JP2012042229A - Detection device, detection method, and electronic apparatus - Google Patents

Abstract

Even when a plurality of light sources are used, light of λ1 and light of λ2 are uniformly distributed with the same illuminance.
A first light source controller 51 controls the irradiation timing and illuminance of a first light source group 52 by supplying driving power to the first light source group 52 and adjusting the current value. The second light source control unit 53 controls the irradiation timing and illuminance of the second light source group 54 by supplying driving power to the second light source group 54 and adjusting the current value. Thus, by individually controlling each light source group, the irradiation range of the first light source group 52, the irradiation range of the second light source group 54, the irradiation range of the first light source group 52, and the second light source group 54 The illuminance of the light with the wavelength λ1 and the illuminance of the light with the wavelength λ2 in the overlapping region with the irradiation range can be uniformly distributed. The present invention can be applied to a skin detection apparatus.
[Selection] Figure 4

Description

  The present invention relates to a detection device, a detection method, and an electronic device, and in particular, a detection device suitable for performing skin detection on an image obtained by capturing a user and controlling the electronic device based on the detection result, The present invention relates to a detection method and an electronic device.

  There is a skin detection technique for detecting an area where skin is exposed (hereinafter referred to as a skin area) such as a face or a hand from an image obtained by imaging a person (see, for example, Patent Document 1). .

  In this skin detection technology, a first image obtained by imaging a subject (person) illuminated by a light emitting unit such as an LED (light emitting diode) that outputs light having a wavelength λ1 in the near infrared region, and a wavelength λ1 Obtains a second image obtained by capturing an image of a subject illuminated by a light emitting unit composed of an LED or the like that outputs light having a wavelength λ2 in a different near infrared region. Then, the skin area is detected based on the difference in luminance between the first image and the second image.

  The near-infrared wavelengths λ1 and λ2 are determined using the reflection characteristics of human skin. That is, it is known that the reflectance of the irradiation light irradiated on the human skin sharply decreases from around 900 nm with a peak at around 800 nm, and rises again around 1000 nm as a minimum value. Specifically, for example, the reflectance of reflected light obtained by irradiating human skin with 870 nm light is 63%, and the reflectance of reflected light obtained by irradiating 950 nm light is 50%. %.

  This is peculiar to human skin, and it is known that the change in reflectance is moderate in the vicinity of 800 to 1000 nm in objects other than human skin (for example, hair and clothes). The wavelengths λ1 and λ2 are determined using such reflection characteristics.

  If the above-described skin detection technology is employed in an electronic device (for example, a television receiver), it is determined that the user is present while detecting human skin, and a predetermined operation is performed. If the user cannot be detected, it can be determined that the user is gone and the predetermined operation is suspended, so that operation control according to the presence or absence of the user can be performed.

  Furthermore, this skin detection technology is applied so that the user can use his / her hand to create a predetermined posture (posture) or move (gesture). It is conceivable that the electronic device detects and executes a predetermined operation according to the posture or gesture.

  As described above, if the skin detection technology or its application technology is adopted for the electronic device, the user can operate the electronic device without using a remote controller or the like.

JP 2006-47067 A

  As described above, in the skin detection technology, in order to widen the detectable range so as not to limit the position of the user to be detected, the number of light sources is increased and arranged at a plurality of different positions, or the output of each light source is set. It will be strengthened.

  However, in the skin detection technology, it is necessary to uniformly irradiate the light to be detected with the light of λ1 and the light of λ2 with the same illuminance. Therefore, when the number of light sources is increased and arranged at a plurality of different positions However, a mechanism for uniformly distributing the light of λ1 and the light of λ2 with the same illuminance is necessary.

  The present invention has been made in view of such a situation. In the case where a plurality of light sources are used, the light of λ1 and the light of λ2 are uniformly distributed with the same illuminance.

  The detection device according to the first aspect of the present invention includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength. A plurality of light source groups for irradiating the subject, a plurality of light source group control means for controlling the plurality of light source groups, respectively, and imaging the subject when the subject is irradiated with light of the first wavelength An imaging means for generating a second image by imaging the subject when the subject is irradiated with light of the second wavelength, and generating the first image. Image processing means for detecting a skin region indicating the skin of the subject on the image based on the first image and the second image.

  The light source group control means controls the illuminance of the first wavelength light and the illuminance of the second wavelength light to be uniformly distributed in the irradiation range of the light source group to be controlled. it can.

  The light source group control means is configured to irradiate the first image when the light of the first wavelength and the light of the second wavelength are irradiated by the light source group to be controlled. The corresponding light source group can be controlled such that the luminance difference of the second image is equal to or less than a predetermined threshold value.

  The light source group control means may control the corresponding light source group so that the brightness of the second image is 85% or more with respect to the brightness of the first image.

  The light source group control means may control the corresponding light source group so that the brightness of the second image is 95% or more with respect to the brightness of the first image.

  The light source group control means may adjust a current supplied to the light source group or control the light source group by PWM (Pulse Width Modulation) dimming.

  The light source group control unit adjusts a first current supplied to the first light emitting unit forming the light source group and a second current supplied to the second light emitting unit forming the light source group. By doing so, the light source group can be controlled.

    The detection device according to the first aspect of the present invention may further include a generation unit that generates a control signal for controlling the controlled device based on the detected skin region.

  The first wavelength is a value in a range from 630 nm to 1000 nm, and the second wavelength is a value in a range from 900 nm to 1100 nm, and is longer than the first wavelength. Can do.

  The detection method according to the first aspect of the present invention includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength. Based on a plurality of light source groups that irradiate a subject, a plurality of light source group control means for controlling each of the plurality of light source groups, an imaging means that images the subject and generates an image, and the generated image And a light source control means for controlling the light source group to emit light having the first wavelength. The subject is irradiated, and the imaging unit images the subject when the subject is irradiated with light of the first wavelength to generate a first image, and the light source control unit includes the light source. Controlling the group to emit light of the second wavelength The subject is irradiated, and the imaging unit images the subject when the subject is irradiated with light of the second wavelength to generate a second image, and the image processing unit is generated. And detecting a skin region indicating the skin of the subject on the image based on the first and second images.

  In the first aspect of the present invention, the plurality of light source groups are controlled by the corresponding light source group control means.

  An electronic device according to a second aspect of the present invention includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength. A plurality of light source groups for irradiating the subject, a plurality of light source group control means for controlling the plurality of light source groups, respectively, and imaging the subject when the subject is irradiated with light of the first wavelength An imaging means for generating a second image by imaging the subject when the subject is irradiated with light of the second wavelength, and generating the first image. An image processing unit for detecting a skin region indicating the skin of the subject on the image based on the first image and the second image; a generating unit for generating a control signal based on the detected skin region; Execute predetermined processing according to the control signal And a process execution means.

  In the second aspect of the present invention, the plurality of light source groups are controlled by the corresponding light source group control means.

  According to the first aspect of the present invention, even when a plurality of light sources are used, the light of λ1 and the light of λ2 can be uniformly distributed with the same illuminance. Therefore, the detectable range can be expanded.

  According to the second aspect of the present invention, even when a plurality of light sources are used, the light of λ1 and the light of λ2 can be uniformly distributed with the same illuminance. Therefore, the user can control the electronic device from the expanded detectable range.

It is a block diagram which shows the basic structural example of a skin detection apparatus. It is a block diagram which shows the detailed structural example of the light source control part of FIG. 1, and a 1st and 2nd light source group. It is a block diagram which shows the structural example of the skin detection apparatus to which this invention is applied. It is a block diagram which shows the detailed structural example of the 1st and 2nd light source control part of FIG. 3, and a 1st and 2nd light source group. It is a flowchart explaining a light source illumination intensity adjustment process.

  Hereinafter, the best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.

<1. Basic configuration example of skin detection device>
First, the basic structure of the skin detection device that is the basis of the present invention will be described. FIG. 1 shows a basic configuration example of a skin detection apparatus.

  The skin detection device 10 uses a user's hand or the like as a detection target, determines a posture or a gesture by the user's hand or finger based on the detection result, and controls various devices for controlling the controlled device in accordance with the determination result. The control signal is generated and output.

  The skin detection device 10 includes a light source control unit 11, a first light source group 12-1, a second light source group 12-2, an imaging control unit 13, an imaging unit 14, an image processing unit 15, and a control signal generation unit 16. The

  The light source control unit 11 supplies driving power to the first light source group 12-1 and the second light source group 12-2, and adjusts the current value to thereby adjust the first light source group 12-1 and the first light source group 12-1. The irradiation timing and illuminance of the two light source group 12-2 are controlled. Instead of adjusting the current value in the light source control unit 11, the first light source group 12-1 and the second light source group 12-2 may be PWM (Pulse Width Modulation) dimmed.

  The first light source group 12-1 and the second light source group 12-2 are each composed of a plurality of LEDs, and each LED emits light by a power supplied from the light source control unit 11 and irradiates a predetermined direction. In addition, the approximate triangle which makes each vertex the 1st light source group 12-1 and the 2nd light source group 12-2 in FIG. 1 shall show each irradiation range.

  FIG. 2 shows a detailed configuration example of the first light source group 12-1 and the second light source group 12-2.

  The first light source group 12-1 includes one or more (21 in the figure) LEDs 21 that emit light of wavelength λ1, and one or more (3 in the figure) that emits light of wavelength λ2. Each of the LEDs 22 is connected in series. A current A <b> 1 from the light source control unit 11 is supplied to the LED 21. A current A <b> 2 from the light source control unit 11 is supplied to the LED 22.

  Here, the wavelength λ1 is a value in the range of 630 nm to 1000 nm, the wavelength λ2 is a value in the range of 900 nm to 1100 nm, and the wavelength λ2 is longer than the wavelength λ1 (λ1 <λ2). .

  Similarly, the second light source group 12-2 includes at least one LED 31 (3 in the figure) that emits light having a wavelength λ1 and one or more LEDs 31 that emit light at a wavelength λ2 (in the case, The LED 32 of 3) is connected in series. The LED 31 is supplied with a current A1 from the light source control unit 11 via the first light source group 12-1. The LED 32 is supplied with the current A2 from the light source control unit 11 via the first light source group 12-1.

  Returning to FIG. The imaging control unit 13 controls the imaging timing by the imaging unit 14 in synchronization with the irradiation timing control of the irradiation light by the light source control unit 11. The imaging unit 14 continuously images the detection target according to the control from the imaging control unit 13. Hereinafter, an image captured when the light of wavelength λ1 is irradiated is referred to as a first image, and an image captured when the light of wavelength λ2 is irradiated is referred to as a second image. The imaging unit 14 outputs the first and second images that are sequentially generated to the image processing unit 15.

  The image processing unit 15 specifies the position of the user's hand on the first or second image based on the first and second images sequentially input from the imaging unit 14.

  Specifically, for example, a difference image in which a difference value d (= Y1−Y2) between the luminances Y1 and Y2 between corresponding pixels of the first image and the second image is generated as a pixel value is generated. By binarizing d by comparing it with a predetermined threshold value, a binarized image is generated. Next, the skin area of the subject is specified based on the binarized image. Furthermore, among the areas specified as the skin area, an area having the highest average luminance is specified as an area (hand area) corresponding to the user's hand. The identification results are sequentially output to the control signal generator 16. Note that the above description is an example of a process for specifying a hand region based on skin detection, and the present invention is not limited to this.

  The control signal generation unit 16 detects at least one of a posture or a gesture by the user based on the position of the hand region sequentially input from the image processing unit 15, generates a control signal based on the detection result, and outputs the control signal to the controlled device To do. In the controlled device, a predetermined operation is executed in accordance with the control signal.

  By the way, about each LED which comprises the 1st light source group 12-1 and the 2nd light source group 12-2, the light emission efficiency is ideally the same, ie, when the same electric power is supplied, the same illumination intensity However, in reality, the luminous efficiency of each LED varies. Therefore, while supplying a common current to the first light source group 12-1 and the second light source group 12-2, the irradiation range of the first light source group 12-1 and the irradiation range of the second light source group 12-2 In both cases, it is difficult to set the currents A1 and A2 so that the illuminance of the light of wavelength λ1 and the illuminance of the light of wavelength λ2 are uniformly distributed.

  Therefore, for the currents A1 and A2, the illuminance of the light with the wavelength λ1 and the light with the wavelength λ2 in the region where the irradiation range of the first light source group 12-1 and the irradiation range of the second light source group 12-2 overlap. The illuminance is adjusted to be evenly distributed. However, in such an adjustment, the detectable range in which the detection target can be accurately detected is an area where the irradiation range of the first light source group 12-1 and the irradiation range of the second light source group 12-2 overlap. It will be limited to.

  Therefore, in the present specification, the following embodiments are proposed so that the detectable range becomes wider.

<2. Embodiment>
[Configuration Example of Skin Detection Device 50]
FIG. 3 shows a configuration example of the skin detection apparatus 50 according to the present embodiment.

  The skin detection device 50 uses a user's hand or the like as a detection target, determines a posture or gesture by the user's hand or finger based on the detection result, and controls the controlled device in accordance with the determination result. Various control signals are generated and output.

  The skin detection device 50 includes a first light source control unit 51, a first light source group 52, a second light source control unit 53, a second light source group 54, an imaging control unit 55, an imaging unit 56, an image processing unit 57, and a control signal generation. The unit 58 is configured.

  The first light source controller 51 controls the irradiation timing and illuminance of the first light source group 52 by supplying driving power to the first light source group 52 and adjusting the current value.

  The first light source group 52 includes a plurality of LEDs, and each LED emits light by a power supplied from the first light source control unit 51 to irradiate a predetermined direction. In FIG. 3, a substantially triangular shape having the first light source group 52 as a vertex indicates an irradiation range. The same applies to a substantially triangular shape having the second light source group 54 as a vertex.

  The second light source control unit 53 controls the irradiation timing and illuminance of the second light source group 54 by supplying driving power to the second light source group 54 and adjusting the current value.

  The second light source group 54 includes a plurality of LEDs, and each LED emits light in a predetermined direction by the power supplied from the second light source control unit 53.

  FIG. 4 shows a detailed configuration example of the first light source group 52 and the second light source group 54.

  The first light source group 52 includes at least one LED 61 (3 in the figure) that emits light having a wavelength λ1 and one or more (3 in this case) LEDs 62 that emit light at a wavelength λ2. Are connected in series. The LED 61 is supplied with the current A11 from the first light source control unit 51. The LED 62 is supplied with the current A21 from the first light source controller 51.

  Here, the wavelength λ1 is a value in the range of 630 nm to 1000 nm, the wavelength λ2 is a value in the range of 900 nm to 1100 nm, and the wavelength λ2 is longer than the wavelength λ1 (λ1 <λ2). .

  Similarly, the second light source group 54 includes one or more LEDs 71 that emit light having a wavelength λ1 (3 in the figure) and one or more LEDs 71 that emit light having a wavelength λ2 (3 in the figure). The LEDs 72 are connected in series. The LED 71 is supplied with the current A12 from the second light source control unit 53. The LED 72 is supplied with the current A22 from the second light source control unit 53.

  In addition, about each LED which comprises the 1st light source group 52 and the 2nd light source group 54, the luminous efficiency is ideally the same, ie, the same illumination intensity can be obtained when the same electric power is supplied. However, in reality, the luminous efficiency of each LED varies.

  Returning to FIG. The imaging control unit 55 controls the imaging timing by the imaging unit 56 in synchronization with the irradiation light irradiation timing control by the first light source control unit 51 and the second light source control unit 53. The imaging unit 56 continuously images the detection target according to the control from the imaging control unit 13, generates first and second images, and outputs the first and second images to the image processing unit 57.

  The image processing unit 57 specifies the position of the user's hand on the first or second image based on the first and second images sequentially input from the imaging unit 56. The specific processing is the same as that of the image processing unit 15 in FIG.

  The control signal generation unit 58 detects at least one of a posture or a gesture by the user based on the position of the hand region sequentially input from the image processing unit 57, generates a control signal based on the detection result, and outputs the control signal to the controlled device. To do. In the controlled device, a predetermined operation is executed in accordance with the control signal.

  The control signal generator 58 does not generate a control signal, and the position of the hand region sequentially input from the image processing unit 57 is supplied to the controlled device, and the non-control device sets the position of the hand region. Based on this, at least one of a posture and a gesture by the user may be detected and a control signal may be generated.

  As described above, the difference between the skin detection device 50 and the skin detection device 10 is that the first light source control unit 51 or the second light source control unit 53 is provided for each of the first light source group 52 and the second light source group 54. It is being done. This makes it possible to set the currents A11 and A21 so that the illuminance of the light with the wavelength λ1 and the illuminance of the light with the wavelength λ2 are uniformly distributed in the irradiation range of the first light source group 52. In the irradiation range of the light source group 54, the currents A12 and A22 can be set so that the illuminance of the light having the wavelength λ1 and the illuminance of the light having the wavelength λ2 are uniformly distributed.

[Description of operation]
Next, the currents A11 and A21 supplied from the first light source control unit 51 to the first light source group 52 and the currents A12 and A22 supplied from the second light source control unit 53 to the second light source group 54 are appropriately set. A process for equalizing the illuminance distribution (hereinafter referred to as a light source illuminance adjustment process) will be described.

  FIG. 5 is a flowchart for explaining the light source illuminance adjustment processing. This light source illuminance adjustment processing is executed at the stage of shipping the skin detection device 50 or installing the skin detection device 50.

  In step S1, all the LEDs constituting the first light source group 52 and the second light source group 54 are turned off (extinguished).

  In step S2, the first light source control unit 51 starts supplying the current A11 to the LED 61 having the wavelength λ1 of the first light source group 52, and the luminance at a predetermined position on the optical axis of the LED 61 is a predetermined reference value. The current A11 is adjusted so that Here, the brightness means that a reflecting plate having the same reflectivity with respect to the light of wavelength λ1 and the light of wavelength λ2 is arranged at a predetermined position on the optical axis of the LED 61, and this is imaged by the imaging unit 56. It shall refer to the brightness of the resulting image. The same applies to the following.

  In step S <b> 3, the first light source control unit 51 starts supplying the current A <b> 21 to the LED 62 having the wavelength λ <b> 2 of the first light source group 52. The current A21 is adjusted so that the difference from the luminance of the current becomes equal to or less than a predetermined threshold.

  Note that the predetermined threshold value is set to be equal to or lower than the reflectance so that the difference in reflectance between the light of wavelength λ1 and the light of wavelength λ2 in human skin can be detected. Specifically, when the reflectance is assumed to be 15%, the current A21 is adjusted so that the luminance of the light having the wavelength λ1 is 100 and the luminance of the light having the wavelength λ2 is larger than 85. Alternatively, it is simply 3 to 5% or less. Specifically, the current A21 is adjusted so that the luminance of the light having the wavelength λ1 is 100 and the luminance of the light having the wavelength λ2 is larger than 95 to 97.

  By the processing in step S3, the illuminance of the light of wavelength λ1 and the illuminance of the light of wavelength λ2 in the irradiation range of the first light source group 52 are uniformly distributed.

  Next, in step S4, all the LEDs constituting the first light source group 52 are turned off (extinguished).

  In step S5, the second light source control unit 53 starts supplying the current A12 to the LED 71 having the wavelength λ1 of the second light source group 54, and the luminance at a predetermined position on the optical axis of the LED 71 is a predetermined reference value. The current A12 is adjusted so that In step S 6, the second light source control unit 53 starts supplying the current A 22 to the LED 72 having the wavelength λ 2 of the second light source group 54, and the luminance of the wavelength λ 1 and the wavelength λ 2 in the irradiation range of the second light source group 54. The current A21 is adjusted so that the difference from the luminance of the current becomes equal to or less than a predetermined threshold.

  By the process of step S6, the illuminance of the light with the wavelength λ1 and the illuminance of the light with the wavelength λ2 in the irradiation range of the second light source group 54 are uniformly distributed.

  In step S7, all the LEDs constituting the first light source group 52 and the second light source group 54 are turned on (lighted). That is, the first light source control unit 51 supplies adjusted currents A11 and A21 to the first light source group 52, and the second light source control unit 53 adjusts the current A12 adjusted to the second light source group 54. , A22 is supplied.

  In step S8, the light of wavelength λ1 in the irradiation range of the first light source group 52, the irradiation range of the second light source group 54, and the overlapping region of the irradiation range of the first light source group 52 and the irradiation range of the second light source group 54. It is confirmed that the difference between the brightness of light and the light of wavelength λ2 is equal to or less than a predetermined threshold. If it cannot be confirmed that the luminance difference is equal to or smaller than the predetermined threshold, the process returns to step S1 and the subsequent processing is repeated. On the other hand, when it can be confirmed that the difference in luminance is equal to or smaller than the predetermined threshold, the light source illuminance adjustment processing is terminated.

  According to the light source illuminance adjustment processing described above, the irradiation range of the first light source group 52, the irradiation range of the second light source group 54, and the irradiation range of the first light source group 52 and the irradiation range of the second light source group 54 are as follows. In the overlapping region, the illuminance of the light having the wavelength λ1 and the illuminance of the light having the wavelength λ2 are uniformly distributed. Therefore, the irradiation range of the first light source group 52, the irradiation range of the second light source group 54, and the overlapping region of the irradiation range of the first light source group 52 and the irradiation range of the second light source group 54 accurately detect the detection target. A possible detectable range can be obtained.

  In the present embodiment, the number of light source groups is two, but the number of light source groups may be three or more. In that case, the light source control unit may be provided in association with each light source group.

  The embodiments of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 50 Skin detection apparatus, 51 1st light source control part, 52 1st light source group, 53 2nd light source control part, 54 2nd light source group, 55 Imaging control part, 56 Imaging part, 57 Image processing part, 58 Control signal generation part

Claims (11)

A plurality of light source groups configured to irradiate a subject, each of which includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength;
A plurality of light source group control means for respectively controlling the plurality of light source groups;
Imaging the subject when the subject is irradiated with light of the first wavelength to generate a first image and the subject when the subject is irradiated with light of the second wavelength Imaging means for imaging a subject to generate a second image;
A detection apparatus comprising: an image processing unit configured to detect a skin area indicating the skin of the subject on the image based on the generated first and second images. The light source group control means performs control so that the illuminance of light of the first wavelength and the illuminance of light of the second wavelength are uniformly distributed in the irradiation range of the light source group to be controlled. Detection device. The light source group control means is configured to irradiate the first image when the light of the first wavelength and the light of the second wavelength are irradiated by the light source group to be controlled. The detection device according to claim 1 or 2, wherein the corresponding light source group is controlled so that a luminance difference of the second image of the second image is equal to or less than a predetermined threshold value. The detection device according to claim 3, wherein the light source group control unit controls the corresponding light source group so that the luminance of the second image is 85% or more with respect to the luminance of the first image. The detection device according to claim 4, wherein the light source group control unit controls the corresponding light source group so that a luminance of the second image with respect to a luminance of the first image is 95% or more. The detection device according to claim 2, wherein the light source group control unit adjusts a current supplied to the light source group or controls the light source group by PWM (Pulse Width Modulation) light control. The light source group control unit adjusts a first current supplied to the first light emitting unit forming the light source group and a second current supplied to the second light emitting unit forming the light source group. The detection device according to claim 6, wherein the light source group is controlled. The detection device according to claim 1, further comprising a generation unit that generates a control signal for controlling the controlled device based on the detected skin region. The first wavelength is a value in the range of 630 nm to 1000 nm;
The detection apparatus according to claim 2, wherein the second wavelength is a value in a range of 900 nm to 1100 nm and is longer than the first wavelength. A plurality of light source groups configured to irradiate a subject, each of which includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength;
A plurality of light source group control means for respectively controlling the plurality of light source groups;
Imaging means for imaging the subject to generate an image;
In a detection method of a detection apparatus, comprising: an image processing unit that detects a skin region indicating the skin of the subject on an image based on the generated image;
The light source control means controls the light source group to irradiate the subject with light of the first wavelength;
The imaging means images the subject when the subject is irradiated with light of the first wavelength to generate a first image;
The light source control means controls the light source group to irradiate the subject with light of the second wavelength;
The imaging means captures the subject when the subject is irradiated with light of the second wavelength and generates a second image;
A detection method comprising: a step of detecting a skin region indicating the skin of the subject on an image based on the generated first and second images. A plurality of light source groups configured to irradiate a subject, each of which includes a first light emitting unit that emits light having a first wavelength and a second light emitting unit that emits light having a second wavelength different from the first wavelength;
A plurality of light source group control means for respectively controlling the plurality of light source groups;
Imaging the subject when the subject is irradiated with light of the first wavelength to generate a first image and the subject when the subject is irradiated with light of the second wavelength Imaging means for imaging a subject to generate a second image;
Image processing means for detecting a skin area indicating the skin of the subject on the image based on the generated first and second images;
Generating means for generating a control signal based on the detected skin area;
An electronic device comprising: process execution means for executing a predetermined process in accordance with the generated control signal.

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