JP2016053939A - Detection device, detection system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection device, detection system, and program that can suppress incorrect determination of the presence/absence of a person even when a sudden change of light occurs in a detection area of an analysis image.SOLUTION: A detection part 31 detects the presence/absence of a person in a detection area of an analysis image photographed by an imaging part 2. A determination part 34 determines the presence/absence of a person in the detection area on the basis of a result of the detection by the detection part 31. A derivation part 33 derives the size of a luminance change area where the amount of change in luminance in a predetermined period T1 in the detection area is equal to or larger than a first threshold S1. A judging part 35 judges that a change of light is present when the size of the luminance change area is equal to or larger than a second threshold S2. When the judging part 35 judges that a change of light is present, the determination part 34 does not adopt the result of the detection by the detection part 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a detection device, a detection system, and a program.

  Conventionally, a human body detection technique using a change in an analysis image captured by an image sensor has been proposed. In this type of technology, if a sudden light change occurs in the detection region of the analysis image, for example, overexposure or blackout may occur, which may hinder human body detection. Thus, a detection device (monitoring camera) that detects the presence or absence of a person relatively accurately by suppressing the occurrence of overexposure is known (see, for example, Patent Document 1).

JP 2006-259591 A

  However, in the device described in Patent Document 1, it is necessary to control the light emission timing and the light emission amount of the lighting device in order to suppress the occurrence of overexposure. That is, in the device described in Patent Document 1, light emission of the lighting device may be limited in order to suppress a rapid light change that causes overexposure in the detection region of the analysis image.

  Therefore, the present invention has been made in view of the above-described reason, and even if a sudden light change occurs in the detection region of the analysis image, it is possible to suppress erroneous determination of the presence or absence of a person. It is an object to provide a detection device, a detection system, and a program that can be used.

  The detection device of the present invention includes an imaging unit, a detection unit that detects the presence or absence of a person in a detection region of an analysis image captured by the imaging unit, and the presence or absence of a person based on a detection result of the detection unit. A determination unit for determining, a derivation unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than the first threshold in the detection region, and the size of the luminance change region is the second A determination unit that determines that there is a light change if the threshold value is greater than or equal to the threshold, and the detection unit stops the detection operation in the second predetermined period when the determination unit determines that there is a light change, or the second predetermined In the period, the determination unit maintains the determination result before the start of the second predetermined period without adopting the detection result of the detection unit.

  The detection system of the present invention includes an imaging unit, a detection unit that detects the presence or absence of a person in a detection region of an analysis image captured by the imaging unit, and the presence or absence of a person based on a detection result of the detection unit. A determination unit for determining, a derivation unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than the first threshold in the detection region, and the size of the luminance change region is the second A determination unit that determines that there is a light change if the threshold value is greater than or equal to a threshold value and a load to be controlled. When the determination unit determines that there is a light change, the detection unit stops the detection operation during a second predetermined period. In the second predetermined period, the determination unit maintains the determination result before the start of the second predetermined period without adopting the detection result of the detection unit.

  The program of the present invention includes a detection unit that detects the presence / absence of a person in a detection region of an analysis image, a determination unit that determines the presence / absence of a person based on a detection result of the detection unit, and a detection A deriving unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than the first threshold, and the light change if the luminance change region is equal to or greater than the second threshold A determination unit that determines that there is a light change, and when the determination unit determines that there is a light change, the detection unit stops the detection operation in the second predetermined period, or the determination unit detects in the second predetermined period This is a program for functioning as a detection device that maintains the determination result before the start of the second predetermined period without adopting the detection result of the part.

  The detection device, the detection system, and the program according to the present invention can suppress erroneous determination of the presence or absence of a person even if a sudden light change occurs in the detection region of the analysis image.

FIG. 1 is a block diagram of a detection device 100 and a detection system 120 according to Embodiment 1 of the present invention. FIG. 2 is a flowchart showing an example of the operation of the detection apparatus 100 according to the first embodiment of the present invention. FIG. 3 is a block diagram of the detection apparatus 200 and the detection system 220 according to Embodiment 2 of the present invention. FIG. 4 is a flowchart showing an example of the operation of the detection apparatus 200 according to Embodiment 2 of the present invention. FIG. 5 is a flowchart showing an example of the operation of the detection apparatus 300 according to Embodiment 3 of the present invention. FIG. 6 is a flowchart showing an example of the operation of the detection apparatus 400 according to Embodiment 4 of the present invention. FIG. 7 is a block diagram of a detection device 500 and a detection system 520 according to Embodiment 5 of the present invention. FIG. 8 is a flowchart showing an example of the operation of the detection apparatus 500 according to the fifth embodiment of the present invention. 9A and 9B show an example of the existence region 22 created by the creation unit 36 of the detection apparatus 500 according to Embodiment 5 of the present invention with respect to the analysis image, and the derivation unit 33 derives the positional change amount of the existence region 22. It is a conceptual diagram which shows an example to do. FIG. 9A is a conceptual diagram showing an analysis image detection region 21 in a frame before two consecutive frames of the analysis image. FIG. 9B is a conceptual diagram showing the detection region 21 of the analysis image in a frame after two consecutive frames of the analysis image. 10A and 10B are conceptual diagrams illustrating an example in which the deriving unit 33 derives the amount of movement of a person when the detection apparatus 500 according to Embodiment 5 of the present invention detects the presence or absence of a person in the stay detection mode. is there. FIG. 10A is a conceptual diagram showing a stay area 23a in a frame before two consecutive frames according to Embodiment 5 of the present invention. FIG. 10B is a conceptual diagram showing a stay area 23b in a frame after two consecutive frames according to Embodiment 5 of the present invention. FIG. 11 is a conceptual diagram illustrating an example of an operation for a certain period before and after a sudden light change occurs in the detection apparatus 500 according to the fifth embodiment of the present invention. FIG. 12 is a conceptual diagram illustrating an example of an operation for a fixed period before and after a sudden light change occurs in the detection apparatus 500 according to Embodiment 5 of the present invention. FIG. 13 is a conceptual diagram illustrating an example of an operation for a certain period before and after a sudden light change occurs in the detection apparatus 500 according to the fifth embodiment of the present invention.

(Embodiment 1)
Hereinafter, the detection apparatus 100 and the detection system 120 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a block diagram of the detection device 100 and the detection system 120. As shown in FIG. 1, the detection device 100 includes an imaging unit 2 and a control unit 3.

  The imaging unit 2 captures an area where the detection device 100 detects the presence or absence of a person.

  The control unit 3 includes a detection unit 31, a determination unit 34, a derivation unit 33, and a determination unit 35. The detection unit 31 detects the presence or absence of a person in the detection area of the analysis image captured by the imaging unit 2. Based on the detection result of the detection unit 31, the determination unit 34 determines whether or not there is a person in the detection area of the analysis image. The deriving unit 33 is a size of an area (hereinafter referred to as “luminance change area”) in which the luminance change amount in the predetermined period T1 (first predetermined period) is equal to or greater than the first threshold S1 in the detection area of the analysis image. Is derived. The determination unit 35 determines that there is a light change if the size of the luminance change region derived by the deriving unit 33 is equal to or greater than the second threshold S2.

  Note that the detection area of the analysis image may be, for example, a partial area of the image captured by the imaging unit 2 or may be the entire area of the image captured by the imaging unit 2.

  The control unit 3 further includes a storage unit 32 that stores a predetermined period T1, a predetermined period T2, a first threshold value S1, and a second threshold value S2.

  That is, when a sudden light change occurs due to switching of an operation mode to be controlled, which will be described later, or a disturbance in the detection region of the analysis image, the luminance change amount in the predetermined period T1 is compared with the first threshold value S1. The If there is a region where the amount of change in luminance during the predetermined period T1 is equal to or greater than the first threshold value S1, the deriving unit 33 uses this region (region where the amount of change in luminance is equal to or greater than the first threshold value S1) as the luminance change region. Deriving the size of the region. Then, the determination unit 35 determines that there is a light change if the size of the luminance change region is equal to or greater than the second threshold S2. Therefore, the control unit 3 can detect the occurrence of a rapid light change in the detection region of the analysis image. Note that the rapid light change mentioned here includes a change in brightness that does not lead to overexposure of the analysis image, and a change in light when changing from a bright state (high luminance) to a dark state (low luminance). . Furthermore, it may be configured that the determination unit 35 determines that there is a light change even for a light change that does not change abruptly due to a light change that is not abrupt, for example, a fade-in / fade-out of the lighting device.

  The detection method in which the detection part 31 detects the presence or absence of a person is not specifically limited. For example, the presence / absence of a person may be detected based on the difference between the analysis image data and the background image data, or the presence / absence of a person may be detected based on the difference between the analysis image data between frames.

  The determination unit 34 normally determines the presence / absence of a person based on the detection result of the detection unit 31 detecting the presence / absence of a person. On the other hand, when the determination unit 35 determines that there is a light change, that is, when a sudden light change occurs, the determination unit 34 determines whether the person in the detection unit 31 is present during the predetermined period T2 (second predetermined period). Does not adopt the detection result. That is, when it is determined that there is a light change, the determination unit 34 maintains the determination result before the start of the predetermined period T2 without adopting the detection result of the detection unit 31 during the predetermined period T2.

  The predetermined period T1 may be, for example, a predetermined period (for example, 0.5 seconds) stored in advance in the storage unit 32, or may be a period between frames. The period between frames is, for example, 0.033 seconds, but is not limited thereto.

  The predetermined period T2 is a period corresponding to a period in which a rapid light change occurs, for example. That is, the predetermined period T2 corresponds to, for example, a period from when the determination unit 35 determines that there is a light change to when it recovers from the light change (that is, when the determination unit 35 does not determine that there is a light change).

  FIG. 2 is a flowchart illustrating an example of the operation of the detection apparatus 100.

  In step S21, the deriving unit 33 derives the size of the luminance change area in which the luminance change amount in the predetermined period T1 is equal to or greater than the first threshold S1 in the analysis image detection area, and the process proceeds to step S22. Note that, in the detection region of the analysis image, when the luminance change amount in the predetermined period T1 is less than the first threshold S1, the size of the luminance change region is not derived.

  In step S22, when the size of the luminance change region is equal to or larger than the second threshold value S2 (YES in step S22), the determination unit 35 determines that there is a light change and proceeds to step S23. If the size of the brightness change area is less than the second threshold S2 (NO in step S22), the process returns to step S21, and the deriving unit 33 determines that the brightness change amount in the predetermined period T1 is the first in the analysis image detection area. The size of the luminance change area that is equal to or greater than the threshold value S1 is derived.

  Note that the method for deriving the size of the luminance change region is not particularly limited, and the deriving unit 33 may derive, for example, the number of pixels constituting the luminance change region as the size of the luminance change region. The total area may be the size of the luminance change region.

  In step S23, when the determination unit 35 determines that there is a light change, the determination unit 34 does not employ the detection result of the detection unit 31 in the predetermined period T2. That is, when the determination unit 35 determines that there is a light change and proceeds to step S23, the determination unit 34 does not adopt the detection result of the detection unit 31 until the predetermined period T2 elapses and before the start of the predetermined period T2. Maintain the judgment result.

  In step S23, when the predetermined period T2 has passed (YES in step S23), the determination unit 34 determines the presence / absence of a person based on the detection result of the presence / absence of the person in the detection unit 31 (step S24). .

  In addition, the detection part 31 is detecting the presence or absence of the person in the detection area | region of the analysis image which the imaging part 2 imaged in parallel with step S21-S24. For example, instead of periodically performing steps S21 to S24, when the detection unit 31 detects that there is a person in the detection region of the analysis image captured by the imaging unit 2, Steps S21 to S24 may be performed. In this case, it is possible to save the power of the detection device 100 as compared with the case where steps S21 to S24 are periodically performed. Further, when the determination unit 34 determines that there is a person based on the detection result of the detection unit 31, steps S <b> 21 to S <b> 24 may be performed.

  The detection system 120 includes the detection device 100 and a load 5 to be controlled.

  That is, the detection system 120 includes the imaging unit 2, the detection unit 31, the determination unit 34, the derivation unit 33, the determination unit 35, and the load 5 to be controlled. The detection unit 31 detects the presence or absence of a person in the detection area of the analysis image captured by the imaging unit 2. The determination unit 34 determines the presence or absence of a person based on the detection result of the detection unit 31. The deriving unit 33 derives the size of the luminance change area in which the luminance change amount in the predetermined period T1 is equal to or greater than the first threshold S1 in the detection area. The determination unit 35 determines that there is a light change if the size of the luminance change region is equal to or greater than the second threshold S2. When the determination unit 35 determines that the light change is present, the determination unit 34 maintains the determination result before the start of the predetermined period T2 without adopting the detection result of the detection unit 31 in the predetermined period T2.

  In the detection system 120, for example, the detection unit 31 may be externally attached to the detection device 100 without being provided in the detection device 100. In addition, the detection system 120 may be configured such that the detection device 100 directly controls the load 5 based on the determination result of the presence / absence of a person in the determination unit 34, or the detection device 100 You may further have a transmission part. In the former case, the control unit 3 of the detection device 100 directly controls the load 5 to be controlled based on the determination result of the presence or absence of the person in the determination unit 34. In the latter case, the transmission unit transmits a control signal to the control target based on the determination result of the presence / absence of the person in the determination unit 34. That is, the transmission unit acquires the determination result from the determination unit 34, and transmits the control signal based on the determination result to the load 5 that is the control target, thereby controlling the load 5. The transmission unit may be externally attached to the control unit 3 or may be included in the control unit 3. Further, the transmission unit may be provided separately from the detection device 100 and may constitute the detection system 120 together with the detection device 100 and the load 5.

  Although it is assumed that the load 5 is a lighting device having at least two operation modes of “light-off” and “light-on”, the present invention is not limited to this. For example, it may be an electric device having at least two operation modes such as an air conditioner (air conditioner for adjusting indoor temperature and humidity), a cooking device, and the like.

  When the determination unit 34 determines that there is a person, the detection apparatus 100 transmits a control signal instructing “lighting” to the load 5. Then, when the determination unit 34 determines that there is no person, the detection device 100 transmits a control signal that instructs the load 5 to “turn off”. In addition, the transmission method of the control signal from the detection apparatus 100 to the load 5 is not particularly limited. For example, the detection apparatus 100 may transmit the control signal directly to the load 5 or may transmit it via a repeater.

  When the load 5 receives a control signal instructing “lighting” from the detection device 100, the load 5 switches from the “lighting off” operation mode to the “lighting” operation mode. At that time, an abrupt light change occurs in the analysis image captured by the imaging unit 2. At that time, the detection unit 31 may not be able to detect a person or may be erroneously detected.

  Therefore, as described above, in the detection device 100 and the detection system 120, when the determination unit 35 determines that there is a light change, the determination unit 34 does not adopt the detection result of the detection unit 31 in the predetermined period T2. Therefore, when an abrupt light change occurs in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, even if an error occurs in detection of the detection target by the detection unit 31, it is not easily affected by this. It can be determined whether or not there is. Therefore, the detection device 100 and the detection system 120 can suppress erroneous determination of the presence or absence of a person even if, for example, overexposure occurs due to a rapid light change in the detection region of the analysis image.

  In addition, the rapid light change of the analysis image due to switching of the operation mode of the load 5 or disturbance is settled after a certain period of time. Therefore, the determination unit 34 does not adopt the detection result of the presence / absence of a person in the predetermined period T2 corresponding to the period in which the above-described rapid light change occurs, so that when the above-described rapid light change is eliminated, The presence / absence of a person can be determined based on the detection result of the detection unit 31. That is, when the determination unit 35 determines that there is a light change, the determination unit 34 resumes the determination of the presence of a person based on the detection result of the detection unit 31 when the predetermined period T2 has elapsed. Therefore, the detection device 100 and the detection system 120 can determine the presence or absence of a person with higher accuracy.

  In addition, although the control part 3 is demonstrated to be provided with the detection part 31, the memory | storage part 32, the derivation | leading-out part 33, the determination part 34, and the determination part 35, it is not limited to this. For example, the storage unit 32 may be externally attached to the control unit 3.

  In addition, when the determination unit 35 determines that there is a light change, it has been described that the determination unit 34 does not adopt the detection result of the presence or absence of a person in the detection unit 31 in the predetermined period T2, but the determination unit 35 has a light change. If it is determined that, the detection unit 31 may stop the detection operation in the predetermined period T2. In this case, since the detection unit 31 stops the detection operation, even if, for example, overexposure occurs due to a rapid light change in the detection region of the analysis image, it is possible to suppress erroneous determination of the presence of a person. can do.

  Further, when the determination unit 35 determines that there is a light change, the imaging unit 2 may increase the frame rate. That is, the detection apparatus 100 may be configured to increase the frame rate of the imaging unit 2 during the predetermined period T2. Since the imaging unit 2 can shorten the feedback period by increasing the frame rate, the imaging unit 2 can shorten the period from when the rapid light change occurs until the rapid light change is recovered.

  Further, the predetermined period T2 may be shorter than the period in which the rapid light change occurs, or longer than the period in which the rapid light change occurs, depending on the use environment and purpose of use of the detection device 100 and the detection system 120. It may be a period. Even if the predetermined period T2 is shorter than the period in which the rapid light change occurs, the period affected by the rapid light change can be shortened compared to the case where the predetermined period T2 is not provided at all. It is possible to suppress erroneous determination of the presence or absence of a person.

  Further, when the predetermined period T2 is longer than the period in which the rapid light change occurs, the determination unit 34 waits for a period (time) instead of immediately after the rapid light change is finished. The determination of the presence / absence of the person based on the detection result of the presence / absence of the person is resumed. That is, the determination unit 34 does not immediately adopt the detection result of the detection unit 31 after the end of the rapid light change, but determines the presence or absence of a person based on the detection result of the detection unit 31 after a period of time. Thus, the presence or absence of a person can be determined with higher accuracy.

  Moreover, although the predetermined period T2 has been described as being stored in the storage unit 32 in advance, the present invention is not limited thereto. For example, after determining that there is a light change, the determination unit 35 determines the end of the light change, and the period from when the determination unit 35 determines that there is a light change until the time when the light change is determined is defined as a predetermined period T2. Also good. In this case, the detection apparatus 100 can adjust the length of the predetermined period T2 according to a change in the surrounding environment. In other words, in this case, the predetermined period T2 is a predetermined (predetermined) period such as a period from when the determination unit 35 determines that there is a light change to when it is determined that the light change ends. . Thus, the predetermined period T2 does not have to be a predetermined (predetermined) length, and may be a variable-length period.

  The means for determining the end of the light change is not particularly limited. For example, the determination unit 35 can determine the end of the light change as follows. That is, if the size of the region in which the luminance change amount in the detection period of the analysis image in the predetermined period T1 in the predetermined period T1 is equal to or smaller than the third threshold S3 in the predetermined period T2, the determination unit 35 can determine that the light change is completed. Alternatively, the determination unit 35 may determine the end of the light change based on the gain recovery state of the imaging unit 2, the exposure period of the imaging unit 2, and the luminance value in the detection region of the analysis image.

  In short, if the size of the non-change area in which the luminance change amount in the detection period in the predetermined period T1 in the predetermined period T1 is equal to or smaller than the third threshold S3 in the predetermined period T2 is greater than or equal to the second threshold S2. It may be determined that the light change has ended. In this case, the predetermined period T2 is preferably a period from the time when the determination unit 35 determines that the light change is present to the time when the determination unit 35 determines that the light change is completed.

(Embodiment 2)
Hereinafter, the detection device 200 and the detection system 220 according to Embodiment 2 of the present invention will be described with reference to FIGS. 3 and 4. The detection device 200 and the detection system 220 are different from the detection device 100 and the detection system 120 in that when the detection unit 31 detects the presence of a person, the control unit 3 creates a creation unit 36 that creates a presence area surrounding the detected person. And the operation of the determination unit 34 are different. In addition, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  FIG. 3 is a block diagram of the detection device 200 and the detection system 220. As shown in FIG. 3, the control unit 3 further includes a creation unit 36.

  When the detection unit 31 detects the presence of a person, the creation unit 36 surrounds the person based on the width and height of the person in the detection area of the analysis image. Is created in the detection region of the analysis image. The creation unit 36 may create an existence area for each frame. Further, the creating unit 36 may create an existing area for each predetermined number of frames.

  When the determination unit 35 determines that there is a light change, the creation unit 36 determines a predetermined period of time equal to or longer than the predetermined period T2 based on the existence region created by the creation unit 36 immediately before the determination unit 35 determines that there is a light change. A virtual existence area that is virtual when a person exists at T3 (third predetermined period) is created.

  Note that the shape of the existence area and the virtual existence area is not limited to a rectangular shape. For example, a rhombus may be used.

  Hereinafter, the creation unit 36 will be described assuming that the existence region created immediately before the determination unit 35 determines that there is a light change is a virtual existence region, but this is not a limitation. For example, the creation unit 36 may create a virtual existence region based on the existence region created before the determination unit 35 determines that there is a light change.

  The determination unit 34 determines the presence or absence of a person based on the result of the creation unit 36. That is, the determination unit 34 determines that there is a person if either the existence area or the virtual existence area exists, and if both the existence area and the virtual existence area do not exist, the existence of the person is determined. Judge that there is no.

  FIG. 4 is a flowchart illustrating an example of the operation of the detection device 200. Steps S41 and S45 are the same as steps S21 and S24 in FIG.

  In step S42, when the size of the luminance change region derived by the deriving unit 33 in step S41 is greater than or equal to S2 (YES in step S42), the determination unit 35 determines that there is a light change and proceeds to step S44. When the size of the brightness change area is less than the second threshold value S2 (NO in step S42), the process returns to step S41, and the deriving unit 33 continues to derive the size of the brightness change area.

  In step S44, the determination unit 34 does not employ the detection result of the detection unit 31 in the predetermined period T2 (step S44a). Then, the creation unit 36 creates the person's presence area detected by the detection unit 31 created immediately before the determination unit 35 determines that there is a light change as the virtual existence area of the person (step S44b).

  Note that step S44b may be performed simultaneously with step S44a.

  In step S44, when the predetermined period T2 has passed (YES in step S44), the determination unit 34 determines the presence / absence of a person based on the detection result of the presence / absence of the person in the detection unit 31 (step S45). .

  In step S46, if the predetermined period T3 longer than the predetermined period T2 has not elapsed (NO in step S46), the process returns to step S45.

  In step S46, when the predetermined period T3 has passed (YES in step S46), the creating unit 36 releases the virtual existence area created in step S44b (step S48) and returns to step S41.

  The predetermined period T2 and the predetermined period T3 may start counting simultaneously, or may start counting the predetermined period T3 ′ after the predetermined period T2 ends, for example. In this case, the length of the predetermined period T3 ′ may be set to a length obtained by subtracting the length of the predetermined period T2 from the length of the predetermined period T3.

  When the predetermined period T3 is longer than the predetermined period T2, after the predetermined period T2 ends, that is, after the rapid light change ends, the creation unit 36 does not immediately cancel the virtual existence area but releases it after a certain period of time. To do. Therefore, after the predetermined period T2 ends, even if the detection unit 31 detects that there is no person, the determination unit 34 does not immediately determine that there is no person, but only after the virtual existence area is released. Judge that there is no person. Thereby, after the end of the rapid light change, even if the person stays in the detection area of the analysis image or the movement is small, the determination unit 34 immediately detects the presence of the person. We do not judge that there is no person. That is, the determination unit 34 determines that there is no person when the detection unit 31 continuously detects that there is no person before the virtual existence area is released after the end of the rapid light change. To do. Therefore, the detection device 200 and the detection system 220 can determine the presence or absence of a person with higher accuracy.

  That is, the detection apparatus 200 further includes a creation unit 36 that creates an existence area surrounding the detected person in the detection area when the detection unit 31 detects that a person is present. When the determination unit 35 determines that there is a light change, the creation unit 36 performs a predetermined period T3 having a length equal to or longer than the predetermined period T2 based on the existence area created before the determination unit 35 determines that the light change is present. A virtual existence area that is virtual when a person exists is created. The determination unit 34 determines that there is a person when the virtual existence area exists.

  In short, when the detection unit 31 detects that a person is present, the creation unit 36 creates the person's presence area. In addition, when the determination unit 35 determines that there is a light change, the creation unit 36 creates a virtual existence region based on the existence region created by the creation unit 36 immediately before the determination unit 35 determines that there is a light change in the predetermined period T3. When the predetermined period T3 has passed, the created virtual existence area is released. Then, the determination unit 34 determines that there is a person if the virtual existence area exists. Therefore, when the detection device 200 and the detection system 220 cause an abrupt light change in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, the detection unit 31 may detect an error even if an error occurs in detection of the detection target. It can prevent judging that there is no person.

  In addition, for example, when a person is sitting on a chair, the amount of movement or movement of the person is smaller than when the person enters the detection area of the analysis image after entering the detection area of the analysis image. Is also envisaged. For example, when the movement amount or the movement amount of the person becomes smaller than a predetermined threshold after the creation unit 36 creates the existence region, the detection unit 31 within the detection region of the analysis image in the existence region. The presence or absence of a person may be detected with higher accuracy than other regions, for example, in units of pixels. In this case, the detection device 200 and the detection system 220 can detect the presence or absence of a person with higher accuracy.

  Note that the creation unit 36 may create a region larger than the existence region as a virtual existence region based on the existence region created immediately before the determination unit 35 determines that there is a light change. Further, the creation unit 36 may create an area that is shifted from the position of the existence area by a predetermined distance (for example, 10 pixels) in the movement direction of the person as a virtual existence area. It can also be assumed that the person detected by the detection unit 31 moves in the predetermined period T2. Accordingly, the creation unit 36 creates an area larger than the existence area, or an area that is shifted from the position of the existence area by a predetermined distance in the movement direction of the person as a virtual existence area, so that the detection unit 31 can detect the presence of the person with higher accuracy. The presence or absence of can be detected.

  In step S44a, the determination unit 34 has described that the detection result of the detection unit 31 is not adopted in the predetermined period T2 when the determination unit 35 determines that there is a light change. In the period T2, the detection unit 31 may stop the detection operation.

(Embodiment 3)
Hereinafter, the detection apparatus 300 and the detection system 320 according to Embodiment 3 of the present invention will be described. The detection device 300 and the detection system 320 are mainly different from the detection device 200 and the detection system 220 in that the deriving unit 33 derives the virtual movement distance of the person detected by the detection unit 31, the operation of the creation unit 36, Is different. When the detection unit 31 detects that there is a person between the end of the predetermined period T2 and the end of the predetermined period T3, the deriving unit 33 detects the virtual moving distance of the person detected by the detection unit 31 Is derived. In addition, about the structure similar to Embodiment 2, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  The deriving unit 33 detects the presence / absence of a person, and derives the moving speed of the person based on the movement state of the person detected by the detecting unit 31 in the predetermined period T4 (fourth predetermined period). To do. For example, the deriving unit 33 derives the distance between the center of the existence area in a certain frame and the center of the existence area in a frame that has passed a predetermined period T4 from the frame as the movement distance of the person. The value obtained by dividing by the predetermined period T4 is defined as the movement speed of the person. Then, the deriving unit 33 sets a value obtained by multiplying the derived movement speed of the person by the predetermined period T2 as a virtual movement distance.

  The predetermined period T4 may be a fixed period (for example, 0.2 seconds) stored in advance in the storage unit 32, or may be an interval between two consecutive frames (for example, 0.033 seconds).

  The deriving unit 33 may periodically update the movement speed of the person detected by the detection unit 31 until the determination unit 35 determines that there is a light change. For example, when the predetermined period T4 is set to an interval of two consecutive frames, the deriving unit 33 derives the movement speed of the person for each frame and stores it in the storage unit 32, and the determination unit 35 determines that there is a light change. A virtual movement distance is derived based on the movement speed of the person stored immediately before.

  When the detection unit 31 detects that there is a person after the predetermined period T2 ends, the creation unit 36 creates a new existence region in the detection region. At this time, the existence area (hereinafter referred to as “current existence area”) newly created by the creation unit 36 is created in an area different from the virtual existence area created in the predetermined period T2 in the detection area. Then, the creation unit 36 compares the distance between the current existence area and the virtual existence area created after the end of the predetermined period T2 with the virtual movement distance, and the distance between the current existence area and the virtual existence area is less than the virtual movement distance. If there is, release the virtual existence area and leave the existence area.

  As for the method for deriving the distance between the current existence area and the virtual existence area, for example, the deriving unit 33 calculates the distance between the center of the current existence area and the center of the virtual existence area between the current existence area and the virtual existence area. It may be derived as a distance. Further, the deriving unit 33 may derive the distance between the two points having the shortest distance between the virtual existence area and the current existence area as the distance between the current existence area and the virtual existence area.

  FIG. 5 is a flowchart illustrating an example of the operation of the detection apparatus 300. Step S51 is the same as step S45 of the second embodiment. That is, the flowchart of the operation of the detection apparatus 300 illustrated in FIG. 5 is a continuation of step S45 of the second embodiment.

  In step S52, when the detection unit 31 detects that there is a person (YES in step S52), the creation unit 36 creates a presence area (current existence area) of the detected person (step S53), and step S54. Proceed to Otherwise (NO in step S52), the process proceeds to step S56.

  In step S54, if the distance between the existence area (current existence area) and the virtual existence area is less than the virtual movement distance (YES in step S54), the creating unit 36 cancels the virtual existence area (step S55), Proceed to step S56. Otherwise, the process proceeds to step S56.

  In step S <b> 56, the determination unit 34 determines the presence / absence of a person based on the existence area (current existence area) or virtual existence area created by the creation unit 36. That is, the determination unit 34 determines that there is a person if at least one of the existence area (current existence area) and the virtual existence area exists, and both the existence area (current existence area) and the virtual existence area are determined. If both do not exist, it is determined that there is no person.

  After step S56, the detection apparatus 300 continues to detect the presence or absence of a person using the detection unit 31.

  Note that the creation unit 36 releases the virtual existence area after the predetermined period T3 has elapsed. Therefore, if there is no newly created existence area (current existence area) after the predetermined period T2 ends, the determination unit 34 determines that there is no person. At this time, if the predetermined period T3 is set longer than the predetermined period T2, even if the detection unit 31 detects that there is no person after the predetermined period T2, that is, after the period of rapid light change, The determination unit 34 does not immediately determine that there is no person. Even after the predetermined period T2 ends, that is, after the period of rapid light change ends, even if the detection unit 31 detects that there is no person, the determination unit 34 continues to detect human beings after a certain period of time. When it detects that there is no existence, it judges that there is no person.

  That is, as described above, after the end of the predetermined period T2, when the detection unit 31 detects that there is a person, the generation unit 36 newly creates an existing region as the current existing region in the detection region. Is preferred. In this case, it is preferable that the deriving unit 33 further derives the movement speed of the person in the predetermined period T4 and derives the virtual movement distance of the person in the predetermined period T2 based on the movement speed. In this case, after the end of the predetermined period T2, if the distance between the current existence area and the virtual existence area is less than the virtual movement distance, the creation unit 36 cancels the virtual existence area and releases the existing existence area. It is preferable to leave the existing area.

  Alternatively, the deriving unit 33 further derives the movement speed of the person before the determination unit 35 determines that the light change is present, and derives the virtual movement distance of the person in the predetermined period T2 based on the movement speed. Also good. In this case, after the end of the predetermined period T2, if the distance between the current existence area and the virtual existence area is less than the virtual movement distance, the creation unit 36 releases the virtual existence area and It is preferable to leave the current presence area.

  In short, the creation unit 36 releases the virtual existence region if the distance between the existence region (current existence region) created based on the detection result of the detection unit 31 and the virtual existence region is less than the virtual movement distance. Thereby, the detection apparatus 300 and the detection system 320 can know whether the person detected after the rapid light change occurs and the person detected before the sudden light change are the same person. That is, the detection apparatus 300 and the detection system 320 are more accurate than the detection apparatus 200 and the detection system 220 when a plurality of persons are present in the detection region of the analysis image after a rapid light change occurs. It is possible to detect the presence or absence of.

(Embodiment 4)
Hereinafter, the detection apparatus 400 and the detection system 420 according to Embodiment 4 of the present invention will be described. The detection device 400 and the detection system 420 are mainly different from the detection device 300 and the detection system 320 in that the creation unit 36 is based on the virtual moving distance between the end of the predetermined period T2 and the end of the predetermined period T3. Differ in that it expands the virtual existence area. In addition, about the structure similar to Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  The deriving unit 33 derives the virtual movement distance by the same procedure as that of the third embodiment. Then, when the predetermined period T <b> 2 ends, the creation unit 36 extends the virtual existence region in the movement direction of the virtual movement distance by an amount corresponding to the virtual movement distance. As for the moving direction, the direction of the moving speed of the person may be the moving direction, and a moving direction range that can be estimated from the direction of the moving speed of the person, for example, a range of 0 ° to ± 90 ° from the direction of the moving speed of the person. The moving direction may be set. In that case, the virtual existence area is extended by a part corresponding to the virtual movement distance in the range of 0 ° to ± 90 ° from the direction of the movement speed of the person.

  When the detection unit 31 detects that there is a person after the predetermined period T2 ends, the creation unit 36 creates a new existence region (current existence region). Then, the creation unit 36 compares the distance between the existence area (the current existence area) created after the predetermined period T2 ends and the virtual existence area after the area is expanded with the virtual movement distance, and is less than the virtual movement distance. If there is, the virtual existence area is released.

  FIG. 6 is a flowchart illustrating an example of the operation of the detection apparatus 400. Steps S61 and S63 to S67 are the same as steps S51 to S56 in FIG.

  In step S62, the creation unit 36 expands the virtual existence area based on the virtual movement distance derived by the deriving unit 33.

  Note that the order of step S62 is not limited. Step S62 may be between step S63 and step S64, for example. That is, the creation unit 36 may expand the virtual existence area based on the virtual movement distance after the detection unit 31 detects the presence or absence of a person. Further, step S62 may be between step S64 and step S65.

  In step S65, if the distance between the existence region created by the creation unit 36 in step S64 and the virtual existence region expanded in step S62 is less than the virtual movement distance (YES in step S65), the creation unit 36 The virtual existence area is canceled (step S66).

  That is, as described above, it is preferable that the deriving unit 33 further derives the movement speed of the person in the predetermined period T4 and derives the virtual movement distance of the person in the predetermined period T2 based on the movement speed. In this case, it is preferable that the creation unit 36 expands the virtual existence area based on the virtual movement distance after the end of the predetermined period T2.

  Alternatively, the deriving unit 33 may derive the virtual moving distance of the person based on the moving speed of the person before the determining unit 35 determines that the light change is present. In this case, it is preferable that the creation unit 36 expands the virtual existence area based on the virtual movement distance after the end of the predetermined period T2.

  In short, the deriving unit 33 derives the virtual movement distance in the predetermined period T2 of the person detected by the detection unit 31 before the determination unit 35 determines that there is a light change. After the predetermined period T2 ends, that is, after the light change state determined by the determination unit 35 ends, the creation unit 36 virtually exists based on the virtual movement distance in the direction of the movement speed of the person detected by the detection unit 31. By expanding the area, it is possible to further specify the person's existing area. Therefore, the detection device 400 and the detection system 420 can detect the presence or absence of a person with higher accuracy than the detection device 300 and the detection system 320.

(Embodiment 5)
Hereinafter, a detection apparatus 500 and a detection system 520 according to Embodiment 5 of the present invention will be described with reference to FIGS. The detection device 500 and the detection system 520 are mainly different from the detection device 200 and the detection system 220 in that the detection unit 31 has a movement detection mode and a stay detection mode, and the operation of the creation unit 36. In addition, about the structure similar to Embodiment 2, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  In the detection device 500 and the detection system 520, the creation unit 36 has a function of creating a presence region surrounding the detected person in the detection region when the detection unit 31 detects that there is a person. It does not have a function of creating a virtual existence area. That is, even when the determination unit 35 determines that there is a light change, the creation unit 36 does not create a virtual existence region based on the existence region created by the creation unit 36 immediately before the determination unit 35 determines that there is a light change. Therefore, the detection device 500 and the detection system 520 do not have a function for the determination unit 34 to determine that there is a person when a virtual existence region exists.

  As the detection mode, the detection unit 31 is based on a movement detection mode that detects the presence or absence of a person in the detection area of the analysis image, and a person's movement amount in a stay area that is a stagnation in the detection area. A stay detection mode for detecting the presence or absence of a person. When the detection unit 31 determines that there is a presence region in the detection region and the determination unit 35 determines that there is a light change during operation in the movement detection mode, the detection mode is changed from the movement detection mode to the stay detection at least for a predetermined period T2. Switch to mode.

  Here, as long as the detection unit 31 operates in the movement detection mode, the creation unit 36 detects the position by updating the position of the existence region as the person moves within the detection region of the analysis image of the detection device 100. The position of a person in the area is tracked in the existing area. That is, in the movement detection mode, the detection unit 31 detects the presence / absence of a person over the entire detection area, and continues by tracking the position of the person even when the person moves greatly within the detection area. The presence or absence of the person is detected. On the other hand, in the stay detection mode, the detection unit 31 targets a stay area that is a stay area that is stagnant in the detection area, that is, a stay area that is a presence area in which the position in the detection area is fixed. Detect presence or absence. Therefore, in the stay detection mode, the detection unit 31 detects the slight movement of the person in the stay area even when the person is stopped at one place in the detection area (stagnation). The presence or absence of a person can be detected.

  However, the detection unit 31 does not completely switch between the movement detection mode and the stay detection mode, but basically operates in the movement detection mode. When the stay area appears in the detection area (when the stagnation of the existing area occurs), the detection unit 31 detects the presence or absence of a person in the stay detection mode only in the stay area. The area detects the presence or absence of a person in the movement detection mode. That is, when the stay area appears in the detection area, the detection unit 31 partially sets the detection mode to the stay detection mode only for the stay area, and the detection mode is completely changed from the movement detection mode to the stay detection mode. It doesn't switch.

  In addition, the detection method of the presence / absence of a person in the movement detection mode in the detection unit 31, that is, the detection method of the presence / absence of a person in the detection unit 31 used for creating the existence area in the creation unit 36 is particularly limited. Instead, a conventional human detection technique may be used. For example, it may be a method of detecting the presence of a person using background difference, or a method of detecting the presence of a person by deriving the amount of movement of the person in the detection area of the analysis image using a difference between frames. Good.

  Hereinafter, switching of the detection mode of the detection unit 31 will be described with reference to FIG. FIG. 8 is a flowchart illustrating an example of the operation of the detection apparatus 500.

  In step S81, the detection unit 31 starts an operation in the movement detection mode, that is, detection of the presence or absence of a person in the detection area, and proceeds to step S82. In step S82, the detection unit 31 also determines the presence / absence of a presence region in the detection region, and when the determination unit 35 determines that there is a presence region in the detection region and the operation is being performed in the movement detection mode. Only, the process proceeds to step S83. In step S82, the detection unit 31 acquires the determination result of the presence or absence of a light change from the determination unit 35. If the determination unit 35 does not determine that there is a light change (NO in step S82), the operation in the movement detection mode. Continue. If the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode (YES in step S82), the detection unit 31 changes the detection mode from the movement detection mode to the stay detection mode at least for a predetermined period T2. Switching (step S83), the process proceeds to step S84. However, in step S82, the detection unit 31 also determines the presence / absence of a presence region in the detection region, and the determination unit 35 determines that there is a presence region in the detection region and the light is changed while operating in the movement detection mode. Only in the case that the process has been performed, the process proceeds to step S83. Here, it is assumed that the predetermined period T2 is a period from when the determination unit 35 determines that there is a light change to when it is determined that the light change ends, that is, a variable length period.

  In step S84, the detection unit 31 acquires the determination result of the presence / absence of light change from the determination unit 35, and the determination unit 35 determines that there is a light change (YES in step S84) in the stay detection mode. Continue operation. In other words, the detection unit 31 maintains the detection mode in the stay detection mode in at least a period from when the determination unit 35 determines that there is a light change to when it is determined that the light change ends, that is, for a predetermined period T2. If it is determined that there is a light change, the determination unit 34 maintains the determination result before the start of the predetermined period T2 without adopting the detection result of the detection unit 31 during the predetermined period T2. Regardless of the detection mode of the detection unit 31, the determination result of the determination unit 34 does not change.

  When the determination unit 35 determines that the light change has ended (NO in step S84), the predetermined period T2 ends. Therefore, the determination unit 34 is based on the detection result of the detection unit 31 operating in the stay detection mode. It is determined whether or not there is (step S85). As will be described in detail later, in the detection device 500, the determination unit 34 determines “moving state” when the detection unit 31 determines that there is a person in the movement detection mode, and the detection unit 31 operates in the stay detection mode. If it is determined that there is a person, it is determined as “stay state”. That is, the determination result of the determination unit 34 varies depending on the detection mode of the detection unit 31. Therefore, when the detection unit 31 is operating in the stay detection mode, the determination unit 34 performs stay detection to determine whether or not the “stay state” is present, and in this state, the detection unit 31 indicates that there is a person. If it is detected (YES in step S85), it is determined as “stay state” (step S86).

  On the other hand, when it is determined that there is no person in the stay area in the stay detection mode (NO in step S85), the detection unit 31 switches the detection mode from the stay detection mode to the movement detection mode (step S87). Return to S82. As will be described in detail later, when the state in which no person is present in the stay detection mode continues for a predetermined time Q, the detection unit 31 determines that there is no person in the stay region, and shifts from the stay detection mode to the movement detection mode. Switch.

  By the way, the deriving unit 33 derives the amount of movement of the person in the stay area during the predetermined period. The deriving unit 33 derives the position change amount of the existing area within the detection area during the predetermined period. For convenience of explanation, the above-mentioned “predetermined period” will be described as a frame interval between two consecutive frames of the analysis image captured by the imaging unit 2, but the present invention is not limited thereto, and for example, a preset period may be used. . In addition, the predetermined period for deriving the amount of movement of the person in the stay area and the predetermined period for deriving the position change amount of the existing area may be the same period or different periods.

  In the movement detection mode, when the position change amount of the existence area in the detection area becomes less than the stagnation threshold “I”, the detection unit 31 fixes the position of the existence area in the detection area and stays in the existence area. As an area, the presence / absence of a person is detected in the stay detection mode for the stay area. That is, the stay area is an existence area that is considered to be stagnant in the detection area because the amount of change in position in the detection area is less than the stagnation threshold “I”. As described above, the detection unit 31 basically switches the detection mode from the movement detection mode to the stay detection mode based on the position change amount of the existence region in the detection region.

  However, when the detection unit 31 determines that there is a light change during operation in the movement detection mode, and the detection mode is switched from the movement detection mode to the stay detection mode, the detection unit 31 depends on the position change amount of the existing region. Without switching from the movement detection mode to the stay detection mode. That is, when the detection unit 31 determines that there is a presence region in the detection region and the determination unit 35 determines that there is a light change while operating in the movement detection mode, the detection unit 31 is affected by the position change amount of the presence region at least during the predetermined period T2. Instead, the existing area is the stay area. And the detection part 31 detects the presence or absence of a person in the stay detection mode about the said stay area. Thereby, when the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode, the detection mode of the detection unit 31 is switched from the movement detection mode to the stay detection mode.

  9A, FIG. 9B, FIG. 10A, and FIG. 10B are described below with respect to the creation method of the existence region of the creation unit 36 and the derivation method of the amount of movement of the person within the stay region and the positional change amount of the existence region. Will be described.

  9A and 9B are conceptual diagrams illustrating an example of the existence region 22 created by the creation unit 36 and an example of the position deriving unit 33 deriving the positional change amount of the existence region 22. 9A and 9B are diagrams showing the detection region 21 of the analysis image of two consecutive frames.

  As shown in FIG. 9A, when the detection unit 31 detects the presence of a person in the movement detection mode, the creation unit 36 creates a rectangular presence region 22 based on the width and height of the person. Then, the analysis image is created so as to surround the person. That is, the existence area 22 is an area created so as to include a person detected by the detection unit 31 in the detection area 21 of the analysis image.

  FIG. 9B shows the next frame of FIG. 9A. In this case, the existence area 22 moves from the existence area 22a in FIG. 9A to the existence area 22b in FIG. 9B in order to assume that a person is moving. To do.

  The deriving unit 33 calculates the distance L1 between the center of the existence area 22a and the center of 22b, and derives the distance L1 as the position change amount of the existence area 22.

  The detection unit 31 compares the position change amount derived by the deriving unit 33 with the stagnation threshold “I” stored in the storage unit 32 in the movement detection mode. When the position change amount is equal to or greater than the stagnation threshold “I”, the detection unit 31 detects the presence or absence of a person in the movement detection mode, and partially detects when the position change amount is less than the stagnation threshold “I”. The mode is the stay detection mode.

  The creation unit 36 updates the position of the existence region 22 as the person moves in the detection region 21 of the analysis image of the detection device 100 so that the detection unit 31 tracks the person in the detection region of the analysis image. Can do. In the movement detection mode, the detection unit 31 detects that there is a person in the detection area 21 if the existence area 22 exists in the detection area 21 in the analysis image, and the existence area 22 exists in the detection area 21. If not, it is detected that there is no person in the detection area 21. That is, in both cases of FIG. 9A and FIG. 9B, the detection unit 31 detects the presence of a person.

  10A and 10B are conceptual diagrams illustrating an example in which the deriving unit 33 derives the amount of human movement when the detection apparatus 100 detects the presence or absence of a person in the stay detection mode. 10A and 10B are diagrams showing stay areas 23a and 23b of two consecutive frames. In FIG. 10A and FIG. 10B, since the existence area is stagnant in the detection area 21, the existence areas indicated by “23 a” and “23 b” are both stay areas 23.

  As shown in FIGS. 10A and 10B, in the stay detection mode, the detection unit 31 detects the presence or absence of a person based on the amount of movement of the person in the staying area, that is, the stay area 23. As shown in FIGS. 10A and 10B, when the movement of a person changes from the stay area 23a of FIG. 10A to the stay area 23b of FIG. 10B, the luminance of the pixels in the stay areas 23a and 23b varies with the movement of the person. Change based on.

  The deriving unit 33 derives the amount of human movement in the stay area 23 (stay areas 23a and 23b) in a predetermined period. That is, the deriving unit 33 derives, as the amount of human movement, the number of pixels having a luminance change amount from the stay region 23a of the stay region 23b that is equal to or greater than the deriving threshold “K” stored in the storage unit 32. To do.

  In the stay detection mode, the detection unit 31 derives the amount of human movement by the deriving unit 33 to compare the amount of human movement with the detection threshold “T” stored in the storage unit 32. If the amount of movement of the person is equal to or greater than the detection threshold “T”, the detection unit 31 determines that there is a person. The detection unit 31 determines that there is no person if the movement amount of the person is less than the detection threshold “T”. That is, in the stay detection mode, the detection unit 31 determines that there is no person if the amount of human movement is less than the detection threshold “T”, and if the amount of human movement is equal to or greater than the detection threshold “T”. Determine that there is a person.

  However, in the stay detection mode, the detection unit 31 does not immediately determine that there is no person if the amount of movement of the person is less than the detection threshold “T”. It is determined that there is no person until the state less than T ″ continues for a predetermined period Q. That is, in the stay detection mode, the presence or absence of a person in the stay detection mode is more accurately determined by determining that there is no person when the detection unit 31 detects that there is no person continuously for a predetermined period Q. Highly detectable.

  Here, when it is determined that there is no person in the stay area in the stay detection mode, the detection unit 31 cancels the stay area and switches the detection mode in the stay area from the stay detection mode to the movement detection mode. That is, when the detection unit 31 determines that there is no person in the stay detection mode after the end of the second predetermined period, the detection unit 31 releases the stay area and switches the detection mode from the stay detection mode to the movement detection mode. Therefore, in the stay detection mode, when the state where the amount of movement of the person in the stay area is less than the detection threshold “T” continues for a predetermined period Q, the detection unit 31 determines that there is no person and stay detection Switch from mode to movement detection mode.

  In addition, the cancellation | release of a stay area here means deleting the stay area set in the detection area. When the stay area is canceled, the detection unit 31 may return the stay area to the existing area, or may simply cancel the setting of the stay area without returning the stay area to the existing area. In the former case, when the stay area is released, an existing area instead of the stay area appears at the same position as the stay area in the detection area. In the latter case, when the stay area is released, neither the stay area nor the existing area remains at the same position as the stay area in the detection area.

  In addition, in a state where stay areas are set at a plurality of locations in the detection area, the detection unit 31 may perform switching from the stay detection mode to the movement detection mode for each stay area or all stays. It may be performed simultaneously for the region.

  In short, when a certain time has passed without detecting the presence of a person in the stay area, the stay area is released. As a result, since the stay area determined to have no person is released and switched to the movement detection mode, the detection unit 31 detects the presence or absence of a person in the stay detection mode indefinitely for the stay area in which no person exists. Can be avoided.

  The deriving unit 33 does not necessarily use the center of the existence area 22 as a reference point when deriving the position change amount of the existence area 22 in the detection area 21. That is, for example, the derivation unit 33 may be configured to calculate the distance between the representative points of the existence area 22 before and after moving and derive this distance as the position change amount of the existence area 22. The representative points here are, for example, the center of gravity and vertex of the existence area 22.

  Further, the detection unit 31 is not limited to the configuration in which the detection mode is switched from the movement detection mode to the stay detection mode as soon as the position change amount derived by the deriving unit 33 becomes equal to or greater than the stagnation threshold “I”. For example, the detection unit 31 sets a frame whose position change amount of the existence area 22 in the detection area 21 when compared with the immediately preceding frame is less than the stagnation threshold “I” as a stagnation candidate, and becomes a stagnation candidate frame. May switch to the stay detection mode when the specified number of frames continues. In this case, the detection unit 31 counts the number of frames that are stagnation candidates during operation in the movement detection mode, and switches the detection mode to the stay detection mode when the count value (number of frames) reaches the specified number of frames. In this case, the count value is reset when the position change amount derived by the deriving unit 33 is equal to or greater than the stagnation threshold “I” before the count value reaches the specified number of frames. As a result, the detection unit 31 starts detection in the stay detection mode only when the person stays in the detection area 21 for a while and uses the presence area 22 corresponding to the person as the stay area.

  In addition, when the detection area 21 of the analysis image is a partial area of the image captured by the imaging unit 2, the detection unit 31 includes the presence or absence of a person included in the analysis image even outside the detection area 21. Is detected. When the detection unit 31 detects the presence of a person outside the detection region 21, the creation unit 36 creates a presence region 22 that surrounds the person. Thereby, when a person enters the detection area 21 from outside the detection area 21, the existence area 22 enters the detection area 21 from outside the detection area 21 in the analysis image so as to track the person. Therefore, the detection unit 31 may be configured to detect the presence / absence of a person in the detection region 21 based on the presence / absence of the presence region 22 in the detection region 21 in the movement detection mode. Thereby, the detection part 31 can distinguish and detect the person in the detection area 21 and the person outside the detection area 21. Note that the detection unit 31 preferably determines that the presence region 22 exists in the detection region 21 when the presence region 22 partially overlaps the detection region 21.

  In this case, the detection unit 31 operates in the movement detection mode only when the presence area 22 exists in the detection area 21, and is different from the movement detection mode if the presence area 22 does not exist in the detection area 21. Operates in the entry detection mode. The detection unit 31 basically operates in the same manner as the movement detection mode even in the entry detection mode. However, in the entry detection mode, there is no presence area 22 located in the detection area 21, so the presence area 22 is set as the stay area. There is nothing. Therefore, in the approach detection mode, the detection unit 31 does not directly switch the detection mode to the stay detection mode. That is, the detection mode that can be directly switched from the entry detection mode is only the movement detection mode, and the entry detection mode is switched to the stay detection mode through the movement detection mode.

  The determination unit 34 outputs different determination results when the detection unit 31 determines that there is a person in the stay detection mode and when it is determined that there is a person in the movement detection mode. That is, when the detection unit 31 detects that there is a person in the detection region 21, the final determination result in the determination unit 34 differs depending on whether the detection mode of the detection unit 31 is the stay detection mode or the movement detection mode. ing. Specifically, the determination unit 34 determines “moving state” when the detection unit 31 detects that there is a person in the movement detection mode, and determines that the detection unit 31 has a person in the stay detection mode. When detected, it is determined as “stay state”. And the detection apparatus 100 outputs a determination result in the form which can distinguish whether the person in the detection area | region 21 is moving (it is in a moving state), or is staying (it is in a staying state). By doing so, the detection apparatus 500 can control the load 5 according to a person's movement and stay.

  Note that, when the determination results of both “movement state” and “stay state” are obtained in duplicate, the detection apparatus 500 preferentially adopts the determination result of “stay state”, for example. When the detection unit 31 detects that no person is present in either the movement detection mode or the stay detection mode, the determination unit 34 determines “absence state”.

  Furthermore, when there is an existing area in the detection area, and the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode, the detection mode is switched from the movement detection mode to the stay detection mode. In the period T2, the determination unit 34 determines “moving state”. In this case, when the detection unit 31 determines that there is a person in the stay detection mode after the end of the predetermined period T2, the determination unit 34 determines “stay state”. That is, when there is an existing area in the detection area and the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode, the determination unit 34 detects the detection unit 31 at least for a predetermined period T2. The determination result before the start of the predetermined period T2 is maintained without adopting the result. Therefore, the determination unit 34 determines “moving state” at least during the predetermined period T2. Then, the determination unit 34 determines the “stay state” only after the detection unit 31 determines that there is a person in the stay detection mode after the end of the predetermined period T2.

  In short, when the determination unit 35 determines that there is a light change, even if the detection mode of the detection unit 31 is switched from the movement detection mode to the stay detection mode, the determination unit 34 immediately “stays” after the end of the predetermined period T2. It is not judged as “state”. Therefore, when a sudden light change occurs in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, even if an error occurs in detection of the detection target by the detection unit 31, it is not easily influenced by the determination unit 34. The determination can be made by distinguishing between “movement state” and “stay state”.

  Hereinafter, the operation of the control unit 3 when there is an existing region in the detection region and the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode will be described with reference to FIGS. To do. Each of FIGS. 11 to 13 shows a certain period before and after the load 5 (illumination device) shifts from “off” to “on” as a person enters the detection area 21 from outside the detection area 21. An analysis image to be captured is shown. FIGS. 11 to 13 show the time change of the illuminance of the subject of the imaging unit 2 with the horizontal axis as the time axis in the upper stage, and the analysis images at each time point in the time points t1 to t4 in the lower stage. 11 to 13 assume a case where a person 70 moving in the office is imaged from above by the imaging unit 2 attached to the ceiling of the office.

  FIG. 11 shows an example where the person 70 continues to move toward the center of the detection area 21 after entering the detection area 21 from outside the detection area 21.

  In the example of FIG. 11, since the person 70 does not exist in the detection area 21 at the time point t1, the illumination device that is the load 5 is turned off. At this time, since the person 70 exists in the field of view of the imaging unit 2, the detection unit 31 operates in the approach detection mode to detect the presence of the person 70 in the analysis image, and the creation unit 36 The existence area 22 is created so as to surround the person 70.

  Since the presence area 22 enters the detection area 21 at time t2, the detection unit 31 switches the detection mode from the entry detection mode to the movement detection mode, and detects the presence of the person 70 in the detection area 21. Therefore, at time t2, the determination unit 34 receives the detection result of the detection unit 31 and determines that there is a person 70, and the control unit 3 determines the lighting device that is the load 5 based on the determination result of the determination unit 34. Control to light up. Thereby, for a while from the time t2, the illuminance of the subject of the imaging unit 2 increases with time, and an abrupt light change occurs in the analysis image captured by the imaging unit 2.

  Therefore, the determination unit 35 determines that there is a light change over a predetermined period T2 from the time t3 immediately after the time t2 until the illuminance becomes stable (no light change occurs). Therefore, since the presence area 22 exists in the detection area 21 and the determination section 35 determines that there is a light change while the detection section 31 is operating in the movement detection mode, the position of the presence area 22 in the detection area 21 is determined. Is fixed and the presence area 22 becomes the stay area 23. Thereby, at time t3, the detection mode of the detection unit 31 is switched from the movement detection mode to the stay detection mode.

  Since the detection unit 31 operates in the stay detection mode for a predetermined period T2, the position of the stay region 23 in the detection region 21 is also at the time t4 when the illuminance of the subject of the imaging unit 2 is stabilized and the predetermined period T2 ends. It is the same as time t3. In the example of FIG. 11, the person 70 does not exist in the stay area 23 at the time t <b> 4 and has moved to a position closer to the center of the detection area 21 than the stay area 23. Therefore, the state where the amount of human movement in the stay area 23 is less than the detection threshold “T” continues for a predetermined period Q, and the detection unit 31 cancels the stay area 23 and switches from the stay detection mode to the movement detection mode. Switch. On the other hand, since the detection unit 31 detects the presence of the person 70 in the detection area 21 in the movement detection mode, the creation unit 36 creates the existence area 22 so as to surround the person 70.

  As a result, when the determination unit 34 determines “moving state” at time t2, the determination unit 34 continues to determine “moving state” after time t4.

  FIG. 12 is an example of a case where the person 70 has stopped (stagnate) on the spot after entering the detection area 21 from outside the detection area 21. In the example of FIG. 12, the time t1 to t3 is the same as that of the example of FIG.

  Since the detection unit 31 operates in the stay detection mode for a predetermined period T2, the position of the stay region 23 in the detection region 21 is also at the time t4 when the illuminance of the subject of the imaging unit 2 is stabilized and the predetermined period T2 ends. It is the same as time t3. In the example of FIG. 12, the person 70 exists in the stay area 23 even at time t4. Therefore, when the movement amount of the person in the stay area 23 is equal to or greater than the detection threshold “T”, the detection unit 31 determines that there is a person in the stay detection mode, and continues the operation in the stay detection mode.

  As a result, when the determination unit 34 determines “moving state” at time t2, the determination unit 34 continues to determine “moving state” until time t4 when the predetermined period T2 ends, and in the stay area 23 after time t4. As soon as the amount of movement of the person exceeds the detection threshold “T”, it is determined as “stay state”.

  FIG. 13 shows an example of a case where the person 70 moves from the outside of the detection area 21 into the detection area 21 and then immediately moves away from the detection area 21. In the example of FIG. 13, the time t1 to t3 is the same as that of the example of FIGS.

  Since the detection unit 31 operates in the stay detection mode for a predetermined period T2, the position of the stay region 23 in the detection region 21 is also at the time t4 when the illuminance of the subject of the imaging unit 2 is stabilized and the predetermined period T2 ends. It is the same as time t3. In the example of FIG. 13, the person 70 does not exist in the stay area 23 at the time t <b> 4, and further moves outside the detection area 21. Therefore, the state where the amount of human movement in the stay area 23 is less than the detection threshold “T” continues for a predetermined period Q, and the detection unit 31 cancels the stay area 23 and switches from the stay detection mode to the movement detection mode. Switch. On the other hand, the detection unit 31 switches from the movement detection mode to the entry detection mode in order to detect the absence of the person 70 in the detection area 21 in the movement detection mode. The detection unit 31 operates in the approach detection mode to detect the presence of the person 70 in the analysis image, and the creation unit 36 creates the presence area 22 so as to surround the person 70.

  As a result, when the determination unit 34 determines “moving state” at time t2, the determination unit 34 continues to determine “moving state” until time t4 when the predetermined period T2 ends, and within the detection region 21 after time t4. Therefore, it is determined that there is no person, that is, “absent state”.

  Incidentally, the detection apparatus 500 according to the fifth embodiment further includes an infrared detection unit 6 and a determination unit 4 in addition to the above-described configuration. The infrared detector 6 detects the presence or absence of a person in the detection area 21 based on a change in the amount of received infrared light. Based on the determination result of the determination unit 34 and the detection result of the infrared detection unit 6, the determination unit 4 determines whether or not there is a person in the detection area. Here, when the infrared detecting unit 6 detects that there is a person in the predetermined period T2, the determining unit 4 gives priority to the detection result of the infrared detecting unit 6 over the determination result of the determining unit 34. Confirm the presence / absence of the person inside.

  More specifically, the infrared detector 6 is a passive sensor that detects the presence of a person by detecting a change in the amount of received infrared light emitted from a person, such as a pyroelectric infrared sensor. This type of differential infrared detection unit 6 detects a person who is moving (stagnation) without detecting because the amount of received infrared light does not change. The infrared light receiving range of the infrared detecting unit 6 is set in accordance with the detection region of the analysis image captured by the imaging unit 2. The determination unit 4 is an arithmetic processing device such as a microcomputer (microcomputer), for example. The determination unit 4 is connected to both the control unit 3 and the infrared detection unit 6, and based on both the determination result of the determination unit 34 and the detection result of the infrared detection unit 6, the presence of a person in the detection region Confirm the presence or absence of. The detection device 500 controls the load 5 based on the determination of the presence / absence of a person in the detection area determined by the determination unit 4.

  At regular times, the determination unit 4 prioritizes the determination result of the determination unit 34 over the detection result of the infrared detection unit 6 and determines the determination of the presence or absence of a person in the detection area 21. On the other hand, when the determination unit 35 determines that there is a light change, the determination unit 4 determines the detection result of the infrared detection unit 6 when the infrared detection unit 6 detects that there is a person in the predetermined period T2. The determination of the presence / absence of a person in the detection area 21 is confirmed with priority over the determination result of the unit 34. That is, since the determination unit 34 does not adopt the detection result of the detection unit 31 in the predetermined period T2, the determination unit 4 prioritizes the detection result of the infrared detection unit 6 to determine the presence of a person in the detection region 21. The presence or absence can be continuously determined.

  Here, it is preferable that the control unit 3 is configured to be able to acquire the detection result of the infrared detection unit 6 through the determination unit 4. The control unit 3 estimates whether or not a person has moved during the predetermined period T2 by acquiring the detection result of the infrared detection unit 6 during the predetermined period T2, and thereby sets the detection mode of the detection unit 31 as the stay detection mode. Switching between the movement detection modes is possible. That is, it is assumed that the detection unit 31 switches the detection mode from the movement detection mode to the stay detection mode in the predetermined period T2. In this case, when the infrared detection unit 6 detects that the person is present due to the movement of the person, the detection unit 31 cancels the stay area and changes the detection mode in the stay area from the stay detection mode to the movement detection mode. Switch. On the other hand, when the person does not move and the infrared detection unit 6 is absent, the detection unit 31 continues the operation in the stay detection mode.

  As described above, the detection device 500 and the detection system 520 according to the fifth embodiment, when the detection unit 31 detects that there is a person, creates a presence area surrounding the detected person in the detection area 36. have. The detection unit 31 detects the presence / absence of a person based on a movement detection mode for detecting the presence / absence of a person in the detection area and the amount of movement of the person in the stay area including the existence area stagnated in the detection area. And a stay detection mode. When the detection unit 31 determines that there is a presence area in the detection region and the determination unit 35 determines that there is a light change during operation in the movement detection mode, the detection mode is changed from the movement detection mode to the stay detection mode at least for a predetermined period T2. Switch.

  Therefore, when an abrupt light change occurs in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, even if an error occurs in detection of the detection target by the detection unit 31, it is not easily affected by this. It can be determined whether or not there is. In particular, even when a person stagnates in the detection region during the occurrence of a sudden light change, the detection unit 31 forcibly shifts to the stay detection mode, and thus can detect without losing sight of the person. Therefore, the detection device 500 and the detection system 520 can suppress erroneous determination of the presence or absence of a person even if, for example, overexposure occurs due to a rapid light change in the detection region of the analysis image.

  In the movement detection mode, the detection unit 31 fixes the position of the existence area in the detection area and sets the existence area as the stay area when the position change amount of the existence area in the detection area becomes less than the stagnation threshold “I”. It is preferable to detect the presence or absence of a person in the stay detection mode for the stay area. Here, in the case where the detection mode is switched from the movement detection mode to the stay detection mode triggered by the determination unit 35 determining that there is a light change, the detection unit 31 changes the position change amount of the existing region at least during the predetermined period T2. Regardless of whether the present area is the stay area. And it is preferable that the detection part 31 detects the presence or absence of a person in the stay detection mode about the said stay area | region.

  According to this configuration, the detection unit 31 shifts to the stay detection mode when the position change amount of the existing region becomes less than the stagnation threshold value “I” in a steady state, whereas the determination unit 35 determines that there is a light change. Shifts to the stay detection mode regardless of the position change amount of the existence area. Therefore, when a sudden light change occurs in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, even if an error occurs in detection of the detection target by the detection unit 31, it is not easily affected by this, and the detection unit 31 stays there. It is possible to shift to the detection mode. This configuration is not an essential configuration and can be omitted as appropriate.

  In addition, as described above, when the detection unit 31 determines that the presence of a person is present in the movement detection mode, the determination unit 34 determines that the person is present in the movement detection mode. If it is determined that there is, it is preferable to determine that it is a staying state. Here, when the detection mode of the detection unit 31 switches from the movement detection mode to the stay detection mode triggered by the determination unit 35 determining that there is a light change, the determination unit 34 is in the movement state at least for a predetermined period T2. It is preferable to judge. In this case, when the detection unit 31 determines that there is a person in the stay detection mode after the predetermined period T2, the determination unit 34 preferably determines the stay state.

  According to this configuration, when the determination unit 35 determines that there is a light change, even if the detection mode of the detection unit 31 is switched from the movement detection mode to the stay detection mode, the determination unit 34 is configured after the predetermined period T2 ends. It is not immediately judged as “stay state”. Therefore, when a sudden light change occurs in the analysis image due to switching of the operation mode of the load 5 or due to disturbance, even if an error occurs in detection of the detection target by the detection unit 31, it is not easily influenced by the determination unit 34. The determination can be made by distinguishing between “movement state” and “stay state”. This configuration is not an essential configuration and can be omitted as appropriate.

  In addition, when there is a presence area in the detection area and the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode, the detection mode is switched to the stay detection mode, and the infrared detection unit 6 and The point provided with the determination part 4 is not restricted to what is employ | adopted together. That is, when there is a presence area in the detection area and the determination unit 35 determines that there is a light change while the detection unit 31 is operating in the movement detection mode, the detection mode is switched to the stay detection mode, and the infrared detection unit 6 and Only one of the points provided with the determination unit 4 may be adopted.

(Program and detection method)
The control unit 3 of the detection apparatus as described above can be realized by causing a computer to execute an appropriate program. That is, this program is a program for causing a computer to function as a detection device, and is provided, for example, by being recorded on a recording medium or via an electric communication line. The detection device herein includes a detection unit 31, a determination unit 34, a derivation unit 33, and a determination unit 35. The detection unit 31 detects the presence or absence of a person in the detection area of the analysis image. The determination unit 34 determines the presence or absence of a person based on the detection result of the detection unit 31. The deriving unit 33 derives the size of the luminance change area in which the luminance change amount in the predetermined period T1 is equal to or greater than the first threshold in the detection area. The determination unit 35 determines that there is a light change if the size of the luminance change region is equal to or greater than the second threshold. When the determination unit 35 determines that there is a light change, the detection unit 31 stops the detection operation in the predetermined period T2, or the determination unit 34 does not adopt the detection result of the detection unit 31 in the predetermined period T2. The determination result before the start of the period T2 is maintained.

  Further, by using this type of detection device, the following detection method can be realized. That is, the detection method referred to here includes a detection stage, a determination stage, a derivation stage, and a determination stage. In the detection stage, the presence or absence of a person in the detection area of the analysis image is detected. In the determination stage, the presence or absence of a person is determined based on the detection result in the detection stage. In the derivation stage, the size of the luminance change area in which the luminance change amount in the predetermined period T1 is not less than the first threshold in the detection area is derived. In the determination step, it is determined that there is a light change if the size of the luminance change region is equal to or greater than the second threshold. When it is determined that there is a light change at the determination stage, the detection operation is stopped at the detection stage in the predetermined period T2, or the predetermined period T2 is started without adopting the detection result at the determination stage in the predetermined period T2. Maintain previous judgment results.

(Conclusion)
As described above, the embodiments have been described as examples of the technology in the present invention. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this invention, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

100, 200, 300, 400, 500 Detection device 120, 220, 320, 420, 520 Detection system 2 Imaging unit 3 Control unit 31 Detection unit 32 Storage unit 33 Derivation unit 34 Judgment unit 35 Judgment unit 36 Creation unit 4 Determination unit 5 Load 6 Infrared detector

Claims (11)

An imaging unit;
A detection unit for detecting presence or absence of a person in a detection region of an analysis image captured by the imaging unit;
Based on the detection result of the detection unit, a determination unit that determines the presence or absence of a person,
A deriving unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than a first threshold in the detection region;
A determination unit that determines that there is a light change if the size of the luminance change region is equal to or greater than a second threshold,
When the determination unit determines that the light change is present, the detection unit stops the detection operation in the second predetermined period, or the determination unit displays the detection result of the detection unit in the second predetermined period. A detection device that maintains the determination result before the start of the second predetermined period without adopting the second predetermined period. When the detection unit detects that a person is present, the detection unit further includes a creation unit that creates a presence area surrounding the detected person in the detection area;
When the determination unit determines that there is the light change,
The creating unit
A virtual existence area that is hypothesized that a person exists in a third predetermined period that is longer than the second predetermined period based on the existence area created before the determination unit determines that there is a light change. Create
The determination unit
The detection apparatus according to claim 1, wherein when there is the virtual existence area, it is determined that there is a person. When the detection unit detects that a person is present, the detection unit further includes a creation unit that creates a presence area surrounding the detected person in the detection area;
The detector is
A movement detection mode for detecting the presence or absence of a person in the detection area;
A stay detection mode for detecting the presence or absence of a person based on the amount of movement of the person in the stay area consisting of the existence area stagnated in the detection area, and
When the presence area is within the detection area and the determination unit determines that the light has changed during operation in the movement detection mode, the detection mode is changed from the movement detection mode to the detection period at least in the second predetermined period. It switches to stay detection mode. The detection device according to claim 1 characterized by things. The detector is
In the movement detection mode, when the position change amount of the existence area in the detection area becomes less than a stagnation threshold, the position of the existence area in the detection area is fixed, and the existence area is set as the stay area. Detect the presence or absence of a person in the stay detection mode for the stay area,
When the detection mode is switched from the movement detection mode to the stay detection mode triggered by the determination unit determining that the light change is present,
At least in the second predetermined period, the presence area is set as the stay area regardless of the position change amount of the presence area, and the presence / absence of a person is detected in the stay detection mode for the stay area. The detection device according to claim 3. The determination unit
If the detection unit determines that there is a person in the movement detection mode, it is determined as a movement state,
When the detection unit determines that there is a person in the stay detection mode, it is determined as a stay state,
When the determination unit switches from the movement detection mode to the stay detection mode triggered by the determination unit determining that the light change is present,
At least in the second predetermined period, the determination unit determines that the movement state,
5. The determination unit according to claim 3, wherein when the detection unit determines that there is a person in the stay detection mode after the end of the second predetermined period, the determination unit determines the stay state. Detection device. The detector is
When it is determined that there is no person in the stay detection mode after the end of the second predetermined period, the stay area is canceled and the detection mode is switched from the stay detection mode to the movement detection mode. The detection device according to claim 5. In the second predetermined period, the determination unit has a non-change area in which the amount of change in luminance in the first predetermined period in the detection area is equal to or smaller than a third threshold is greater than or equal to the second threshold. If there is, it is determined that the light change has ended,
The second predetermined period is a period from a time when the determination unit determines that the light change is present to a time when the determination unit determines that the light change is completed. The detection device according to any one of the above. The detection apparatus according to claim 1, wherein a frame rate of the imaging unit is increased in the second predetermined period. An infrared detector that detects the presence or absence of a person in the detection region based on a change in the amount of received infrared light;
A determination unit for confirming the presence / absence of a person in the detection area based on the determination result of the determination unit and the detection result of the infrared detection unit;
The determination unit is
In the second predetermined period, if the infrared detection unit detects that a person is present, the detection result of the infrared detection unit is given priority over the determination result of the determination unit, and the presence of a person in the detection region The detection device according to any one of claims 1 to 8, wherein the determination of the presence or absence of is confirmed. An imaging unit;
A detection unit for detecting presence or absence of a person in a detection region of an analysis image captured by the imaging unit;
Based on the detection result of the detection unit, a determination unit that determines the presence or absence of a person,
A deriving unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than a first threshold in the detection region;
A determination unit that determines that there is a light change if the size of the luminance change region is equal to or greater than a second threshold;
A load to be controlled,
When the determination unit determines that the light change is present, the detection unit stops the detection operation in the second predetermined period, or the determination unit displays the detection result of the detection unit in the second predetermined period. A detection system that maintains a determination result before the start of the second predetermined period without adopting the second predetermined period. Computer
A detection unit that detects the presence or absence of a person in the detection region of the analysis image;
Based on the detection result of the detection unit, a determination unit that determines the presence or absence of a person,
A deriving unit for deriving the size of the luminance change region in which the luminance change amount in the first predetermined period is equal to or greater than a first threshold in the detection region;
A determination unit that determines that there is a light change if the size of the luminance change region is equal to or greater than a second threshold,
When the determination unit determines that the light change is present, the detection unit stops the detection operation in the second predetermined period, or the determination unit displays the detection result of the detection unit in the second predetermined period. A program for functioning as a detection device that maintains a determination result before the start of the second predetermined period without being adopted.

Images