JP6268696B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus.

Imaging that can generate a live view image using signal charges read from an image sensor at a predetermined frame rate and display the live view image on a display member, so that the composition and the like can be confirmed before shooting. The device is known. In Patent Document 1, by performing white balance correction processing on a live view image, a live view image having the same color as that at the time of shooting can be confirmed before shooting.
(Patent Document 1).

JP-A-11-355628

  In the conventional technique, when an image effect based on the shutter speed used at the time of shooting is added to the live view image, the range of the shutter speed at which the image effect can be added is limited to the frame rate at which the signal charge is read. There was a thing.

An imaging apparatus according to the present invention generates an image by an imaging unit in which a plurality of pixels are exposed and signals are output from the plurality of pixels, and a signal output from the plurality of pixels, and an image is generated on the generated image An image generating unit capable of generating at least a recording image to be processed and recorded in the recording unit and a display image to which an image effect added to the recording image is added; and generating the display image In addition, when the image effect added to the recording image is different from the image effect due to the shutter speed, the plurality of pixels is generated by a first drive signal that instructs the start of exposure of the plurality of pixels at a predetermined frame rate. to perform the output of the signal from, if the image effect added by the image generating unit of the image effect by the shutter speed, different from the second driving signal from the first drive signal , To perform the output of the signals from the plurality of pixels, and a control unit can be set to be longer than the period of the frame rate the exposure time of the plurality of pixels.

  According to the present invention, it is possible to add an image effect to a live view image.

1 is a block diagram illustrating a circuit configuration of an imaging apparatus according to an embodiment of the present invention. It is a timing chart regarding the drive signal used for control of an image sensor. It is a functional block diagram regarding ASIC. 6 is a flowchart relating to processing for selecting a method of reading signal charges from an image sensor. It is a flowchart regarding the process performed in the imaging device by one embodiment of this invention.

  FIG. 1 is a block diagram illustrating a circuit configuration of an imaging apparatus according to an embodiment of the present invention. An electronic camera 200 illustrated in FIG. 1 includes a photographing lens 7, a diaphragm 8, a diaphragm driving unit 9, an image sensor 10, an analog signal processing circuit 11, an A / D conversion circuit 12, and an ASIC (Application Specific). Integrated Circuit) 13, driver 16, timing generator (TG) 17, CPU 18, RAM 19, ROM 20, display monitor 21, main switch 22, half-press switch 23, full-press switch 24, photometry An apparatus 25 and a recording medium 27 are provided.

  The photographing lens 7 includes a plurality of lens groups including a zoom lens and a focusing lens, and forms a subject image on the light receiving surface of the image sensor 10. In FIG. 1, the photographing lens 7 is illustrated as a single lens for the sake of simplicity. The diaphragm 8 is formed from a plurality of diaphragm blades (not shown), and adjusts the amount of light flux received by the image sensor 10. The aperture drive unit 9 drives aperture blades (not shown) based on the aperture value set by the CPU 18.

  The electronic camera 200 shown in FIG. 1 is a digital camera in which the photographing lens 7 is formed integrally with the camera (the photographing lens cannot be attached or detached). However, the configuration described later can also be applied to a camera system including a camera body and an interchangeable lens that can be attached to and detached from the camera body. In this case, among the configuration shown in FIG. 1, the photographing lens 7, the diaphragm 8, and the aperture driving unit 9 are the configuration on the interchangeable lens side, and the other configuration is the configuration on the camera body side.

  The image sensor 10 is an image sensor corresponding to the image plane phase difference AF, and has an image pickup pixel and a focus detection pixel on the image pickup surface. The imaging pixels are arranged on the imaging surface of the imaging device 10 according to, for example, a Bayer array. The focus detection pixels are arranged in place of the imaging pixels at pixel positions corresponding to the focus detection positions set in the imaging screen. A subject image is formed on the imaging surface of the imaging element 10 by the photographing lens 7. Each pixel of the image sensor 10 is exposed during the shutter speed set by the CPU 18 and signal charges corresponding to the brightness of the subject image are accumulated.

  The image sensor 10 includes an internal oscillation device 10a. The internal oscillation device 10a generates a drive signal at a predetermined frame rate. The signal charges accumulated in the image sensor 10 are read according to a drive signal output from the internal oscillation device 10a or a driver 16 described later and output to the analog signal processing circuit 11. The signal charges accumulated in the imaging pixels are used for generating a live view image and a recording image compressed in various compression formats. The signal charge accumulated in the focus detection pixel is used for phase difference detection AF.

  The analog signal processing circuit 11 includes an AGC circuit, a CDS circuit, etc., performs analog signal processing (gain control, noise removal, etc.) on the signal charge read from the image sensor 10, and outputs an image signal. The A / D conversion circuit 12 converts the imaging signal after the analog signal processing by the analog signal processing circuit 11 into a digital signal and outputs the digital signal to the ASIC 13. The analog signal processing circuit 11 and the A / D conversion circuit 12 can be formed integrally with the image sensor 10.

  The ASIC 13 uses the RAM 19 as a work area, performs image processing to be described later on the digital signal output from the A / D conversion circuit 12, and outputs a live view image, a recording image compressed in various compression formats, and the like.

  The timing generator 17 generates a timing signal under the control of the CPU 18. The timing signal is supplied to each of the analog signal processing circuit 11, the A / D conversion circuit 12, and the driver 16. The driver 16 generates a drive signal using the timing signal and outputs the drive signal to the image sensor 10.

  The CPU 18 is configured by a microcomputer or the like, and controls each part of the electronic camera 200 by executing a control program stored in the ROM 20 using the RAM 19 as a work area. The RAM 19 is a working memory that temporarily stores data when the ASIC 13, the CPU 18, and the like execute processing of each unit. The ROM 20 is a nonvolatile memory such as an EEPROM or a flash memory, and stores a control program, setting information, and the like of the electronic camera 200. The display monitor 21 is a liquid crystal monitor, for example, and displays a live view image, a menu screen, a recording image stored in a recording medium 27 described later, and the like. Display data displayed on the display monitor 21 is generated by the CPU 18.

  The main switch 22 outputs an operation signal corresponding to the on operation or the off operation to the CPU 18. The CPU 18 starts power supply to each block from a power circuit (not shown) when receiving an ON operation signal, and stops power supply from the power circuit to each block when receiving an OFF operation signal.

  The half-press switch 23 and the full-press switch 24 are turned on / off in conjunction with a pressing operation of a release button (not shown), and each outputs an operation signal to the CPU 18. The half-press switch 23 outputs a half-press signal when a release button (not shown) is pressed down to about half of the normal stroke. The half-press switch 23 cancels the output of the half-press signal by releasing the half-stroke pressing operation.

  The full push switch 24 outputs a full push signal when a release button (not shown) is pushed down to a normal stroke. The full push switch 24 releases the output of the full push signal when the normal stroke push-down operation is released.

  The photometry device 25 calculates the luminance of the subject when a half-press signal of the half-press switch 23 is input to the CPU 18. The recording medium 27 is composed of a data storage member such as a flash memory card, for example, and stores recording images and the like.

(Drive signal)
FIG. 2A is a timing chart regarding the drive signal output from the internal oscillation device 10a. In FIG. 2A, the drive signal output from the internal oscillation device 10a temporarily falls from the H level to the L level every time a time corresponding to a predetermined frame rate has elapsed. The exposure of each pixel of the image sensor 10 is started when the drive signal output from the internal oscillation device 10a falls (for example, time T1, time T2), and is ended after the set shutter speed has elapsed. This shutter speed is limited to the frame rate of the drive signal. When the set shutter speed is longer than the frame rate of the drive signal, each pixel of the image sensor 10 is exposed for a time corresponding to the frame rate.

  On the other hand, FIG. 2B is a timing chart regarding the drive signal output from the driver 16 provided outside the image sensor 10. In FIG. 2B, the drive signal output from the driver 16 falls from the H level to the L level at time T3, and rises from the L level to the H level at time T4. When the drive signal falls (for example, time T3), exposure of each pixel of the image sensor 10 is started. When the drive signal rises (for example, at time T4), the exposure is completed and reading of the signal charge is started. The time from the fall of the drive signal output from the driver 16 to the rise (for example, the period from time T3 to time T4) is the shutter speed. When the drive signal output from the driver 16 is used, the frame rate is variable by controlling the falling and rising of the pulse signal of the drive signal output from the driver 16. That is, unlike the drive signal output from the internal oscillation device 10a, the shutter speed is not limited to the frame rate of the drive signal, and the pixel exposure time and signal readout from the pixel can be appropriately controlled.

(Signal charge readout method)
The electronic camera 200 has a plurality of readout methods for reading out signal charges accumulated in the image sensor 10. For example, the electronic camera 200 has a readout method such as an all-pixel readout method or a thinning readout method.

  The all-pixel readout method is used, for example, when recording image data relating to a still image is recorded on the recording medium 27. In the all-pixel readout method, the CPU 18 sets the drive signal input to the image sensor 10 as the drive signal output from the driver 16. In the all-pixel readout method, the image sensor 10 reads signal charges from all pixels in accordance with a drive signal from the driver 16.

  The thinning readout method is used, for example, when displaying a live view image on the display monitor 21. In the thinning readout method, the CPU 18 sets the drive signal input to the image sensor 10 as a drive signal that causes the internal oscillation device 10a to oscillate the drive signal at a predetermined frame rate. In the thinning readout method, signal charges are read out by thinning out some pixels of the image sensor 10 in accordance with the drive signal. Thereby, the data size of the image data to be subjected to image processing is reduced, and the processing load is reduced.

(Operation of ASIC 13)
The electronic camera 200 has a plurality of operation modes such as a shooting mode, a first live view display mode, and a second live view display mode. The ASIC 13 generates image data corresponding to each operation mode based on the digital signal output from the A / D conversion circuit 12. The first live view display mode and the second live view display mode are collectively referred to as a live view display mode.

  FIG. 3 is a functional block diagram relating to the ASIC 13. The ASIC 13 illustrated in FIG. 3 includes a first ASIC 131 and a second ASIC 132. The first ASIC 131 includes a first input unit 100, a first resize unit 101, a second resize unit 102, a first pre-processing unit 103, a first output unit 104, and a second output unit 105.

  The second ASIC 132 includes a second input unit 301, a third input unit 302, a second pre-processing unit 303, an evaluation value processing unit 304, a second image processing unit 305, a resizing processing unit 306, a first image processing unit 307, and a DSP ( A digital signal processor) unit 308, a display unit 309, a compression unit 312, and a recording unit 313.

(Shooting mode)
When the full push signal is output, the electronic camera 200 shifts to the shooting mode. When the electronic camera 200 is in the shooting mode, the readout method of the image sensor 10 is set to the all-pixel readout method. The signal charge of the image sensor 10 is read based on the drive signal output from the driver 16. These signal charges are converted into digital signals via the analog signal processing circuit 11 and the A / D conversion circuit 12 and output to the ASIC 13. The digital signal output from the A / D conversion circuit 12 is taken into the first input unit 100 of the first ASIC 131.

  In the shooting mode, the first input unit 100 outputs the digital signal captured from the A / D conversion circuit 12 to the first resizing unit 101. In the shooting mode, the first resizing unit 101 performs a resizing process for the recording image on the digital signal. The digital signal subjected to the resizing process by the first resizing unit 101 is output to the first output unit 104. The first output unit 104 outputs a digital signal to the second input unit 301 of the second ASIC 132.

  The second input unit 301 of the second ASIC 132 acquires the output signal of the first output unit 104 and outputs it to the second pre-processing unit 303 and the evaluation value processing unit 304. The second pre-processing unit 303 performs image preprocessing such as contour compensation and gamma correction on the signal acquired by the second input unit 301 and stores the processing result in the RAM 19 as first captured image data 401.

  The evaluation value processing unit 304 calculates an evaluation value 402 used for contrast adjustment, white balance adjustment, and the like, and stores the evaluation value 402 in the RAM 19. Based on the evaluation value 402 stored in the RAM 19, the DSP unit 308 sets parameters related to contrast adjustment and white balance adjustment in the first image processing unit 307.

  The first image processing unit 307 performs white balance adjustment, exposure correction, and contrast adjustment (dynamic range expansion) on the first captured image 401 stored in the RAM 19 based on each parameter output from the DSP unit 308. And the like, and the developed image 405 is stored in the RAM 19. Brightness / darkness adjustment is image processing for suppressing overexposure in the highlight portion of the first captured image 401 and reducing blackout in the shadow portion, and the processing is executed based on parameters set by the DSP portion 308. Is done. Brightness / darkness adjustment processing has many processing steps and consumes more power than other image processing.

The developed image 405 is compressed by the compression unit 312 into a compressed image 406 in a predetermined compression format (for example, JPEG). The compressed image 406 that has been compressed is recorded on the recording medium 27 of FIG. 1 by the recording unit 313 as a recording image.
A series of processes from when the electronic camera 200 is shifted to the shooting mode to when the recording image is recorded on the recording medium 27 is referred to as a shooting process.

(First live view display mode)
When the electronic camera 200 is in the first live view display mode, the readout method of the electronic camera 200 is set to the thinning readout method. The signal charge of the image sensor 10 is read at a predetermined frame rate based on the drive signal output from the internal oscillation device 10a. These signal charges are converted into digital signals via the analog signal processing circuit 11 and the A / D conversion circuit 12 and output to the ASIC 13. The digital signal output from the A / D conversion circuit 12 is taken into the first input unit 100 of the first ASIC 131.

  In the first live view display mode, the first input unit 100 outputs the digital signal captured from the A / D conversion circuit 12 to the second resize unit 102. The second resizing unit 102 performs resizing processing for image processing on the digital signal. The digital signal subjected to the resizing process by the second resizing unit 102 is a digital signal having smaller image data than the digital signal subjected to the resizing process performed by the first resizing unit 101 described above. The digital signal that has been subjected to the resizing process by the second resizing unit 102 is subjected to image preprocessing such as contour compensation and gamma correction by the first pre-processing unit 103, and is output to the second output unit 105. The second output unit 105 outputs the signal after image preprocessing to the third input unit 302 of the second ASIC 132.

  The third input unit 302 of the second ASIC 132 acquires the output signal of the second output unit 105 and outputs it to the second image processing unit 305. The second image processing unit 305 executes a second captured image by performing, on the signal acquired by the second output unit 105, image processing excluding at least contrast adjustment among the image processing performed by the first image processing unit 307. Data 403 is generated, and the second captured image data 403 is stored in the RAM 19. Since the second image processing unit 305 does not perform contrast adjustment, the power consumption is smaller than that of the first image processing unit 307.

  The resizing processing unit 306 performs resizing processing on the second captured image data 403 again, generates a display image 404, and stores it in the RAM 19. The display unit 309 outputs the display image 404 to the display monitor 21. In this way, the display image 404 is displayed as a live view image on the display monitor 21 at the frame rate of the drive signal output from the internal oscillation device 10a.

(Second live view display mode)
In the second live view display mode, a live view image to which the same image effect as that added to the developed image 405 generated in the shooting mode is added is displayed on the display monitor 21. For example, an image effect based on the aperture value and shutter speed used in the shooting mode, and an image effect based on exposure correction and contrast adjustment performed by the first image processing unit 307 of the second ASIC 132 in the shooting mode are added to the live view image. Thereby, the user can confirm the image effect added to the image obtained by photographing before photographing.

  In the second live view display mode, the readout method of the image sensor 10 and the processing procedure in the ASIC 13 differ depending on which image effect is added to the live view image. For example, in the second live view display mode, the electronic camera 200 sets the readout method of the image sensor 10 to the all-pixel readout method when an image effect based on the shutter speed used in the shooting mode is added to the live view image. That is, signal charges are read from all the pixels of the image sensor 10 based on the drive signal output from the driver 16 (FIG. 2B). On the other hand, when an image effect other than the image effect due to the shutter speed is added to the live view image, the readout method of the image sensor 10 is set to the thinning readout method. That is, signal charges are read from the image sensor 10 based on the drive signal (FIG. 2A) output from the internal oscillation device 10a. When an image effect based on the shutter speed is added to the live view image, as described above, when signal charge read-out control from the image sensor 10 is performed based on the drive signal output from the internal oscillation device 10a, the shutter speed becomes the drive signal. The frame rate may be limited. Therefore, by controlling the rising and falling timing of the drive signal output from the driver 16, it is possible to cope with the shutter speed used in the shooting mode.

  The read signal charges are converted into digital signals via the analog signal processing circuit 11 and the A / D conversion circuit 12 and output to the ASIC 13. The digital signal output from the A / D conversion circuit 12 is taken into the first input unit 100 of the first ASIC 131. Note that when an image effect by contrast adjustment is added to a live view image, the digital signal output from the A / D conversion circuit 12 is underexposure controlled.

  The destination to which the first input unit 100 of the first ASIC 131 outputs the digital signal captured from the A / D conversion circuit 12 is switched based on the image effect added to the live view image. For example, when adding an image effect by contrast adjustment to a live view image, the first input unit 100 outputs a digital signal to the first resizing unit 101. On the other hand, when adding an image effect other than the image effect by contrast adjustment to the live view image, the first input unit 100 outputs a digital signal to the second resize unit 102. When adding an image effect by contrast adjustment to a live view image, the digital signal is output to the first resizing unit 101 in the same manner as when the first input unit 100 is in the shooting mode. This is because the first image processing unit 307 is used. On the other hand, when an image effect other than the image effect by contrast adjustment is added to the live view image, a digital signal is sent to the second resizing unit 102 in the same manner as when the first input unit 100 is in the first live view display mode. The reason for outputting is to use the second image processing unit 305 that consumes less power than the first image processing unit 307. In addition, when a circuit for adjusting the brightness difference is provided in the second image processing unit 305 in order to add the image effect by the brightness difference adjustment to the live view image, the process of calculating the evaluation value increases, Power consumption and processing load increase when an image effect other than the image effect by contrast adjustment is added to the live view image.

  When adding an image effect by contrast adjustment to the live view image, the first input unit 100 outputs the digital signal captured from the A / D conversion circuit 12 to the first resizing unit 101. The first resizing unit 101 performs resizing processing on the digital signal output from the first input unit 100 so that the size of the display image is smaller than that of the recording image. The first resizing unit 101 outputs the digital signal after the resizing process to the first output unit 104. The first output unit 104 outputs the resized digital signal to the second input unit 301 of the second ASIC 132.

  The second input unit 301 of the second ASIC 132 acquires the output signal of the first output unit 104 and outputs it to the second pre-processing unit 303 and the evaluation value processing unit 304. The second pre-processing unit 303 performs image preprocessing such as contour compensation and gamma correction on the signal acquired by the second input unit 301 and stores the processing result in the RAM 19 as first captured image data 401.

  The evaluation value processing unit 304 calculates an evaluation value 402 used for contrast adjustment, and stores the evaluation value 402 in the RAM 19. The DSP unit 308 sets parameters related to light / dark difference adjustment in the first image processing unit 307 based on the evaluation value 402 stored in the RAM 19. The first image processing unit 307 performs brightness difference adjustment on the first captured image 401 using the parameters, and stores the developed image 405 in the RAM 19.

  When adding an image effect by contrast adjustment to a live view image, the resizing processing unit 306 performs resizing processing on the developed image 405 to generate a display image 404. The display unit 309 outputs the display image 404 to the display monitor 21 as a live view image.

  When adding an image effect other than the image effect by contrast adjustment to the live view image, the first input unit 100 outputs the digital signal captured from the A / D conversion circuit 12 to the second resizing unit 102. Thereafter, the display image 404 is generated by the same method as in the first live view display mode.

  FIG. 4 is a flowchart relating to a process of selecting a method for reading signal charges from the image sensor 10. The process shown in FIG. 4 is executed by the CPU 18.

  In step S500, the CPU 18 determines what the operation mode of the electronic camera 200 is. If the operation mode of the electronic camera 200 is the shooting mode, the CPU 18 proceeds to step S510. If the operation mode of the electronic camera 200 is the first live view display mode, the CPU 18 proceeds to step S520. If the operation mode is the second live view display mode, the process proceeds to step S530.

  In step S <b> 510, the CPU 18 selects the all-pixel readout method and sets a drive signal for controlling the image sensor 10 as a drive signal output by the driver 16. Then, the CPU 18 returns the process to step S500. In step S520, the CPU 18 selects the thinning readout method, and sets the drive signal for controlling the image sensor 10 to the drive signal that the internal oscillation circuit 10a oscillates. Then, the CPU 18 returns the process to step S500.

  In step S530, the CPU 18 determines what image effect is added to the live view display. In step S530, if the image effect added to the live view display is an image effect based on the shutter speed, the CPU 18 proceeds to step S540, and if the image effect added to the live view display is other than the image effect based on the shutter speed. Advances the process to step S550.

  In step S540, the CPU 18 selects the all-pixel readout method and sets the drive signal for controlling the image sensor 10 as the drive signal output by the driver 16. Then, the CPU 18 returns the process to step S500. In step S550, the CPU 18 selects the thinning readout method, and sets the drive signal for controlling the image sensor 10 to the drive signal that the internal oscillation circuit 10a oscillates. Then, the CPU 18 returns the process to step S500.

  FIG. 5 is a flowchart showing a flow of processing started by the CPU 18 when the main switch 22 is turned on and power is supplied to each part of the electronic camera 200.

  In step S600, the CPU 18 determines whether or not the operation mode of the electronic camera 200 is the live view display mode. When the operation mode of the electronic camera 200 is the first live view display mode or the second live view display mode, an affirmative determination is made in step S600. CPU18 advances a process to step S601, when step S600 is determined affirmative, and advances a process to step S620, when step S600 is negatively determined.

  In step S601, the CPU 18 determines whether or not the operation mode of the electronic camera 200 is the second live view display mode. If step S601 is positively determined, the process proceeds to step S602. If step S601 is negatively determined, that is, if the operation mode of the electronic camera 200 is the first live view display mode, the process proceeds to step S610. Proceed to

  In step S602, the CPU 18 determines whether or not the image effect added to the live view image in the second live view display mode is an image effect due to the shutter speed. CPU18 advances a process to step S603, when step S602 is affirmed and advances a process to step S610, when step S602 is negatively determined.

  In step S <b> 603, the CPU 18 starts reading signal charges of the image sensor 10 using the all-pixel reading method. The signal charge read from the image sensor 10 is converted into a digital signal via the analog signal processing circuit 11 and the A / D conversion circuit 12 and output to the ASIC 13.

In step S604, the CPU 18 causes the ASIC 13 to generate the display image 404.
In step S <b> 605, the CPU 18 displays a live view image on the display monitor 21. The CPU 18 causes the ASIC 13 to output the display image 404 to the display monitor 21. The display image 404 is displayed on the display monitor 21 as a live view image.

  In step S606, the CPU 18 determines whether or not a full press signal of the full press switch 24 has been input. CPU18 advances a process to step S620, when step S606 is determined affirmative, and returns a process to step S600, when step S606 is negatively determined.

  In step S610, the CPU 18 starts reading signal charges of the image sensor 10 using the thinning readout method. The signal charge read from the image sensor 10 is converted into a digital signal via the analog signal processing circuit 11 and the A / D conversion circuit 12 and output to the ASIC 13.

  In step S611, the CPU 18 determines whether or not the image effect added to the live view image in the second live view display mode is an image effect due to contrast adjustment. CPU18 advances a process to step S612, when step S611 is affirmed and advances a process to step S604, when step S611 is negatively determined. When the operation mode of the electronic camera 200 is the first live view display mode, the CPU 18 makes a negative determination in step S611 and advances the process to step S604.

  In step S612, the CPU 18 causes the ASIC 13 to generate a display image 404 for light / dark difference adjustment. That is, the CPU 18 causes the ASIC 13 to generate a developed image 405 and to generate a display image 404 using the developed image 405.

  In step S620, the CPU 18 executes shooting processing. That is, the CPU 18 executes a series of processes from when the electronic camera 200 is shifted to the shooting mode until the recording image is recorded on the storage medium 27.

  In step S621, the CPU 18 determines whether or not to end the process shown in FIG. For example, the CPU 18 determines whether or not the main switch 20 is turned off. CPU18 complete | finishes the process of FIG. 5, when step S621 is affirmed determination, and when step S621 is determined negative, it returns a process to step S600.

According to the embodiment described above, the following operational effects can be obtained.
The electronic camera 200 includes an image sensor 10, an ASIC 13, and a CPU 18. The image sensor 10 performs exposure of a plurality of pixels and readout of signal charges under the control of a drive signal. The ASIC 13 can generate at least a recording image and a live view image to which an image effect added to the recording image is added based on signal charges read from a plurality of pixels. The CPU 18 sets a drive signal for controlling the image sensor 10 according to the image effect added by the ASIC 13.
In the second live view display mode, when the CPU 18 adds an image effect based on the shutter speed to the live view image, the driver 16 outputs the drive signal so that the drive signal is not limited by the frame rate of the drive signal of the internal oscillation device 10a. Set the drive signal to be output. Thus, by setting the drive signal in accordance with the image effect added to the live view image, the ASIC 13 can generate the live view image with the image effect added.

The embodiment described above can be implemented with the following modifications.
[Modification 1] Even when an image effect different from the image effect due to the shutter speed is added to the live view image, the signal charge may be read by the drive signal output from the driver 16.

[Modification 2]
In the above embodiment, the live view image is displayed on the display monitor 21 built in the electronic camera 200, but may be displayed on an external display device. When displaying a live view image on an external display device, the ASIC 13 further includes a second display unit different from the display unit 309, and outputs a display image from the second display unit to the external display device. The second display unit outputs a display image at a frame rate suitable for an external display device. For example, when the screen resolution of the external display device is higher than that of the display monitor 21, the frame rate is lowered.

[Modification 3]
In the above embodiment, in the live view display mode, the ASIC 13 displays a display image obtained by performing the resizing process on the developed image 405, and a display image obtained by performing the resizing process on the second captured image data 403. Any one of these is output from the display unit 309 toward the display monitor 21. However, the ASIC 13 simultaneously generates both a display image that has been resized on the developed image 405 and a display image that has been resized on the second captured image data 403, and simultaneously generates them. It may be displayed on the display monitor 21 or the like. Two display images may be displayed simultaneously on different display devices, or may be displayed side by side on the display monitor 21. As a result, a live view image to which contrast adjustment is applied and a live view image to which other image effects (for example, an image effect by an aperture) are added can be used to compare a plurality of image effects and to adjust a plurality of image effects. It is possible to shoot while performing.

  The ASIC 13 further includes a combining unit that combines the display image obtained by performing the resizing process on the developed image 405 and the display image obtained by performing the resizing process on the second captured image data 403. May be output to the display monitor 21. In this way, the ASIC 13 can create a live view image in which two images are superimposed.

  The embodiments and modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. Further, the embodiments and modifications described above may be combined and executed as long as the features of the invention are not impaired.

10 Image sensor 10a Internal oscillator 13 ASIC
16 Driver 17 Timing generator 20 ROM
21 Display monitor 27 Recording medium 313 Recording unit 200 Electronic camera

Claims (2)

An imaging unit in which a plurality of pixels are exposed and signals are output from the plurality of pixels;
An image is generated by signals output from the plurality of pixels, and the generated image is subjected to image processing and recorded in a recording unit, and an image effect added to the recording image is added. An image generation unit capable of generating at least a display image;
When the display image is generated, if the image effect added to the recording image is different from the image effect due to the shutter speed, a first frame for instructing start of exposure of the plurality of pixels at a predetermined frame rate. According to the driving signal, the signal from the plurality of pixels is output,
When the image effect added by the image generation unit is an image effect due to a shutter speed , a signal is output from the plurality of pixels by a second drive signal different from the first drive signal, A control unit capable of setting an exposure time of a plurality of pixels to a time longer than a cycle of the frame rate . The imaging device according to claim 1 ,
The control unit, when causing the image generation unit to generate the recording image, causes the second drive signal to output signals from the plurality of pixels.

Images