JP4743709B2 - Image sensor device - Google Patents

Description

  The present invention relates to an image sensor device that detects a detection object from a captured image.

  Conventionally, various techniques have been proposed for an image sensor device that detects a detection target from a captured image. For example, in an image sensor device that detects the intrusion of a person based on a captured image, it is impossible to detect a normal person unless a certain level of illuminance is secured. Therefore, an auxiliary illumination means such as an infrared LED is used at night. There has been proposed a technique for lighting up and ensuring illuminance capable of image sensing.

  Now, illumination means, such as infrared LED, may fall in illumination intensity by energization deterioration, and the state which cannot detect a detection target object normally occurs for that reason. If the illuminance at the illumination means is increased, generally, deterioration of energization tends to occur and the life of the illumination means tends to be shortened. Therefore, it is not desirable to set the illuminance of the illumination means higher than necessary when performing image sensing.

  Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide a technique that can extend the life of an illuminating unit while detecting a detection target with respect to an image sensor device.

In order to solve the above-described problem, the invention of claim 1 is an image sensor device that detects a detection target from a captured image, and includes an imaging unit that captures an image and an illumination unit that illuminates an imaging range of the imaging unit. An illuminance adjustment unit that adjusts the illuminance in the illumination unit according to the illuminance adjustment parameter, an image sensing unit that detects the detection object from a captured image in the imaging unit, and a parameter that controls the illuminance adjustment parameter A first setting value and a second setting value at which the illuminance when set to the illuminance adjustment parameter is lower than the first setting value. n setting levels up to (n ≧ 2) level are defined, and in each of the n setting levels excluding the setting level of the first level, the first setting value of the setting level is set to the first setting value. The illuminance when set to the degree adjustment parameter is higher than the illuminance when the first setting value of the setting level, which is one level lower than the illuminance adjustment parameter, is set to the illuminance adjustment parameter. In each of the n setting levels excluding the one setting level, the illuminance when the second setting value of the setting level is set in the illuminance adjustment parameter is lower by one level. The illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is higher, and the parameter control unit sets the first and second setting values included in the same setting level, respectively. When the pair of the detection results when the illuminance is adjusted by setting the illuminance adjustment parameter indicates the detection of the detection object, the same The first or second adjustment value to be set in the illuminance adjustment parameter is selected from the setting level lower than a constant level, and the first set value is used as the illuminance adjustment parameter for the pair of detection results. The detection result when setting and adjusting the illuminance indicates detection of the detection object, and the detection result when adjusting the illuminance by setting the second setting value as the illuminance adjustment parameter is the detection. When indicating that an object is not detected, the first or second set value to be set in the illuminance adjustment parameter is selected from the set level that is higher than the same set level .

The invention of claim 2 is the image sensor device according to claim 1 , wherein each of the n setting levels excluding the setting level of the first level is the second of the setting level. The illuminance when the set value is set in the illuminance adjustment parameter is equal to or less than the illuminance when the first set value of the set level that is one level lower than that is set in the illuminance adjustment parameter. .

According to a third aspect of the present invention, there is provided an image sensor device for detecting a detection target from a captured image, an imaging unit that captures an image, an illumination unit that illuminates an imaging range of the imaging unit, and an illuminance adjustment parameter. An illuminance adjustment unit that adjusts the illuminance in the illumination unit according to the image sensing unit, an image sensing unit that detects the detection object from a captured image in the imaging unit, and a parameter control unit that controls the illuminance adjustment parameter. The first setting value and the second setting value at which the illuminance when set in the illuminance adjustment parameter is lower than the first setting value, respectively, from the first level to the nth (n ≧ 2) level N setting levels are determined, and in each of the n setting levels excluding the setting level of the first level, the first setting value of the setting level is set to the illuminance adjustment parameter. The illuminance at the time of setting becomes higher than the illuminance at the time of setting the first setting value of the setting level lower than that by the illuminance adjustment parameter, and further, the illuminance of the first level In each of the n setting levels excluding the setting level, the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is lower than the setting level by one level. The illuminance becomes higher than the illuminance when the second set value is set as the illuminance adjustment parameter, and the parameter control unit uses the first and second set values included in the same set level as the illuminance adjustment parameter. Among the setting levels at which the detection object can be detected in the image sensing unit when the illuminance is set and adjusted, the lowest level of the setting level can be detected. Identifying a constant level, from the lowest level the set level a level above the set level, selecting the first or the second setting value set in the illumination adjustment parameter.

According to a fourth aspect of the present invention, there is provided an image sensor device for detecting a detection target from a captured image, an imaging unit that captures an image, an illumination unit that illuminates an imaging range of the imaging unit, and an illuminance adjustment parameter. An illuminance adjustment unit that adjusts the illuminance in the illumination unit according to the image sensing unit, an image sensing unit that detects the detection object from a captured image in the imaging unit, and a parameter control unit that controls the illuminance adjustment parameter. The first setting value and the second setting value at which the illuminance when set in the illuminance adjustment parameter is lower than the first setting value, respectively, from the first level to the nth (n ≧ 2) level N setting levels are determined, and in each of the n setting levels excluding the setting level of the first level, the first setting value of the setting level is set to the illuminance adjustment parameter. The illuminance at the time of setting becomes higher than the illuminance at the time of setting the first setting value of the setting level lower than that by the illuminance adjustment parameter, and further, the illuminance of the first level In each of the n setting levels excluding the setting level, the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is lower than the setting level by one level. The illuminance becomes higher than the illuminance when the second set value is set as the illuminance adjustment parameter, and the parameter control unit uses the first and second set values included in the same set level as the illuminance adjustment parameter. Among the setting levels at which the detection object can be detected in the image sensing unit when the illuminance is set and adjusted, the lowest level of the setting level can be detected. Create statistics on a constant level, based on the statistical data, selecting the first or the second setting value set in the illumination adjustment parameter.

The invention of claim 5 is the image sensor device according to any one of claims 1 to 4 , further comprising a life determination unit that determines a life of the illumination unit, and the life determination unit. Determines that the lifetime of the illumination unit is shortened as the value of the illuminance adjustment parameter increases to increase the illuminance.

A sixth aspect of the present invention is the image sensor device according to any one of the first to fifth aspects, wherein the illumination unit includes an infrared LED.

According to the first aspect of the present invention, the pair of detection results when the illuminance is adjusted by setting the first and second set values included in the same setting level as the illuminance adjustment parameter respectively detect the detection object. When shown, the first or second adjustment value set in the illuminance adjustment parameter is selected from a setting level lower than the same setting level. When both of the pair of detection results indicate detection of the detection object, it can be determined that the illuminance at the illumination unit is sufficient, so the first or the illuminance adjustment parameter that is set from the lower level setting level is set. By selecting the second adjustment value, it is possible to reliably detect the detection target without increasing the illuminance at the illumination unit more than necessary .

Further, according to the first aspect of the present invention, regarding the pair of detection results, the detection result when the first setting value is set as the illuminance adjustment parameter and the illuminance is adjusted indicates the detection of the detection object, and the second setting When the detection result when the illuminance is adjusted by setting the value to the illuminance adjustment parameter indicates that the detection target is not detected, the first set to the illuminance adjustment parameter from the setting level higher than the same setting level. 1 or the second set value is selected. The detection result when adjusting the illuminance by setting the first set value as the illuminance adjustment parameter indicates the detection of the detection object, and the detection result when adjusting the illuminance by setting the second set value as the illuminance adjustment parameter. When it indicates that the detection target is not detected, it can be determined that the illumination unit is deteriorated in illuminance. Therefore, the first or second set value to be set in the illuminance adjustment parameter is set from a higher setting level. By selecting, the illuminance of the illumination unit can be increased according to the illuminance deterioration. Therefore, the illuminance at the illumination unit can be appropriately adjusted according to the illuminance deterioration.

According to the invention of claim 2 , the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter in each of the plurality of setting levels excluding the setting level of the first level. Since the illuminance deterioration is equal to or lower than the illuminance when the first setting value having a low setting level of one step level is set as the illuminance adjustment parameter, the illuminance deterioration can be detected with higher accuracy. Therefore, the illuminance at the illumination unit can be adjusted more appropriately according to the illuminance deterioration.

According to the invention of claim 3 , when the illuminance is adjusted by setting the first and second set values included in the same setting level as the illuminance adjustment parameter, the detection object can be detected in the image sensing unit. Among the various setting levels, the lowest setting level is specified, and the first or second setting value to be set in the illuminance adjustment parameter is selected from the setting levels equal to or higher than the lowest setting level. The detection object can be detected without increasing the illuminance more than necessary. Therefore, the lifetime of the illumination unit can be extended while detecting the detection target.

According to the invention of claim 4 , when the illuminance is adjusted by setting the first and second setting values included in the same setting level as the illuminance adjustment parameter, the detection object can be detected in the image sensing unit. Statistical data related to the lowest setting level is created, and the first or second setting value to be set for the illuminance adjustment parameter is selected based on the statistical data. The detection object can be detected without increasing the height. Therefore, the lifetime of the illumination unit can be extended while detecting the detection target. Furthermore, since the lowest setting level may be affected by changes in the imaging environment, the use of statistical data can suppress the effect of changes in the imaging environment on illuminance adjustment. The illuminance at the illumination unit can be adjusted appropriately.

According to the invention of claim 5, the illumination adjustment parameter is controlled so that the detection target can be detected without increasing the illuminance at the illuminating unit more than necessary. Since the lifetime of the part is determined to be short, the replacement time of the illumination part can be properly grasped.

According to the invention of claim 6 , the illumination unit is constituted by an infrared LED. The infrared LED is particularly effective when the infrared LED is used in the illumination unit because the infrared LED is particularly susceptible to deterioration of illuminance.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of an image sensor device 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the image sensor device 100 according to the first embodiment includes an imaging unit 1 that captures an image, an illumination unit 3 that illuminates an imaging range of the imaging unit 1, and an imaging unit 1. An image sensing unit 2 that detects a detection object from the captured image, an illuminance adjustment unit 4 that adjusts the illuminance in the illumination unit 3 according to the illuminance adjustment parameter, a parameter control unit 5 that controls the illuminance adjustment parameter, and an illumination unit 3 is provided. The image sensor device 100 according to the first embodiment is used in, for example, a security system that detects a suspicious person and notifies a security company or the like, and detects an image sensing unit from a captured image obtained by the imaging unit 1. 2 can detect a person.

  The imaging unit 1 includes an imaging element such as a CDD sensor or a CMOS sensor, an A / D converter, and the like, and for example, captures an image by an interlace method. The imaging unit 1 outputs the captured image to the image sensing unit 2 as a digital image signal. The imaging unit 1 is installed outdoors, for example.

  The image sensing unit 2 includes a dedicated hardware circuit that performs image processing, a CPU, and the like, and detects a person from an image captured by the image capturing unit 1. For example, the image sensing unit 2 performs human detection using an inter-frame difference method or the like. The image sensing unit 2 according to the first embodiment performs human detection using a plurality of odd field images or a plurality of even field images captured by the imaging unit 1. The human detection result in the image sensing unit 2 is notified to a security company or the like via a communication network or the like, and is also notified to the parameter control unit 5. Note that the odd-numbered field image and the even-numbered field image may be combined to generate one frame image, and human detection may be performed using a plurality of the frame images.

  The illumination part 3 is comprised by infrared LED, for example, and is used as an auxiliary illumination means at night. Since the imaging unit 1 according to the first embodiment is installed outdoors, at night, the illuminance in the imaging range is insufficient, and the image sensing unit 2 may not be able to perform normal human detection. Therefore, by using the illumination unit 3 composed of infrared LEDs as auxiliary illumination means, sufficient illuminance can be ensured even at night, and normal human detection can be performed by the image sensing unit 2. .

  The illuminance adjustment unit 4 includes a circuit that is configured by a transistor or the like and that drives the illumination unit 3, and adjusts the illuminance at the illumination unit 3 according to the illuminance adjustment parameter. Here, in the infrared LED, the illuminance increases as the current flowing through the infrared LED increases. Therefore, the illuminance can be changed by changing the current. The illuminance adjusting unit 4 according to the first embodiment adjusts the illuminance at the illuminating unit 3 by causing a current corresponding to the illuminance adjusting parameter to flow through the infrared LED constituting the illuminating unit 3. In addition, when driving the infrared LED by applying a plurality of pulse voltages to the infrared LED constituting the illumination unit 3, the pulse of the illumination unit 3 is output by outputting a pulse voltage having a pulse width corresponding to the illuminance adjustment parameter. The illuminance may be adjusted.

  The parameter control unit 5 controls the illuminance adjustment parameter based on the human detection result in the image sensing unit 2. FIG. 2 is a diagram illustrating setting values that can be set in the illuminance adjustment parameter. As shown in FIG. 2, in the first embodiment, n setting levels IE1 to IEn from the first level to the nth (n> 2) level are defined. The setting level IEx (x is a variable and takes a value of 1 ≦ x ≦ n) includes two-stage setting values IExL and IExH. Hereinafter, the setting levels IE1 to IEn are collectively referred to as “setting level IE”, the setting values IE1L to IEnL are collectively referred to as “setting value IEL”, and the setting values IE1H to IEnH are collectively referred to as “setting value IEH”. Call it.

  The parameter control unit 5 selects any one of the setting levels IE1 to IEn, switches the setting values IEL and IEH included in the selected setting level IE, and sets them as the illuminance adjustment parameter. In the first embodiment, the illuminance at the illumination unit 3 increases as the setting level IE used in the parameter control unit 5 increases, that is, from the first level setting level IE1 to the nth level setting level IEn. Get higher. At each setting level IE, the illuminance at the illumination unit 3 is higher when the setting value IEH is set as the illuminance adjustment parameter than when the setting value IEL is set. Therefore, the illuminance at the illumination unit 3 is lowest when the set value IE1L is set in the illuminance adjustment parameter, and is highest when the set value IEnH is set.

  The lifetime determination unit 6 determines the lifetime of the illumination unit 3 based on the illuminance adjustment parameter. This life determination method will be described in detail later.

  Next, an illuminance adjustment method of the image sensor device 100 according to the first embodiment will be described. FIG. 3 is a flowchart showing the illuminance adjustment method according to the first embodiment. As shown in FIG. 3, first, a human detection process is executed in step s1. In step s2, the detection result in step s1 is determined, and one of steps s1, s3, and s5 is executed according to the determination result.

  FIG. 4 is a flowchart showing the human detection process in step s1. As shown in FIG. 4, first in step s101, the parameter control unit 5 sets the setting value IEH of the currently selected setting level IE as an illuminance adjustment parameter. If it does so, the illumination intensity adjustment part 4 will flow the electric current according to the setting value IEH set to the illumination intensity adjustment parameter to infrared LED which comprises the illumination part 3. FIG. In step s102, the imaging unit 1 captures one odd field image.

  Next, in step s103, the parameter control unit 5 next sets the setting value IEL of the currently selected setting level IE as the illuminance adjustment parameter. If it does so, the illumination intensity adjustment part 4 will flow the electric current according to the setting value IEL set to the illumination intensity adjustment parameter to infrared LED which comprises the illumination part 3. FIG. In step s104, the imaging unit 1 captures one even field image. Since the set value IEH and the set value IEL are used in steps s101 and s103, respectively, in step s104, an even field image is captured with an illuminance lower than the illuminance when the odd field image is captured in step s102.

  After that, in step s105, when m (m ≧ 2) sets of odd-numbered field images and even-numbered field images captured in succession are obtained, the image sensing unit 2 obtains m odd-numbered field images in step s106. The person detection is performed using it, and then the person detection is performed using m even field images in step s107.

  In step s1 according to the first embodiment, images are taken at a very short time interval of 1/60 seconds (about 16.7 ms), and step s1 is repeatedly executed at a rate of several times per second. Therefore, it can be considered that the plurality of odd-numbered field images and the plurality of even-numbered field images used for human detection in step s1 are captured almost simultaneously. That is, in step s1, it can be considered that there is almost no difference between the imaging situation when the odd field image is captured and the imaging situation when the even field image is captured. Therefore, when a person is detected from an odd field image captured in a high illuminance situation and a person is detected from an even field image captured in a low illuminance situation, the illumination unit 3 has sufficient illuminance. It can be determined that there is.

  On the other hand, if a person is detected from an odd field image captured in a high illuminance situation and no person is detected from an even field image captured in a low illuminance situation, the illumination unit 3 has experienced illuminance deterioration. Can be determined.

  Further, in step s1, it can be considered that there is almost no difference between the imaging situation when imaging an odd-numbered field image and the imaging situation when imaging an even-numbered field image. When a person is not detected from an odd-numbered field image captured in a high situation, it can be considered that basically no person can be detected from an even-numbered field image captured in a low-illuminance situation. Therefore, a situation where no person is detected in step s106 and a person is detected in step s107 can be determined as a false detection.

  Thereafter, “○○” indicates that a person is detected in both steps s106 and s107, “○ ×” indicates that a person is detected in step s106 and no person is detected in step s107, and both persons are detected in steps s106 and s107. The case where no person is detected is represented by “xx”, the case where no person is detected in step s106, and the case where a person is detected in step s107 is represented by “xx”.

  When the detection result in steps s106 and s107 is “XX” or “XX”, the image sensing unit 2 notifies the security company or the like that a person has been detected via a communication network or the like.

  Referring to FIG. 3, when step s1 is executed, in step s2, parameter control unit 5 determines the human detection result in step s1. If the detection result in step s1 is “XX”, step s3 is executed, if “XX”, step s5 is executed, and if “XX”, step s1 is executed again. .

  In step s3, the parameter control unit 5 determines whether or not the detection result in step s1 including the detection result in the most recent step s1 has become “◯◯” continuously for a predetermined number of times. The parameter control unit 5 determines that the illuminance at the current illumination unit 3 is sufficient if it is “XX” continuously for a predetermined number of times, and is one level lower than the current setting level IE. A new IE is selected. Then, step s1 is executed again. In this step s1, human detection is performed using the set values IEL and IEH included in the newly selected set level IE. FIG. 5 is a diagram showing how steps s1 to s4 are executed. As shown in FIG. 5, when the detection result in step s1 becomes “◯◯” continuously several times, the setting level IE decreases by one step, and thereafter, the setting value IEL of the setting level IE after the level down IEH is used to detect people.

  On the other hand, if it is determined in step s3 that the predetermined number of times has not been “◯◯”, the parameter control unit 5 does not change the setting level IE to be used, and then step s1 is executed again. The

  In step s5, the parameter control unit 5 determines whether or not the detection result in step s1 including the detection result in the latest step s1 is “Ox” continuously for a predetermined number of times. The parameter control unit 5 determines that the illuminance deterioration has occurred in the illumination unit 3 and the illuminance is insufficient if “Ox” continues for a predetermined number of times, and the currently selected setting level IE A new setting level IE that is one level higher than that is selected. Then, step s1 is executed again. In this step s1, human detection is performed using the set values IEL and IEH included in the newly selected set level IE. FIG. 6 is a diagram showing how steps s1, s2, s5, and s6 are executed. As shown in FIG. 6, when the detection result at step s1 changes from “XX” to “XX”, and then becomes “XX” continuously several times, the setting level IE to be used increases by one step. Thereafter, human detection is performed by using the set values IEL and IEH of the set level IE after the level up.

  On the other hand, if it is determined in step s5 that the predetermined number of times is not “Ox” continuously, the parameter control unit 5 does not change the setting level IE to be used, and then step s1 is executed again. .

  In step s2, when the parameter control unit 5 determines that the detection result in step s1 is “xx”, the parameter control unit 5 determines that there is no person in the imaging range of the imaging unit 1, and step s1 is executed again. The In step s2, if the parameter control unit 5 determines that the detection result in step s1 is “× ◯”, it is determined that a person has been erroneously detected in the image sensing unit 2, and step s1 is executed again.

  Moreover, since the illumination part 3 which concerns on this Embodiment 1 is used as an auxiliary illumination means at night, the said illumination part 3 is not necessarily always lighting. Therefore, the process of above-mentioned step s1-s6 is performed when the illumination intensity of an imaging environment falls and the illumination part 3 is made to light. In the image sensor device 1, an illuminance sensor (not shown) that detects the illuminance of the imaging environment is provided, and the illuminance detection result by the illuminance sensor is notified to the parameter control unit 5. The parameter control unit 5 controls the illuminance adjustment parameter based on the illuminance detection result received from the illuminance sensor. When the illuminance of the imaging environment is sufficiently high, the illumination unit 3 is not lit, and when the illuminance decreases The illumination unit 3 is turned on.

  The lifetime determination unit 6 determines that the lifetime of the illumination unit 3 is shorter as the value of the illuminance adjustment parameter becomes a value that increases the illuminance at the illumination unit 3. For example, when the setting value IE1 having the lowest level or the setting values IE2 and IEH of the setting level IE2 that is one level higher than the setting level IE1 is set in the illuminance adjustment parameter, the illumination unit 3 is almost completely deteriorated in illuminance. It is determined that it is not, and it is determined that the life of the illumination unit 3 will be exhausted. On the other hand, if the illuminance adjustment parameter is set to the setting level IEn having the highest level or the setting values IEL and IEH of the setting level IE (n−1) one level lower than the setting level IEn, It is determined that the degree of illuminance deterioration that has occurred is very large, and it is determined that the life of the illumination unit 3 has expired.

  As described above, the illuminance adjustment parameter is controlled in a direction in which the illuminance of the illuminating unit 3 decreases when the illuminance at the illuminating unit 3 is sufficient, and when the illuminance deterioration occurs in the illuminating unit 3 Since the illuminance of the illuminating unit 3 is controlled in the direction of increasing, it can be determined that the degree of illuminance deterioration in the illuminating unit 3 increases as the illuminance adjustment parameter value increases the illuminance in the illuminating unit 3. it can. Therefore, the replacement time of the illumination unit 3 can be appropriately grasped by determining the lifetime of the illumination unit 3 to be shorter as the value of the illuminance adjustment parameter becomes a value that increases the illuminance at the illumination unit 3.

  In the life determination unit 6 according to the first embodiment, the maximum set level IEn or the set level IE (n−1) one level lower than that is used in step s1 continuously several times. If it occurs, it is determined that it is time to replace the illumination unit 3, and that effect is displayed on a display unit (not shown) provided in the image sensor device 100. Thereby, it is possible to notify the user of an appropriate replacement time of the illumination unit 3.

  As described above, in the image sensor device 100 according to the first embodiment, when the image sensing unit 2 detection target is detected, the illuminance adjustment parameter is set in the direction in which the illuminance at the illumination unit 3 decreases. The detection object can be detected without increasing the illuminance of 3 more than necessary by the illumination unit. Therefore, the lifetime of the illumination unit can be extended while detecting the detection target. In particular, since the infrared LED easily deteriorates in illuminance, it is very effective when the infrared LED is used for the illumination unit 3 as in the first embodiment.

  In the first embodiment, the detection results in steps s106 and s107, that is, the setting values IEL and IEH included in the same setting level IE are set as the illuminance adjustment parameters, respectively, and the illuminance of the illumination unit 3 is adjusted. When the pair of detection results at the image sensing unit 2 at the time indicate detection of the detection object, the adjustment value IEL to be set as the illuminance adjustment parameter from the setting level IE lower than the same setting level IE, IEH is selected. When the detection results in steps s106 and s107 both indicate detection of the detection target, it can be determined that the illuminance at the illumination unit 3 is sufficient, so the illuminance adjustment parameter is set from a lower level setting level IE. By selecting the adjustment values IEL and IEH to be set to, the detection target can be reliably detected without increasing the illuminance at the illumination unit 3 more than necessary.

  Further, regarding the detection results in steps s106 and s107, the detection result in step s106, that is, the detection result when the set value IEH is set as the illuminance adjustment parameter and the illuminance is adjusted indicates the detection of the detection object. When the detection result when the detection result when adjusting the illuminance by setting the set value IEL as the illuminance adjustment parameter indicates that the detection target is not detected, the illuminance adjustment parameter is set from the higher setting level IE. The set values IEL and IEH to be selected are selected. When the detection result in step s106 indicates detection of the detection target and the detection result in step s107 indicates that the detection target is not detected, it can be determined that the illumination unit 3 has deteriorated illuminance. By selecting the setting values IEL and IEH to be set in the illuminance adjustment parameter from the higher setting level IE, the illuminance of the illuminating unit 3 can be increased according to the illuminance deterioration. Therefore, it is possible to appropriately adjust the illuminance at the illumination unit 3 according to the illuminance deterioration.

  Moreover, in this Embodiment 1, the value of the illuminance adjustment parameter controlled so that the image sensing unit 2 can detect the detection target without increasing the illuminance at the illumination unit 3 more than necessary is the illumination unit 3. Since the lifetime of the illuminating unit 3 is determined to be shorter as the illuminance increases, the replacement time of the illuminating unit 3 can be appropriately grasped.

  In the first embodiment, among the plurality of setting levels IE1 to IEn, the adjacent setting levels IE do not overlap at all, but may partially overlap. FIG. 7 is a diagram showing the setting range of the illuminance adjustment parameter in this case. As shown in FIG. 7, in each of the setting levels IE2 to IEn, the illuminance when the setting value IEL is set as the illuminance adjustment parameter is the setting value IEL of the setting level IE that is one level lower than that. It is higher than the illuminance when the illuminance adjustment parameter is set. Further, in each of the setting levels IE2 to IEn, the illuminance when the setting value IEH is set as the illuminance adjustment parameter is set to the illuminance adjustment parameter at the setting level IE whose setting level IE is lower by one level. It is higher than the illuminance. In each of the setting levels IE2 to IEn, the illuminance when the setting value IEL is set as the illuminance adjustment parameter is set to the illuminance adjustment parameter at the setting level IE which is lower than the setting level IE. It is lower than the illuminance.

  As described above, the setting value IExH of the setting level IEx having the lower level is the setting value IE of the setting level IE (x + 1) having the higher level among the setting levels IEx and IE (x + 1) of the two levels adjacent to each other. By setting the illuminance at the illumination unit 3 to be higher when it is used than (x + 1) L, it is possible to detect the illuminance deterioration at the illumination unit 3 with higher accuracy. This effect will be described below with reference to FIGS.

  As shown in FIG. 8, when the setting levels IEx, IE (x + 1) adjacent to each other do not overlap, illuminance deterioration occurs in the illumination unit 3, thereby detecting a person in the image sensing unit 2. When the minimum illuminance DIE that can be performed is slightly lower than the illuminance when the setting value IE2H of the setting level IE2 is used, for example, at step s1 when the setting values IE3L and IE3H of the setting level IE3 are used The detection result is “XX” even when there is a person in the imaging range of the imaging unit 1, and the parameter control unit 5 erroneously determines that there is no person, and the illumination unit 3 is deteriorated in illuminance. Cannot be detected.

  On the other hand, as shown in FIG. 9, when the setting levels IEx and IE (x + 1) adjacent to each other partially overlap, the setting values IE3L and IE3H of the setting level IE3 are used. The detection result in step s1 is “◯ ×”, and the parameter control unit 5 can detect the illuminance deterioration in the illumination unit 3.

  In two adjacent setting levels IE, the illuminance when the setting value IEH at the lower setting level IE is used is the illuminance when the setting value IEL at the higher setting level IE is used. Even if the set value IEH and the set value IEL are set to be the same, the same effect can be obtained.

  Thus, in each of the setting levels IE2 to IEn, the illuminance when the setting value IEL of the setting level is set as the illuminance adjustment parameter is the illuminance adjustment of the setting value IEH of the setting level IE that is one level lower than that. Since it is below the illuminance at the time of setting as a parameter, it is possible to detect illuminance deterioration with higher accuracy. Therefore, the illuminance at the illumination unit 3 can be adjusted more appropriately according to the illuminance deterioration.

Embodiment 2. FIG.
FIG. 10 is a flowchart showing the illuminance adjustment method of the image sensor device 100 according to Embodiment 2 of the present invention. The configuration of the image sensor device 100 according to the second embodiment is the same as the configuration shown in FIG. 1, and the above-described image sensor device 100 according to the first embodiment is an illuminance adjustment method and illumination for the illumination unit 3. The method for determining the replacement time of part 3 is different. In the illuminance adjustment method according to the second embodiment, the image sensing unit 2 obtains the lowest setting level IE that can be detected by a person, and sets the optimum setting level IE according to the lowest setting level IE. decide.

  As shown in FIG. 10, first, in step s11, the human detection process shown in FIG. 4 is executed. In step s12, the parameter control unit 5 determines whether the human detection process in step s11 has been executed a predetermined number of times. If the parameter control unit 5 determines that step s11 has been executed a predetermined number of times, the parameter control unit 5 determines the human detection result in the most recent step s11 in step s13. If the detection result in step s11 is “◯◯”, step s14 is executed, otherwise, in step s26, a counter that counts the number of times the person detection processing in step s11 is executed is reset, Thereafter, step s11 is executed again. The counter is included in the parameter control unit 5 and is reset by the parameter control unit 5. On the other hand, when the parameter control unit 5 determines in step s12 that step s11 has not been executed a predetermined number of times, step s11 is executed again.

  In step s14, the parameter control unit 5 selects the maximum setting level IEn among the plurality of setting levels IE1 to IEn. In step s15, the person detection process shown in FIG. 4 is executed. In step s15, the setting values IEnL and IEnH of the setting level IEn selected in step s14 are used.

  Next, in step s16, the parameter control unit 5 determines the human detection result in step s15. If the detection result at step s15 is “XX”, step s17 is executed, if “XX”, step s18 is executed, and if “XX”, step s20 is executed. In the case of “× ○”, the above-described step s26 is executed, and then step s11 is executed again.

  In step s17, the parameter control unit 5 newly selects a setting level IE that is one step lower than the current setting level IE. Then, step s15 is executed again, and in step s15, the person detection is performed using the set values IEL and IEH included in the newly selected setting level IE.

  In step s18, the parameter control unit 5 sets the setting level IE, which is one level higher than the currently selected setting level IE, to the lowest setting level IE that can be detected by the person in the image sensing unit 2 (hereinafter, “detection”). This is stored as “minimum setting level IEMIN”. In step s19, the optimum setting level IE (hereinafter referred to as “optimum setting level IEAV”) is determined in accordance with the lowest detection setting level IEMIN acquired in step s18. In the first embodiment, the setting level IE that is one step higher than the lowest detection setting level IEMIN is set as the optimum setting level IEAV. Then, the parameter control unit 5 selects the optimum setting level IEAV as the setting level IE to be used in the subsequent human detection process, and then step s26 is executed and step s11 is executed again. Note that the setting level IE that is the same level as the lowest detection setting level IEMIN may be set as the optimum setting level IEAV, or the setting level IE that is two stages higher than the lowest detection setting level IEMIN may be set as the optimum setting level IEAV.

  FIG. 11 is a diagram showing how steps s15 to s17 are repeatedly executed, and thereafter steps s18 and s19 are executed. When the human detection process of step s11 is executed a predetermined number of times, and it is determined in step s13 that the detection result in the latest step s11 is “XX”, the maximum level is set as shown in FIG. Level IEn is used for the human detection process. Thereafter, the setting level IE to be used is lowered by one step, and when the detection result in step s15 becomes “Ox”, the setting level IE that is one step higher than the setting level IE selected at that time is detected. It is stored as the lowest setting level IEMIN. That is, in this case, the setting level IE of the lowest level among the setting levels IE in which the human detection results when the illuminance is adjusted using the setting values IEL and IEH indicates the detection state (“◯◯”) is It is stored as the lowest detection setting level IEMIN. Thereafter, a setting level IE that is one step higher than the lowest detection setting level IEMIN is newly selected as the optimum setting level IEAV, and thereafter, the setting values IEL and IEH of the newly selected setting level IE are used and step s11. The human detection process is executed.

  In step s18, if the currently selected setting level IE is the maximum setting level IEn and there is no setting level IE that is one step higher than the current setting level IE, the maximum level is set. The setting level IEn is stored as the lowest detection setting level IEMIN. In step s19, when there is no setting level IE that is one step higher than the lowest detection setting level IEMIN, the setting level IEn is determined as the optimum setting level IEAV.

  If it is determined in step s16 that the detection result in step s15 is “xx”, in step s20, the parameter control unit 5 newly selects a setting level IE that is one step higher than the current setting level IE. . In step s21, the human detection process shown in FIG. 4 is executed. Note that if the setting level IE selected immediately before the execution of step s20 is the setting level IEn, the setting level IE cannot be increased in step s20, so steps s21 to s25 described later are performed. Is skipped and step s26 is executed, and then step s11 is executed.

  Next, in step s22, the parameter control unit 5 determines the human detection result in step s21. If the detection result in step s21 is “◯◯”, step s23 is executed, otherwise step s25 is executed.

  In step s23, the parameter control unit 5 stores the currently selected setting level IE as the lowest detection setting level IEMIN. In step s24, the parameter control unit 5 sets the optimum setting level IEAV in accordance with the lowest detection setting level IEMIN acquired in step s23. decide. In step s24, as in step s19, for example, the setting level IE that is one level higher than the lowest detection setting level IEMIN is set as the optimum setting level IEAV. Then, the parameter control unit 5 selects the optimum setting level IEAV as the setting level IE to be used in the subsequent human detection process, and then step s26 is executed and step s11 is executed again. In step s24, when there is no setting level IE that is one step higher than the lowest detection setting level IEMIN, the setting level IEn is determined as the optimum setting level IEAV.

  On the other hand, if it is determined in step s22 that the detection result in step s21 is any one of “XX”, “Ox”, and “XO”, in step s25, the parameter control unit 5 The setting level IE to be returned is returned to the level immediately before the execution of step s20, that is, is lowered by one step, and thereafter, step s26 is executed and step s11 is executed again.

  FIG. 12 is a diagram illustrating a state in which steps s15 to s17 are repeatedly executed, and thereafter steps s20 to s24 are executed. When the human detection process of step s11 is executed a predetermined number of times, and it is determined in step s13 that the detection result in step s11 is “◯◯”, the maximum set level IEn as shown in FIG. Is used in the human detection process. Thereafter, the setting level IE to be used is lowered one step at a time, and when the detection result in step s15 becomes “XX”, the setting level IE to be used is increased by one step. In step s22, when the detection result in step s21 is “◯◯”, the currently selected setting level IE is stored as the lowest detection setting level IEMIN. Thereafter, a setting level IE that is one step higher than the lowest detection setting level IEMIN is newly selected as the optimum setting level IEAV, and thereafter, the setting values IEL and IEH of the newly selected setting level IE are used and stepped. The human detection process of s11 is executed.

  FIG. 13 is a diagram showing how steps s15 to s17 are repeatedly executed, and thereafter steps s20 to s22 and s25 are executed. As shown in FIG. 13, when the maximum setting level IEn is selected in step s14, thereafter, the setting level IE to be used is lowered step by step, and the detection result in step s15 is “xxx”. ", The setting level IE to be used is increased by one level. When the detection result at step s21 is “XX” at step s22, the setting level IE to be used is returned to the level before the level is increased by one step at step s20, and then the human detection at step s11 is performed. Processing is executed.

  In the second embodiment, the human detection process in steps s11, s15, and s21 is always executed at a rate of several times per second regardless of the order. For example, when steps s11 to s15 are executed continuously, the time interval from the start of execution of step s11 to the start of execution of step s15 is set to 200 ms or less, and step s15 executed repeatedly a plurality of times. The execution time interval is also set to 200 ms or less.

  Here, when the detection result in step s15 is “xx”, it can be basically determined that no person is present in the imaging range of the imaging unit 1. Therefore, in this case, even when a setting level IE that is equal to or lower than the setting level IE at which the detection result is “XX” is used, if there is a person in the imaging range, the image sensing unit 2 May be able to detect people. Therefore, the lowest detection setting level IEMIN cannot be specified only by the detection result in step s15.

  However, as described with reference to FIG. 8 described above, the place where “Ox” is originally “x” may become “xx” depending on the value of the minimum illuminance DIE, and the detection error in the image sensing unit 2 is also possible. Therefore, even if the detection result in step s15 is “XX”, the setting level IE that is one level higher than the setting level IE that has the detection result “XX” is the minimum detection setting. It may be level IEMIN.

  Therefore, as described above, when the detection result in step s15 is “xx”, a setting level IE that is one step higher than the current setting level IE is newly selected, and the setting level IE is used. Perform human detection processing. If the person detection result is “XX” even when the setting level IE of one level is used, the person picks up the image of the image pickup unit 1 while steps s15 to s17 are repeatedly executed. It is determined that it has moved out of the range, and the setting level IE to be used is returned to the level immediately before the execution of step s20.

  On the other hand, when the setting level IE of one step is used and “XX” is obtained, it is determined that there is still a person in the imaging range, and the setting level IE of the one step is detected at the lowest level. The optimum setting level IEAV is determined according to the stored minimum detection setting level IEMIN.

  When step s21 is executed, as shown in FIGS. 12 and 13, the step executed one time before the most recent step s15 (the detection result is “XX”). In s15, the setting level IE of the same level as in step s21 is used to detect a person, and the result is “XX”, and the execution interval of the person detection process is as short as 200 ms. Since it is set, it can be considered that the detection result in step s21 does not become “Ox”. Therefore, if the detection result in step s21 is determined to be “◯ ×” in step s22, it is treated as a false detection in the same manner as “× ◯”, and step s25 is executed to restore the setting level IE. ing.

  Moreover, since the illumination part 3 is used as an auxiliary illumination means at night like the above-mentioned Embodiment 1, the process of the above-mentioned steps s11-s26 turns on the illumination part 3 because the illumination intensity of an imaging environment falls. It is executed when making it.

  In addition, the lifetime determination unit 6 according to the second embodiment is configured to detect and set the minimum setting level IEn and the setting level IE (n−1) one level lower than the maximum setting level IEn continuously multiple times. When the parameter control unit 5 stores the level IEMIN, it is determined that it is time to replace the illumination unit 3, and that effect is displayed on a display unit (not shown) provided in the image sensor device 100.

  As described above, in the image sensor device 100 according to the second embodiment, when the setting values IEL and IEH included in the same setting level IE are set as the illuminance adjustment parameters and the illuminance is adjusted, the image sensing unit 2 is used. The setting level IE having the lowest level among the setting levels IE that can be detected by the detection object is identified and set as the lowest detection setting level IEMIN. Then, setting values IEL and IEH set in the illuminance adjustment parameter are selected from the setting level IE that is equal to or higher than the minimum detection setting level IEMIN. Therefore, the detection object can be detected without increasing the illuminance of the illumination unit 3 more than necessary. Therefore, the lifetime of the illumination unit 3 can be extended while detecting the detection target.

Embodiment 3 FIG.
FIG. 14 is a flowchart showing the illuminance adjustment method of the image sensor device 100 according to Embodiment 3 of the present invention. The configuration of the image sensor device 100 according to the third embodiment is the same as the configuration shown in FIG. 1, and is different from the image sensor device 100 according to the second embodiment described above in the method for determining the optimum setting level IEAV. In the second embodiment described above, the setting level IE that is equal to or higher than the acquired lowest detection setting level IEMIN is set as the optimum setting level IEAV. However, in the third embodiment, the statistics of the lowest detection setting level IEMIN are calculated. Data is created, and an optimal setting level IEAV is determined based on the statistical data.

  As shown in FIG. 14, first, in step s31, the person detection process shown in FIG. 4 is executed. In step s32, the parameter control unit 5 determines the human detection result in step s31. If the detection result in step s31 is “◯◯”, step s33 is executed, and otherwise, step s31 is executed again.

  In step s33, a detection minimum setting level acquisition process is executed. FIG. 15 is a flowchart showing a minimum detection setting level acquisition process. As shown in FIG. 15, first, in step s41, the parameter control unit 5 selects the maximum setting level IEn from the plurality of setting levels IE1 to IEn, as in step s14 described above. In step s42, the person detection process shown in FIG. 4 is executed. In step s42, the setting values IEnL and IEnH of the setting level IEn selected in step s41 are used.

  Next, in step s43, the parameter control unit 5 determines the human detection result in step s42. If the detection result in step s42 is “XX”, step s44 is executed, if “XX”, step s45 is executed, and if “XX”, step s46 is executed. In the case of “X”, the detection minimum setting level acquisition process ends.

  In step s44, the parameter control unit 5 newly selects a setting level IE that is one step lower than the current setting level IE. Then, step s42 is executed again, and in step s42, person detection is performed using the set values IEL and IEH included in the newly selected setting level IE.

  In step s45, the parameter control unit 5 stores the setting level IE that is one step higher than the currently selected setting level IE as the minimum detection setting level IEMIN, as in step s18 described above, and obtains the minimum detection setting level. The process ends.

  If it is determined in step s43 that the detection result in step s42 is “xx”, in step s46, the parameter control unit 5 newly selects a setting level IE that is one step higher than the current setting level IE. . In step s47, the person detection process shown in FIG. 4 is executed. In this case, when the setting level IE selected immediately before the execution of step s46 is the maximum setting level IEn, the setting level IE cannot be increased in step s46. In this case, the minimum detection level acquisition process ends.

  Next, in step s48, the parameter control unit 5 determines the human detection result in step s47. If the detection result at step s47 is “◯◯”, step s49 is executed, otherwise step s50 is executed.

  In step s49, as in step s23 described above, the parameter control unit 5 stores the currently selected setting level IE as the lowest detection setting level IEMIN, and the lowest detection setting level acquisition process ends.

  On the other hand, if it is determined in step s47 that the detection result in step s48 is any one of “xxx”, “◯◯”, and “× ◯”, the parameter control unit 5 uses it in step s50. The setting level IE is returned to the level immediately before the execution of step s46, and the detection minimum setting level acquisition process ends.

  As will be apparent from the description below, the minimum detection setting level IEMIN may be stored a plurality of times. Each time the steps s45 and s49 are executed, the parameter control unit 5 stores the setting level IE stored as the lowest detection setting level IEMIN and the number of storages in association with each other. Thereby, the statistical data of the minimum detection setting level IEMIN is created. FIG. 16 is a diagram showing an example of the statistical data. As shown in FIG. 16, the parameter control unit 5 stores the level of the setting level IE stored as the lowest detection setting level IEMIN and the number of storages thereof in association with each other. In the example of FIG. 16, the number of times that the setting level IE10 is stored as the lowest detection setting level IEMIN is the largest.

  Referring to FIG. 14, when step s33 is executed, in step s34, parameter control unit 5 determines whether or not a predetermined time has elapsed. In step s34, for example, it is determined whether one month has passed. If it is determined in step s34 that the predetermined time has not elapsed, step s31 is executed again. On the other hand, if it is determined in step s34 that the predetermined time has elapsed, in step s35, the parameter control unit 5 determines the optimum setting level IEAV based on the created statistical data of the lowest detection setting level IEMIN.

  Here, in the third embodiment, as in the second embodiment described above, the human detection process in steps s31, s42, and s47 is always performed in 200 ms regardless of the order. Run at intervals. For example, when steps s31 to s33 are executed continuously, the time interval from the start of execution of step s31 to the start of execution of step s42 is set to 200 ms, and the execution time of step s42 executed repeatedly a plurality of times The interval is also set to 200 ms. Therefore, if it is determined in step s34 that one month has passed, step s33 may already be executed a plurality of times, and the parameter control unit 5 also stores the minimum detection setting level IEMIN a plurality of times. May have. Therefore, if it is determined in step s34 that the predetermined time has elapsed, the statistical data as shown in FIG. 16 is already created.

  In step s35, for example, the parameter control unit 5 calculates the average level AVGL of the setting level IE stored as the lowest detection setting level IEMIN from the created statistical data, and changes the setting level IE1 to IEn to the average level AVGL. The nearest setting level IE is specified. Then, a setting level IE of a level obtained by adding a predetermined margin level to the specified setting level IE is determined as the optimum setting level IEAV. The average level AVGL can be obtained by the following equation.

  However, C1 to Cn in the above formulas indicate the number of times the set levels IE1 to IEn are stored. In the example shown in FIG. 16, AVGL = 10.6.

  The margin level is information input to the image sensor device 100 when the user operates an operation unit (not shown) provided in the image sensor device 100 and can be freely changed by the user. it can. For example, when the statistical data shown in FIG. 16 is obtained and the margin level is set to “+1” by the user, the parameter control unit 5 determines the setting level IE12 as the optimum setting level IEAV.

  The parameter control unit 5 selects the determined optimum setting level IEAV as the setting level IE to be used in the subsequent human detection process, and then step s36 is executed. In step s36, the parameter control unit 5 resets the counter that counts the predetermined time in step s34 and the counter that counts the number of times the minimum detection setting level IEMIN is stored. These counters are provided in the parameter control unit 5. When step s36 is executed, step s31 is executed again, and thereafter the same processing is repeatedly executed.

  Since the illumination unit 3 is used as auxiliary illumination means at night as in the first and second embodiments, the processing in steps s31 to s36 described above reduces the illuminance of the imaging environment, and the illumination unit 3 It is executed when lit.

  As described above, in the image sensor device 100 according to the third embodiment, statistical data related to the lowest detection setting level IEMIN is created, and the setting values IEL and IEH to be set in the illuminance adjustment parameter are selected based on the statistical data. Therefore, the detection target can be detected without increasing the illuminance of the illumination unit 3 more than necessary. Therefore, the lifetime of the illumination unit can be extended while detecting the detection target.

  Furthermore, since the minimum detection setting level IEMIN may be affected by changes in the imaging environment, by using the statistical data, the influence of the change in the imaging environment on the illuminance adjustment can be suppressed. The illuminance at the unit 3 can be adjusted appropriately. For example, since the minimum detection setting level IEMIN may change between clear and cloudy at night, the minimum detection setting level IEMIN acquired when it is sunny is also used when it is cloudy. Then, the illuminance of the illumination unit 3 may not be adjusted appropriately. As in the third embodiment, by determining the adjustment values IEL and IEH to be set in the illuminance adjustment parameter based on the statistical data of the minimum detection setting level IEMIN, both when it is sunny and when it is cloudy In this case, it is possible to adjust the illuminance to some extent.

It is a block diagram which shows the structure of the image sensor apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the setting value which can be set to an illumination intensity adjustment parameter. It is a flowchart which shows the illuminance adjustment method of the image sensor apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the person detection process of the image sensor apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the illuminance adjustment method of the image sensor apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the illuminance adjustment method of the image sensor apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the other example of the setting value which can be set to an illumination intensity adjustment parameter. It is a figure which shows the correspondence of the setting value which can be set to an illumination intensity adjustment parameter, and the detection result of a detection target object. It is a figure which shows the correspondence of the other example of the setting value which can be set to an illumination intensity adjustment parameter, and the detection result of a detection target object. It is a flowchart which shows the illuminance adjustment method of the image sensor apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the illumination intensity adjustment method of the image sensor apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the illumination intensity adjustment method of the image sensor apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the illumination intensity adjustment method of the image sensor apparatus which concerns on Embodiment 2 of this invention. It is a flowchart which shows the illuminance adjustment method of the image sensor apparatus which concerns on Embodiment 3 of this invention. It is a flowchart which shows the detection minimum setting level acquisition process of the image sensor apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the statistical data of a detection minimum setting level.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Imaging part 2 Image sensing part 3 Illumination part 4 Illuminance adjustment part 5 Parameter control part 6 Life determination part 100 Image sensor apparatus

Claims (6)

An image sensor device that detects a detection object from a captured image,
An imaging unit that captures an image;
An illumination unit that illuminates an imaging range of the imaging unit;
An illuminance adjustment unit that adjusts the illuminance at the illumination unit according to the illuminance adjustment parameter;
An image sensing unit for detecting the detection object from an image captured by the imaging unit;
A parameter control unit for controlling the illuminance adjustment parameter,
From the first level to the nth (n ≧ 2) level, each including a first set value and a second set value at which the illuminance when set to the illuminance adjustment parameter is lower than the first set value N setting levels are defined,
In each of the n setting levels excluding the setting level of the first level, the illuminance when the first setting value of the setting level is set in the illuminance adjustment parameter is one level higher than that. Becomes higher than the illuminance when the first setting value of the low setting level is set as the illuminance adjustment parameter,
Further, in each of the n setting levels excluding the setting level of the first level, the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is 1 more than that. It becomes higher than the illuminance when the second setting value of the setting level having a low step level is set in the illuminance adjustment parameter,
The parameter control unit
When the pair of the detection results when the illuminance is adjusted by setting the first and second setting values included in the same setting level as the illuminance adjustment parameter respectively indicate detection of the detection object, From the setting level that is lower than the same setting level, select the first or second adjustment value to be set in the illuminance adjustment parameter,
Regarding the pair of detection results, the detection result when the first set value is set as the illuminance adjustment parameter and the illuminance is adjusted indicates detection of the detection object, and the second set value is set as the illuminance. When the detection result when the illuminance is adjusted by setting the adjustment parameter indicates that the detection target is not detected, the illuminance adjustment parameter is set from the set level higher than the same set level. An image sensor device that selects the first or second set value . The image sensor device according to claim 1,
In each of the n setting levels excluding the setting level of the first level, the illuminance when the second setting value of the setting level is set in the illuminance adjustment parameter is one level higher than that. lower said that the first setting value of the setting level has become the illuminance following when set to the illumination adjustment parameter, the image sensor device. An image sensor device that detects a detection object from a captured image,
An imaging unit that captures an image;
An illumination unit that illuminates an imaging range of the imaging unit;
An illuminance adjustment unit that adjusts the illuminance at the illumination unit according to the illuminance adjustment parameter;
An image sensing unit for detecting the detection object from an image captured by the imaging unit;
A parameter control unit for controlling the illuminance adjustment parameter;
With
From the first level to the nth (n ≧ 2) level, each including a first set value and a second set value at which the illuminance when set to the illuminance adjustment parameter is lower than the first set value N setting levels are defined,
In each of the n setting levels excluding the setting level of the first level, the illuminance when the first setting value of the setting level is set in the illuminance adjustment parameter is one level higher than that. Becomes higher than the illuminance when the first setting value of the low setting level is set as the illuminance adjustment parameter,
Further, in each of the n setting levels excluding the setting level of the first level, the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is 1 more than that. It becomes higher than the illuminance when the second setting value of the setting level having a low step level is set in the illuminance adjustment parameter,
The parameter control unit
When the first and second setting values included in the same setting level are set as the illuminance adjustment parameter and the illuminance is adjusted, both of the setting levels at which the detection target can be detected by the image sensing unit of identifies the lowest level the set level, from the lowest level the set level a level above the set level, you select the first or the second setting value set in the illumination adjustment parameter, Image sensor device. An image sensor device that detects a detection object from a captured image,
An imaging unit that captures an image;
An illumination unit that illuminates an imaging range of the imaging unit;
An illuminance adjustment unit that adjusts the illuminance at the illumination unit according to the illuminance adjustment parameter;
An image sensing unit for detecting the detection object from an image captured by the imaging unit;
A parameter control unit for controlling the illuminance adjustment parameter,
From the first level to the nth (n ≧ 2) level, each including a first set value and a second set value at which the illuminance when set to the illuminance adjustment parameter is lower than the first set value N setting levels are defined,
In each of the n setting levels excluding the setting level of the first level, the illuminance when the first setting value of the setting level is set in the illuminance adjustment parameter is one level higher than that. Becomes higher than the illuminance when the first setting value of the low setting level is set as the illuminance adjustment parameter,
Further, in each of the n setting levels excluding the setting level of the first level, the illuminance when the second setting value of the setting level is set as the illuminance adjustment parameter is 1 more than that. It becomes higher than the illuminance when the second setting value of the setting level having a low step level is set in the illuminance adjustment parameter,
The parameter control unit
When the first and second setting values included in the same setting level are set as the illuminance adjustment parameter and the illuminance is adjusted, both of the setting levels at which the detection target can be detected by the image sensing unit Of these, an image sensor device that creates statistical data relating to the lowest setting level and selects the first or second setting value to be set in the illuminance adjustment parameter based on the statistical data . An image sensor device according to any one of claims 1 to 4 ,
A life determination unit for determining the life of the illumination unit;
The life determination unit, as the value of the illuminance adjustment parameter is a value of increasing the illuminance, determining shorten the life of the illumination unit, the image sensor device. An image sensor device according to any one of claims 1 to 5,
The illumination unit that contains the infrared LED, an image sensor device.

Images