JP2002218313A - Digital camera - Google Patents

Digital camera

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Publication number
JP2002218313A
JP2002218313A JP2001013567A JP2001013567A JP2002218313A JP 2002218313 A JP2002218313 A JP 2002218313A JP 2001013567 A JP2001013567 A JP 2001013567A JP 2001013567 A JP2001013567 A JP 2001013567A JP 2002218313 A JP2002218313 A JP 2002218313A
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JP
Japan
Prior art keywords
image
means
digital camera
display
shooting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001013567A
Other languages
Japanese (ja)
Other versions
JP3864407B2 (en
Inventor
Yoshiharu Gotanda
芳治 五反田
Original Assignee
Fuji Photo Film Co Ltd
富士写真フイルム株式会社
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Filing date
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Application filed by Fuji Photo Film Co Ltd, 富士写真フイルム株式会社 filed Critical Fuji Photo Film Co Ltd
Priority to JP2001013567A priority Critical patent/JP3864407B2/en
Publication of JP2002218313A publication Critical patent/JP2002218313A/en
Application granted granted Critical
Publication of JP3864407B2 publication Critical patent/JP3864407B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To eliminate image breaking in digital image processing of electronic zoom or the like, when the image is digitally added to realize multiple exposure photographing by each photographing. SOLUTION: When a multiple exposure mode is set by the operation of a control switch 24, a main CPU 22 inhibits changes in the magnification of the electronic zoom, white balance, number of pixels, compression rate, gradation characteristics and sharpness, and fixes the magnification of the electronic zooming or the like to a plurality of images to be picked up in the multiple exposure mode under the same conditions. Thus, the sizes or the like of first image and second and following images are unified, and when an image signal processing circuit 44 digitally processes the image, including a digitally adding process, the image breaking does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital camera, and more particularly to a digital camera capable of performing multiple exposure photographing.

[0002]

2. Description of the Related Art Conventionally, as an image pickup apparatus having a CCD image pickup device capable of performing multiple exposure photographing, Japanese Patent Application Laid-Open No. H11-1780 is disclosed.
No. 01 is disclosed.

[0003] This imaging apparatus uses a CC within one frame period.
The multi-exposure shooting is performed by accumulating the electric charges on D in a plurality of times.

[0004]

The multi-exposure shooting by the conventional imaging apparatus is applied to the analysis of a moving object of a subject and the like, and each shutter pulse in the multi-exposure shooting is automatically output at a required timing. , The multiple exposure shooting ends instantly. Therefore, for example, it is impossible to perform multiple exposure photographing in which completely different subjects are separately photographed and these are combined.

[0005] On the other hand, with the progress of digital technology in recent years,
Multiple exposure photography can be realized by digitally adding images for each photography.

However, when multiple exposures are realized by digitally adding images for each photographing, for example, if the electronic zoom (images are cut out and displayed / recorded) are changed for each photographing, the difference in the size of the cut-out range by the electronic zoom will occur. Therefore, there is a problem that a portion to be added and a portion not to be added are mixed, and a region subjected to multiple exposure and a region not subjected to multiple exposure occur. Also, the number of images per image (image size)
Also causes the same problem as described above.

The present invention has been made in view of such circumstances, and when digitally adding an image for each photographing to realize multiple exposure photographing, an image is not broken in digital image processing such as electronic zoom. It is another object of the present invention to provide a digital camera capable of confirming an image or the like which has been multiple-exposed before recording and capable of retaking the last captured image.

[0008]

In order to achieve the above object, a digital camera according to a first aspect of the present invention comprises: a mode setting means for setting a multiple exposure mode capable of performing multiple exposure shooting; When an exposure mode is set and photographing for a plurality of images is performed, image generating means for digitally adding images captured for each photographing to generate a multi-exposure added image, and a multiple exposure mode by the mode setting means. Is set, means for prohibiting a function to be adjusted or set regarding digital image processing at the time of photographing the second and subsequent images.

The function to be adjusted or set includes an electronic zoom function, a white balance,
It is characterized by including at least one of the functions of setting the number of pixels, compression ratio, gradation characteristics, and sharpness.
The digital camera according to claim 3 of the present application has a mode setting unit that sets a multiple exposure mode capable of performing multiple exposure shooting, and a multiple exposure mode is set by the mode setting unit.
When photographing for a plurality of images is performed, an image generating unit that generates a multi-exposure added image by digitally adding an image captured for each photographing, and a multi-exposure mode set by the mode setting unit, Means for inhibiting the function of the electronic zoom. As a result, the size of the first image and the size of the second and subsequent images are unified, so that image failure does not occur when digitally adding each image.

The means for inhibiting the function of the electronic zoom includes:
As set forth in claim 4 of the present application, the photographing magnification by the electronic zoom is fixed at the same magnification. Further, the electronic zoom control device is characterized in that, when the function of the electronic zoom is prohibited, there is provided a display means for reflecting in a display content that the operation switch of the electronic zoom is invalid as shown in claim 5 of the present application.

The image generating means subtracts the offset corresponding to the black level from the second and subsequent images and adds the result to the preceding image, as described in claim 6 of the present application, and outputs the data of the offset. Is not accumulated.

According to a seventh aspect of the present invention, there is provided the digital camera, wherein the image display means displays the image of the subject before photographing as a through image on the image display means, and the image before photographing and before recording is used as the preview image as the preview image. And a display control means for displaying the image to be photographed and the image subjected to multiple exposure after photographing.

[0013] The image generating means has three storage areas for storing images for three frames as described in claim 7 of the present application, and these three storage areas are used to store the captured image captured in the current shooting. A storage area for storing an image obtained by adding the images captured up to the previous shooting, or a storage area storing the image as a keep pixel when the number of images captured until the previous shooting is one; The captured image captured by shooting and the keep image are separately used for a storage area for storing an added image obtained by adding processing, and the display control means uses the captured image captured in the first shooting or the added image as a preview image. When the image is displayed on the image display means and a retake is instructed while the preview image is being displayed by the image display means, a new image can be captured instead of the last captured image. It is characterized by having steps.
Further, as set forth in claim 7 of the present application, there is provided switching means for selectively switching between the display of the through image and the display of the keep image during the display of the through image by the image display means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a digital camera according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a rear view of a digital camera according to the present invention. On the upper surface of the digital camera 10, a shooting mode selection dial 11 and a shutter button 12 are provided. By rotating the shooting mode selection dial 11, various shooting modes such as a manual shooting mode, an automatic shooting mode, and a portrait mode can be set. A shutter button 12 provided at the center of the shooting mode selection dial 11 is turned on when pressed halfway, a switch S1 for preparing for shooting such as focus lock and photometry, and turned on when pressed fully to capture an image. And a switch S2.

Also, as shown in FIG.
On the back of the camera, a finder 13, a display button 14, a power button 15, a shooting / playback mode selection switch 16, a back switch 17, a menu / OK switch 18, a multi-function cross key 19, a dot matrix liquid crystal display 20, And a liquid crystal monitor 21.

The liquid crystal display 20 displays the operation mode of the camera, the function of the cross key 19, and the like using characters and icons. The liquid crystal monitor 21 displays a moving image (through image) and can be used as an electronic viewfinder, and displays an image before recording (preview image), a reproduced image read from a memory card loaded in the camera, and the like. can do. Further, the LCD monitor 21 displays various menus for manually setting the number of frames that can be shot and the number of reproduced frames, white balance for manually setting, the number of pixels, compression ratio, sharpness, and the like.
Displayed in response to the operation of the OK switch 18 or the cross key 19. The setting of the multiple exposure mode according to the present invention is performed by pressing the menu / OK switch 18 in the manual shooting mode to display the manual shooting menu on the liquid crystal monitor 21 and selecting “multiple exposure mode ON” by the cross key 19. Done by

FIG. 2 is a block diagram showing the internal configuration of the digital camera 10 shown in FIG.

Referring to FIG. 1, the main CPU 22 includes a shooting mode selection dial 11 and a shutter button 1 as described above.
2, power switch 15, shooting / playback mode selection switch 16, back switch 17, menu / OK switch 1
8 and the circuits in the digital camera 10 based on the input from the operation switch 24 including the cross key 19 and the like. The main CPU 22 includes an SDRAM (synchronous dynamic RAM) 26, a ROM 28,
Necessary data is exchanged with the EPROM 30. The ROM 28 stores a camera control program and the like, and the EEPROM 30 stores various parameters and data related to camera control such as defect information of the solid-state imaging device.

First, when the power switch 15 is operated,
The CPU 22 detects this and turns on the power supply in the camera. When the photographing mode is selected by the photographing / reproduction mode selection switch 16, the photographing standby state is set.

When the shutter button 12 is pressed in the above-described shooting standby state, the CPU 22 detects this and sends a command to the camera CPU 32. Camera CPU 32
Performs focus control, photometry, and exposure control, and outputs image light of a subject via the optical unit 34 to a solid-state imaging device (CC).
D) An image is formed on the light receiving surface 36. The CCD 36 converts the image light formed on the light receiving surface into signal charges of an amount corresponding to the light amount. The signal charge thus accumulated is read out to the shift register by a read gate pulse applied from the clock generation circuit 38, and is sequentially read out as a voltage signal corresponding to the signal charge by the register transfer pulse. The CCD 36 has a so-called electronic shutter function that can sweep out the stored signal charges by a shutter gate pulse, thereby controlling the charge storage time (shutter speed).

The voltage signal output from the CCD 36 is subjected to analog processing such as correlated double sampling and amplification by an analog processing circuit 40.
The signals are applied to the A / D converter 42 as G and B signals. A /
The D converter 42 converts the R, G, and B signals sequentially applied from the analog processing circuit 40 into 12-bit R, G, and B signals.
Convert to a signal. These R, G, B signals are once converted to SD
It is stored in the RAM 26.

The image signal processing circuit 44 includes the SDRAM
The 12-bit raw data of R, G, and B stored in H.26 is read out, and a white balance is adjusted by applying a digital gain according to the type of light source to the raw data, and a gamma (gradation characteristic) process and a sharpness process are performed. Then, 8-bit R, G, and B signals are generated, and further, YC signal processing is performed to generate a luminance signal Y and chroma signals Cr, Cb (YC signals), and the YC signals are stored in the SDRAM 26 again.
In the white balance adjustment, the light source type is determined based on the acquired R, G, and B signals, and a white balance correction value (digital gain for each of R, G, and B) suitable for the determined light source type is used. Auto white balance adjustment,
There is manual white balance adjustment using a white balance correction value suitable for a light source type manually selected in advance. The sharpness process is a process of emphasizing or softening an outline. In the manual photographing mode, the degree of outline emphasis can be manually set to one of strong, normal, and weak.

The YC signal stored in the SDRAM 26 as described above is compressed into a predetermined format by the compression / decompression circuit 46, and then the interface circuit 4
8 is recorded on the memory card 50.

On the other hand, the photographing / playback mode selection switch 16
When the playback mode is selected by the
Is read out via the interface circuit 48. The compressed data of the read image file is expanded into an uncompressed YC signal via a compression / expansion circuit 46.

The decompressed YC signal is applied to a video encoder 54 via a VRAM 52, where the NTSC
Is converted to a color composite video signal of the
Is output to Thereby, the frame image of the last frame recorded on the memory card 50 is displayed on the liquid crystal monitor 21.

Then, a forward frame advance switch (cross key 1)
When the right key (9) is pressed, frame advance is performed in the forward direction. When the reverse frame advance switch (left key of the cross key 19) is pressed, frame advance is performed in the reverse direction. Then, the image file at the frame position at which the frame is advanced is read from the memory card 50, and the frame image is reproduced on the liquid crystal monitor 21 in the same manner as described above. If the frame is advanced in the forward direction while the frame image of the last frame is displayed, the image file of the first frame recorded on the memory card 50 is read out, and
The frame image of the frame is reproduced on the liquid crystal monitor 21.

Next, the multiple exposure function of the digital camera 10 will be described.

The multi-exposure function is, as described above, when "multi-exposure mode ON" is selected and the multi-exposure mode is set, and thereafter, a plurality of images taken in a plurality of times of photographing are digitally added. Enables multiple exposure photography.

When the multiple exposure mode is set, first, the main CPU 22 prohibits the electronic zoom function and prohibits changes in the white balance, the number of pixels, the compression ratio, the gradation characteristics, and the sharpness. That is, for a plurality of images captured in the multiple exposure mode,
The white balance, the number of pixels, the compression ratio, the gradation characteristics, and the sharpness are fixed under the same conditions.

Since the electronic zoom cuts out the central portion of the photographing area captured by the CCD 36 in accordance with the electronic zoom magnification, images having different electronic zoom magnifications have different sizes (number of pixels). Therefore, the electronic zoom magnification is fixed so that the number of pixels of the image to be added at the time of the multiple exposure is the same. For the same reason, the number of pixels of the captured image cannot be changed.

In this embodiment, if the electronic zoom function is used before setting the multiple exposure mode,
When the multiple exposure mode is set, the zoom magnification is returned so as to be equal. The electronic zoom can be zoomed up and down by operating the up and down keys of the cross key 19. The dot matrix liquid crystal display 20 has a zoom up key and a down key. An icon indicating that the key is assigned to the zoom-down key is displayed. However, when the electronic zoom function is prohibited as described above, the icon indicating the key assignment of the liquid crystal display 20 is deleted. .

The reason why the white balance, the compression ratio, the gradation characteristics, and the sharpness processing are fixed under the same conditions is that these processings are performed by digital processing based on 12-bit R, G, B raw data. , G, and B raw data are added to perform multiple exposures, so that different digital processing cannot be performed for a plurality of captured data.

The function prohibited when setting the multiple exposure mode is not limited to this embodiment, but any function may be used as long as the function is adjusted or set for digital image processing. Further, in this embodiment, when the multiple exposure mode is set, the adjustment or setting related to the digital image processing is immediately prohibited, but is prohibited at the time of shooting the second and subsequent images in the multiple exposure mode. You may.

Next, the operation of the digital camera 10 in the multiple exposure mode will be described with reference to the flowchart of FIG.

First, when the multiple exposure mode is set, a through image indicating a subject is displayed on the liquid crystal monitor 21, and the camera enters a shooting standby state (step S10). Here, when the shutter button 12 is fully pressed (the switch S2 is turned on), the 12-bit raw data of R, G, and B is taken into the SDRAM 26 as described above (step S12).

FIG. 4 shows the SDRAM 26 in the multiple exposure mode.
3 shows a memory map in which the storage area for one frame of R, G, B raw data is three frames (frames A, B,
C) Secured. The storage areas for these three frames are separately used as an area for storing the captured image, an area for storing the added image, and an area for storing the keep image.

Here, the captured image is R, G, B raw data newly captured from the CCD 36 for each photographing.
The added image is an image obtained by adding the keep image or the added image up to the previous time and the captured image captured this time, and the keep image is the captured image of the first frame held for addition or the image up to the previous time. It is an addition image.

The R, G, B raw data of the first frame captured in step S12 is stored in the area of frame A as a captured image. Then, a preview image is generated based on the captured image and displayed on the liquid crystal monitor 21 (step S14).

In step S14, when the right key of the cross key 19 is pressed while the preview image is displayed, the captured image stored in the area of the frame A is secured as a keep image to be multiple-exposed. (Step S16). As a result, the next shooting in the multiple exposure mode becomes possible.

On the other hand, if the left key of the cross key 19 is pressed in step S14, the storage area of the SDRAM 26 storing the captured image is cleared (step S18), and the process returns to step S10. When the back switch 17 is pressed, the storage area for three frames of the SDRAM 26 is cleared (step S20).
It returns to step S10. In step S14, the SDRA
Since only the captured image of the first frame is stored in M26, the operation of the left key of the cross key 19 is performed by the back switch 1
The result is the same as the operation of step 7.

When the menu / OK switch 18 is pressed in step S14, the process jumps to step S22, where the preview image is recorded on the memory card 50. In this case, since the multiple exposure is not performed, the same result as that of one frame photographing in the preview photographing mode (a photographing mode for selecting whether or not to display the preview image and then record) is obtained. Step S2
When the recording process is completed in step 2, the memory is cleared in step S20, and the process returns to step S10.

When the captured image is secured as a keep image in step S16, the display screen of the liquid crystal monitor 21 is switched from the preview image to the through image (step S24).

In step S24, when the shutter button 12 is fully pressed, a new 12-bit R, G, B
Raw data is taken into the SDRAM 26 (step S
26). This captured image is stored in the frame B of the SDRAM 26.
Is stored in the storage area. Subsequently, the captured image and the keep image already stored in the SDRAM 26 are represented by R,
Addition is performed for each of the G and B pixels, and this is used as an added image in SDR.
The data is stored in the storage area of the AM 26 (step S28).

When adding the captured image to the keep image, the offset corresponding to the black level of the captured image is subtracted from the captured image as shown in FIG. Add embedded images. This prevents the offset from being accumulated.

When the added image is created as described above, the display screen of the liquid crystal monitor 21 is switched from the through image to the preview image indicating the added image (step S).
30).

In step S30, when the right key of the cross key 19 is pressed, the previewed added image is secured as a keep image (step S32).
Returning to step S24, the through image is displayed on the liquid crystal monitor 21 again. By repeating the processing of steps S24 to S32, the number of frames to be subjected to multiple exposure can be arbitrarily selected.

FIG. 6 shows the number of frames to be subjected to multiple exposure and the SDRAM.
26 shows the relationship between the image stored in each storage area of the 26th frame ABC. In the figure, “PR” indicates a previewed image, “KEEP” indicates a keep image, “A + B” indicates an added image of the images in the respective storage areas of frames A and B, and “B + C” indicates a frame. B and C
3 shows an added image of the images in the respective storage areas.

For example, when the second image is shot in the multiple exposure mode, a new captured image is stored in the area of the frame B, and the keep image and the frame B stored in the area of the frame A are stored. The added image with the captured image stored in the area is stored in the area of frame C. Similarly, when the third image is captured, a new captured image is stored in the area of frame B, and the keep image (added image up to the previous time) stored in the area of frame C and frame B The added image with the captured image stored in the area
Is stored in the area.

On the other hand, if the left key of the cross key 19 is pressed in step S14, the captured image captured in step S26 is cleared (step S34), and the process returns to step S24. Thus, the image to be added to the keep image can be retaken. When the back switch 17 is pressed, the SDRA is executed in step S20.
After clearing the storage area for three frames of M26,
It returns to step S10. Thus, multiple exposure shooting can be performed again from the beginning.

In step S30, menu / OK
When the switch 18 is pressed, white balance adjustment, gamma processing and sharpness processing are performed on the previewed added image (12-bit R, G, B raw data) to obtain 8-bit R, G, B data. After the YC processing, the data is compressed at a preset compression ratio and recorded on the memory card 50 (step S22). When this recording process is completed, the memory is cleared in step S20, and the process returns to step S10.

Note that the liquid crystal monitor 21 displays a through image between multiple exposure shootings. During the display of the through image, the liquid crystal monitor 21 switches to the previous added image (ie, the keep image to be added). Further, a changeover switch for switching from the keep image to the through image may be provided.

[0053]

As described above, according to the present invention, multiple exposure shooting is realized by digitally adding images for each shooting, and especially in the multiple exposure mode, electronic zoom magnification, white balance, number of pixels, compression ratio Since the change of the gradation characteristic, the sharpness, etc. is prohibited, it is possible to prevent the image from being broken in the digital image processing. In addition, since the multi-exposure shooting is realized by digital addition processing, a through image can be displayed between the multi-exposure shootings. In addition, a preview image that has been subjected to multiple exposure can be displayed, so that the image that has been subjected to multiple exposure before recording can be confirmed. Further, since the latest captured image and the added image up to the previous time are stored in different storage areas, if the result of the multiple exposure is not satisfied, the last captured image can be retaken.

[Brief description of the drawings]

FIG. 1 is a rear view of a digital camera according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of the digital camera.

FIG. 3 is a flowchart used to explain an operation of the digital camera in a multiple exposure mode.

FIG. 4 is a diagram showing a memory map of an SDRAM in a multiple exposure mode;

FIG. 5 is a diagram used to explain offsets included in R, G, and B raw data;

FIG. 6 is a table used to explain the proper use of storage areas for three frames of the SDRAM in the multiple exposure mode.

[Explanation of symbols]

10: Digital camera, 11: Shooting mode selection dial, 12: Shutter button, 17: Back switch,
18 Menu / OK switch, 19 Cross key, 20
... Liquid crystal display, 21 ... Liquid crystal monitor, 22 ... Main CP
U, 26 SDRAM, 34 optical unit, 36 C
CD, 44: image signal processing circuit, 46: compression / expansion circuit, 50: memory card

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H04N 5/335 H04N 5/335 Q // H04N 101: 00 101: 00

Claims (9)

[Claims]
1. A mode setting means for setting a multiple exposure mode capable of performing multiple exposure photographing, and a multi-exposure mode is set by the mode setting means. Image addition means for generating a multi-exposure added image by digital addition processing, and when the multi-exposure mode is set by the mode setting means, adjustment or setting relating to digital image processing at the time of shooting the second and subsequent images is performed. And a means for prohibiting the function of the digital camera.
2. The function to be adjusted or set includes at least one of an electronic zoom function, a white balance, the number of pixels, a compression ratio, a gradation characteristic, and a sharpness setting function. 1 digital camera.
3. A mode setting means for setting a multi-exposure mode capable of performing a multi-exposure photographing, and a multi-exposure mode is set by the mode setting means. Image generation means for generating a multi-exposure added image by digital addition processing of: and a means for inhibiting the function of the electronic zoom when the multi-exposure mode is set by the mode setting means. And a digital camera.
4. The digital camera according to claim 3, wherein the means for inhibiting the function of the electronic zoom fixes a photographing magnification by the electronic zoom to a unity magnification.
5. When the electronic zoom function is prohibited,
5. The digital camera according to claim 3, further comprising display means for reflecting, in a display content, that the operation switch of the electronic zoom is invalid.
6. The image processing apparatus according to claim 1, wherein the image generation unit subtracts an offset corresponding to a black level from the second and subsequent images and then adds the offset to a preceding image. A digital camera according to any of the above.
7. An image display means, a display control means for displaying an image of a subject before shooting as a through image on the image display means, and displaying an image before shooting and before recording on the image display means as a preview image, The digital camera according to any one of claims 1 to 6, further comprising:
8. The image generating means has three storage areas for storing images for three frames, a storage area for storing captured images obtained by capturing these three storage areas in the current shooting, An image obtained by adding the images captured up to the previous shooting, or a storage area that stores the image as a keep pixel when there is only one image captured before the previous shooting, and a capture area captured in the current shooting The display control means uses the image and the keep image as a storage area for storing an added image obtained by performing an addition process, and causes the image display means to display the captured image or the added image captured in the first shooting as a preview image. When a retake is instructed during display of the preview image by the image display means, a means for enabling a new image to be taken in instead of the last taken image is provided. The digital camera according to claim 7.
9. The digital camera according to claim 8, further comprising switching means for selectively switching between display of the through image and display of the keep image during display of the through image by the image display means.
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JP2010056733A (en) * 2008-08-27 2010-03-11 Sony Corp Imaging device and method, program, and recording medium
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US8368782B2 (en) 2008-08-27 2013-02-05 Sony Corporation Multiple exposure image pickup apparatus, multiple exposure image pickup method, program, and recording medium
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