WO2003003716A1 - Dispositif, procede, programme de traitement d'image et support d'enregistrement - Google Patents
Dispositif, procede, programme de traitement d'image et support d'enregistrement Download PDFInfo
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- WO2003003716A1 WO2003003716A1 PCT/JP2002/006335 JP0206335W WO03003716A1 WO 2003003716 A1 WO2003003716 A1 WO 2003003716A1 JP 0206335 W JP0206335 W JP 0206335W WO 03003716 A1 WO03003716 A1 WO 03003716A1
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- WIPO (PCT)
- Prior art keywords
- color correction
- image processing
- color
- correction table
- image
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/001—Texturing; Colouring; Generation of texture or colour
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6027—Correction or control of colour gradation or colour contrast
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Definitions
- the present invention relates to image processing on an image input signal when converting the color space of the image input signal into the color space of an image output device.
- the color gamut is different for each device such as scanner, monitor, printer, projector, etc. Therefore, how to absorb the difference between the color reproduction regions and perform color reproduction becomes a problem. For example, when adjusting the color characteristics of a liquid crystal projector to a color standard such as sRGB, first compare the color gamuts of the two to determine how to reproduce the target color characteristics in the color gamut of the liquid crystal projector. One matching method). However, since color standards such as sRGB are generally created based on the color characteristics of CRT displays, comparing the color gamut of a projector with greenish color characteristics to that of white The shade of gray (the direction of the gray axis) is different.
- the present invention is an image processing apparatus that performs desired image processing on an input signal using a color correction table and outputs the processed signal to an image output apparatus, and the luminance of white output from the image output apparatus is provided. And a color correction table that varies the conversion amount of the white point according to. In this way, by bringing the chromaticity of the target white point closer to the chromaticity of white of the image output device, it is possible to avoid the influence of eye adaptation.
- the present invention is also the image processing device, wherein the target white point after the conversion is made closer to the white point of the image output device as the luminance of white output from the image output device increases. This is because the human eye is more adaptable to bright light than dark light.
- the present invention is an image processing apparatus that performs desired image processing on an input signal using a color correction table and outputs the processed signal to an image output apparatus, A color correction table giving priority to color reproduction for performing color correction capable of faithful color reproduction; and a color correction table giving priority to brightness for performing color correction giving priority to brightness.
- the target white point after the conversion by the color correction table is approximated to the white point of the image output device.
- the present invention is the image processing apparatus, wherein the image processing apparatus is configured to switch between the color correction table giving priority to brightness and the color correction table giving priority to color reproduction in accordance with an input signal.
- the present invention uses a color correction table that varies the white point conversion amount according to the white luminance output from the image output device, performs desired image processing on the input signal, and outputs the processed signal to the image output device. It is configured to Further, the present invention uses a color correction table giving priority to color reproduction for performing color correction capable of faithful color reproduction, and a color correction table giving priority to brightness for performing color correction giving priority to brightness.
- the present invention uses a color correction table that varies the conversion amount of a white point according to the luminance of white output from an image output device to execute desired image processing to be performed on an input signal in a convenient manner. It is a program to make it happen. Further, the present invention provides a color reproduction for performing color correction capable of faithful color reproduction. An image to be subjected to a desired image processing on an input signal and output to an image output device by using a current priority color correction table and a brightness priority color correction table for performing a brightness priority color correction. A program for causing a computer to execute processing in an entire process, and causes a computer to execute image processing for bringing a target white point after conversion by the color correction table giving priority to color reproduction closer to a white point of an image output device.
- the present invention is a recording medium readable by a computer recording the program. Further, the present invention is a recording medium readable by a computer recording a color correction table for changing a conversion amount of a white point according to a luminance of white output from an image output device.
- FIG. 1 is a functional block diagram of a color correction table generation device according to an embodiment of the present invention
- FIG. 2 is a schematic block diagram showing a specific hardware configuration example of a color correction table generation device and an image processing device according to the present invention.
- FIG. 3 is a functional block diagram of the image processing apparatus according to the first embodiment of the present invention.
- FIG. 4 is a flowchart for explaining the operation of the image processing device 20B.
- FIG. 5 is a flowchart for explaining a color correction table generation processing program executed by the first color correction table generation device 2OA.
- FIG. 6 is a flowchart for explaining the output value calculation processing program of the three-dimensional color correction table (3D—LUT).
- FIG. 7 is a functional block diagram of the image processing apparatus according to the second embodiment of the present invention.
- FIG. 8 is a flowchart for explaining the operation of the image processing device 20C.
- FIG. 9 is a diagram for explaining a target white point necessary for generating a color correction table giving priority to color reproduction.
- FIG. 1 is a functional block diagram of a color correction table generation device that gives priority to color reproduction
- FIGS. 3 and 7 are functional block diagrams of an image processing device according to the present invention.
- FIG. 2 is a schematic block diagram showing a specific hardware configuration example of the color correction table generation device and the image processing device.
- a combination system is used as an example of hardware for realizing the color correction table generation device and the image processing device.
- FIG. 2 is a block diagram showing the computer system.
- This computer system is equipped with a SKYANA 1 la, a digital still camera 1 lb, and a video camera 1 lc as image input devices, and is connected to the combination main body 12.
- Each input device is an image data that expresses the image by dots-like pixels. Evening can be generated and output to the computer body 12, where the same image data can represent approximately 1.670 million colors by displaying each of the three primary colors of RGB in 256 gradations. Has become.
- a floppy disk drive 13a as an external auxiliary storage device, a hard disk 13b, and a CD-ROM drive 13c are connected to the computer main unit 12, and a hard disk 13b is connected to the system.
- the main programs are recorded and necessary programs can be read from a floppy disk or CD-ROM.
- a modem 14a is connected as a communication device for connecting the computer body 12 to an external network or the like.
- the modem 14a is connected to the external network via the same public communication line, and the software code is connected. Evening can be introduced by opening the door down.
- the modem 14a accesses the outside via a telephone line, but a configuration in which the network is accessed via a LAN adapter is also possible.
- a keyboard 15a and a mouse 15b for operating the computer body 12 are also connected.
- it has a display 17a, a power printer 17b, and a projector 1c as image output devices.
- the display 17a has a display area of 800 pixels in the horizontal direction and 600 pixels in the vertical direction, and it is possible to display the above mentioned 1670,000 colors for each pixel. I have. This resolution is merely an example, and can be changed as appropriate, such as 64 ⁇ 480 pixels or 120 ⁇ 64 pixels.
- the color printer 17b is an inkjet printer, and C Images can be printed by attaching dots to printing media as media using four color inks of MYK.
- High-density printing such as image density of 360 x 360 dpi or 720 x 720 dpi, is possible, but the gradation expression is expressed in two gradations, such as whether or not to add color ink. ing.
- a predetermined program is executed in the computer main body 12 to display or output the image on the image output device.
- the operating system (OS) 12a running as a basic program has a display driver (DSPDRV) 1 2 that performs display on the display 17a.
- DSPDRV display driver
- the computer main unit 12 includes a CPU 12 e, a RAM 12 f, a R 1M 12 g, and a 1 ⁇ 12 h, and a CPU that executes arithmetic processing.
- 1 2 e can use RAM 12 f as temporary work area setting storage area or program area.
- the basic program written in the ROM 12g is executed as appropriate to control external devices and internal devices connected via the IZO 12h.
- the application 12 d is executed on the operating system 12 a as a basic program.
- the processing content of the application 1 2d is various, and it monitors the operation of the keyboard 15a and mouse 15b as operation devices, and when operated, appropriately controls various external devices and performs the corresponding operations.
- the processing apparatus is realized as a computer system, but such a combination system is not necessarily required, and the same image processing requires image processing according to the present invention. Any system can be used. For example, a system may be used in which an image processing apparatus for performing image processing according to the present invention is incorporated in a digital still camera, and printing is performed using the image processed image data.
- a scanner or digital printer is also required. It is also possible to adopt a configuration in which image processing according to the present invention is automatically performed on image data input via a still camera, a modem, or the like, and printing processing is performed. In addition, it can be naturally applied to various devices that handle image data, such as color facsimile machines, color copiers, and projectors.
- Image processing control program
- the image processing control program according to the present invention is usually distributed in a form readable by a computer 12 on a recording medium such as a floppy disk or a CD-ROM.
- the program is read by a media reader (CD-R0M drive 13c, floppy disk drive 13a, etc.) and installed on the hard disk 13b.
- the CPU is configured to read a desired program from the hard disk 13b as appropriate and execute a desired process.
- the image processing control program itself according to the present invention also constitutes a part of the present invention.
- Color correction table generator generator
- the color correction table generation device 20A shown in FIG. 1 generates a color correction table capable of more natural color reproduction (color correction table giving priority to color reproduction).
- the color correction table generation device 2OA includes a target color space and each parameter setting unit 20e, a reference white point calculation unit 20f, a first conversion unit 20g, Second conversion unit 20h, third conversion unit 20i, fourth conversion unit 20j, fifth conversion unit 20k, sixth conversion unit 201, and color correction LU And a T storage unit 20b. Details of the processing of each component will be described later.
- the color correction table generation processing program executed by the color correction table generation device 20A shown in FIG. 1 will be described with reference to FIG. 5 and FIG. In this embodiment, a case where the image output device is a projector will be described. Before executing the color correction table generation processing program, it is necessary to measure the following projector color characteristic data in advance. That is,
- FIG. 5 is a flowchart for explaining a color correction table generation processing program executed by the first color correction table generation device 2OA. Determination process of target color space and each parameter (S20)
- the target color space and each parameter determination unit 20 e of the first color correction table generation device 20 A determines each parameter of the target color space and the conversion matrix ( S20). First, the chromaticity coordinates of each of the white (W), red (R), green (G), and blue (B) colors in the target color space after the conversion are determined. In the case of a color correction table that gives priority to color reproduction, the target color space is sRGB, so each chromaticity coordinate is
- a partial adaptation parameter D and a mating limit brightness L max are determined. Details of these parameters will be described later.
- the target color space and each parameter determining unit 20e calculates a matrix Mt used for conversion from RtGtBt to XtYtZt (S20). This conversion is based on the definition of the target color space, and Mt is a matrix as shown in the following equation (2).
- the target color space and each parameter determining unit 20e calculates a matrix Md used for conversion from RdGdBd to XdYdZd (S20). This conversion is based on the color characteristics of the projector, and Md is a matrix as shown in the following equation (3).
- the target color space and each parameter determining unit 20e calculates a matrix Mwp used for conversion from XtYtZt to Xt'Yt'Zt '(S20). If the color characteristics of the projector are completely matched to the target color characteristics such as sRGB, there is a problem that the image is often felt as a reddish-blur image that has been over-corrected. This is because, while watching the image before color correction, the sense of eyes has been adjusted so that the original greenish white feels natural white.
- the reason why the value of D is increased as the brightness of the white of the projector increases is that the human eye can adapt to bright light more easily than dark light.
- the daylight locus shown in Fig. 9 is a typical daylight chromaticity locus specified by the CIE (International Commission on Illumination). Chromaticity standard light such as D 65 is a white point of D 50 and s R GB is present on this trajectory.
- Lwt, Mwt, and Swt in Equations (6) to (8) are the response amounts of the cone in white in the target color space, and the tristimulus values Xwt, Ywt, and Zwt of white in the target color space are expressed by the following equations. It is obtained by substituting into (5).
- Lwd, Mwd, and Swd in Expressions (6) to (8) are cone response amounts at the white tristimulus values Xwd, Ywd, and Zwd of the projector.
- the reference white point calculator 20f calculates the reference white point as follows (S22).
- the converted white is “the brightest 6500K color that can be output in the project”. Specifically, this is realized by setting the reference white point XnYnZn in the conversion from Ld * ud * vd * of S38 to XdYdZd, which will be described later, as a converted white tristimulus value.
- the reference white point XnYnZn is also obtained in advance. Assuming that the output value of the projector at the reference white point XnYnZn is RnGnB ⁇ , the output value between XnYnZn and RnGnBn is
- the first to sixth conversion units 20 g to 201 of the color correction table generation device 2 OA output the input values Rt of the three-dimensional color correction table (3D—LUT).
- the output value RdGdBd for GtBt is calculated (S24).
- the process of calculating the output value of the three-dimensional color correction table (3D-LUT) will be described in further detail with reference to FIG.
- the process in S30 is performed by the first converter 20g
- the process in S32 is performed by the first converter 20h
- the process in S34 is performed by the first converter 20i.
- the processing in S36 is performed by the first converter 20j
- the processing in S38 is performed by the first converter 20k
- the processing in S40 is performed by the first converter 2k.
- the first conversion unit 20g converts the input value RtGtBt to the three-dimensional color correction table into the tristimulus value XtYtZt based on the definition of the target color space (S30). Since sRGB is the target color space in the color correction table giving priority to color reproduction, it is calculated by the following equations (14) and (15) based on the definition of sRGB.
- the third conversion unit 20i expresses the color of the target color space and the color of the projector on the CIEL UV space, which is a uniform color space, so that they can be associated with each other by the following expression ( 18): 15Yt , + 3Zt ')-9Ywt' / (Xwt '+ 15Ywt' + 3Zwt ')] to convert the tristimulus value Xt'Yt'Zt' of the target color space to the coordinate value Lt * of the color compression space CIE LU V Conversion to ut * vt * is performed (S34).
- Xwt ,, Ywt ', Zwt' in the equation (18) are ⁇ !
- V * d V * t + (V * kd ⁇ V *
- Lkd *, ukd *, vkd * are the coordinates of the projector black in CIE LUV space.
- the matching limit brightness L max is set to 100.
- Md- 1 is the inverse of the matrix Md shown in equation (3).
- Rd, Gd, Bd is less than 0, Rd, Gd, Bd is set to zero, and if Rd, Gd, Bd> 255, 255 is set.
- the values of Rd, Gd, and Bd obtained here become the final 3D color correction table data.
- S26 the final three-dimensional color correction table
- S28 the correction LUT storage unit 20b
- the conversion from XtYtZt to Xt'Yt'Zt ' is performed to avoid the effects of the adaptation of the eye sensation, and the target white point Image processing device that can generate a color correction table capable of more natural color reproduction because processing is performed to bring the chromaticity of the color close to the white chromaticity of the project
- the image processing device 20B performs desired image processing on the RGB image input data, and outputs the processed image data to the image output device 30.
- the image data represents the strength of each element color while separating the color image for each of the predetermined element colors, and is a chromatic color represented by gray when mixed at a predetermined ratio. Color and black color.
- the image output device 30 such as a projector or a display performs color reproduction based on RGB data will be described.
- the image processing device 20B includes a color correction LUT storage unit 2Ob that stores at least a color correction table with priority on color reproduction generated by the color correction table generation device 2OA; a color correction LUT selection unit 2 0 Reads the color correction table (LUT) selected by c from the color correction LUT storage unit 2 Ob, and refers to the read color correction LUT to read RGB data R 'G'B' A color correction unit 20a for converting the image data into an entire image; Next, the operation of the image processing device 20B will be described with reference to FIG. 4. o As shown in FIG.
- Step 72 when the user instructs the start of image output (step 70), a predetermined three-dimensional When the color correction LUT is selected, (Step 72, Yes), the predetermined three-dimensional color correction LUT is read from the color correction LUT storage unit 20c and read into the RAM (step 74). Then, the three-dimensional color correction LUT is incorporated into the color correction unit 20b (step 76), and image processing is performed by interpolation with reference to the three-dimensional color correction LUT, and image output processing is performed (step 78).
- the user is configured to be able to select a desired LUT using the color correction LUT selection unit 20i according to his / her preference or use.
- the chromaticity of the target white point is reduced by using the white color of the projector in order to avoid the influence of the adaptation of the eye sensation. Since the image processing is performed using the color correction table that gives priority to color reproduction, which performs processing that approximates the chromaticity of the image, more natural color reproduction is possible.
- Second embodiment Second embodiment
- the image processing device 20C performs desired image processing on the RGB image input data, and outputs the processed image data to the image output device 30.
- the image data is a color image which is color-separated for each predetermined element color and expresses the strength of each element color, and is a chromatic color mixed at a predetermined ratio. Sometimes it consists of an achromatic color represented by gray and black.
- the image processing device 20C is generated by the color correction table generation device 2OA.
- Color correction LUT storing at least the generated color correction table that prioritizes color reproduction and at least the brightness-priority color correction template that is configured to match colors without impairing the brightness range of the projector Unit 20b; reads the selected color correction table (LUT) from the color correction LUT storage unit 20b, and refers to the read color correction LUT and supplies it from the image data generation unit 20m. And a color correction unit 20a for converting the RGB data to be converted into R'G'B 'data.
- the RGB data supplied from the image data generation unit 2 Om is data that is preferable to faithfully reproduce colors such as a natural image
- a predetermined data determination flag is set, and the RGB data is When it is preferable to perform color reproduction with priority on brightness, such as data for presentation, it is configured such that a predetermined data determination flag is not set.
- the operation of the image processing device 20C will be described with reference to FIG. As shown in FIG. 4, when the start of image output (step 80) is instructed by the user, the color correction unit 20a transmits the predetermined data of the data supplied from the image data generation unit 2Om. It is determined whether or not the data determination flag is set (step 82).
- Step 82 If the predetermined data determination flag is on (Step 82, Yes), the three-dimensional color correction table with priority on color reproduction is read from the color correction table storage unit 20b and read into the RAM (Step 82). (Step 84) If the predetermined data determination flag is not set (step 82, N 0), the brightness-priority three-dimensional color correction table is read from the color correction table storage unit 20b and read into the RAM. (Step 85). Then, the read three-dimensional color correction table is stored in the color correction unit 20a. Embedding (step 88), image processing is performed by interpolation with reference to the three-dimensional color correction LUT, and image output processing is performed (step 88). The above steps 82 to 88 are performed until the data is completed (step 90).
- a color correction table that gives priority to brightness or a color correction table that gives priority to color reproduction is selected according to whether or not the data determination flag is set. And more appropriate color reproduction can be performed depending on the image.
- the chromaticity of the target white point is adjusted in order to avoid the influence due to the adaptation of the eyes. Since the process that approximates the white chromaticity of the projector is performed, more natural color reproduction is possible.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP02741285A EP1401191A4 (en) | 2001-06-28 | 2002-06-25 | DEVICE, METHOD, IMAGE PROCESSING PROGRAM, AND RECORDING MEDIUM |
Applications Claiming Priority (2)
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JP2001-196841 | 2001-06-28 | ||
JP2001196841A JP3832626B2 (ja) | 2001-06-28 | 2001-06-28 | 画像処理装置、画像処理方法、プログラムおよび記録媒体 |
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US (1) | US7180632B2 (ja) |
EP (1) | EP1401191A4 (ja) |
JP (1) | JP3832626B2 (ja) |
CN (1) | CN1229970C (ja) |
WO (1) | WO2003003716A1 (ja) |
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JP2002262304A (ja) * | 2001-03-06 | 2002-09-13 | Seiko Epson Corp | 画像表示装置、画像処理方法およびプログラム |
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US5502580A (en) * | 1993-10-06 | 1996-03-26 | Fuji Photo Film Co., Ltd. | Color reproduction system |
US5530540A (en) * | 1994-08-03 | 1996-06-25 | Wyatt Technology Corporation | Light scattering measurement cell for very small volumes |
JPH09266538A (ja) | 1996-03-28 | 1997-10-07 | Fujitsu Ltd | 画像処理装置の色合わせ方法及び画像処理装置 |
JP2000032282A (ja) | 1998-07-08 | 2000-01-28 | Matsushita Electric Ind Co Ltd | 色再現領域圧縮装置 |
JP4136217B2 (ja) * | 1998-08-27 | 2008-08-20 | キヤノン株式会社 | 投射型表示装置 |
JP2001143065A (ja) | 1999-11-12 | 2001-05-25 | Canon Inc | 画像処理方法および記録媒体 |
KR100458760B1 (ko) * | 2000-08-29 | 2004-12-03 | 가부시끼가이샤 코에이 | 집단 캐릭터 표시방법, 기록매체 및 게임장치 |
JP2002204374A (ja) * | 2000-10-23 | 2002-07-19 | Seiko Epson Corp | 色補正テーブル生成方法、画像処理装置、画像処理方法および記録媒体 |
JP3744808B2 (ja) * | 2001-03-28 | 2006-02-15 | セイコーエプソン株式会社 | 画像処理装置、画像処理方法、プログラムおよび記録媒体 |
JP3832626B2 (ja) * | 2001-06-28 | 2006-10-11 | セイコーエプソン株式会社 | 画像処理装置、画像処理方法、プログラムおよび記録媒体 |
JP3841151B2 (ja) * | 2001-06-28 | 2006-11-01 | セイコーエプソン株式会社 | 画像処理装置、画像処理方法、プログラムおよび記録媒体 |
JP4521800B2 (ja) * | 2001-07-19 | 2010-08-11 | 株式会社リコー | 画像形成装置 |
US7304766B2 (en) * | 2002-04-01 | 2007-12-04 | Hewlett-Packard Development Company, L.P. | Method and apparatus for data adjustment |
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2001
- 2001-06-28 JP JP2001196841A patent/JP3832626B2/ja not_active Expired - Fee Related
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2002
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- 2002-06-25 WO PCT/JP2002/006335 patent/WO2003003716A1/ja active Application Filing
- 2002-06-25 CN CNB028022882A patent/CN1229970C/zh not_active Expired - Fee Related
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JPH10215385A (ja) * | 1997-01-30 | 1998-08-11 | Fuji Photo Film Co Ltd | 画像の色変換方法 |
JPH10322561A (ja) * | 1997-05-20 | 1998-12-04 | Ricoh Co Ltd | 色変換装置 |
JP2002262304A (ja) * | 2001-03-06 | 2002-09-13 | Seiko Epson Corp | 画像表示装置、画像処理方法およびプログラム |
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Also Published As
Publication number | Publication date |
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EP1401191A4 (en) | 2007-07-04 |
CN1229970C (zh) | 2005-11-30 |
US20030053088A1 (en) | 2003-03-20 |
US7180632B2 (en) | 2007-02-20 |
EP1401191A1 (en) | 2004-03-24 |
CN1465175A (zh) | 2003-12-31 |
JP2003018416A (ja) | 2003-01-17 |
JP3832626B2 (ja) | 2006-10-11 |
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