JP2018056637A - Imaging device, control method for the same and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can suppress power consumptions when irradiating imaging auxiliary light on a photogenic subject so that the subject has proper luminance during recording a moving image for a predetermined time before an instruction for imaging a static image is made.SOLUTION: An imaging device (a camera 100) comprises recording means 101 that is controlled to record moving image data in a recording medium 141 for a predetermined time before an instruction for imaging a static image by instructing means 102 is made, out of moving image data memorized temporarily in a memory 104, in response to input of the instruction for imaging the static image by the instructing means. Light emission control means 101 and 180, before imaging means 110 images a moving image, controls a light emitting unit 170 so that the light emitting unit emits continuously light, if degrees of a shake detected by shake detecting means 160 is at a predetermined value or below.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an imaging apparatus such as a digital camera, and more particularly to a control technique for an imaging apparatus that records moving image data before an instruction to capture a still image.

  In an imaging apparatus such as a digital camera, moving image data is acquired and recorded in a memory before inputting a still image shooting instruction by a user or the like. Some have a function of recording moving image data from a certain point in time. However, in such an imaging apparatus, moving image data is recorded as it is for a predetermined time even when the shooting direction changes greatly before a still image shooting instruction is input. Therefore, a technique has been proposed in which information on the shooting direction is acquired, the amount of change in the shooting direction before the instruction to shoot a still image is calculated, and moving image data is recorded from when the change amount is equal to or less than a predetermined value. (Patent Document 1).

JP 2013-135416 A

  However, in the above-mentioned Patent Document 1, moving image data such as when the focus is not achieved or when the exposure is not appropriate is recorded.

  For example, if the subject is out of focus in an environment where there is insufficient outside light, shooting assistance light is emitted to the subject before a still image shooting instruction is given. Both the state of being irradiated and the state of not being irradiated are recorded.

  In addition, if the exposure is not appropriate in an environment where there is insufficient outside light, still images can be recorded with appropriate exposure by sensitization or strobe light, while movies for a predetermined time are recorded with underexposure. The

  In order not to record such a video that is not intended by the user, controlling the subject to have proper brightness by torch light emission that always turns on the light increases the power consumption of the imaging device, and the battery runs out in a short time. I will invite you.

  Therefore, the present invention provides a technique for reducing power consumption when continuously illuminating a subject with auxiliary shooting light so that the subject has an appropriate brightness during recording of a moving image for a predetermined time before an instruction to shoot a still image. The purpose is to do.

  In order to achieve the above object, an imaging apparatus according to the present invention includes an instruction unit that instructs to capture a still image by the imaging unit, and a light emission control unit that controls a light emitting unit that emits light toward a subject as photographing auxiliary light. A shake detection unit that detects a shake of the imaging device, a storage unit that temporarily stores moving image data captured by the imaging unit in a memory, and a still image shooting instruction from the instruction unit And recording means for controlling to record, on a recording medium, moving image data for a predetermined time before inputting a still image shooting instruction among the moving image data temporarily stored in the memory. The light emission control unit controls the light emitting unit to continuously emit light when the degree of shake detected by the shake detection unit is equal to or less than a predetermined value before the moving image is captured by the imaging unit. Characterized in that it.

  According to the present invention, it is possible to suppress the power consumption when continuously illuminating the subject with the auxiliary shooting light so that the subject has the proper luminance during the recording of the moving image for a predetermined time before the instruction to shoot the still image. .

1 is a block diagram illustrating a system configuration of a digital camera that is an example of an embodiment of an imaging apparatus of the present invention. It is a flowchart figure explaining operation | movement of a digital camera when a movie digest mode is set. It is a graph which shows the shake signal which is a composite wave from a shake detection part, and the approximate single frequency of 1 Hz, respectively. It is a figure explaining the detection method of the degree of shake of a digital camera by a shake detection part. It is a figure explaining the detection method of the degree of shake of a digital camera by a shake detection part.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a system configuration of a digital camera which is an example of an embodiment of an imaging apparatus of the present invention.

  As shown in FIG. 1, a digital camera 100 (hereinafter referred to as camera 100) according to the present embodiment includes a control unit 101. The control unit 101 includes, for example, a CPU (MPU), a memory (DRAM, SRAM), a ROM, and the like, and controls each block by executing various programs according to operation signals from the operation unit 102 based on user operations. Or control data transfer between each block.

  The operation unit 102 includes switches for inputting various operations related to shooting such as a power button, a still image shooting instruction button, a moving image recording button, a zoom adjustment button, and an autofocus button. The operation unit 102 includes a menu display button, a determination button, other cursor keys, a pointing device, a touch panel, and the like, and transmits an operation signal to the control unit 101 when these keys and buttons are operated by the user.

  The bus 103 is a general-purpose bus for sending various data, control signals, instruction signals, and the like to each block of the camera 100. The imaging unit 110 controls the amount of light of an optical image of a subject captured by a lens (not shown) by an aperture, photoelectrically converts it to an image signal by an imaging element such as a CCD sensor or a CMOS sensor, and performs analog / digital conversion. To the memory 104 for temporary storage.

  The image processing unit 111 executes processing necessary for image recording / playback, and is a microcomputer equipped with a program for executing the following processing. Note that the image processing unit 111 may execute the following processing as a partial function of the control unit 101. The image processing unit 111 obtains a white balance, color, brightness, and the like for the digital image signal acquired by the imaging unit 110 and stored in the memory 104, and a setting value determined from a setting value set by the user or image characteristics. An image quality adjustment process for adjusting based on the image quality is performed.

  The image processing unit 111 performs processing for generating moving image data from image signals of a plurality of frames subjected to image quality adjustment processing. Here, in this embodiment, the image processing unit 111 may generate moving image data that is compression-encoded by intra-frame encoding each frame of moving image data, or between a plurality of frames of moving image data. You may produce | generate the moving image data compression-coded using a difference, motion prediction, etc. For example, Motion JPEG, MPEG, H.264. H.264 (MPEG4-Part10 AVC) and other known compression and encoding video data can be generated.

  In general, frame image data that is intra-frame encoded is called an I picture, and image data that is inter-frame encoded using a difference from the preceding frame is called a P picture. In addition, image data that is inter-frame encoded using a difference between the front and rear frames is called a B picture.

  Further, the image processing unit 111 can execute processing for generating still image data from the image signal subjected to the image quality adjustment processing. When generating still image data, a general compression encoding method such as JPEG is used. The still image data may be so-called RAW image data in which the digital image signal obtained by the imaging unit 110 is recorded as it is.

  The moving image data and still image data generated by the image processing unit 111 are stored in an area other than the area where the digital image signal is stored in the memory 104. In the present embodiment, the digital image signal obtained by the imaging unit 110 and the moving image data and still image data generated by the image processing unit 111 are described as being stored in the same memory 104. It may be a memory.

  The audio input unit 120 collects (collects) sound around the camera 100 using, for example, a built-in omnidirectional microphone or an external microphone connected via an audio input terminal, and acquires the acquired analog audio signal. Is digitally converted, transmitted to the memory 104, and temporarily stored.

  The sound processing unit 121 executes a process necessary for recording and reproducing sound, and is a microcomputer equipped with a program for executing the following process. Note that the voice processing unit 121 may execute the following processing as a partial function of the control unit 101. The audio processing unit 121 performs processing such as level optimization processing and noise reduction processing on the digital audio signal acquired by the audio input unit 120 and stored in the memory 104.

  In addition, the audio processing unit 121 performs a process of compressing the audio signal as necessary. As the audio compression method, a known general audio compression method such as AC3 or AAC is used. The audio data generated by the audio processing unit 121 is stored in the memory 104 again.

  The display control unit 131 is a microcomputer that performs display control for displaying an image on the display unit 130. The display control unit 131 reads a digital image signal temporarily stored in the memory 104 and displays the digital image signal on the display unit 130. The display unit 130 may be, for example, a liquid crystal panel or an organic EL panel mounted on the camera 100, or may be a display device (for example, a television, a monitor, or a projector) different from the camera 100.

  Then, for example, the control unit 101 reads out moving image data, audio data, and the like stored in the memory 104 and transfers them to the recording / reproducing unit 140, and the recording / reproducing unit 140 transfers the transferred moving image data and audio data to the recording medium 141. To record. The recording / playback unit 140 records the moving image data and the audio data on the recording medium 141 as one moving image file.

  At this time, the control unit 101 may generate various data indicating camera settings at the time of shooting, detection data, and the like, and may record the data together with the moving image data and audio data on the recording medium 141. Here, the recording medium 141 may be a recording medium built in the imaging apparatus or a removable recording medium. For example, the recording medium includes all types of recording media such as a hard disk, an optical disk, a magneto-optical disk, a CD-R, a DVD-R, a magnetic tape, a nonvolatile semiconductor memory, and a flash memory.

  When recording a still image file, the control unit 101 reads out the still image data stored in the memory 104 and transfers it to the recording / playback unit 140. The recording / playback unit 140 transfers the still image data transferred to the recording / playback unit 140. Is recorded on the recording medium 141 as a still image file.

  The recording / playback unit 140 reads (plays back) a moving image file or the like recorded on the recording medium 141. Then, the control unit 101 reads, for example, header information of a moving image included in the read moving image file, and based on the header information, the recording / reproducing unit 140 reads the moving image data and audio data to be reproduced from the recording medium 141. Control.

  The recording / reproducing unit 140 transfers the read moving image data to the image processing unit 111 and transfers the reproduced audio data to the audio processing unit 121. The image processing unit 111 sequentially stores one frame image of the reproduced moving image data in the memory 104. Then, the display control unit 131 sequentially reads out one frame image stored in the memory 104 and displays it on the display unit 130.

  On the other hand, the audio processing unit 121 decodes a digital audio signal from the reproduced audio data, converts it into an analog signal, and outputs the analog audio signal to an audio output unit (speaker, earphone terminal, audio output terminal, etc.) not shown. . When reproducing a still image, the recording / reproducing unit 140 reads (reproduces) a still image file or the like recorded on the recording medium 141. Then, the control unit 101 transmits still image data included in the read still image file to the image processing unit 111, and the image processing unit 111 stores an image of the still image data in the memory 104. Then, the display control unit 131 sequentially reads out one frame image stored in the memory 104 and displays it on the display unit 130.

  The output unit 150 is an audio terminal or a video terminal that outputs an image signal or an audio signal to an external device. The communication unit 151 transmits and receives data to and from an external device, and can be connected regardless of wired connection or wireless connection. The shake detection unit 160 is shake detection means for outputting the degree of shake of the camera 100 as an electrical signal. For example, the shake detection unit 160 uses an angular velocity sensor, vibrates a vibration material such as a piezoelectric element at a constant frequency, converts a force due to Coriolis force generated by a rotational motion component into a voltage, obtains angular velocity information, and shakes. The degree of is calculated.

  The light emitting unit 170 is light emitting means for irradiating the subject as photographing auxiliary light. For example, the light emitting unit 170 continuously emits (lights) the LED and uses it as a torch light. The current control unit 180 is a light emission control means for controlling the light emission current value for the light emitting unit 170.

  Next, the operation of the camera 100 configured as described above will be described. When the user operates the power button of the operation unit 102, a start instruction is issued from the operation unit 102 to the control unit 101. Upon receiving this instruction, the control unit 101 controls a power supply unit (not shown) to supply power to each block of the camera 100.

  When power is supplied, the control unit 101 is in any mode such as “still image shooting mode”, “moving image shooting mode”, “playback mode”, “movie digest mode”, etc. Is confirmed by an instruction signal from the operation unit 102.

  In the “still image shooting mode”, the control unit 101 shoots when the user operates the still image recording button of the operation unit 102 in the shooting standby state, records a still image file on the recording medium 141, and again waits for shooting. It becomes a state.

  In the “moving image shooting mode”, the control unit 101 starts shooting when the user operates the moving image recording start button of the operation unit 102 in a shooting standby state. During that time, the control unit 101 records moving image data and audio data on the recording medium 141. To do. Then, the control unit 101 terminates shooting when the user operates the moving image recording end button of the operation unit 102, and completes the moving image data and audio data recorded in the recording medium 141 as a moving image file. After that, the shooting standby state is entered again.

  In the “reproduction mode”, the control unit 101 reproduces a still image file or a moving image file related to the file selected by the user from the recording medium 141, and outputs a still image, a moving image, and a sound. The “movie digest mode” will be described later with reference to FIG. Movie digest refers to a point in time when a moving image is acquired and recorded in the memory 104 before a still image shooting instruction is input by a user, etc. A function to record video data from.

  FIG. 2 is a flowchart for explaining the operation of the camera 100 when the movie digest mode is set. 2 is executed by the CPU after the program stored in the ROM or the like of the control unit 101 is expanded in the RAM.

  In FIG. 2, in step S201, when the movie digest mode is set by a user operation on the operation unit 102, the control unit 101 compares the external light (steady light) luminance value captured by the lens with the appropriate luminance value. Then, it is determined whether or not photographing auxiliary light is necessary.

  Here, a method of comparing the external light (steady light) luminance value with the appropriate luminance value will be described. First, the control unit 101 obtains a photometric value by calculation from data obtained by processing an image signal generated by receiving reflected light of a main subject. The photometric value obtained here is the external light (stationary light) luminance value. The difference between the external light (steady light) luminance value and the appropriate luminance value is obtained from the following equation (1).

ΔＥｖ：外光（定常光）輝度値と適正輝度値の差
ＹＤＬ：外光（定常光）輝度値
Ｙｒｅｆ：適正輝度値
Ｋａ：露出補正係数
Ｋｂ：感度補正係数

ΔEv: difference between external light (steady light) luminance value and appropriate luminance value YDL: external light (steady light) luminance value Yref: appropriate luminance value Ka: exposure correction coefficient Kb: sensitivity correction coefficient

  Then, the control unit 101 determines whether or not photographing auxiliary light is necessary by comparing the difference ΔEv between the external light (steady light) luminance value obtained in this way and the appropriate luminance value with a predetermined threshold value. If auxiliary light is required, the process proceeds to step S202, and if not required, the process proceeds to step S205.

  In step S202, the control unit 101 detects the degree of shake of the camera 100 by the shake detection unit 160, and proceeds to step S203.

  Here, a method of detecting the degree of shake of the camera 100 by the shake detection unit 160 will be described. In this embodiment, an angular velocity sensor is used to detect the degree of shake of the camera 100, and the degree of camera shake at the time of shooting is obtained as angular velocity information. Therefore, the detected shake signal is represented by the following equations (2) and (3), where y is the angular velocity [deg / sec] and t is the time [sec].

  Here, it is known that the vibration signal which is a composite wave tends to have the largest amplitude in a low band of about 1 Hz to 10 Hz, and ai in the above equation (3) is a wave of the composite wave at time i. High price. In the present embodiment, a shake signal that is a composite wave is considered to be approximated to a single frequency of 1 Hz including the maximum amplitude.

  FIG. 3 is a graph showing a shake signal that is a composite wave from the shake detection unit 160 and an approximate single frequency of 1 Hz. 4 and 5 are diagrams illustrating a method of detecting the degree of shake of the camera 100 by the shake detection unit 160. FIG.

  FIG. 4B shows a state in which the light emitted from the virtual point light source passes through the center of the lens and enters the imaging surface of the imaging device perpendicularly. In FIG. 4B, the focal length is D0, and p is the point at which the light emitted from the virtual point light source on the image sensor converges most strongly.

  4 (a) and 4 (c) show light emitted from a virtual point light source with an inclination of an angle α with respect to a center line that passes through the center of the lens and is perpendicular to the imaging surface of the imaging device. A state when the light passes through the center of the lens and enters the image sensor is shown. In FIG. 4A and FIG. 4C, the points at which the light emitted from the virtual point light source converges most strongly on the image sensor are denoted by r and q, respectively. In addition, the angle α is the largest amplitude angle at the approximate single frequency of 1 Hz. When the peak value of the approximate single frequency at 1 Hz is A, the angle α is expressed as a time integral value as in the following equation (4). Can do.

  Also, assuming that the focal length from the lens to the image sensor is D0, the points q and r where the light emitted from the virtual point light source converges most strongly on the image sensor described above are points as shown in FIG. They are on the same circumference centered on p. The radius ΔD (t) at that time can be obtained by the following equation (5).

  This ΔD (t) is a circle of confusion where the point at which the light emitted from the virtual point light source converges most strongly is imaged on the image sensor when the camera 100 is swinging at an approximate single frequency of 1 Hz. Radius. In this way, the degree of shake ΔD (t) is detected from the shake signal. A camera that performs shake correction according to the degree of shake is generally known, but in this embodiment, the presence or absence of shake correction means does not matter.

  For example, even when a shift lens (not shown) is used for optical camera shake correction, the shift lens drive range is determined by a mechanical limit or a limit due to optical performance. Therefore, the value of the degree of shake of the camera 100 detected in step S202 may be a value before shake correction or a value after shake correction.

  Returning to FIG. 2, in step S203, the control unit 101 determines whether or not the degree of shake of the camera 100 detected in step S202 is equal to or less than a predetermined value. If it is equal to or less than the predetermined value, the process proceeds to step S204. If the predetermined value is exceeded, the process proceeds to step S205.

  Here, assuming that the pixel pitch of the image sensor is Ds and n is an arbitrary coefficient (real number), the radius of the circle of confusion when the shake degree ΔD (t) falls within a predetermined range can be defined as nDs. Therefore, the degree of shake of the camera 100 is determined by comparing the degree of shake ΔD (t) with nDs to determine whether or not the radius of the circle of confusion formed on the image sensor is within a predetermined range. Is determined to be less than or equal to a predetermined value. Note that nDs may be defined by at least one coefficient n, and the degree of shake ΔD (t) may be compared with a plurality of different predetermined values (n0Ds to nmDs (m is an integer)).

  In step S204, the control unit 101 performs torch light emission control by energizing the light emitting unit 170 by the current control unit 180, and proceeds to step S206. Specifically, the control unit 101 refers to a look-up table of the light emission amount and light emission current value of the light emitting unit 170 recorded in advance in the memory 104, and emits light corresponding to ΔEv calculated by the above equation (1). The current value ILED is determined. Then, the control unit 101 energizes the light emitting unit 170 by the current control unit 180 with the determined light emission current value ILED.

  In step S203, when the shake degree ΔD (t) detected in step S202 is compared with a plurality of different predetermined values (n0Ds to nmDs (m is an integer)), the light emission current value is set according to the predetermined value. You can decide. In this case, for example, when the degree of shake ΔD (t) is the smallest (ΔD (t) = n0Ds), the emission current value ILED corresponding to ΔEv is used, and when the degree of shake ΔD (t) is large (ΔD (t) ) = NmDs) is a light emission current value kILED (0 <k <1). In step S205, the control unit 101 proceeds to step S206 without performing torch light emission control.

  In step S206, the control unit 101 temporarily stores the digital image signal obtained by the imaging unit 110 in the memory 104, reads out the digital image signal stored in the memory 104 by the display control unit 131, and displays the display unit 130. To display. In addition, the control unit 101 uses the image processing unit 111 to sequentially read the digital image signals stored in the memory 104 and perform encoding processing for generating moving image data, and the process proceeds to step S207. At this time, after applying various adjustment processes to the input digital audio signal by the audio processing unit 121, the control unit 101 performs an encoding process according to a preset audio encoding method.

  In step S207, the control unit 101 stores the encoded moving image data and audio data in the memory 104 by the image processing unit 111 and the audio processing unit 121, and proceeds to step S208. In the following description, for the sake of convenience, audio data processing is omitted, but it is assumed that it is processed together with moving image data.

  In step S208, the control unit 101 determines whether or not moving image data for a predetermined time or longer is stored in the memory 104. If moving image data for a predetermined time or longer is stored in the memory 104, the process proceeds to step S209. Otherwise, the process returns to step S201. In step S209, the control unit 101 deletes moving image data captured at a time point earlier than the predetermined time, and proceeds to step S210.

  In the present embodiment, the moving image data stored in the memory 104 is captured before the predetermined time so that the moving image data for the predetermined time immediately before is always stored in the memory 104. Deleted video data. The predetermined time may be an arbitrary time, but may be selected by the user, for example, 4 seconds, 6 seconds, 8 seconds, or the like.

  In the present embodiment, it is assumed that moving image data for a predetermined time immediately before is always stored in the memory 104, but the present invention is not limited to this. That is, the size of the moving image data stored in the memory 104 is not limited as long as it can be quantified, and is a predetermined amount defined by, for example, the number of frames, the number of GOPs (Group Of Pictures), the data size, and the like. Good. In other words, when the moving image data stored in the memory 104 becomes larger than a predetermined size when the size of the moving image data is equal to or larger than the predetermined size, the shooting time of the frames of the moving image data is reduced until the moving image data becomes smaller than the size. You may make it delete in order from an old frame.

  In step S210, the control unit 101 determines whether a still image shooting instruction has been input from the operation unit 102. If a still image shooting instruction has been input, the process proceeds to step S211. Returns to step S201.

  Here, when a still image shooting instruction is input, the control unit 101 controls the recording / playback unit 140 to check the recordable capacity of the recording medium 141, and the moving image temporarily stored in the memory 104. It may be determined whether or not data can be recorded.

  This determination is made by comparing whether or not the sum of the size of the moving image data temporarily stored in the memory 104 and the expected size of the still image data to be recorded is smaller than the recordable capacity of the recording medium 141. Is determined. The expected size of the still image data to be recorded may be 4 MB, for example, or may be changed according to the recording size, image quality, or the like. If it is determined that the moving image data and still image data cannot be recorded on the recording medium 141, only still image shooting may be performed and the moving image data may not be recorded.

  Further, when a still image shooting instruction is input, if only moving image data for a short time such as less than 1 second or less than 2 seconds is stored in the memory 104, the still image shooting instruction is invalidated. You may make it do. This time may be set by the user.

  In step S211, the control unit 101 performs a still image data shooting operation using the imaging unit 110, and the process proceeds to step S212. In step S212, the control unit 101 causes the image processing unit 111 to decode the first frame image of the moving image data stored in the memory 104, generates a thumbnail image, and proceeds to step S213. In this embodiment, the thumbnail image of the moving image data to be recorded is generated from the image of the first frame. However, the present invention is not limited to this, and is generated from the image of one of the frames of the moving image data to be recorded. May be.

  That is, when a still image shooting instruction is given, a thumbnail image using any frame of the moving image data stored in the memory 104 may be generated. As a result, the thumbnail image of the moving image data can be generated without reading the moving image file from the recording medium 141 after the file recording of the moving image data to the recording medium 141 is completed once, and the processing becomes faster. If it is determined that a still image shooting instruction has been issued, the control unit 101 performs control so that the instruction is not accepted even if a still image shooting instruction is issued.

  In step S213, the control unit 101 determines whether or not the thumbnail image generation process by the image processing unit 111 is completed. If the process is completed, the process proceeds to step S214. In step S214, the control unit 101 causes the image processing unit 111 to sequentially execute development processing and encoding processing so that the digital image signal captured in step S211 becomes still image data, and the process proceeds to step S215.

  Here, the still image development process is a "demosaic" process that creates a full-color image by complementing the color information by collecting and providing insufficient color information from the surrounding pixels to each pixel of the image sensor during shooting. The process including the gamma correction and the white balance adjustment may be included. Further, when the above-described development processing is completed, the control unit 101 stores the developed digital image data in the memory 104 again, causes the display control unit 131 to read the data, and causes the display unit 130 to display the digital image data.

  This is a so-called “rec review” display in which a captured image is generally displayed on the display unit 130 immediately after shooting with a digital camera. By the way, no image is displayed on the display unit 130 until a still image development process is completed after a still image shooting instruction is given, but a black image is displayed. A display for presenting a status such as “processing in progress” to the user may be displayed. When the development process is completed, the control unit 101 causes the image processing unit 111 to execute the encoding process according to a preset encoding method for still image recording.

  In step S215, the control unit 101 includes the thumbnail image generated by the thumbnail process in the header information of the encoded moving image data temporarily stored in the memory 104, and records it in the recording medium 141, and the process proceeds to step S216. .

  In step S216, the control unit 101 determines whether the still image development process and the encoding process have been completed. If it is determined that the still image encoding process has been completed, the control unit 101 proceeds to step S217. In step S217, the control unit 101 sends the generated still image data to the recording / reproducing unit 140 to record it on the recording medium 141, and the process proceeds to step S218.

  In step S218, the control unit 101 determines whether or not the user has operated the operation unit 102 to give an instruction to end shooting in the movie digest mode. If there is no instruction, the control unit 101 returns to step S201 to give an instruction. If so, the process ends.

  In this embodiment, an example in which an angular velocity sensor is used as the shake detection unit 160 has been described, but an acceleration sensor or other shake detection means may be used. Further, although the detected shake signal is calculated by approximating it to a single frequency of 1 Hz, it may be calculated directly from the composite wave. In addition, after selecting a predetermined current value that can be allowed by the LED as the light emission current value, it may be controlled to increase the ISO sensitivity setting. Further, the aperture may be controlled to open after selecting a predetermined current value that the LED can tolerate as the light emission current value.

  Whether or not to add the moving image data sequentially is determined after recording the still image and before recording the moving image data on the recording medium 141. This is because the control unit 101 reads out the moving image file last shot in the movie digest mode from the recording / playback unit 140 and confirms the date information of the shot. If the read moving image file is taken on the same day, it is added. If it is taken on a different day, it is not added. Whether or not to add data may be confirmed when the camera 100 is activated or when the mode is switched to the movie digest mode.

  A moving image shot in the movie digest mode is, for example, a file name obtained by sequentially incrementing a 4-digit integer in an identifier “MDG” for indicating that the moving image is shot in the movie digest mode. By doing in this way, it can be easily identified that the moving image having the largest number including the identifier MDG recorded on the recording medium 141 is the one shot last.

  In addition, the thumbnail image is generated every time a still image shooting instruction is input. In this case, a plurality of thumbnail images are associated with the added moving image file. However, in the case of additional recording, a thumbnail image may be generated only when a moving image file is newly generated without generating a thumbnail image.

  As described above, in the present embodiment, in the movie digest mode, torch light emission control is performed only when the amount of camera 100 blur is equal to or less than a predetermined value during moving image shooting with a movie digest when the ambient light luminance is equal to or less than a predetermined value. . For this reason, it is possible to accurately predict the shooting timing of a still image, and to record a subject without wastefully consuming battery power with long-time torch light emission control during recording of a predetermined time before a still image shooting instruction. It is possible to record moving image data that has an appropriate luminance.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  The present invention can also be realized by executing the following processing. That is, the present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in the computer of the system or apparatus read the program. It can also be realized by processing to be executed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

DESCRIPTION OF SYMBOLS 100 Camera 101 Control part 102 Operation part 104 Memory 110 Image pick-up part 111 Image processing part 160 Shake detection part 170 Light emission part 180 Current control part

Claims (4)

Instruction means for instructing to take a still image by the imaging means;
Light emission control means for controlling a light emitting unit that emits light toward the subject as photographing auxiliary light;
Shake detection means for detecting shake of the imaging device;
Storage means for temporarily storing the moving image data imaged by the imaging means in a memory;
The moving image data for a predetermined time before the input of the still image shooting instruction among the moving image data temporarily stored in the memory in response to the input of the still image shooting instruction by the instruction means Recording means for controlling to record on a recording medium,
The light emission control unit controls the light emitting unit to continuously emit light when the degree of shake detected by the shake detection unit is a predetermined value or less before the moving image is captured by the imaging unit. An imaging apparatus characterized by the above.   The degree of shake detected by the shake detection means is compared with a plurality of different predetermined values. When the degree of shake exceeds a small value and is less than or equal to a large value, the light emission is greater than when the degree of shake is less than a small value. The imaging apparatus according to claim 1, wherein a current value for the unit is controlled to be small. An instruction step for instructing photographing of a still image by the imaging means;
A light emission control step for controlling a light emitting unit that emits light toward a subject as photographing auxiliary light;
A shake detection step for detecting shake of the imaging device;
A storage step of temporarily storing moving image data imaged by the imaging means in a memory;
The moving image data for a predetermined time before the input of the still image shooting instruction among the moving image data temporarily stored in the memory in response to the input of the still image shooting instruction in the instruction step And a recording step for controlling to record on the recording medium,
The light emission control step controls the light emitting unit to continuously emit light when the degree of shake detected in the shake detection step is equal to or less than a predetermined value before capturing a moving image by the imaging unit. A method for controlling an image pickup apparatus.   A program for causing a computer to execute each step of the control method for an imaging apparatus according to claim 3.

Images