Imaging apparatus, control method of imaging apparatus and program

Abstract

To provide an imaging apparatus and the like which can reduce the power consumption of the imaging apparatus by determining the state of a user in the time of subject imaging.SOLUTION: An imaging apparatus comprises: a first imaging unit 101 for imaging a subject; a second imaging unit 103 for imaging the rear direction; an operation unit 102 which receives an operation by a user; an imaging intention determination unit 104 which determines whether or not there is the imaging intention of the user on the basis of the photographed image of the rear direction when the operation to the operation unit 102 is not performed after execution of subject imaging by the first imaging unit 101; and a control unit 105 which brings the operation of the first imaging unit 101 into a power-saving imaging operation state being such a state in which it can perform imaging at low power consumption when it is determined that there is no imaging intention.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an imaging device, a control method for an imaging device, and a program. [Background technology]

[0002] Conventionally, imaging devices equipped with multiple imaging units have been known. Patent Document 1 (Patent Document 1) discloses a power-saving, combined camera device. The disclosed camera device includes a stereo camera pair including a first camera and a second camera. The disclosed camera device includes a system control unit capable of independently turning on and off the first camera and the second camera. Additionally, the camera device includes a processing unit that receives a first image via the first camera and detects a scene type associated with the first image. Furthermore, the camera device determines whether the scene type is suitable for stereo capture and performs parallax difference detection to detect whether the first image can be accurately resolved.

[0003] In response to determining that the first image can be accurately resolved, the camera device can stereo capture the first image and the second image via the stereo camera pair, and reduce power consumption of the digital camera by preventing the second camera from capturing images in scenes where the stereo effect is difficult to achieve.

[0004] Furthermore, Patent Document 2 discloses an imaging device that includes a first imaging means that captures an image of a subject and generates image data, and a second imaging means that captures an image of a user for a predetermined period before and after capturing the image of the subject. This imaging device analyzes in detail the state of the user before and after capturing the image captured by the second imaging means. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2018-515966 [Patent Document 2] Patent No. 6180285 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technology disclosed in "Patent Document 1" is not related to technology for capturing an image of the user himself, and it is not possible to grasp the state of the user at the time of capturing an image. Furthermore, the technology disclosed in "Patent Document 2" does not take into consideration the power consumption of the second imaging means for capturing an image of the user.

[0007] An object of the present invention is to provide an imaging device, an imaging device control method, and a program that can reduce power consumption of the imaging device by determining the state of a user when capturing an image of a subject. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides an imaging device comprising a first imaging unit for imaging a subject, a second imaging unit for imaging a rear view, and an operation unit for accepting operations by a user, the imaging device comprising: an imaging intention determination unit that, when no operation is performed on the operation unit after the first imaging unit has performed imaging of the subject, determines whether or not the user has an intention to capture an image based on the image captured in the rear view; and a control unit that, when it is determined that the user does not have an intention to capture an image, switches the operation of the first imaging unit to a power-saving imaging operation state in which imaging can be performed with low power consumption. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an imaging device, a control method for an imaging device, and a program that can reduce the power consumption of the imaging device by determining the state of the user when capturing an image of a subject. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic explanatory diagram of the appearance of an imaging device 100 according to an embodiment of the present invention. [Figure 2] FIG. 1 is a functional configuration diagram of an imaging device 100. [Figure 3] FIG. 1 is a flowchart illustrating the "first embodiment." [Figure 4] FIG. 10 is a flowchart illustrating the "second embodiment." [Figure 5] FIG. 10 is a flowchart illustrating the "third embodiment." DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited to the configurations described in the embodiments. First, a first embodiment of the present invention will be described.

[0012] First Embodiment An imaging device according to a "first embodiment" will be described with reference to FIGS.

[0013] <Imaging device overview> Fig. 1 is an external view of an imaging device 100 according to the first embodiment. Fig. 1(a) is a rear view of the imaging device 100, and Fig. 1(b) is a perspective view of the front of the imaging device 100. As shown in Figs. 1(a) and 1(b), the imaging device 100 includes a first imaging unit 101, an operation unit 102, and a second imaging unit 103.

[0014] As shown in FIG. 1(b), the first imaging unit 101 is provided on the front side of the imaging device 100. The first imaging unit 101 has an imaging lens. An image of a subject is formed on an imaging element (not shown) via the imaging lens. As shown in FIG. 1(a), the second imaging unit 103 is provided on the rear side of the imaging device 100. The second imaging unit 103 captures an image of the user or the like facing rearward from the imaging device 100. A display unit 107 is also provided on the rear side of the imaging device 100. The display unit 107 displays various information such as the captured image and the status of the imaging device 100. This captured image may or may not include imaging information about the user himself or herself.

[0015] The operation unit 102 accepts various operations from the user. The operation unit 102 includes a shutter button and the like that the user uses to instruct the first imaging unit 101 to capture an image of a subject. The operation unit 102 includes various operators such as various switches, buttons, and touch panels.

[0016] <Functional configuration> Fig. 2 is a functional configuration diagram of the imaging device 100. The imaging device 100 has a first imaging unit 101 for capturing an image of a subject, an operation unit 102, a second imaging unit 103 for capturing an image in the rear direction of the imaging device 100, an imaging intention determination unit 104, a system timer unit 106, and a control unit 105 for controlling these. Note that the first imaging unit 101, second imaging unit 103, and operation unit 102 shown in Fig. 2 have functions in common with the first imaging unit 101, second imaging unit 103, and operation unit 102 described with reference to Fig. 1, and therefore will not be described again.

[0017] The imaging intention determination unit 104 determines the user's imaging intention based on the captured image captured by the second imaging unit 103. If the user's face is included in the captured image captured by the second imaging unit 103, the imaging intention determination unit 104 determines that the user "has imaging intention." On the other hand, if the user's face is not included in the captured image captured by the second imaging unit 103, the imaging intention determination unit 104 determines that the user "does not have imaging intention."

[0018] Furthermore, the control unit 105 controls the entire imaging device 100. The control unit 105 has various functions necessary for controlling the imaging device 100. The system timer unit 106 measures the elapsed time from a predetermined timing as a starting point in response to an instruction from the control unit 105. When a set predetermined time has elapsed from the starting point, the system timer unit 106 notifies the control unit 105.

[0019] The first imaging unit 101 and the second imaging unit 103 are controlled by the control unit 105 to one of a "normal imaging operation state," a "power-saving imaging operation state," and an "imaging operation stopped state." Furthermore, the first imaging unit 101 and the second imaging unit 103 are in a lower power consumption state in the "power-saving imaging operation state (first operation state)" than in the "normal imaging operation state (second operation state)." The "power-saving imaging operation state" is a state in which imaging is possible with low power consumption. Furthermore, the first imaging unit 101 and the second imaging unit 103 are in a lower power consumption state in the "imaging operation stopped state" than in the "power-saving imaging operation state." In other words, the "imaging operation stopped state (third operation state)" consumes the least power, but the "imaging operation stopped state" is a state in which imaging is not possible because power supply to the imaging element is also suppressed. The "power-saving imaging operation state" consumes the next least power, and the "normal imaging operation state" consumes the most power.

[0020] Furthermore, when the imaging device 100 is in the "subject through image display operating state" (the state in which the subject is displayed), by switching to the "power-saving imaging operating state," the period during which the subject image is read from the imaging element and the pixel resolution of the read image are reduced compared to the "normal imaging operating state." This reduces the power consumption of the imaging element compared to the "normal imaging operating state," thereby achieving even lower power consumption. Furthermore, by switching to the "imaging operation stop state" in the "power-saving imaging operating state," even lower power consumption can be achieved.

[0021] <Example 1> Next, the operation of the imaging device 100 will be described with reference to Fig. 3. Note that the processing in this flowchart starts from a state in which a user's imaging instruction via the operation unit 102 is accepted and imaging of a subject is completed by the first imaging unit 101. At this time, the control unit 105 controls the first imaging unit 101 to be in a "normal imaging operation state" and the second imaging unit 103 to be in an "imaging operation stop state."

[0022] First, in step S301, the control unit 105 determines whether or not the user has performed various operations on the operation unit 102. If the control unit 105 determines that the user has performed an operation on the operation unit 102, for example, an exposure adjustment operation using the "exposure correction button" (Yes in S301), the process returns to step S301. That is, in S301, the control unit 105 repeatedly determines whether or not the user has performed various operations on the operation unit 102. On the other hand, if the control unit 105 determines that the user has not performed an operation on the operation unit 102 (No in S301), the process proceeds to step S302.

[0023] Next, in step S302, the control unit 105 controls the second imaging unit 103 to change to a "normal imaging operation state." Next, in step S303, the control unit 105 controls the second imaging unit 103 to capture an image in the rear direction of the imaging device 100. Next, in step S304, the control unit 105 controls the second imaging unit 103 to change to an "imaging operation stop state."

[0024] Next, in step S305, the imaging intention determination unit 104 determines whether or not the user has an "imaging intention." Specifically, the imaging intention determination unit 104 determines whether or not the user's face is included in the captured image captured by the second imaging unit 103 in step S303. If the user's face is included in the captured image captured by the second imaging unit 103 (Yes in S305), the imaging intention determination unit 104 determines that the user has an "imaging intention," and the process returns to step S301. In step S301, the control unit 105 again determines whether or not the user has performed various operations on the operation unit 102.

[0025] On the other hand, if the user's face is not included in the captured image captured by the second imaging unit 103 (No in step S305), the imaging intention determination unit 104 determines that there is no imaging intention, and the process proceeds to step S306. In step S306, the control unit 105 controls the first imaging unit 101 to change from the "normal imaging operation state" to the "power-saving imaging operation state," and the process in FIG. 3 ends.

[0026] As described above, in the first embodiment, immediately after the first imaging unit 101 has performed imaging, the second imaging unit 103 performs imaging in a state in which the user has not performed any operations on the operation unit 102. Then, if the user's face is not detected in the image captured by the second imaging unit 103, the control unit 105 changes the first imaging unit 101 to a "power-saving imaging operation state." Conversely, if the user's face is detected in the image captured by the second imaging unit 103, the control unit 105 changes the first imaging unit 101 to a "normal imaging operation state" and does not perform low power consumption.

[0027] That is, if the user has no "intention to capture an image" after capturing an image of a subject using the image capturing device 100, it is possible to reduce power consumption by placing the image capturing device 100 in a "power-saving image capturing operation state." Specifically, if the user is operating the operation unit 102 of the image capturing device 100, it is possible to prevent an increase in power consumption of the image capturing device 100 by performing control so that the second image capturing unit 103 does not continue in the "normal image capturing operation state."

[0028] Second Embodiment Next, a second embodiment will be described. The configuration of the imaging device 100 in the second embodiment is the same as that of the imaging device 100 described in Fig. 2. When the user is not operating the operation unit 102 and the user is present within the imaging angle of view of the second imaging unit 103, the user's face is captured by imaging by the second imaging unit 103 (S303 in Fig. 3). For this reason, even though the user has no "imaging intention," imaging by the second imaging unit 103 and "imaging intention determination processing" by the imaging intention determination unit 104 are repeated.

[0029] In the second embodiment, we will explain control for further reducing power consumption of the imaging device 100 in cases where the second imaging unit 103 captures an image of the user's face and determines that there is an "intention to capture an image" even though there is no "intention to capture an image."

[0030] 4 is a flowchart for explaining the second embodiment. As explained in the first embodiment, the process in this flowchart starts from a state in which a user's image capture instruction via the operation unit 102 is accepted and the first image capture unit 101 has completed capturing an image of a subject. At this time, the control unit 105 controls the first image capture unit 101 to be in a "normal image capture operation state" and the second image capture unit 103 to be in an "image capture operation stopped state."

[0031] <Example 2> In the flowchart shown in Fig. 4, the same processes as those in the steps shown in Fig. 3 are denoted by the same reference numerals in boxes (including judgment boxes) in the flowchart. First, in step S401, the control unit 105 controls the system timer unit 106 to measure a "duration of no operation" starting from the timing when the user stops operating the operation unit 102. At the same time, the control unit 105 controls the system timer unit 106 to issue a notification when the time measured by the system timer unit 106 reaches the "duration of no operation". This starts time measurement (counting) of the "duration of no operation". In addition, the "duration of no operation" is set to, for example, "5 seconds".

[0032] Next, in step S402, the control unit 105 determines whether or not the user has performed various operations on the operation unit 102. If the control unit 105 determines that the user has performed an operation on the operation unit 102, for example, an exposure adjustment operation using the "exposure correction button" (Yes in S402), the control unit 105 proceeds to step S404. In step S404, the control unit 105 clears the count value of the "non-operation duration" of the system timer unit 106, and returns to step S402. That is, in step S402, the control unit 105 repeats the determination of whether or not the user has performed various operations on the operation unit 102. On the other hand, if the control unit 105 determines that the user has not performed an operation on the operation unit 102 (No in step S402), the control unit 105 proceeds to step S403.

[0033] Next, in step S403, the control unit 105 determines whether or not it has received a notification indicating that the count value of the "non-operation duration" in the system timer unit 106 has continued for a predetermined time (for example, "5" seconds). If the control unit 105 determines that there has been no notification from the system timer unit 106 (No in step S403), it proceeds to step S405. On the other hand, if the control unit 105 determines that there has been a notification from the system timer unit 106 (Yes in step S403), it proceeds to step S409. In step S409, the control unit 105 changes control of the first imaging unit 101 from the "normal imaging operation state" to the "power-saving imaging operation state," and ends the processing shown in FIG.

[0034] Next, in step S405, the control unit 105 changes control of the second imaging unit 103 to a "normal imaging operation state". Next, in step S406, the control unit 105 controls the second imaging unit 103 to capture an image in the rear direction of the imaging device 100. Next, in step S407, the control unit 105 changes control of the second imaging unit 103 to an "imaging operation stop state".

[0035] Next, in step S408, the imaging intention determination unit 104 determines whether or not the user has an "imaging intention." Specifically, in step S408, the imaging intention determination unit 104 determines whether or not the user's face is included in the captured image captured by the second imaging unit 103. If the user's face is included in the captured image captured by the second imaging unit 103 (Yes in S408), the imaging intention determination unit 104 determines that the user has an "imaging intention," and the process returns to step S402. In step S402, the control unit 105 again determines whether or not the user has performed various operations on the operation unit 102.

[0036] On the other hand, if the user's face is not included in the captured image captured by the second imaging unit 103 (No in step S408), the imaging intention determination unit 104 determines that there is no "imaging intention," and the process proceeds to step S409. In step S409, the control unit 105 controls the first imaging unit 101 to change from the "normal imaging operation state" to the "power-saving imaging operation state," and the process in FIG. 4 ends.

[0037] As described above, in the second embodiment, the system timer unit 106 is used to measure the "continuous no-operation time," which is the time during which no operation continues on the operation unit 102. When the "continuous no-operation time" has elapsed, the control unit 105, upon receiving a notification from the system timer unit 106, controls the first imaging unit 101 to change to the "power-saving imaging operation state."

[0038] Therefore, according to the second embodiment, when the second imaging unit 103 captures an image of the user while the operation unit 102 is not being operated, the imaging operation by the second imaging unit 103 and the determination process by the imaging intention determination unit 104 are prevented from being repeated for a predetermined time or longer. This predetermined time is the "no-operation duration."

[0039] Third Embodiment The third embodiment will be described below with reference to Fig. 5. The configuration of the imaging device 100 according to the third embodiment is the same as that of the imaging device 100 shown in Fig. 2. Furthermore, the second embodiment is characterized in the following respect when the second imaging unit 103 captures an image of the user while the user is not operating the operation unit 102. That is, the second embodiment is characterized in that the imaging operation by the second imaging unit 103 and the determination process by the imaging intention determination unit 104 are not repeated for a predetermined time (no-operation duration) or more.

[0040] In the third embodiment, further reduction in power consumption is achieved by limiting the period during which the imaging operation by the second imaging unit 103 and the imaging intention determination process by the imaging intention determination unit 104 are performed. The control operation of the imaging device 100 will be described below.

[0041] <Example 3> Fig. 5 is a flowchart for explaining the third embodiment. As explained in Fig. 3 and Fig. 4, the process of this flowchart starts from a state in which the imaging device 100 receives an imaging instruction from the user via the operation unit 102 and has completed imaging of a subject by the first imaging unit 101. At this time, the control unit 105 controls the first imaging unit 101 to be in a "normal imaging operation state" and the second imaging unit 103 to be in an "imaging operation stop state."

[0042] 5, the same processes as those shown in FIGS. 3 and 4 are denoted by the same reference numerals in boxes (including judgment boxes) in the flowchart. Also in the third embodiment, the imaging intention determination unit 104 determines whether or not the user has an imaging intention. As in the first embodiment, this determination is made based on whether or not the user's face is included in the captured image captured by the second imaging unit 103. If the user's face is detected, the imaging intention determination unit 104 determines that the user "has an imaging intention," whereas if the user's face is not detected, the imaging intention determination unit 104 determines that the user "does not have an imaging intention."

[0043] First, in step S501, the control unit 105 controls the system timer unit 106 to measure the "duration of no operation" starting from the timing when the user stops operating the operation unit 102. At the same time, the control unit 105 controls the system timer unit 106 to notify the control unit 105 when the time measured by the system timer unit 106 reaches the "duration of no operation". This starts the time measurement (count) of the "duration of no operation". For example, "5 seconds" is set as the "duration of no operation".

[0044] Next, in step S502, the control unit 105 causes the system timer unit 106 to measure the "imaging intention determination duration" starting from the timing when the second imaging unit 103 starts an imaging operation and the imaging intention determination unit 104 starts a determination process. At the same time, the control unit 105 controls the system timer unit 106 to issue a notification when the time measured by the system timer unit 106 reaches the "imaging intention determination measurement time." This starts time measurement (counting) of the "imaging intention determination duration." At this time, the control unit 105 sets the time until the "imaging intention determination duration" elapses and a notification is issued to be shorter (for example, 2 seconds) than the time until the "no-operation duration" elapses and a notification is issued.

[0045] Next, in step S503, the control unit 105 determines whether or not the user has performed various operations on the operation unit 102. If the control unit 105 determines that the user has performed an operation on the operation unit 102, for example, an exposure adjustment operation using the "exposure correction button" (Yes in S503), the control unit 105 proceeds to step S505. In step S505, the control unit 105 clears the count value of the "non-operation duration" of the system timer unit 106, and returns to step S503. That is, in step S503, the control unit 105 repeats the determination of whether or not the user has performed various operations on the operation unit 102. On the other hand, if the control unit 105 determines that the user has not performed an operation on the operation unit 102 (No in step S503), the control unit 105 proceeds to step S504.

[0046] Next, in step S504, the control unit 105 determines whether or not a notification has been received indicating that the count value of the "non-operation duration" in the system timer unit 106 has continued for a predetermined time (for example, "5" seconds). If the control unit 105 determines that there has been no notification from the system timer unit 106 (No in step S504), the control unit 105 proceeds to step S506. On the other hand, if the control unit 105 determines that there has been a notification from the system timer unit 106 (Yes in step S504), the control unit 105 proceeds to step S511. In step S511, the control unit 105 changes control of the first imaging unit 101 from the "normal imaging operation state" to the "power-saving imaging operation state," and ends the processing shown in FIG. 5.

[0047] Next, in S506, the control unit 105 determines whether or not it has received a notification indicating that the count value of the "imaging intention determination duration" in the system timer unit 106 has continued for a predetermined time (for example, "2" seconds). If the control unit 105 determines that there has been a notification from the system timer unit 106 (Yes in step S506), the control unit 105 proceeds to step S503. In step S503, the control unit 105 determines whether or not the user has operated the operation unit 102. After this, the imaging operation of the second imaging unit 103 and the imaging intention determination process by the imaging intention determination unit 104 are no longer executed. On the other hand, if the control unit 105 determines that there has been no notification from the system timer unit 106 (No in step S506), the control unit 105 proceeds to step S507.

[0048] Next, in step S507, the control unit 105 changes control of the second imaging unit 103 to a "normal imaging operation state". Next, in step S508, the control unit 105 controls the second imaging unit 103 to capture an image in the rear direction of the imaging device 100. Next, in step S509, the control unit 105 changes control of the second imaging unit 103 to an "imaging operation stop state".

[0049] Next, in step S510, the imaging intention determination unit 104 determines whether or not the user has an "imaging intention." Specifically, the imaging intention determination unit 104 determines whether or not the user's face is included in the captured image captured by the second imaging unit 103 in step S508. If the user's face is included in the captured image captured by the second imaging unit 103 (Yes in S510), the imaging intention determination unit 104 determines that the user has an "imaging intention," and the process returns to step S503. In step S503, the control unit 105 again determines whether or not the user has performed various operations on the operation unit 102.

[0050] On the other hand, if the user's face is not included in the captured image captured by the second imaging unit 103 (No in step S510), the imaging intention determination unit 104 determines that there is no imaging intention, and the process proceeds to step S511. In step S511, the control unit 105 changes the first imaging unit 101 from the "normal imaging operation state" to the "power-saving imaging operation state," and the process in FIG. 5 ends.

[0051] As described above, according to the third embodiment, in addition to measuring the "duration of no operation," a "duration of no operation" that is shorter than the "duration of no operation" is set, and the execution of the imaging intention determination process is limited to a predetermined period immediately after imaging is performed by the imaging device 100. This allows the imaging device 100 to reduce power consumption more quickly compared to control that sets only the "duration of no operation" in cases where imaging operations and interruptions are repeated. For example, even when the user changes from an imaging state in which the imaging device is held up to capture an image of a subject to a portable state in which the imaging device is not being used for imaging, it is possible to reduce power consumption more quickly compared to control that sets only the "duration of no operation."

[0052] In the first to third embodiments described above, examples of operational control have been described in which the imaging intent determination unit 104 performs the "imaging intent determination process" to reduce power consumption of the imaging device 100. On the other hand, applications such as capturing images of the user's state before and after imaging using the second imaging unit 103 are envisioned. In such cases, an operation unit (not shown) may be provided for setting whether or not the "imaging intent determination process" by the "imaging intent determination unit 104" needs to be executed. The control unit 105 may also be configured to perform the control in the first to third embodiments in response to operation of this operation unit (not shown).

[0053] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and variations are possible within the scope of the gist of the present invention. For example, the present invention can be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or recording medium. One or more processors in a computer of the system or device then read and execute the program. The present invention can also be realized by a circuit (e.g., an ASIC) that realizes one or more functions. [Explanation of symbols]

[0054] 100 Imaging device 101 First imaging unit 102 Operation section 103 Second imaging unit 104 Imaging intention determination unit 105 Control Unit 106 System timer section 107 Display section

Claims

1. An imaging device including a first imaging unit for imaging a subject, a second imaging unit for imaging a rear surface direction, and an operation unit for accepting an operation by a user, an imaging intention determination unit that determines whether or not a user has an imaging intention based on an image captured by the second imaging unit when no operation is performed on the operation unit after the first imaging unit has captured an image of the subject; and a control unit that, when it is determined that there is no intention to capture an image, sets the first imaging unit to the first operating state out of a first operating state in which imaging is possible and a second operating state that consumes more power than the first operating state.

2. The imaging device according to claim 1 , wherein the imaging intention determination section determines that there is a user's imaging intention when a captured image captured by the second imaging section includes a user's face.

3. The imaging device according to claim 1 , wherein the control unit changes the first imaging unit from the second operating state to the first operating state when it is determined that there is no imaging intention.

4. 2. The imaging device according to claim 1, wherein the control unit sets the first imaging unit to the first operating state when a no-operation duration time has elapsed after the first imaging unit has captured an image of a subject, the no-operation duration time being set as a time indicating that no operation is being performed continuously on the operation unit.

5. 5. The imaging device according to claim 4, wherein the control unit is further configured to, after the first imaging unit has captured an image of the subject, not perform the determination process when an imaging intention determination duration time has elapsed, the imaging intention determination duration time being set as a time indicating that the determination process will be performed by the imaging intention determination unit.

6. The imaging apparatus according to claim 5 , wherein the imaging intention determination duration is set to be shorter than the no-operation duration.

7. 7. The imaging device according to claim 1, wherein the control unit sets the second imaging unit to the second operating state after the first imaging unit captures an image of the subject.

8. The imaging device according to claim 7 , characterized in that, after the second imaging unit has performed imaging in the rear direction, the control unit switches the second imaging unit to a third operating state that consumes less power than the first operating state.

9. 9. The imaging device according to claim 8, wherein the third operating state is a state in which imaging is not possible.

10. A first imaging unit including a first image sensor for imaging a subject in a first direction; a second imaging unit including a second image sensor and configured to capture an image of a subject in a second direction opposite to the first direction; and a control unit that sets a state of the first imaging unit to a first state or a second state consuming more power than the first state depending on an image captured by the second imaging unit.

11. The imaging device described in Claim 10, characterized in that the second direction is a rear direction of the imaging device.

12. The imaging device according to claim 11, characterized in that a display unit is provided on the rear surface of the imaging device.

13. Further comprising an operation unit for accepting an operation by a user, The imaging device according to claim 10 , wherein the control unit changes the state of the second imaging unit, which is in an imaging stopped state, to an imaging operating state in response to the operation unit not being operated.

14. The imaging device described in Claim 13, characterized in that the control unit changes the state of the second imaging unit, which is in the imaging stopped state, to the imaging operation state in response to the operation unit not being operated when the period during which the operation unit is not operated does not exceed a predetermined period.

15. The imaging device described in Claim 10, characterized in that the control unit sets the state of the first imaging unit to the first state when the image does not include a human face.

16. A method for controlling an imaging device including a first imaging unit for imaging a subject, a second imaging unit for imaging a rear direction, and an operation unit for accepting an operation by a user, comprising: an imaging intention determination step of determining whether or not a user has an imaging intention based on an image captured by the second imaging unit when no operation is performed on the operation unit after the first imaging unit has captured an image of the subject; and when it is determined that there is no intention to capture an image, a control step of switching the first imaging unit to the first operating state out of a first operating state in which imaging is possible and a second operating state which consumes more power than the first operating state.

17. A method for controlling an imaging device having a first imaging section including a first image sensor and imaging a subject in a first direction, and a second imaging section including a second image sensor and imaging a subject in a second direction opposite to the first direction, comprising: A control method for an imaging device, comprising: setting a state of the first imaging unit to a first state or a second state consuming more power than the first state depending on an image captured by the second imaging unit.

18. A program for causing a computer to execute a control method for an imaging device including a first imaging unit for imaging a subject, a second imaging unit for imaging a rear direction, and an operation unit for accepting an operation by a user, the program comprising: The control method includes: an imaging intention determination step of determining whether or not a user has an imaging intention based on an image captured by the second imaging unit when no operation is performed on the operation unit after the first imaging unit has captured an image of the subject; and a control process for, when it is determined that there is no intention to capture an image, switching the first imaging unit to the first operating state out of a first operating state in which imaging is possible and a second operating state which consumes more power than the first operating state.

19. A program for causing a computer to execute a control method for an imaging device having a first imaging section including a first image sensor and imaging a subject in a first direction, and a second imaging section including a second image sensor and imaging a subject in a second direction opposite to the first direction, The control method includes: A program for setting a state of the first imaging unit to a first state or a second state consuming more power than the first state in accordance with an image captured by the second imaging unit.

Images