Exposure control device, exposure control method, and exposure control program

Abstract

To provide a technique capable of performing excellent imaging regardless of a subject under a low illuminance environment such as nighttime, in an imaging apparatus mounted on a vehicle.SOLUTION: An exposure control device (42) is configured so as to control exposure of a camera (41) mounted on an own vehicle (V). An exposure control device according to the present disclosure is applied to, for instance, an on-vehicle imaging apparatus (4) including a recording unit (43) for recording a photographed image by a camera. The exposure control device according to the present disclosure includes an event information acquisition unit (422) and an exposure control unit (423). The event information acquisition unit acquires detection information of an event for the own vehicle. The exposure control unit sets an exposure condition on the basis of the acquired detection information.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an exposure control device, an exposure control method, and an exposure control program for controlling the exposure of a camera mounted on a vehicle.

Background Art

[0002] The drive recorder described in Patent Document 1 includes a camera, an encoder, a memory drive, and a recording controller. The camera captures environmental images around the vehicle at a first frame rate or a second frame rate. The encoder encodes and multiplexes image data, date and time data, and audio data. The memory drive records the multiplexed data on a recording medium. The recording controller records the multiplexed data to be recorded on the recording medium as data at the first frame rate when the ignition switch is detected to be on, and records it as data at the second frame rate when the ignition switch is detected to be off. Further, when the ignition switch is off and image data or the like is being recorded at the second frame rate, if the impact applied to the vehicle is greater than a predetermined value, the image data or the like is recorded by switching from the second frame rate to the first frame rate for a predetermined time. Specifically, for example, while recording image data or the like at a frame rate of 1 fps, it is determined whether the impact (for example, a physical quantity such as acceleration) detected by the shock sensor exceeds a preset threshold value. This determination assumes an impact when someone forcibly opens the door or breaks the window glass for the purpose of mischief or the like against the vehicle. When the impact detected by the shock sensor exceeds the threshold value, for example, a timer of about 5 to 10 minutes is turned on. Then, shooting and recording are performed at a frame rate of 27.5 fps until this timer counts up. When the timer counts up, the shooting returns to the frame rate of 1 fps.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] For example, in a situation where the vehicle power supply is off at night, there is a demand to operate a drive recorder as a countermeasure against vehicle vandalism or hit-and-run. In such a situation, since the lighting fixtures such as the vehicle headlights are not lit, it is assumed that the brightness in the field of view is extremely low compared to the situation where the vehicle power supply is on during driving. Here, when the subject is another vehicle, the lighting fixtures of the other vehicle are lit. On the other hand, when the subject is a person, usually, the person does not wear a light-emitting body that illuminates the face. Therefore, when performing exposure control assuming that the subject is a person, there is a possibility that the image of the license plate of the other vehicle is saturated and cannot be read. In this regard, the technique described in Patent Document 1 is effective for frame dropping of the subject (that is, discontinuity of the reproduced image), but there remains a problem in imaging with appropriate exposure control according to the subject. That is, there is a problem of saturation or blackout depending on the subject.

[0005] The present disclosure has been made in view of the circumstances exemplified above. That is, the present disclosure provides a technique that enables good imaging regardless of the subject in a low illuminance environment such as at night in an imaging device mounted on a vehicle.

MEANS FOR SOLVING THE PROBLEMS

[0006] In one aspect of the present disclosure, an exposure control device (42) that controls the exposure of a camera (41) mounted on a host vehicle (V) includes: an event information acquisition unit (422) that acquires detection information of an event with respect to the host vehicle; and an exposure control unit (423) that sets an exposure condition based on the acquired detection information. The exposure control device is provided with these components. In another aspect of the present disclosure, an exposure control method for controlling the exposure of a camera (41) mounted on a host vehicle (V) is as follows: Obtain detection information of an event with respect to the host vehicle, Based on the obtained detection information, set exposure conditions. In still another aspect of the present disclosure, in an exposure control program executed by an exposure control device (42) for controlling the exposure of a camera (41) mounted on a host vehicle (V), the processes executed by the exposure control device are as follows: An event information acquisition process of obtaining detection information of an event with respect to the host vehicle, and An exposure control process of setting exposure conditions based on the obtained detection information. And the processes include the above.

[0007] In each column of the application documents, each element may be accompanied by a reference numeral in parentheses. However, such reference numerals are merely examples showing the correspondence between the same element and the specific means described in the embodiments below. Therefore, the present disclosure is not limited by the description of the above reference numerals.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0009] (Embodiment) Hereinafter, exemplary embodiments and specific examples of the present disclosure will be described with reference to the drawings as appropriate. Referring to FIG. 1, the host vehicle V is a vehicle equipped with the system 1 according to the present embodiment. The system 1 includes an in-vehicle network 2, in-vehicle sensors 3, and an in-vehicle imaging device 4.

[0010] The in-vehicle network 2 is configured to comply with a predetermined communication standard such as CAN (registered trademark of the International Bureau: International Registration No. 1048262A). CAN (registered trademark) is an abbreviation for Controller Area Network. In addition to the main network compliant with CAN (registered trademark), the in-vehicle network 2 may have a sub-network compliant with LIN, FlexRay, or the like. LIN is an abbreviation for Local Interconnect Network.

[0011] The in-vehicle sensors 3 are connected to the in-vehicle network 2 so as to detect the driving state and driving environment of the host vehicle V and output information or signals corresponding to the detection results to the in-vehicle network 2. That is, the in-vehicle sensors 3 are a general term for various sensors used for the operation control of the host vehicle V, such as a vehicle speed sensor, a yaw rate sensor, and a raindrop sensor, for convenience of illustration and description. In the present embodiment, at least an event detection sensor 31 and an illuminance sensor 32 are mounted on the host vehicle V as the in-vehicle sensors 3. The event detection sensor 31 is an impact sensor such as an acceleration sensor, for example, and is provided so as to be able to detect an event for the host vehicle V. An "event" is an event of applying an impact due to the action of an external force to the host vehicle V, and includes, for example, contact or collision with a person or another vehicle. The illuminance sensor 32 is configured to generate an output corresponding to the illuminance, that is, the brightness, around the host vehicle V.

[0012] The in-vehicle imaging device 4 includes a camera 41, a control device 42, and a recording unit 43. The camera 41 is a so-called digital camera device and includes an image sensor such as a CCD or a CMOS. CCD is an abbreviation for Charge Coupled Device. CMOS is an abbreviation for Complementary Metal Oxide Semiconductor. The camera 41 is configured to photograph at least the surroundings of the host vehicle V by being mounted on the host vehicle V. Specifically, the camera 41 is attached to a predetermined position on the front side in the passenger compartment of the host vehicle V so as to image through the windshield with at least the front of the host vehicle V as the imaging direction. The control device 42 as an exposure control device according to the present disclosure is configured to control the exposure of the camera 41. Details of the configuration of the control device 42 will be described later. The recording unit 43 is composed of a non-transitory tangible storage medium such as a flash memory and is configured to record the captured images by the camera 41 for a predetermined time in time series. In the present embodiment, the in-vehicle imaging device 4 is a so-called drive recorder and is configured to record the captured images by the camera 41 in the recording unit 43 according to the detection information by the in-vehicle sensor 3 of the event with respect to the host vehicle V.

[0013] In this embodiment, the control device 42 is configured as an in-vehicle microcomputer, i.e., an ECU, mounted on the host vehicle V. ECU is an abbreviation for Electronic Control Unit. That is, the control device 42 includes a processor composed of a CPU or an MPU, and a storage medium communicably connected to the processor, and is configured to realize a predetermined function by reading and executing a computer program from the storage medium. The storage medium includes at least a ROM or a non-volatile rewritable memory among various non-transitory physical storage media such as a ROM and a non-volatile rewritable memory. The non-volatile rewritable memory is a storage device that can rewrite information while the power is on and holds the information in a non-rewritable state while the power is off, and is, for example, a flash memory or the like. The storage medium stores various data such as initial values, maps, and lookup tables necessary for executing the above computer program together with the computer program.

[0014] As shown in FIG. 2, the control device 42 has an illuminance acquisition unit 421, an event information acquisition unit 422, an exposure control unit 423, and an image processing unit 424 as functional configurations realized on the in-vehicle microcomputer by executing a computer program. Hereinafter, an outline of these functional configurations will be described.

[0015] The illuminance acquisition unit 421 is configured to acquire the detection result of the illuminance by the illuminance sensor 32 from the illuminance sensor 32. The event information acquisition unit 422 is configured to acquire the detection information of the event by the event detection sensor 31 from the event detection sensor 31. Specifically, the event information acquisition unit 422 acquires, as the detection information, information corresponding to an impact value that is the magnitude of the impact on the host vehicle V.

[0016] The exposure control unit 423 is configured to set the exposure conditions of the camera 41. The "exposure conditions" include the shutter speed, aperture value, etc., and may also be referred to as "exposure conditions" or "exposure control items". In the present embodiment, the exposure control unit 423 sets the exposure conditions based on the event detection information by the event information acquisition unit 422 during parking of the host vehicle V in a low illuminance environment such as at night or in an indoor parking lot with few lighting devices. Specifically, the exposure control unit 423 sets the exposure conditions on the higher illuminance side than the first type of event for the second type of event in which the impact value is larger than the first type of event. The first type of event is the application of an impact to the host vehicle V by a person. The second type of event is the application of an impact to the host vehicle V by another vehicle different from the host vehicle V. The image processing unit 424 generates a recording image signal for recording in the recording unit 43 by performing various image processes such as contrast correction on the captured image signal by the camera 41.

[0017] Hereinafter, while referring to FIGS. 1 to 3, an outline of the operation of the control device 42 according to the present embodiment will be described together with the effects achieved by such a control device 42, an exposure control method, and an exposure control program executed thereby. Hereinafter, the control device 42 according to the present embodiment, as well as the exposure control method and the exposure control program executed thereby, will be collectively referred to as "the present embodiment". In the flowchart shown in FIG. 3, "S" is an abbreviation for "step".

[0018] The flowchart shown in FIG. 3 shows an exposure control routine of the in-vehicle imaging device 4 while the host vehicle V is parked. In step 101, the control device 42 determines whether there has been an event detection by the event information acquisition unit 422. If there has been an event detection (i.e., step 101 = YES), the control device 42 proceeds with the process to step 102. On the other hand, if there has been no event detection (i.e., step 101 = NO), the control device 42 skips the processes after step 102 and temporarily ends this routine.

[0019] In step 102, the control device 42 determines whether the detected value of the impact value in the current event exceeds a predetermined threshold. When the detected value of the impact value exceeds the predetermined threshold (i.e., step 102 = YES), the control device 42 advances the process to step 103. On the contrary, when the detected value of the impact value does not exceed the predetermined threshold (i.e., step 102 = NO), the control device 42 skips the processes after step 103 and temporarily ends this routine.

[0020] In step 103, the control device 42 determines whether the current parking environment of the host vehicle V is a low illuminance environment based on the output of the illuminance sensor 32. When it is a low illuminance environment (i.e., step 103 = YES), after the control device 42 executes the process of step 104, it temporarily ends this routine. In step 104, the control device 42 corrects the exposure condition to the low sensitivity side, i.e., the high illuminance side. On the contrary, when it is not a low illuminance environment (i.e., step 103 = NO), the control device 42 skips the process of step 104 and temporarily ends this routine.

[0021] For example, in a situation where the vehicle V is parked at night or in a dark place and the power of the host vehicle V is off (i.e., the ignition switch is off), there is a requirement to operate the in-vehicle imaging device 4, which is a drive recorder, as a countermeasure against vehicle vandalism or hit-and-run. In such a situation, since the lamps such as the headlight of the host vehicle V are not lit, it is assumed that the brightness in the field of view of the camera 41 is extremely low compared to the situation where the power of the host vehicle V is on (i.e., the ignition switch is on). Here, when the subject is another vehicle, the lamps of the other vehicle are lit. On the contrary, when the subject is a person, usually, the person does not wear a light-emitting body that illuminates the face. Therefore, when performing exposure control assuming that the subject is a person, there may be a problem that the image of the license plate of the other vehicle is saturated and cannot be read.

[0022] In this regard, in the present embodiment, when a relatively small impact is applied by a person in a situation such as vandalism or car ransacking to the host vehicle V while parked, since the impact value does not exceed the threshold, imaging is performed by the high-sensitivity camera 41 corresponding to a low-illumination environment such as at night. On the other hand, when a relatively large impact is applied by another vehicle in a situation such as a collision with another vehicle, the impact value exceeds the threshold. Here, in such a situation, usually, since the lights of the other vehicle are on, if imaging is performed by the high-sensitivity camera 41 corresponding to a low-illumination environment such as at night, there is a possibility that the image of the license plate of the other vehicle becomes saturated and cannot be read. Therefore, in such a case, the present embodiment changes the exposure conditions to the lower-sensitivity side than the sensitivity corresponding to a low-illumination environment such as at night. That is, the present embodiment switches the sensitivity setting between for a person and for another vehicle. Thereby, it becomes possible to image well regardless of the subject in a low-illumination environment such as at night.

[0023] (Modification example) The present disclosure is not limited to the above-described embodiments and specific examples. Therefore, the above-described embodiments and the like can be appropriately changed. Hereinafter, typical modification examples will be described. In the description of the following modification examples, the differences from the above-described embodiments and the like will be mainly described. Also, in the above-described embodiments and the following modification examples, the same or equivalent parts are denoted by the same reference numerals. Therefore, in the description of the following modification examples, regarding the components having the same reference numerals as those in the above-described embodiments and the like, the description in the above-described embodiments and the like can be appropriately cited unless there is a technical contradiction or specific additional explanation.

[0024] The present disclosure is not limited to the specific uses and device configurations shown in the above-described embodiments. That is, for example, the host vehicle V may be a so-called automobile or a motorcycle. Also, the camera 41 may be only a front camera, may be a front camera and a rear camera, or may be an omnidirectional camera.

[0025] All or part of the control device 42 may be configured with a digital circuit, such as an ASIC or an FPGA, that can implement the functions or operations as described above. ASIC is an abbreviation for Application Specific Integrated Circuit. FPGA is an abbreviation for Field Programmable Gate Array. That is, in the control device 42, the in-vehicle microcomputer part and the digital circuit part can coexist.

[0026] The program according to the present disclosure that enables the execution of various operations, procedures, or processes described in the above embodiment can be downloaded or upgraded via V2X communication. V2X is an abbreviation for Vehicle to X. Alternatively, such a program can be downloaded or upgraded via a terminal device provided at the manufacturing factory, maintenance factory, dealership, etc. of the host vehicle V. The storage destination of such a program may be a memory card, an optical disk, a magnetic disk, etc.

[0027] As described above, each of the above functional configurations and processes may be implemented by a dedicated computer provided by configuring a processor and a memory programmed to execute one or more functions embodied by a computer program. Alternatively, each of the above functional configurations and processes may be implemented by a dedicated computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, each of the above functional configurations and processes may be implemented by one or more dedicated computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured by one or more hardware logic circuits. Further, the computer program may be stored in a non-transitory tangible storage medium readable by a computer as instructions executable by the computer. That is, each of the above functional configurations and processes may also be represented as a computer program including procedures for realizing the same, or as a non-transitory tangible storage medium storing the program.

[0028] The present disclosure is not limited to the specific operation modes shown in the above embodiments. That is, for example, the illuminance acquisition unit 421 may acquire illuminance information corresponding to the brightness around the host vehicle V based on the image information captured by the camera 41 instead of or together with the output of the illuminance sensor 32. Further, as an exposure condition, it is also possible to adjust the gain of the image sensor provided in the camera 41. In this case, the exposure control unit 423 and / or the image processing unit 424 may correspond to the component that sets the exposure condition in the present disclosure. Furthermore, the routine of FIG. 3 may be configured not only when the vehicle is parked, that is, when the ignition switch is off, but also as an exposure control routine when the ignition switch is on. In this case, a determination step regarding the on / off state of the ignition switch, the operating state of the lights on the host vehicle V, etc. may be added.

[0029] Similar expressions such as "acquisition", "calculation", "estimation", "detection", and "detection" can be appropriately replaced with each other within a technically non - conflicting range. Also, "exceeding the threshold value" and "equal to or greater than the threshold value" can be appropriately replaced with each other within a technically non - conflicting range. The same applies to "less than the threshold value" and "less than or equal to the threshold value".

[0030] It goes without saying that the elements constituting the above - described embodiments are not necessarily essential, except when explicitly stated as being particularly essential or when considered to be clearly essential in principle. Also, when numerical values such as the number of components, numerical values, quantities, ranges, etc. are mentioned, the present disclosure is not limited to that specific number, except when explicitly stated as being particularly essential or when clearly limited to a specific number in principle. Similarly, when the shape, direction, positional relationship, etc. of components, etc. are mentioned, the present disclosure is not limited to that shape, direction, positional relationship, etc., except when explicitly stated as being particularly essential or when clearly limited to a specific shape, direction, positional relationship, etc. in principle.

[0031] The modification examples are not limited to the above - mentioned examples. For example, all or part of one of the plurality of specific examples and all or part of another can be combined with each other as long as they are not technically conflicting. There is no particular limitation on the number of combinations. Similarly, all or part of one of the plurality of modification examples and all or part of another can be combined with each other as long as they are not technically conflicting. Furthermore, all or part of the above - mentioned specific examples and all or part of the above - mentioned modification examples can be combined with each other as long as they are not technically conflicting.

[0032] (Viewpoint of the disclosure) As is clear from the descriptions of the above - described embodiments and modification examples, the following disclosure matters are at least disclosed in this specification.

[0033] [Viewpoint 1 - 1] An exposure control device (42) that controls the exposure of a camera (41) mounted on a host vehicle (V), An event information acquisition unit (422) that acquires detection information of an event with respect to the host vehicle; An exposure control unit (423) that sets exposure conditions based on the acquired detection information; An exposure control device comprising the above. [Viewpoint 1-2] The event information acquisition unit acquires information corresponding to an impact value, which is the magnitude of an impact on the host vehicle, as the detection information; The exposure control unit sets the exposure conditions on the higher illuminance side than the first type of event in a second type of event where the impact value is greater than the first type of event. The exposure control device according to Viewpoint 1-1. [Viewpoint 1-3] The first type of event is the application of an impact on the host vehicle by a person; The second type of event is the application of an impact on the host vehicle by another vehicle different from the host vehicle. The exposure control device according to Viewpoint 1-2. [Viewpoint 1-4] The exposure control unit sets the exposure conditions during parking of the host vehicle in a low illuminance environment based on the acquired detection information. The exposure control device according to any one of Viewpoints 1-1 to 1-3. [Viewpoint 1-5] Applied to an in-vehicle imaging device (4) including a recording unit (43) that records a captured image by the camera. The exposure control device according to any one of Viewpoints 1-1 to 1-4.

[0034] [Viewpoint 2-1] An exposure control method for controlling the exposure of a camera (41) mounted on a host vehicle (V), the method comprising: Acquiring detection information of an event with respect to the host vehicle; Setting exposure conditions based on the acquired detection information. Exposure control method. [Viewpoint 2-2] As the detection information, acquiring information corresponding to an impact value, which is the magnitude of an impact on the host vehicle; In a second type of event where the impact value is greater than that of the first type of event, set the exposure condition on the higher illuminance side than that of the first type of event. The exposure control method according to Aspect 2-1. [Aspect 2-3] The first type of event is the application of an impact on the own vehicle by a person. The second type of event is the application of an impact on the own vehicle by another vehicle different from the own vehicle. The exposure control method according to Aspect 2-2. [Aspect 2-4] Based on the acquired detection information, set the exposure condition during parking of the own vehicle in a low illuminance environment. The exposure control method according to any one of Aspects 2-1 to 2-3. [Aspect 2-5] Applied to an in-vehicle imaging device (4) including a recording unit (43) for recording a captured image by the camera. The exposure control method according to any one of Aspects 2-1 to 2-4.

[0035] [Aspect 3-1] An exposure control program executed by an exposure control device (22) that controls the exposure of a camera (41) mounted on an own vehicle (V), The processing executed by the exposure control device includes an event information acquisition process for acquiring detection information on an event for the own vehicle, and an exposure control process for setting an exposure condition based on the acquired detection information, and the exposure control program including the above. [Aspect 3-2] In the event information acquisition process, as the detection information, acquire information corresponding to an impact value that is the magnitude of an impact on the own vehicle. In the exposure control process, in a second type of event where the impact value is greater than that of the first type of event, set the exposure condition on the higher illuminance side than that of the first type of event. The exposure control program according to Aspect 3-1. [Aspect 3-3] The first type of event is the application of an impact on the host vehicle by a person. The second type of event is the application of an impact on the host vehicle by another vehicle different from the host vehicle. The exposure control program described in Viewpoint 3-2. [Viewpoint 3-4] In the exposure control process, based on the acquired detection information, set the exposure conditions during parking of the host vehicle in a low illuminance environment. The exposure control program according to any one of Viewpoints 3-1 to 3-3. [Viewpoint 3-5] Applied to an in-vehicle imaging device (4) including a recording unit (43) that records a captured image by the camera. The exposure control program according to any one of Viewpoints 3-1 to 3-4.

Description of Signs

[0036] 31 Event detection sensor 32 Illuminance sensor 4 In-vehicle imaging device 41 Camera 42 Control device 421 Illuminance acquisition unit 422 Event information acquisition unit 423 Exposure control unit 43 Recording unit V Host vehicle

Claims

1. An exposure control device (42) for controlling the exposure of a camera (41) mounted on a host vehicle (V), comprising: an event information acquisition unit (422) that acquires detection information of an event with respect to the host vehicle; an exposure control unit (423) that sets an exposure condition based on the acquired detection information; The exposure control device provided with the above.

2. The event information acquisition unit acquires information corresponding to an impact value, which is the magnitude of an impact on the host vehicle, as the detection information, and the exposure control unit sets the exposure condition on the higher illuminance side than the first type of event in a second type of event where the impact value is greater than the first type of event. The exposure control device according to Claim 1.

3. The first type of event is the application of an impact on the host vehicle by a person, and the second type of event is the application of an impact on the host vehicle by another vehicle different from the host vehicle. The exposure control device according to Claim 2.

4. The exposure control unit sets the exposure condition during parking of the host vehicle in a low illuminance environment based on the acquired detection information. The exposure control device according to any one of Claims 1 to 3.

5. Applied to an in-vehicle imaging device (4) including a recording unit (43) that records a captured image by the camera. The exposure control device according to Claim 1.

6. An exposure control method for controlling the exposure of a camera (41) mounted on a host vehicle (V), comprising: acquiring detection information of an event with respect to the host vehicle; setting an exposure condition based on the acquired detection information. The exposure control method.

7. As the detection information, information corresponding to an impact value, which is the magnitude of an impact on the host vehicle, is acquired, and the exposure condition is set on the higher illuminance side than the first type of event in a second type of event where the impact value is greater than the first type of event. The exposure control method according to Claim 6.

8. The first type of event is the application of an impact on the host vehicle by a person, and the second type of event is the application of an impact on the host vehicle by another vehicle different from the host vehicle. The exposure control method according to Claim 7.

9. Based on the acquired detection information, the exposure condition during parking of the host vehicle in a low illuminance environment is set. The exposure control method according to any one of Claims 6 to 8.

10. Applied to an in-vehicle imaging device (4) including a recording unit (43) that records a captured image by the camera. The exposure control method according to Claim 6.

11. An exposure control program executed by an exposure control device (22) that controls the exposure of a camera (41) mounted on a host vehicle (V), The process executed by the exposure control device is an event information acquisition process for acquiring detection information of an event with respect to the host vehicle, an exposure control process for setting an exposure condition based on the acquired detection information, An exposure control program including

12. In the event information acquisition process, as the detection information, information corresponding to an impact value, which is the magnitude of an impact on the host vehicle, is acquired, In the exposure control process, in a second type of event in which the impact value is greater than a first type of event, the exposure condition is set to a higher illuminance side than the first type of event, The exposure control program according to claim 11.

13. The first type of event is the application of an impact on the host vehicle by a person, The second type of event is the application of an impact on the host vehicle by another vehicle different from the host vehicle, The exposure control program according to claim 12.

14. In the exposure control process, based on the acquired detection information, the exposure condition during parking of the host vehicle in a low illuminance environment is set, The exposure control program according to any one of claims 11 to 13.

15. Applied to an in-vehicle imaging device (4) including a recording unit (43) that records a captured image by the camera, The exposure control program according to claim 11.

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