JP2004096400A - Photographing device, image recording device, and program - Google Patents

Photographing device, image recording device, and program Download PDF

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Publication number
JP2004096400A
JP2004096400A JP2002254448A JP2002254448A JP2004096400A JP 2004096400 A JP2004096400 A JP 2004096400A JP 2002254448 A JP2002254448 A JP 2002254448A JP 2002254448 A JP2002254448 A JP 2002254448A JP 2004096400 A JP2004096400 A JP 2004096400A
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JP
Japan
Prior art keywords
image
color space
color
means
display
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.)
Pending
Application number
JP2002254448A
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Japanese (ja)
Inventor
Taizo Aoki
Ken Hotokezaki
佛崎 建
青木 泰造
Original Assignee
Minolta Co Ltd
ミノルタ株式会社
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Priority to JP2002254448A priority Critical patent/JP2004096400A/en
Publication of JP2004096400A publication Critical patent/JP2004096400A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To perform color rendering suitable for a display device, while setting of a color rendering range can be done according to a photographing purpose. <P>SOLUTION: A digital camera 1 is configured to contain an LCD (liquid crystal display) 10 and an EVF (electronic view finder) 20 for displaying an image, and can select and operate a color space of an image obtained from a photographing sensor 303 by a control unit 250. As for a genuine image to be compressed and recorded in a memory card 8, an image processing circuit GP is configured to conduct color conversion processing adapted to the color space selected by the control unit 250 for generation the genuine image. On the other hand, as for an image to be displayed on the LCD 10 or the EVF 20, the image processing circuit GP is configured not to conduct color conversion processing adapted to a color space selected by a user, but to conduct color conversion processing adapted to a color space matched to display characteristics of a display device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an imaging device such as a digital camera, an image recording device, and a program, and more particularly to a technology for reproducing color of an image.
[0002]
[Prior art]
FIG. 10 shows a general xy chromaticity diagram. In FIG. 10, a region R1 is a visible region, and a region R2 is an sRGB color space which is an international color reproduction standard.
[0003]
An image captured by an imaging device such as a digital camera is often taken into an external device such as a personal computer and reproduced and displayed on a CRT monitor or the like of the external device in many cases. For this reason, in the related art, when a captured image is recorded by an imaging device, the color reproduction range is recorded, for example, in conformity with the sRGB color space (region R2 in FIG. 10). As a result, it was possible to achieve color matching with CRT monitors of many devices.
[0004]
However, in some image reproducing apparatuses such as ink jet printers, the color reproduction range exceeds the sRGB color space as shown by a region R3 in FIG. For this reason, assuming that the purpose of image capturing by the image capturing apparatus is exclusively for image reproduction by such an image reproducing apparatus, it is not preferable to perform image recording in conformity with the sRGB color space having a narrow color reproduction range. Absent. This is because the colors that can be originally reproduced are adapted to a narrow color space called the sRGB color space, and the color components in the hatched area shown in FIG. 10 cannot be reproduced.
[0005]
Particularly in recent years, it has become possible to directly output an image from a digital camera to a printer without using a personal computer. In such a case, the color reproduction characteristics of a CRT monitor of an external device become completely irrelevant. .
[0006]
Therefore, in the above-described case, the image pickup apparatus is adapted to record an image in a color space having a wider color reproduction range than a general sRGB color space, such as an Adobe RGB color space (region R4 in FIG. 10). It is desired to perform. Such an image pickup apparatus is being commercialized. For example, when a user performs a setting operation based on a setting menu screen as shown in FIG. 11, a desired color space is set according to a use purpose of an image obtained by shooting. In the color conversion processing inside the image pickup apparatus, which is selected and set, the parameters of the color conversion processing are changed according to the color space selected by the user, and the image is recorded by performing the color conversion of the image.
[0007]
On the other hand, when recording an image, some image pickup apparatuses record a thumbnail image together with a recording main image obtained by photographing. The thumbnail image is used as an image for exclusively displaying an image on a display device such as a viewfinder provided in the imaging device. In general, the color space that can be displayed on such a display device is often close to the sRGB color space.
[0008]
[Problems to be solved by the invention]
However, in the conventional image capturing apparatus, the thumbnail image is created by directly reducing the image obtained by performing the color conversion processing on the main image, and therefore, when the color space setting is changed according to the shooting purpose. Also, the color space of the thumbnail image has been changed corresponding to the main image.
[0009]
Also, when performing live view display or after view display on a display device such as a viewfinder, the live view image or the after view image is displayed as a reduced image obtained by the set color conversion processing as it is. When the setting of the color space is changed according to the purpose, the color space of the live view image or the after view image is also changed corresponding to the main image.
[0010]
In other words, the conventional imaging apparatus is suitable for a display device even if the image is generated to exclusively display an image on a display device provided in the imaging apparatus (thumbnail image, live view image, after-view image, etc.). In some cases, color reproduction cannot be performed, and depending on the setting of the color space, the subject is displayed in a color different from the actual color.
[0011]
In view of the above, the present invention has been made in view of the above-described problems, and enables color reproduction suitable for a display device to be performed when displaying an image, while enabling setting of a color reproduction range according to a shooting purpose. It is an object to provide such a color reproduction technology.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an invention according to claim 1 is an imaging apparatus including a display unit for displaying an image, the imaging device being provided with an imaging unit that captures an image of a subject, and the imaging unit being obtained by the imaging unit. Operation means for selecting and operating a color space of an image, image processing means for performing color conversion processing in conformity with the color space selected by the operation means, and an image subjected to color conversion processing in the image processing means Recording means for recording, the image processing means does not adapt to the color space selected by the operation means, for the image displayed on the display means, the display characteristics of the display means The color conversion processing is performed in conformity with the matched color space.
[0013]
According to a second aspect of the present invention, in the imaging device according to the first aspect, the image displayed on the display unit is an image recorded on the recording unit as a thumbnail image of an image obtained from the imaging unit. It is characterized by having.
[0014]
According to a third aspect of the present invention, in the imaging device according to the first aspect, the image displayed on the display unit is a preview image for confirmation before photographing.
[0015]
According to a fourth aspect of the present invention, there is provided an image recording apparatus which is configured to be connectable to an imaging device and includes display means capable of displaying an image obtained from the imaging device, wherein a color of an image obtained from the imaging device is Operating means for selecting and operating a space; image processing means for performing color conversion processing in conformity with the color space selected by the operation means; and recording an image which has been subjected to color conversion processing in the image processing means. Recording means, wherein the image processing means does not adapt the image displayed on the display means to the color space selected by the operation means, but matches the display characteristics of the display means. It is configured to perform color conversion processing in conformity with the space.
[0016]
The invention according to claim 5 is a program, wherein the program is configured to be connectable to an imaging device, and is executed by a computer including a display unit, whereby the computer is obtained from the imaging device. Operating means for selecting and operating the color space of the image, image processing means for performing color conversion processing in conformity with the color space selected by the operating means, and an image subjected to the color conversion processing in the image processing means. The image displayed on the display means is not adapted to the color space selected by the operation means, but is adapted to a color space matching the display characteristics of the display means. The image processing means so as to perform the color conversion process.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. In the following, a digital camera will be described as an example of the imaging apparatus.
[0018]
<1. First Embodiment>
<1-1. Main Configuration of Digital Camera>
FIGS. 1, 2 and 3 are views showing the main parts of a digital camera 1 according to an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a top view, and FIG. 3 is a rear view. I do. These drawings do not always conform to the triangular projection, and the main purpose is to conceptually illustrate the configuration of the main part of the digital camera 1.
[0019]
As shown in FIG. 2, the digital camera 1 includes an imaging unit 3 including a lens group with a macro function (hereinafter, also simply referred to as a “lens”) 30 that is a photographing lens. Further, the digital camera 1 has a zoom function, and the photographing magnification can be changed by rotating the zoom ring 33 or the like. Further, the digital camera 1 includes a macro switching lever 34, and can switch between macro shooting and normal shooting. A shutter button 9 is provided on the upper surface of the digital camera 1.
[0020]
On the upper surface of the digital camera 1, there is provided a mode switching dial 14 for switching and setting among "shooting mode", "reproduction mode", "setting mode" and "communication mode".
[0021]
The photographing mode is a mode for photographing, and the reproduction mode is a mode for reproducing and displaying photographed image data recorded on the memory card 8 on a display device such as the rear LCD 10 or the EVF 20.
[0022]
In the setting mode, a setting menu screen as shown in FIG. 11 is displayed on the rear LCD 10 or the like, and the user selects one color space according to the shooting purpose from among a plurality of color spaces based on the setting menu screen. This mode is for performing various function settings of the digital camera 1, such as selection and setting. For this reason, the digital camera 1 is configured so that a user can select and set a color reproduction range of an image recorded on the memory card 8 according to a photographing purpose.
[0023]
Further, the communication mode is a mode in which data is transferred to an external personal computer or the like via a USB terminal 226 provided on a side surface of the digital camera 1. A data panel 36 is further provided on the upper surface of the digital camera 1, and the setting state of various modes and the like are displayed on the data panel 36.
[0024]
As shown in FIG. 3, on the left side of the back of the digital camera 1, a live view display for displaying a subject in a moving image mode before main shooting, an after view display for displaying an image shot after main shooting, and A liquid crystal display (rear LCD) 10 and an electronic viewfinder (EVF) 20 are provided as display devices for performing reproduction display of a recorded image and the like. Each of the rear LCD 10 and the EVF 20 has a display size of 640 × 480, and an image is displayed in color.
[0025]
A control button 35 including cursor buttons (cross keys) U, D, L, R, and an execution button 32 is provided on the right side of the back of the digital camera 1. Various operations are performed using the control button 35. Is A menu button 37 is provided on the back of the digital camera 1. By pressing the menu button 37, various menus are displayed on the rear LCD 10.
[0026]
On the back of the digital camera 1, a display switching lever 31 is provided. By operating the display switching lever 31, an image is displayed on the rear LCD 10 or the EVF 20.
[0027]
On the side of the digital camera 1, there is provided a memory slot 81 in which a memory card 8 serving as a recording means for recording data such as images, programs and the like can be mounted.
[0028]
<1-2. Functional Block of Digital Camera 1>
FIG. 4 is a diagram illustrating functional blocks of the digital camera 1. Hereinafter, the functional blocks of the digital camera 1 will be described along the flow of signals.
[0029]
The digital camera 1 is provided with an image sensor (CCD) 303 behind the lens group 30. The imaging sensor 303 functions as an imaging unit that acquires image data of a subject, and is an area sensor in which RGB primary color transmission filters are arranged in a checkered pattern in pixel units, and is an all-pixel reading type.
[0030]
The image signal photoelectrically converted by the image sensor 303 is subjected to A / D conversion by the A / D converter 205, and then white balance correction is performed by the WB multiplier 206. Then, RGB pixel interpolation is performed by the interpolation circuit 207 to generate RGB three-channel data.
[0031]
The RGB image data generated by the interpolation circuit 207 is reproduced by an image processing circuit GP (color conversion matrix circuit 208, γ correction circuit 210, and color conversion circuit 212) which is a hardware circuit dedicated to color matching correction. Variable color matching processing is performed according to the reproduction characteristics of the device. The details will be described below.
[0032]
The color conversion matrix circuit 208 performs a color conversion matrix operation of the image sensor 303 on the RGB data generated by the interpolation circuit 207 using a 3 × 3 linear matrix 209. After the color conversion matrix calculation is performed, the gamma correction circuit 210 performs gradation correction for each of the RGB channels according to the reproduction device or the like by using the gamma table 211 corresponding to the gamma correction information.
[0033]
The color space of the color image data is converted into the sRGB color space or the Adobe RGB color space by the image processing circuit GP according to the setting of the user. Note that the sRGB color space and the AdobeRGB color space respectively correspond to the regions R2 and R4 shown in FIG. 10, and the sRGB color space has a narrower color reproduction range than the AdobeRGB color space.
[0034]
After the γ correction, the color conversion circuit 212 performs conversion from RGB to Y, Cr, and Cb channels using the color difference matrix 213 to separate the luminance signal Y and the color difference signals Cr and Cb.
[0035]
The luminance signal Y is separated in frequency band in the Y enhancer circuit 214. Then, for the high-frequency side of the luminance signal Y, after the signal level adjustment and contour correction and noise suppression are performed by base clip processing, the high-frequency luminance signal and the low-frequency luminance signal are added, The signal is input to the resizer circuit 219.
[0036]
The Y, Cr, and Cb signals are subjected to resolution conversion processing (reduction processing) for each channel by a resizer circuit 219 according to the internal state (operating state) of the digital camera 1.
[0037]
The image data resized to the display size 640 × 480 of the display device is displayed on the rear LCD 10 or the display device of the EVF 20 via the display switching unit 235. Here, the display device is specified according to the setting state of the display switching lever 31. For example, when the rear LCD 10 is selected, an image is displayed on the rear LCD 10.
[0038]
When the shutter button 9 is released, a captured image (main image) to be recorded is generated, and the image data is compressed by the image compression unit 261 according to the JPEG method or the like, and then written to the memory card 8. . When writing to the memory card 8, the image data (thumbnail image) resized to the display size of 640 × 480 of the display device is also compressed and recorded by the JPEG method or the like. This thumbnail image is an image exclusively used for reproduction display.
[0039]
The operation unit 250 includes various buttons and levers such as the shutter button 9, the display switching lever 31, and the control button 35 described above. The user performs an input operation on the digital camera 1 via the operation unit 250.
[0040]
The overall control unit 221 is a unit that organically controls each unit of the above-described camera and totally controls the operation of the digital camera 1, and includes a CPU and a RAM 221a serving as a microcomputer and a ROM 221b.
[0041]
The ROM 221b stores a control program, and stores a linear matrix 209 used in the color conversion matrix circuit 208, a γ table 211 used in the γ correction circuit 210, and a color difference matrix 213 used in the color conversion circuit 212. Is stored. Specifically, the linear matrix 209 holds four types of matrices Ms, Ma, Mas, and Mss. The γ table 211 holds four types of γ tables, γs, γa, γas, and γss. Holds four types of matrices Cs, Ca, Cas, and Css.
[0042]
Note that these matrices and tables may be stored in each hardware block instead of selectively using those stored in the ROM 221b of the overall control unit 221.
[0043]
In addition, these matrices and tables include the matrix Ms, the γ table γs, and the color difference matrix Cs when the sRGB color space is selected as the color space, and the matrix Ma when the AdobeRGB color space is selected as the color space. , Γ table γa, and color difference matrix Ca are used, respectively. Therefore, when the matrix Ms, the γ table γs, and the color difference matrix Cs are applied to the image processing circuit GP and color conversion processing is performed, a color image in the sRGB color space, which is a general-purpose color space, is generated, and the matrix Ma, the γ table When the color conversion processing is performed by applying γa and the color difference matrix Ca to the image processing circuit GP, a color image in the Adobe RGB color space, which is a color space with higher color reproducibility, is generated.
[0044]
The matrix Mas, the γ table γas, and the color difference matrix Cas, and the matrix Mss, the γ table γss, and the color difference matrix Css will be described later.
[0045]
The operation at the time of live view display, the operation at the time of image capture, and the operation at the time of image reproduction for the digital camera 1 having the above configuration will be described below.
[0046]
<1-3. Operation during Live View Display>
At the time of live view display (preview display) before the release operation, image data imaged by the image sensor 303 every 1/30 second is thinned out to 1/8 and output, and in synchronization with this, the image processing circuit GP and resizer The processing is executed in the circuit 219, and the subject image is displayed as a moving image on the rear LCD 10 or the EVF 20.
[0047]
At this time, irrespective of the color conversion setting of the user, the linear matrix 209 = Ms, the γ table 211 = Ms, and the color difference matrix 213 = Cs are set, and the image data captured by the image sensor 303 every 1/30 second is set. Is generated as a color image adapted to the sRGB color space, and the subject image is displayed on the rear LCD 10 or the EVF 20 as a moving image.
[0048]
Therefore, at the time of live view display, color conversion suitable for the display characteristics (color reproduction range) of the display device is performed, and a color image reproduced in an optimal state on the rear LCD 10 or EVF 20 is displayed.
[0049]
<1-4. Operation during image capture>
At the time of image capture accompanying the release operation (at the time of shooting the main image), the image data captured by the image sensor 303 is output to all pixels, and the image processing circuit GP performs the processing. The image data is stored in the RAM 221a by the image processing circuit GP. After temporarily storing the processed image data, the image data compressed by the image compression unit 261 is recorded on the memory card 8 as main image data (photographed image data) for recording.
[0050]
At this time, the linear matrix 209, the γ table 211, and the color difference matrix 213 are set as described above according to the user's color space setting, and the image data captured by the imaging sensor 303 is a color image ( (Main image) is temporarily stored in the RAM 221a.
[0051]
Then, the image data temporarily stored in the RAM 221a is provided to the resizer circuit 219, and the resizer circuit 219 performs resolution conversion.
[0052]
Here, internal processing in the digital camera 1 will be described for each of the case where the color space setting by the user is the sRGB color space and the case where the color space setting is the Adobe RGB color space.
[0053]
(1) When the user's color space setting is the sRGB color space.
[0054]
After the image data processed by the image processing circuit GP based on the color space setting by the user is temporarily stored in the RAM 221a, the image data whose resolution has been converted to 640 × 480 is transferred along the path Disp shown in FIG. And output it to the rear LCD 10 or EVF 20 (after-view display).
[0055]
Even if the resolution is converted to 640 × 480 in the resizer circuit 219, the color space of the image does not change, so that the image data in the sRGB color space is sent to the rear LCD 10 or the EVF 20, and the image conforming to the sRGB color space Is displayed as an after view.
[0056]
Only when the user instructs the deletion of the image during the after-view display, the main image data temporarily stored in the RAM 221a is deleted. Therefore, recording of the main image data on the memory card 8 is not performed.
[0057]
On the other hand, when the user does not give an instruction to delete the image during the after-view display, the image data used for the after-view display (that is, the sRGB color having a resolution of 640 × 480 generated by the resizer circuit 219). The image data of the space) is directly provided to the image compression unit 261 and is compressed to be thumbnail image data. The thumbnail image data is recorded on the memory card 8 together with the main image data. Note that the color space does not change even if the image compression is performed by the image compression unit 261, so that the thumbnail image is image data conforming to the sRGB color space.
[0058]
FIG. 5 is a diagram showing the concept of an image file recorded on the memory card 8. Unless a deletion instruction is given by the user, an image file 200 as shown in FIG. Be recorded.
[0059]
As shown in FIG. 5, in an image file 200, tag information 201 describing shooting conditions at the time of image capture, main image data 202 suitable for color space setting by a user, and exclusively used for image reproduction And thumbnail image data 203.
[0060]
When the user's color space setting is the sRGB color space, the tag information 201 records color space information indicating that the color space setting is the sRGB color space. By including the color space information in the tag information 201, it becomes possible to identify the color space setting of the main image data for image reproduction, for example.
[0061]
(2) When the user's color space setting is Adobe RGB color space.
[0062]
After the image data processed by the image processing circuit GP based on the color space setting by the user is temporarily stored in the RAM 221a, the image data whose resolution has been converted to 640 × 480 is transferred along the path FW shown in FIG. And transmitted to the color conversion matrix circuit 208 again. The path FW is a return path for guiding the output of the image processing circuit GP to the input again.
[0063]
At this time, each of the linear matrix 209, the γ table 211, and the color difference matrix 213 is set to Mas, γas, and Cas, and color image data conforming to the Adobe RGB color space is converted into color image data conforming to the sRGB color space. Is done. That is, the matrix Mas, the γ table γas, and the color difference matrix Cas are parameters for converting a color image conforming to the Adobe RGB color space into a color image conforming to the sRGB color space. Then, the image data in the sRGB color space generated by the image processing circuit GP passes through the resizer circuit 219 and is output along the path Disp, and the image in the sRGB color space is displayed on the rear LCD 10 or the EVF 20 (after-image). View display).
[0064]
Only when the user instructs the deletion of the image during the after-view display, the main image data temporarily stored in the RAM 221a is deleted.
[0065]
On the other hand, when the user does not give an instruction to delete an image during after-view display, the image data used for after-view display (that is, image data converted from the Adobe RGB color space to the sRGB color space) remains unchanged. The image data is supplied to the image compression unit 261 and is compressed to be thumbnail image data. Then, the thumbnail image data is recorded on the memory card 8 together with the main image data.
[0066]
At the time of recording on the memory card 8, as shown in FIG. 5, tag information 201 describing shooting conditions, main image data 202 adapted to a color space setting (Adobe RGB color space) by a user, and image data for exclusive use for image reproduction The image file 200 including the thumbnail image data 203 conforming to the sRGB color space used for is generated and recorded. If the user's color space setting is the Adobe RGB color space, the tag information 201 records that the color space setting is the Adobe RGB color space.
[0067]
<1-5. Operation during image playback>
At the time of image reproduction, the thumbnail image data of the image file selected by the user operating the cross key or the like is output along the path PLY, and is expanded by the image expansion unit 262. As described above, since the thumbnail image data is recorded on the memory card 8 in a state adapted to the sRGB color space, the color space does not change even if it is expanded by the image expansion unit 262.
[0068]
Then, the image data expanded by the image expansion unit 262 is input to the color conversion matrix circuit 208 again. At this time, the linear matrix 209, the γ table 211, and the color difference matrix 213 are set to Mss, γss, and Css, respectively, and color image data conforming to the sRGB color space is converted to color image data conforming to the sRGB color space. . That is, the linear matrix Mss, the γ table γss, and the color difference matrix Css are parameters that do not substantially perform color conversion. In other words, at this time, substantially no processing is performed in the image processing circuit GP, and the image processing circuit GP passes through the resizer circuit 219 and is output to the rear LCD 10 or the EVF 20 as it is.
[0069]
As a result, on the rear LCD 10 or the EVF 20, an image suitable for the display characteristics (color reproduction range) is reproduced and displayed, and it is possible to accurately grasp what color the image recorded on the memory card 8 is recorded. It is possible.
[0070]
As described above, the digital camera 1 of the present embodiment is configured to include the display device for displaying an image, and the operation unit 250 can select and operate the color space of the image obtained from the imaging sensor 303. It is. In the image processing circuit GP, a main image is generated by performing a color conversion process in conformity with the color space selected via the operation unit 250, and the main image can be compressed and recorded on the memory card 8. It is configured as follows. On the other hand, the image processing circuit GP performs a color conversion process (i.e., a process on the main image) for an image displayed on a display device such as the rear LCD 10 or the EVF 20 so as to conform to a color space selected by the user. Without performing the color conversion process performed by the display device, and performing the color conversion process that matches the color space that matches the display characteristics of the display device.
[0071]
For this reason, the digital camera 1 can perform color reproduction suitable for a display device when displaying an image, while enabling setting of a color reproduction range according to a photographing purpose.
[0072]
The color conversion processing performed on the display image is performed in a color space (for example, a narrower color space (for example, Adobe RGB color space)) that is narrower than the widest color space among color spaces that can be selected by the operation unit 250. (sRGB color space), and a general-purpose color space is reproduced in an image for display.
[0073]
The image displayed on the display device such as the rear LCD 10 or the EVF 20 is an image recorded on the memory card 8 as a thumbnail image of an image obtained from the imaging sensor 303. When reproducing and displaying, it is possible to perform color reproduction optimal for the display device of the digital camera 1, and it is possible to appropriately confirm a photographing result.
[0074]
Further, since the image displayed on the display device such as the rear LCD 10 or the EVF 20 is a preview image (live view image) for confirmation before photographing, when displaying the image in a state before photographing, the digital camera 1 uses The most suitable color reproduction for the display device can be realized. Therefore, it is possible to easily confirm the color of the subject before photographing.
[0075]
Further, since the image displayed on the display device such as the rear LCD 10 or the EVF 20 is also an after-view image for confirmation after shooting, it is optimal for the display device of the digital camera 1 when displaying the image obtained by shooting. Color reproduction becomes possible. For this reason, it is possible to appropriately confirm the photographing result immediately after the photographing.
[0076]
The image processing circuit GP generates a main image for recording in response to the release operation by performing a color conversion process in conformity with the color space selected from the operation unit 250, and then reduces the main image. , The color conversion processing is performed so as to be adapted to a color space that matches the display characteristics of the display device. Therefore, a display image showing a color space different from the main image is generated in conjunction with the main image generation. Therefore, at the time of image reproduction, it is not necessary to perform the color conversion processing, so that the processing can be sped up.
[0077]
Further, when generating an image in a color space different from that of the main image, which is a reduced image of the main image, the image processing circuit GP has parameters for color conversion processing applied when generating the main image. Is changed to a parameter for adapting to a color space that matches the display characteristics of the display device, and the color conversion processing is performed. In other words, the image processing circuit GP is configured to perform both color conversion processing for the main image and color space processing for generating an image in a color space different from the main image, and the common circuit is used. Has been planned. Therefore, as compared with a case where processing circuits are individually provided to generate images of the respective color spaces, the circuit scale can be reduced, and the cost and power consumption can be reduced.
[0078]
As described above, in the present embodiment, the case where an image is displayed on the display device provided in the digital camera 1 has been mainly described. However, the external display device is configured to be connectable to the display switching unit 235, and the external display is performed. The thumbnail image may be displayed on the device. In this case, the color conversion process performed on the thumbnail image is performed in a color space (eg, Adobe RGB color space) that is narrower than the widest color space (eg, Adobe RGB color space) among the color spaces that can be selected and set by the operation unit 250. (sRGB color space). That is, when a thumbnail image is displayed on an external display device, a more general-purpose color space is reproduced, so that it is possible to prevent an image having a significantly different color from being displayed.
[0079]
<2. Second Embodiment>
Next, a second embodiment will be described. In the first embodiment, the case where the digital camera 1 captures an image and records an image, and exemplifies the case where color conversion processing is performed inside the digital camera 1. However, it is also possible for the digital camera 1 to directly output an image captured by the image sensor 303 to an external device, perform color conversion processing on the external device, and perform image recording or the like. Therefore, the present embodiment exemplifies a case where an external device inputs an image from a digital camera and performs a color conversion process on the input image.
[0080]
FIG. 6 is a diagram illustrating a configuration of an image recording system according to the present embodiment. The image recording system 6 includes a personal computer and the like, and a digital camera 69 is electrically connected via a cable 68. Has become. Note that the cable 68 may include a wired or wireless network.
[0081]
The digital camera 69 has substantially the same configuration as that shown in the first embodiment, but the color conversion processing is not performed in the image processing circuit GP, and the image obtained from the image sensor 303 is directly passed through the cable 68. It is configured to be output to the image recording device 6.
[0082]
The image recording device 6 includes a processing unit 62 internally provided with a CPU, a memory, and the like, a display unit 61 for displaying an image, and an operation unit 63 such as a keyboard and a mouse for a user to perform an operation input. It is configured with. A cable 68 connected to a digital camera 69 is attached to the processing unit 62, and the processing unit 62 performs various data processing on image data input from the digital camera 69.
[0083]
Further, a program for achieving a data processing function equivalent to that of the digital camera 1 described in the first embodiment is installed in the processing unit 62, and the CPU in the processing unit 62 executes the program. By doing so, data processing such as color conversion processing is performed on the image input from the digital camera 69.
[0084]
Note that the program is stored in a recording medium 65 such as a CD-ROM, and the processing unit 62 may read the program stored in the recording medium 65 and install the program. The stored program may be read and executed directly without performing installation.
[0085]
In the image recording system configured as described above, a photographing instruction can be given from the image recording device 6 to the digital camera 69, and the image recording device 6 performs color conversion processing or the like on the image obtained from the digital camera 69. Is configured.
[0086]
7 to 9 are flowcharts showing the operation of the image recording device 6. First, when the image recording apparatus 6 is turned on and the program is started, a menu screen is displayed on the display unit 61 (step S1). On this menu screen, selection items such as "setting", "shooting", "playback", and "end" are displayed, and the user performs an operation of selecting one of these items via the operation unit 63 (step S2).
[0087]
When the “setting” item is selected on the menu screen (YES in step S3), processing unit 62 performs a color space selection setting based on the user's selection operation (step S7). The setting of the color space here is the setting of the color space when the captured image data is recorded in the processing unit 62. Information about the color space set at this time is temporarily recorded in a memory or the like in the processing unit 62.
[0088]
When the setting of the color space is completed, the display returns to the display of the menu screen again (step S1).
[0089]
When the “shooting” item is selected on the menu screen (YES in step S4), image recording device 6 performs a shooting process (step S8). The details of this photographing process are shown in the flowchart of FIG. When the photographing process starts, the processing unit 62 first determines whether the color space setting applied at the time of image recording is the Adobe RGB color space (step S81). If the color space setting is the Adobe RGB color space, a parameter for changing the color space setting of the display image to the sRGB color space is set (step S82), and an image display as a preview image before photographing is performed. (Step S83). On the other hand, if the color space setting is not the Adobe RGB color space, it is considered that the color space setting has already been set to the sRGB color space. Is displayed (step S83).
[0090]
In the image display process (step S83), the processing unit 62 instructs the digital camera 69 to repeatedly perform live view shooting, and the subject image before shooting is displayed in a moving image. At this time, since an image in the sRGB color space that is optimal for the display characteristics of the display unit 61 is displayed, the user can accurately grasp the color of the subject image in the preview state.
[0091]
When the user gives a shooting instruction from the operation unit 63, the processing unit 62 gives a capture instruction to the digital camera 69 (step S84). Note that the image display processing for live view (step S83) is repeatedly executed until a shooting instruction is given.
[0092]
When the capture instruction is given, the processing unit 62 determines whether or not the color space setting applied at the time of image recording is the Adobe RGB color space (step S85). Then, when the color space setting is the Adobe RGB color space, a parameter for setting the color space setting of the recording image to the Adobe RGB color space is set (step S87). On the other hand, when the color space setting is not the Adobe RGB color space, it is considered that the color space setting is set to the sRGB color space. Therefore, the parameter for setting the color space setting of the recording image to the sRGB color space is considered. Is set (step S86).
[0093]
Then, the image data obtained from the digital camera 69 in response to the capture instruction is subjected to color conversion processing by applying the parameters set in step S86 or S87, and image compression or the like is appropriately performed. Image recording is performed on a magnetic disk device or the like provided inside (step S88). The details of the recording process are the same as those described in the first embodiment. An image file containing a thumbnail image and tag information is created together with the main image, and the thumbnail image conforms to the sRGB color space. Is performed and recorded.
[0094]
As a result, in the image recording device 6, when an image is displayed on the display unit 61, color reproduction suitable for a display device is performed while enabling setting of a color reproduction range according to a shooting purpose. I have.
[0095]
Next, when the "playback" item is selected on the menu screen (YES in step S5), the image recording device 6 performs a playback process (step S9). The details of the reproduction process are shown in the flowchart of FIG. When the reproduction process is started, the processing unit 62 first determines whether to reproduce a thumbnail image or a main image (step S91). This determination is made based on the operation content of the user, and when the user instructs to reproduce the thumbnail image, YES is determined.
[0096]
When the user instructs to reproduce the thumbnail image, the process proceeds to step S92, where the thumbnail image recorded together with the main image is read, and the display processing on the display unit 61 is performed. Since the thumbnail images are recorded in the sRGB color space, the images are displayed in a color space that matches the display characteristics of the display unit 61. In step S92, a plurality of thumbnail images may be displayed on the display unit 61 in a list format.
[0097]
Next, when the user instructs reproduction of the main image, the process proceeds to step S93, and it is determined whether the main image to be reproduced is recorded in Adobe RGB color space (step S93). The processing unit 62 can determine the color space of the main image by referring to the tag information of the image file to be reproduced.
[0098]
If the color space setting is the Adobe RGB color space, a parameter for changing the color space setting of the main image to the sRGB color space is set (step S94). For example, by setting each of the linear matrix, the γ table, and the color difference matrix described in the first embodiment to Mas, γas, and Cas, the color image data adapted to the Adobe RGB color space is converted to the sRGB color space. That is, the image data is converted into the suitable color image data.
[0099]
Then, by displaying the main image converted into the sRGB color space on the display unit 61, the image reproduction of the main image recorded in the processing unit 62 is performed (step S95).
[0100]
On the other hand, if the color space of the main image is the sRGB color space in step S93 (NO in step S93), the image display process (step S95) is performed as it is, and the main image is reproduced and displayed. .
[0101]
In the image display process (step S95), the image data may be resized as needed.
[0102]
Next, when the “end” item is selected on the menu screen (YES in step S6), the processing in image recording device 6 ends.
[0103]
As described above, the image recording device 6 of the present embodiment is configured to be connectable to the digital camera 1 and includes the display unit 61 capable of displaying an image obtained from the digital camera 1. Then, the processing unit 62 is configured to perform a color conversion process adapted to the color space by a user's selection operation on the image obtained from the digital camera 1 and record the image obtained as a result. Further, the processing unit 62 does not adapt the image displayed on the display unit 61 to the color space selected via the operation unit 63, but adapts the image to the color space that matches the display characteristics of the display unit 61. Color conversion processing. For this reason, in the image recording device 6, it is possible to change the color reproduction range according to the purpose when recording an image, while performing color reproduction suitable for a display device when displaying an image. be able to.
[0104]
<3. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described contents, and various modifications can be applied.
[0105]
For example, in the above description, a case where two types of color spaces, an AdobeRGB color space and an sRGB color space, can be set as a color space setting for a color image is exemplified, but the number of types may be further increased. Further, the color space defined by the present invention is not limited to the relationship between the Adobe RGB color space and the sRGB color space, and can be applied to a new color space that will be defined in the future. Of course.
[0106]
Further, in the above description, a digital camera is exemplified as the imaging device. However, the present invention is not limited to this, and another imaging device such as a mobile phone with an imaging function may be used.
[0107]
The contents described above include the following inventive concept.
[0108]
(1) In the imaging device according to claim 2, when an external display device is connectable and the thumbnail image is also displayed on the external display device, a color conversion process performed on the thumbnail image Is performed in a color space that is narrower than the widest color space among the color spaces that can be selected and set by the operation unit.
[0109]
Thereby, when the thumbnail images are displayed on the external display device, a more general-purpose color space is reproduced, so that it is possible to prevent an image having a significantly different color from being displayed.
[0110]
(2) In the imaging device according to claim 1, the image processing unit generates a main image by performing a color conversion process in conformity with a color space selected by the operation unit, and then generates the main image. An image pickup apparatus, characterized in that a reduced image is subjected to a color conversion process in conformity with a color space that matches display characteristics of the display means.
[0111]
As a result, an image for display indicating a color space different from the main image is generated in conjunction with the main image generation, and it is not necessary to perform a color conversion process at the time of image reproduction. Can be achieved.
[0112]
(3) In the imaging device according to (2), when the image processing unit generates a reduced image of the main image and an image in a color space different from the main image, the image processing unit includes the image processing unit. An imaging apparatus, wherein parameters for color conversion processing applied when generating an image are changed to parameters for adapting to a color space that matches display characteristics of the display means.
[0113]
Thereby, the image processing means is configured to perform both the color conversion processing for the main image and the color space processing for generating an image in a color space different from the main image, and the circuit is shared. . Therefore, as compared with a case where processing circuits are individually provided to generate images of the respective color spaces, the circuit scale can be reduced, and the cost and power consumption can be reduced.
[0114]
(4) The imaging device according to claim 1, wherein the image displayed on the display unit is an after-view image for confirmation after photographing.
[0115]
Accordingly, when displaying an image obtained by photographing, color reproduction optimal for the display unit of the imaging device can be performed. For this reason, it is possible to appropriately confirm the photographing result immediately after the photographing.
[0116]
【The invention's effect】
As described above, according to the first aspect of the present invention, the color conversion processing is performed so that the color space of the image obtained by the imaging means is adapted to the color space selected by the operation means, and the color conversion processing is performed. The image displayed on the display means is configured not to be adapted to the color space selected by the operation means, but to be adapted to the color space matched to the display characteristics of the display means. Then, the color conversion processing is performed. For this reason, the imaging device can set the color reproduction range according to the shooting purpose, and can perform color reproduction suitable for the display unit when displaying an image.
[0117]
According to the second aspect of the present invention, the image displayed on the display unit is an image recorded on the recording unit as a thumbnail image of an image obtained from the imaging unit. When reproducing and displaying, it is possible to perform color reproduction optimal for the display means of the imaging device, and it is possible to appropriately confirm a photographing result.
[0118]
According to the third aspect of the present invention, since the image displayed on the display means is a preview image for confirmation before photographing, when displaying the image in a state before photographing, an optimum color for the display means is displayed. Reproduction becomes possible. Therefore, it is possible to easily confirm the color of the subject before photographing.
[0119]
According to the fourth aspect of the present invention, the color space of the image obtained from the imaging device is adapted to the color space selected by the operation unit, and the color conversion process is performed. The image is displayed on the display means, and is not adapted to the color space selected by the operation means, but is adapted to the color space matching the display characteristics of the display means. The image recording device can set the color reproduction range according to the shooting purpose because it is configured to perform processing, and can perform color reproduction suitable for display means when displaying images. It is.
[0120]
According to the fifth aspect of the present invention, it is possible to realize a computer that can set a color reproduction range according to a shooting purpose and can perform color reproduction suitable for a display unit when displaying an image. can do.
[Brief description of the drawings]
FIG. 1 is a front view of a digital camera according to a first embodiment.
FIG. 2 is a top view of the digital camera.
FIG. 3 is a rear view of the digital camera.
FIG. 4 is a diagram showing functional blocks of the digital camera.
FIG. 5 is a diagram showing the concept of an image file recorded on a memory card.
FIG. 6 is a diagram illustrating a configuration of an image recording system according to a second embodiment.
FIG. 7 is a flowchart illustrating an operation of the image recording apparatus.
FIG. 8 is a flowchart illustrating an operation of the image recording apparatus.
FIG. 9 is a flowchart illustrating an operation of the image recording apparatus.
FIG. 10 is a general xy chromaticity diagram.
FIG. 11 is a diagram illustrating an example of a setting menu screen related to a color space.
[Explanation of symbols]
1,69 Digital camera (imaging device)
6 Image recording device
8 Memory card (recording means)
10. Rear LCD (display means)
20 EVF (display means)
209 Linear matrix
221 gamma table
213 Color difference matrix
221 Overall control unit
221a RAM
221b ROM
250 operation unit (operation means)
GP image processing circuit (image processing means)

Claims (5)

  1. An imaging device comprising a display unit for displaying an image,
    Imaging means for capturing an image of a subject;
    Operating means for selecting and operating a color space of an image obtained by the imaging means;
    Image processing means for performing color conversion processing in conformity with the color space selected by the operation means,
    Recording means for recording an image subjected to color conversion processing in the image processing means,
    The image processing unit does not adapt the image displayed on the display unit to the color space selected by the operation unit, but adapts the image to a color space that matches the display characteristics of the display unit. An imaging device that performs processing.
  2. The imaging device according to claim 1,
    An image pickup apparatus, wherein the image displayed on the display means is an image recorded in the recording means as a thumbnail image of an image obtained from the image pickup means.
  3. The imaging device according to claim 1,
    The image pickup apparatus according to claim 1, wherein the image displayed on the display unit is a preview image for confirmation before photographing.
  4. An image recording device configured to be connectable to an imaging device and including a display unit capable of displaying an image obtained from the imaging device,
    Operating means for selecting and operating a color space of an image obtained from the imaging device;
    Image processing means for performing color conversion processing in conformity with the color space selected by the operation means,
    Recording means for recording an image subjected to color conversion processing in the image processing means,
    The image processing unit does not adapt an image displayed on the display unit to a color space selected by the operation unit, but adapts the image to a color space that matches display characteristics of the display unit. An image recording device that performs processing.
  5. The computer is configured to be connectable to an imaging device, and is executed by a computer including a display unit.
    Operating means for selecting and operating a color space of an image obtained from the imaging device,
    Image processing means for performing color conversion processing in conformity with the color space selected by the operation means, and recording means for recording an image subjected to color conversion processing in the image processing means;
    Function as
    For the image displayed on the display means, without performing the color conversion selected by the operation means, to perform a color conversion process to match the color space that matches the display characteristics of the display means, A program for causing the image processing means to function.
JP2002254448A 2002-08-30 2002-08-30 Photographing device, image recording device, and program Pending JP2004096400A (en)

Priority Applications (1)

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