an object is detected by the detection unit, or when an object is detected by the detection unit and an image captured from the imaging unit is used. In this case, the timer is started, and when the timer completes the clocking of the predetermined time, the light emitting unit is caused to emit light, and at the same time, the image captured from the imaging unit is emitted by the light emitting unit. , When a predetermined number or more of pixels having the first brightness or higher are included, or when the image includes a predetermined number or more of pixels having the second brightness or lower. If, complex sensor characterized by comprising a control means for outputting an abnormality signal indicating detection abnormality. 5. A composite sensor having a plurality of sensors having different detection principles, wherein: a detection unit for detecting an object existing in a predetermined detection area; an imaging unit for imaging a predetermined monitoring area; and illuminating the monitoring area. Light-emitting means, a first time-measuring means for repeating a time measurement of a first time from a preset time, a second time-measurement means for measuring a second time, and when an object is detected by the detection means Or, when the object is detected by the detection means and the object is detected by the image captured from the imaging means, the second time measurement means is activated, and the second time measurement means measures the second time. Is completed, or the first time counting by the first time counting unit is performed without detecting a moving object by the image captured from the detection unit and the imaging unit. Upon completion, the light-emitting means emits light,
Control means for outputting an abnormality signal indicating a detection abnormality when an image captured from the imaging means at the same time as light emission by the light emission means includes a predetermined number or more of pixels in a predetermined brightness range. A composite sensor characterized by the following. 6. A composite sensor having a plurality of sensors having different detection principles, wherein: a detection means for detecting an object present in a predetermined detection area; an imaging means for capturing an image of a predetermined monitoring area; Light-emitting means, first time-measuring means for repeating time measurement of a first time from a preset time, second time-measurement means for measuring a second time, and when an object is detected by the detection means Or, when the object is detected by the detection means and the object is detected by the image captured from the imaging means, the second time measurement means is activated, and the second time measurement means measures the second time. Is completed, or the first time counting by the first time counting unit is performed without detecting a moving object by the image captured from the detection unit and the imaging unit. Upon completion, the light-emitting means emits light,
When an image captured from the imaging unit at the same time as light emission by the light emitting unit includes a predetermined number or more of pixels having a first brightness or higher, or includes a predetermined number or more of pixels having a second brightness or lower in the image. Control means for outputting an abnormality signal indicating a detection abnormality when the detection is performed.