JP5159589B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus capable of selecting a moving image shooting mode and a still image shooting mode.

  In recent years, the number of digital video cameras capable of capturing still images and digital still cameras capable of capturing moving images has increased, and the barrier between the digital video camera and the digital still camera has been lowered. FIG. 2 shows an external perspective view seen from the back of the imaging device capable of shooting both moving images and still images, and FIG. 3 shows an external perspective view seen from the front. A moving image recording button for instructing start and stop of recording of a moving image and a shutter button for instructing recording of a still image are provided. In general, the aspect ratio of a moving image is often 16: 9 for both high definition (HD: High Definition) image quality and standard (SD: Standard Definition) image quality. On the other hand, the aspect ratio of still images is often 4: 3.

  There is a camera in which an image signal reading area of an image pickup device such as a CCD sensor or a CMOS sensor is differentiated between moving image shooting and still image shooting. FIG. 4A shows an example of a read area at the time of still image shooting, and FIG. 4B shows an example of a read area at the time of moving image shooting. An area having an aspect ratio of 4: 3 is read out from an area excluding an OB (optical black) area where no light is irradiated on the imaging surface of the imaging element. An area having an aspect ratio of 16: 9 is read out during moving image shooting. In the example shown in FIG. 4, the still image is read from a larger area than the moving image. In such an imaging apparatus, at the time of moving image shooting, a still image using the same readout area as the moving image can be shot (recorded), but still image shooting with the original maximum pixel cannot be performed.

In addition to the readout area, the optimal processing for movie shooting and the optimal processing for still image shooting are generally different, so depending on the switching between the movie shooting mode for shooting movies and the still image shooting mode for shooting still images There are also digital video cameras that switch image processing contents. 2 and 3, when shooting a moving image, the shooting mode switching dial is set to the “MOVIE” side to switch to the moving image shooting mode, and then the moving image recording button is pressed. When shooting a still image, set the shooting mode switching dial to the “STILL” side to switch to the still image shooting mode, and then press the shutter button.

When a shutter button is pressed in the moving image shooting mode, there is a camera that switches from the moving image shooting mode to the still image shooting mode in conjunction with the operation and performs shooting in the still image shooting mode (Patent Documents 1 and 2). . The shutter button is a switch that can detect two steps of half-press and full-press. When the shutter button is pressed halfway, the mode is switched to the still image shooting mode and the subject is focused, and then the shutter button is fully pressed to record the still image. Some return to the moving image shooting mode immediately after the recording of the still image is completed, and others can hold the still image shooting mode for a certain period and take a still image again. Thereby, the shooting mode switching operation can be omitted.
JP 2003-348433 A Japanese Patent Laying-Open No. 2005-077984

  Even in an imaging device that switches from the moving image shooting mode to the still image shooting mode temporarily or for a certain period by operating the shutter button during the moving image shooting mode, the zoom magnification or the like cannot be changed in the still image shooting mode.

  An object of this invention is to show the imaging device which eliminates such an inconvenience.

An imaging apparatus according to the present invention is an imaging apparatus capable of executing a moving image shooting mode and a still image shooting mode, wherein a moving image shooting instruction unit, a still image shooting instruction unit, a shooting parameter operation unit, and the execution of the moving image shooting mode are performed. during the switch to the still image shooting mode according to the operation of the still image shooting instruction means, passed control to switch to the moving image shooting mode according to the still image shooting instruction means and the no-operation period is not operated the imaging parameter operating means And the no-operation period is restarted by an operation of either the still image shooting instruction unit or the shooting parameter operation unit.

  According to the present invention, since the shooting mode is not switched while the shooting parameter changing operation is being performed, the shooting parameter changing operation can be performed while the same shooting mode is maintained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a schematic block diagram of an embodiment of the present invention. The imaging apparatus 10 of this embodiment includes a photographing lens 12 having a zoom function, a focus adjustment function, and an exposure adjustment function. The photographing lens 12 makes an optical image of a subject incident on the image sensor 14, and the image sensor 14 converts the optical image into an electrical image signal. The imaging element 14 is an element in which photoelectric conversion elements from a CCD sensor, a CMOS sensor, or the like are arranged on a two-dimensional plane. The system control circuit 24 can switch the reading range of the image sensor 14 according to the operation mode.

  The output image number of the image sensor 14 is supplied to the moving image recording processing circuit 18 or the still image recording processing circuit 20 by the switch 16. The moving image recording processing circuit 18 includes a camera signal processing circuit that converts an image signal from the image sensor 14 into a video signal of a predetermined format, and a moving image encoding circuit that compresses and encodes the video signal motion. MPEG2 and H.264 are used for video compression encoding systems. H.264. The still image recording processing circuit 20 includes a still image encoding circuit that compresses and encodes an image signal from the image sensor 14 as a still image. There is JPEG as a still image compression encoding method.

  In the moving image shooting mode, the system control circuit 24 connects the switch 16 to the moving image recording processing circuit 18 and sets the reading range of the image sensor 14 to that for moving images. In the still image shooting mode, the system control circuit 24 connects the switch 16 to the still image recording processing circuit 20 and sets the reading range of the image sensor 14 to that for still images. Thus, in the moving image shooting mode, the image signal read from the moving image reading range of the image sensor 14 is recorded by the moving image recording processing circuit 18 and recorded on the recording medium 22. In the still image shooting mode, the image signal read from the still image reading range of the image sensor 14 is recorded by the still image recording processing circuit 20 and recorded on the recording medium 22. In both the moving image shooting mode and the still image shooting mode, the setting of the readout range of the image sensor 14 includes control of the aspect ratio.

  The operation unit 26 includes a shooting mode switching dial, a moving image recording / stop button for instructing operation shooting, a shutter button for instructing recording of a still image, a zoom lever, and a general-purpose switch including a cross key and a determination key. The shutter button consists of a two-step switch that is half-pressed and fully pressed. When the shutter button is half-pressed, the system control circuit 24 is instructed to focus and determine the exposure, and when the shutter button is fully pressed, the system control circuit 24 is instructed to shoot (record) a still image.

  The user can instruct the operation mode to the system control circuit 24 by the photographing mode switching dial of the operation unit 26, and can instruct to zoom the photographing lens 12 by the zoom lever. In the auto focus mode, the system control circuit 24 automatically adjusts the focus of the taking lens 12 by a known means. In the manual focus mode, the system control circuit 24 moves the focus of the photographing lens 12 based on the operation of the operation unit 26 focus adjustment ring. The display unit 28 can display shooting conditions and shooting parameters.

  The display content of the display unit 28 is optimized according to the moving image shooting mode or the still image shooting mode. For example, in the moving image shooting mode, information necessary for moving image shooting (such as a recording mode and a recordable time) is displayed, and other unnecessary information (such as a still image size and the number of recordable images) is not displayed. In addition, only menus necessary for moving images are displayed as menus for camera settings. On the other hand, in the still shooting mode, information (still image size, recordable number, etc.) necessary for still image shooting is displayed, and other unnecessary information (recording mode, recordable time, etc.) is hidden. The menu for setting the camera also displays only those necessary for still images.

  General-purpose operation buttons may be used for focus adjustment or zoom operation. For example, the up / down buttons or left / right buttons of the cross button are assigned to the zoom side at the tele side / wide side, the focus position at the NEAR side / FAR side, etc., or the aperture value increase / decrease, respectively.

  Imaging parameters include parameters for image quality adjustment including white balance in addition to lens parameters. Such image quality adjustment parameters often do not have adjustment-specific operation members, but parameter values can be changed by assigning them to a cross button or using a touch panel. The system control circuit 24 controls the image sensor 14, the moving image recording processing circuit 18, the still image recording processing circuit 20, and the like according to the operation of the operation unit 26 that instructs to change these parameter values.

  The moving image recording processing circuit 18 has two states, a standby state and a recording state. The moving image recording processing circuit 18 transitions to the recording state in accordance with the moving image shooting instruction from the system control circuit 24 in the standby state, and starts compression encoding and recording of the image signal from the image sensor 14 on the recording medium 22. . Conversely, the moving image recording processing circuit 18 stops compression encoding and recording in accordance with the moving image shooting instruction from the system control circuit 24 in the recording state, and returns to the standby state. That is, the moving image shooting instruction in the standby state means an instruction to start recording, and the moving image shooting instruction in the recording state means an instruction to stop recording.

  The system control circuit 24 switches the image sensor 14, the switch 16, and the still image recording processing circuit 20 to a state corresponding to still image shooting in accordance with a still image shooting mode switching instruction from the operation unit 26. That is, the readout area of the image sensor 14 is set to that for still images, the switch 16 is switched to the still image recording processing circuit 20 side, and the still image recording processing circuit 20 is made to stand by for compression encoding. Further, the system control circuit 24 controls the focus position of the photographing lens 12 to the designated position in accordance with the still image photographing focus instruction from the operation unit 26. When the focus is achieved, an icon is displayed or a sound is emitted to notify the user that the focus is achieved. When there is a still image shooting / recording instruction by the shutter button, the system control circuit 24 reads an image signal from the still image reading range of the image sensor 14 and causes the still image recording processing circuit 20 to perform compression encoding. The compression-encoded still image is recorded on the recording medium 22. In recent years, reversible compression (RAW format) is used instead of lossy compression such as JPEG, and there is recording without compression coding.

  The recording medium 22 may be a recording medium that is detachable from the imaging apparatus 10 or a recording medium that is not removable and is built in the imaging apparatus 10. As the removable recording medium, a memory card, an optical disk, or the like can be considered. Further, as a non-detachable recording medium, a flash memory, a hard disk drive, or the like can be considered. Externally connected hard disk recorders and network servers are also conceivable.

  The timer 30 is used to measure various times. In the present embodiment, the system control circuit 24 refers to the timer 30 and measures a period when there is no instruction from the operation unit 26.

  FIG. 5 shows an operation flowchart of this embodiment. With reference to FIG. 5, the characteristic operation of the present embodiment will be described.

  When the power is turned on, the imaging device 10 enters a moving image shooting mode. The system control circuit 24 determines whether there is a still image shooting instruction from the operation unit 26, and waits for a still image shooting instruction (S1). When there is a still image shooting instruction (S1), it is determined whether or not a moving image is being recorded (S2). If a moving image is being recorded (S2), since it cannot be switched to the still image shooting mode, the process returns to step S1 without doing anything. At this time, the display unit 28 may display information indicating that the mode cannot be shifted to the still image shooting mode.

  When the moving image is not being recorded (S2), the system control circuit 24 switches to the still image shooting mode (S3). That is, the system control circuit 24 switches the switch 16 to the still image recording processing circuit 20 side, sets the reading area of the image sensor 14 for still images, and puts the still image recording processing circuit 20 into a recording standby state. Further, the system control circuit 24 clears the no-operation timer value indicating the period when there is no instruction from the operation unit 26 (S4).

  Until the no-operation timer value reaches a predetermined value (S9), that is, during the no-operation period, the still image shooting mode is maintained. If there is a still image shooting operation (S5) or shooting parameter operation (S7) during the no-operation period, the system control circuit 24 clears the no-operation timer value (S4). That is, the timing of the no-operation timer period is restarted from zero.

  In the still image shooting mode, the user can take a still image with the shutter button. When the user presses the shutter button halfway, a still image shooting focus instruction is input from the operation unit 26 to the system control circuit 24. The system control circuit 24 adjusts the focus of the taking lens 12 to the subject and adjusts the aperture to an appropriate exposure according to the still image shooting focus instruction. When the shutter button is fully pressed, the system control circuit 24 causes the image sensor 14 to read an image signal from the still image readout area, and causes the still image recording processing circuit 20 to execute still image compression and recording processing.

  During still image shooting (S5), the no-operation timer value is cleared (S4). While a still image shooting focusing instruction or a still image shooting recording instruction by pressing the shutter button halfway is being input to the system control circuit 24, it is determined that still image shooting is in progress. Further, it is determined that still image shooting is being performed even during the recording operation on the recording medium 22 by the still image recording processing circuit 20. That is, during half-pressing and full-pressing of the shutter button and during recording processing on the recording medium 22 after the shutter button is released corresponds to still image shooting.

  When a moving image shooting instruction is input from the operation unit 26 during the still image shooting mode (S6), the system control circuit 24 switches to the moving image shooting mode (S10). That is, the system control circuit 24 switches the switch 16 to the moving image recording processing circuit 18 side, sets the reading area of the image sensor 14 for moving images, and starts compression and recording on the recording medium 22 by the moving image recording processing circuit 18. .

  If there is no moving image shooting instruction (S6) and the shooting parameter is operated by the operation unit 26 (S7), the process returns to step S4 and the no-operation timer value is cleared (S4).

  If there is no operation of the shooting parameter (S7), the system control circuit 24 refers to the timer 30 and adds the value corresponding to the elapsed time from the previous update to the no-operation timer value (S8). When the updated no-operation timer value is equal to or smaller than the predetermined threshold value (S9), the system control circuit 24 returns to step S5, and when it exceeds the predetermined value (S9), the system control circuit 24 switches to the moving image shooting mode (S10). In the moving image shooting mode, the system control circuit 24 switches the switch 16 to the moving image recording processing circuit 18 side, sets the reading area of the image sensor 14 for moving images, and performs compression and recording on the recording medium 22 by the moving image recording processing circuit 18. To start.

  The threshold value of the non-operation timer for still image shooting may be different from the threshold value of the non-operation timer for shooting parameter operation. FIG. 6 shows another operation flowchart of the present embodiment modified as described above. Steps S21 to S23 are the same as steps S1 to S3 in FIG.

The system control circuit 24 sets the first value as the no-operation timer value (S24). In this embodiment, as described later, the no-operation timer value is subtracted with the passage of time (S28 ) , and when it becomes zero (S30), the mode is switched to the moving image shooting mode (S31). The first value is a threshold value for a no-operation period when there is no still image shooting operation.

  During still image shooting (S25), the no-operation timer value is updated with the first value (S24). As in the case of FIG. 5, it is determined that still image shooting is in progress while a still image shooting focus instruction or a still image shooting record instruction by pressing the shutter button halfway is being input to the system control circuit 24. Further, it is determined that still image shooting is being performed even during the recording operation on the recording medium 22 by the still image recording processing circuit 20.

  When a moving image shooting instruction is input from the operation unit 26 during the still image shooting mode (S26), the system control circuit 24 switches to the moving image shooting mode (S31). In the moving image shooting mode, the system control circuit 24 switches the switch 16 to the moving image recording processing circuit 18 side, sets the reading area of the image sensor 14 for moving images, and performs compression and recording on the recording medium 22 by the moving image recording processing circuit 18. To start.

  If there is no moving image shooting instruction (S26) and the shooting parameter is operated by the operation unit 26 (S27), the second value is set to the no-operation timer value (S24), and the process returns to step S25.

  If no shooting parameter is operated (S27), the system control circuit 24 refers to the timer 30 and subtracts the value corresponding to the elapsed time from the previous update from the no-operation timer value (S28). The system control circuit 24 returns to step S25 while the updated no-operation timer value is a positive value (S30), and switches to the moving image shooting mode when it is equal to or less than zero (S30) (S31). In the moving image shooting mode, the system control circuit 24 switches the switch 16 to the moving image recording processing circuit 18 side, sets the reading area of the image sensor 14 for moving images, and performs compression and recording on the recording medium 22 by the moving image recording processing circuit 18. To start.

  In the operation flow shown in FIG. 6, the no-operation period for the shooting instruction and the no-operation period for changing the shooting parameter can be made different, and more flexible setting is possible. For example, if the shooting parameter is changed, there is a high possibility that shooting will be continued. Therefore, by setting the second value larger than the first value, the user can take a still image with a margin. In addition, when the shooting parameters are not operated, it is possible to automatically switch to the moving image shooting mode at an early stage.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications or changes can be made within the scope of the gist thereof. For example, all or part of the functions of the moving image recording processing circuit 18 and the still image recording processing circuit 20 can be implemented as a program that operates on one general-purpose microcomputer, and some program modules can be shared. .

It is a schematic block diagram of one Example of this invention. It is the external appearance perspective view seen from the back side of an imaging device. It is an external appearance perspective view of an imaging device from the front side. It is explanatory drawing of the read-out range of an image pick-up element. It is an operation | movement flowchart of a present Example. It is another operation | movement flowchart of a present Example.

Explanation of symbols

10: imaging device 12: imaging lens 14: imaging device 16: switch 18: moving image recording processing circuit 20: still image recording processing circuit 22: recording medium 24: system control circuit 26: operation unit 28: display unit 30: timer

Claims (5)

An imaging device capable of executing a video shooting mode and a still image shooting mode,
Video shooting instruction means;
A still image shooting instruction means;
Shooting parameter operation means;
During execution of the moving image shooting mode, the mode is switched to the still image shooting mode according to the operation of the still image shooting instruction means, and the non- operation period when the still image shooting instruction means and the shooting parameter operation means are not operated is elapsed. An imaging apparatus comprising: a control unit that switches to a moving image shooting mode, wherein the no-operation period is restarted by any one of the still image shooting instruction unit and the shooting parameter operation unit.   The imaging apparatus according to claim 1, wherein the imaging parameter operation unit is a unit that changes a zoom magnification.   The imaging apparatus according to claim 1, wherein the imaging parameter operation unit is a unit that changes focus.   The imaging apparatus according to claim 1, wherein the imaging parameter operation unit is a unit that changes an aperture.   5. The imaging apparatus according to claim 1, wherein the no-operation period is different for no operation of the still image shooting instruction unit and no operation of the shooting parameter operation unit. 6.

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