JP2010114748A - Image processor, image processing method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine color to be reproduced by an image recording device considering three attributes of color of image data inputted from an image input device and three attributes at image data display on an image display device. <P>SOLUTION: A display color format converting portion 107 converts sYCC image data from an image storage device 101 into sRGB image data. A display color three-attribute calculating portion 108 calculates three color attributes (H1, L1, S1) based on the image data (sRGB), and an original image three-attribute color calculating portion 109 calculates the three attributes (H2, L2, S2) of color based on the image data (sYCC). A reproduced color three-attribute determining portion 110 weights and sums the three color attributes calculated by the calculating portions 108 and 109 for output, and a recording color gamut mapping portion 112 converts the three attributes of the inputted color into recording signals of an image recording device 104. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image processing apparatus, an image processing method, a program, and a recording medium that process image data stored in an image data storage unit and output the processed image data to an image data recording unit.

  An image is input by an image input device such as a digital still camera (hereinafter referred to as “DSC”) or a color scanner, and the image is displayed on an image display device such as a CRT or LCD. An image processing system for performing correction and confirming on an image display apparatus and recording an image with an image recording apparatus such as a color printer can be easily constructed with the spread of personal computers.

  In such an image processing system, since the color space of the image data in each apparatus is different, image data is exchanged via a standard color space to achieve color matching. That is, color conversion between the color space of each device and the standard color space is prepared for each device, and based on this, the image data of the image input device is converted into image data of the standard color space. Furthermore, the color of the image data is matched by converting the image data of the standard color space into image data of the color space of the image output device.

  As this standard color space, sRGB which is a standard monitor color space is widely used. In the sRGB color space, RGB (red, green, blue) chromaticity points which are the three primary colors of the monitor are defined, and the color is expressed by the magnitude of the luminance signal of each primary color. The spread of sRGB facilitates the provision of color conversion between the color space of each device and the standard color space, and also provides an image display device compliant with sRGB. Color matching is now possible without color conversion.

  However, the color gamuts that can be expressed in the sRGB color space often do not include the color gamuts of the respective devices. For this reason, another problem has arisen that the color gamuts of these devices cannot be fully utilized. For example, in DSC, the DSC image file format standard Exif (hereinafter referred to as “Exif”) is defined, and image data obtained by photographing can be converted into color space data called sYCC and stored. Many. In this sYCC color space, the relationship with the CIEXYZ (1931) color system is defined as follows.

  First, CIEXYZ is converted into linear sRGB values (Rs, Gs, Bs) as follows.

次に、線形ｓＲＧＢ値（Ｒｓ，Ｇｓ，Ｂｓ）を次のように非線形ｓＲＧＢ値（Ｒ，Ｇ，Ｂ）に変換する。

Next, the linear sRGB values (Rs, Gs, Bs) are converted into nonlinear sRGB values (R, G, B) as follows.

次に、非線形ｓＲＧＢ値（Ｒ，Ｇ，Ｂ）を次のようにｓＹＣＣ値（Ｙ，Ｃｂ，Ｃｒ）に変換する。

Next, the nonlinear sRGB values (R, G, B) are converted into sYCC values (Y, Cb, Cr) as follows.

また、ｓＹＣＣ値を８ｂｉｔのデジタル値として取扱う場合には、更に、次のように変換する。

Further, when the sYCC value is handled as an 8-bit digital value, it is further converted as follows.

dY = Y * 255
dCb = Cb * 255 + 128
dCr = Cb * 255 + 128 (6)
However, dY, dCb, and dCr are clipped within a range of 0 to 255.

  On the other hand, the relationship between the sRGB color space and the CIEXYZ (1931) color system is defined as follows. First, CIEXYZ is converted into linear sRGB values (Rs, Gs, Bs) as shown in equation (1). However, the linear sRGB values (Rs, Gs, Bs) are clipped within the range of 0-1.

  Next, the clipped linear sRGB values (Rs, Gs, Bs) are converted into nonlinear sRGB values (R ′, G ′, B ′) as follows.

また、ｓＲＧＢ値を８ｂｉｔのデジタル値として取扱う場合には、更に、次のように変換する。

Further, when the sRGB value is handled as an 8-bit digital value, it is further converted as follows.

dR = R '* 255
dG = G ′ * 255
dB = B ′ * 255 (9)
Therefore, when converting DSC image data represented by sYCC into sRGB image data, which is a standard color space, the reverse conversion of equation (6) ⇒ the reverse conversion of equation (5) ⇒ ( 2) to (4) reverse conversion → (1) After conversion to CIEXYZ by reverse conversion, (1) forward conversion → clipping processing → (7) to (8) forward conversion → ( 9) The forward conversion of the equation is performed. At that time, when the clipping process is actually performed, the color information is not accurately transmitted.

  Such image data is within the sYCC color gamut but outside the sRGB color gamut, and some of them are within the color gamut of the image recording apparatus. Therefore, when recording an image, the color gamut of the image input device (in this case, sYCC) or the color gamut of the image recording device cannot be fully utilized.

  For this reason, in Patent Document 1, image data is converted into sRGB which is a standard color space for an image display device and output, and the image recording device has an extended color space including the color reproduction range of the image recording device. Converted to output. Further, in Patent Document 2, image data outside the sRGB color gamut is converted into sRGB, the compression ratio of the color at that time is obtained, the sRGB value is converted into the color space of the image recording apparatus, and then based on the compression ratio. The color gamut is expanded.

JP 2003-87587 A Japanese Patent No. 4065482

  However, the former method is suitable for accurately recording the color information of the image data of the image input device, but when the difference from the color confirmed in the image display device is converted into a standard color space. There was a problem that when the clipping process was performed, it became large and it was not recorded with the desired color. In addition, the latter method can reduce the difference from the color confirmed in the image display device, but the color information in the saturation direction is substantially stored in the color information of the image data of the image input device. As much as possible, there is a problem that the color information of the image data of the image input device cannot be fully utilized.

The present invention has been made in view of the above-described problems, and an object of the present invention (Claim 1) is to make full use of the color gamut of the image input device and the color gamut of the image recording device. The color reproduced by the image recording apparatus is determined in consideration of the three attributes of the color of the image data input from the image input apparatus and the three attributes of the color when the image data is displayed on the image display apparatus. An object of the present invention is to realize an image processing apparatus that can perform the above processing.

  Further, the object of the present invention (Claim 2) relates to the improvement of Claim 1 of the present invention, and displays the color characteristics of the image data input from the image input apparatus and the image data on the image display apparatus. It is an object of the present invention to realize an image processing apparatus capable of recording an image in which each color characteristic is stored.

  The object of the present invention (Claim 3) relates to the improvement of Claim 2 of the present invention, and the color characteristics of the image data input from the image input apparatus and the image data are displayed on the image display apparatus. It is an object of the present invention to realize an image processing apparatus capable of recording an image in which the characteristics of each color are stored with a certain priority.

  An object of the present invention (Claim 4) relates to the improvement of Claims 1 to 3 of the present invention, and is characterized by the color characteristics of the image data input from the image input apparatus and the image data in the image display apparatus. An object of the present invention is to realize an image processing apparatus capable of setting the priority of color features when displayed.

  Another object of the present invention (Claim 5) is to take into account the three attributes of the color of the image data input from the image input device and the three attributes of the color when the image data is displayed on the image display device. An object of the present invention is to realize an image processing method capable of determining colors reproduced by an image recording apparatus.

  Further, the object of the present invention (Claim 6) relates to the improvement of Claim 5 of the present invention, and displays the color characteristics of the image data input from the image input apparatus and the image data on the image display apparatus. It is to realize an image processing method capable of recording an image in which the characteristics of the colors at that time are stored with a certain priority.

  An object of the present invention (Claim 7) relates to the improvement of Claim 5 or 6 of the present invention, and is characterized by the color characteristics of the image data input from the image input apparatus and the image data in the image display apparatus. An object of the present invention is to realize an image processing method capable of setting the priority of color features when displayed.

  Another object of the present invention (Claim 8) is to realize an image processing program for controlling an image processing apparatus and executing the image processing method according to Claims 5 to 7.

  Another object of the present invention (Claim 9) is to realize a recording medium in which the computer program is recorded so as to be readable by the computer.

  The present invention is an image processing apparatus that processes image data output from an image data storage unit that stores image data in luminance color difference format, and outputs the processed image data to an image data recording unit that records an image. Data format conversion means for converting the image data in the luminance color difference format output from the means into image data in the three primary colors format that can be supplied to the image display device; and three colors indicated by the output image data in the luminance color difference format Three attribute extracting means for extracting attributes and three attributes of the color indicated by the converted three primary color format image data; three attributes of the extracted luminance color difference format image data; and the extracted three primary color formats Image data generating means for determining three attributes of the color to be reproduced based on the three attributes of the color of the image data, and generating image data representing the determined three attribute colors, and the generated image The chromatography data, and the most important feature that at least and an image data converting means for converting the image data to be output to the image data recording means.

  Claim 1: An image processing apparatus for processing image data output from an image data storage means (101) for storing image data in luminance color difference format and outputting the processed image data to an image data recording means (104) for recording an image. And a data format conversion means (107) for converting the image data in the luminance color difference format output from the image data storage means into image data in the three primary colors that can be supplied to the image display device, and the output luminance color difference. Three attribute extracting means (108, 109) for extracting three attributes of the color indicated by the image data of the format and three attributes of the color indicated by the converted image data of the three primary colors, and the extracted luminance color difference format Based on the three attributes of the color of the image data and the three attributes of the color of the extracted three-primary-color image data, the three attributes of the color to be reproduced are determined, and the image data representing the determined three-attribute color An image characterized by comprising at least image data generating means (111) for generating and image data converting means (112) for converting the generated image data into image data to be output to the image data recording means (104). In the processing apparatus, the three attributes of the color to be reproduced are determined based on the three attributes of the color of the extracted luminance color difference image data and the three attributes of the extracted image data of the three primary colors. Reproduced by the image recording device in consideration of the three color attributes of the image data input from the image input device (storage means) and the three color attributes when the image data is displayed on the image display device. An image processing apparatus capable of determining a color could be realized.

  According to a second aspect of the present invention, the image data generating means includes at least one attribute of three attributes of the extracted luminance color difference format image data and at least one attribute of the three attributes of the extracted three primary color format image data. In the image processing apparatus according to claim 1, the three attributes of the color of the extracted image data in the luminance color difference format are determined (304, 305, 307, 308). Since the three attributes of the color having at least one attribute of the image data and at least one attribute of the three attributes of the extracted three-primary-color image data are determined, the image input from the image input device (storage means) To realize an image processing apparatus capable of recording an image in which the color characteristics of data and the color characteristics when the image data is displayed on the image display apparatus are stored. It could be.

  According to a third aspect of the present invention, the image data generating means compares the three attributes of the color of the extracted luminance color difference format image data with the difference of the three attributes of the color of the extracted three primary color format image data. 3. The image processing according to claim 2, further comprising: (401) and at least three attribute selection means (402) that determines the three attributes of the color to be reproduced based on the difference between the three attributes of the compared colors. In the apparatus, a three-attribute comparison means (401) for comparing a difference between three attributes of the color of the extracted luminance / color-difference image data and three attributes of the color of the extracted three-primary-color image data, and the comparison Since there is a three-attribute selection means (402) that determines the three attributes of the color to be reproduced based on the difference between the three attributes of the selected color, the color characteristics of the image data input from the image input device And the Color characteristics of the time of displaying the image data to the image display apparatus, it was possible to realize an image processing apparatus capable of recording an image, respectively stored at a constant priority.

  According to a fourth aspect of the present invention, there is provided color reproduction setting means (202 or 304 to 305 or 509) for setting a color reproduction priority between the color indicated by the luminance color difference image data and the color indicated by the three primary color image data. 4. The image processing apparatus according to claim 1, wherein the image data generation means determines three attributes of colors to be reproduced based on the set priority. Since the color reproduction setting means for setting the color reproduction priority between the color indicated by the image data and the color indicated by the image data of the three primary colors is provided, the color of the image data input from the image input device And an image processing apparatus capable of setting the priority of the color characteristics when the image data is displayed on the image display apparatus.

  Claim 5: An image processing method for processing image data acquired from image data storage means for storing image data in luminance color difference format for output to an image data recording means for recording an image, wherein the image data storage means The data format conversion step (602) for converting the image data in the luminance color difference format acquired from the image data into the image data in the three primary colors that can be supplied to the image display device, and the color 3 indicated by the acquired image data in the luminance color difference format A three-attribute extraction step (603, 604) for extracting the attributes and the three attributes of the color indicated by the converted three-primary-color image data; the three attributes of the color of the extracted luminance-color-difference image data; An image for determining three attributes of the color to be reproduced based on the three attributes of the color of the extracted three-primary-color image data, and generating image data representing the determined three-attribute color In an image processing method comprising: at least a data generation step (605); and an image data conversion step (606) for converting the generated image data into image data to be output to an image data recording means. Since the three attributes of the color to be reproduced are determined based on the three attributes of the color of the extracted luminance color difference image data and the three attributes of the extracted three primary color image data, the image input device (stores The color reproduced by the image recording apparatus is determined in consideration of the three attributes of the color of the image data input from the means) and the three attributes of the color when the image data is displayed on the image display apparatus. It was possible to realize an image processing method capable of

  According to a sixth aspect of the present invention, in the image data generation step, a three-attribute comparison step of comparing a difference between three attributes of the extracted luminance / color-difference image data and three extracted attributes of the three-primary-color image data. 6. The image processing according to claim 5, further comprising: (801) and a three-attribute selection step (803) for determining the three attributes of the color to be reproduced based on the difference between the three attributes of the compared colors. In the method, a three-attribute comparison step (801) for comparing a difference between three attributes of color of the extracted luminance color difference image data and three attributes of colors of the extracted three primary color image data, and the comparison Image data input from the image input device, since there is a three attribute selection step (803) for determining the three attributes of the color to be reproduced based on the difference between the three attributes of the selected color. And features of the color with the color characteristics of the time of displaying the image data to the image display apparatus, it was possible to realize an image processing method capable of recording an image, respectively stored at a constant priority.

  [7] A color reproduction setting step (701 or 802) for setting a priority level of color reproduction between the color indicated by the image data in the luminance color difference format and the color indicated by the image data in the three primary colors format, 7. The image processing method according to claim 5, wherein the data generation step determines three attributes of the color to be reproduced based on the set priority. Since there is a color reproduction setting step for setting the priority of color reproduction of the color indicated and the color indicated by the image data in the three primary colors, the color characteristics of the image data input from the image input device, An image processing method capable of setting the priority of color characteristics when the image data is displayed on the image display device can be realized.

  Claim 8: A program for controlling an image processing apparatus to execute the image processing method according to any one of claims 5 to 7, wherein the image processing apparatus is controlled to control the image processing apparatus according to claims 5 to 7. Since the described image processing method is executed, a program capable of controlling the image processing apparatus and executing the image processing method described in claims 5 to 7 can be realized.

  Claim 9: A recording medium in which a program for controlling the image processing apparatus to execute the image processing method according to claims 5 to 7 is recorded so as to be readable by a computer. Since the program for executing the image processing method according to claim 7 is recorded so as to be readable by the computer, a recording medium in which the program for executing the image processing method according to claims 5 to 7 is recorded so as to be readable by the computer is realized. We were able to.

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

Example 1
FIG. 1 shows the configuration of an image processing system of the present invention. In FIG. 1, 101 is an image storage device, 102 is an image processing device, 103 is an image display device, and 104 is an image recording device. The image storage device 101 is a device that captures a landscape or a person, or scans and stores a document or the like, and outputs it as image data. For the image data output from the image storage device 101, a color space having a sufficient width to represent the color gamut required by the image storage device 101 is selected. Here, the sYCC color, which is a luminance-color difference format, is selected. It is assumed that a space is selected. Here, the sYCC color space is a color space composed of the luminance Y obtained by converting the 3 × 3 matrix based on sRGB and the two color difference signals Cb and Cr as shown in the equation (5). As the color space, sYCC has a wider color gamut, and colors outside the sRGB color gamut can also be expressed.

  The image processing apparatus 102 is the core of the image processing system, and plays a role of mediating the exchange of image data among the devices such as the image storage device 101, the image display device 103, and the image recording device 104. For example, the image data output from the image storage device 101 is input to the display color conversion unit 105 of the image processing device 102, and the display color conversion unit 105 converts the image data input from the image storage device 101 into the image display device. Are converted into image data in the three primary colors format and output to the image display device 103. The image display device 103 is a device that displays input image data by a method such as an LCD or CRT, whereby the image data stored in the image storage device 101 is displayed. Here, it is assumed that the image display device 103 has characteristics conforming to sRGB, which is a standard monitor color space.

  The image data output from the image storage device 101 is also input to the recording color conversion unit 106 of the image processing device 102. The recording color conversion unit 106 converts the image data input from the image storage device 101 into an image recording unit. The image data is converted into device image data and output to the image recording device 104. The image recording apparatus 104 corresponds to a printer of an electrophotographic or ink jet system, and records input image data on a recording medium such as recording paper and outputs it as a hard copy. As a result, the image data stored in the image storage device 101 is reproduced on the recording paper.

  Here, paying attention to the inside of the recording color conversion unit 106, the display color format conversion unit 107 imitates the operation of the display color conversion unit 105 described above, and converts the image data into a format corresponding to the output to the image display device 103. Convert. That is, it is assumed that the image display device 103 has characteristics conforming to the standard monitor color space sRGB, and the display color conversion unit 105 converts the image data input from the image storage device 101 into sRGB image data. Therefore, the display color format conversion unit 107 converts the above-described reverse conversion of the expression (6) → the reverse conversion of the expression (5) → the reverse conversion of the expressions (2) to (4) → (1 ) After conversion to CIEXYZ by reverse direction conversion, forward conversion of equation (1) ⇒ clipping process ⇒ forward conversion of equations (7) to (8) ⇒ forward conversion of equation (9) The image data input from the apparatus 101 is converted.

  The display color 3 attribute calculation unit 108 is a block that calculates 3 attributes of colors displayed on the image display device 103 based on the image data converted by the display color format conversion unit 107. Here, the three attributes of color are hue (Hue), saturation (Saturation), and lightness (Lightness). Hue is a color difference such as red, blue, and green, and saturation is color. The brightness represents the brightness of the color. Here, the three attributes of color are calculated based on CIELAB.

  That is, CIEXYZ and CIELAB have the following relationship:

従って、表示色３属性算出部１０８は、（９）式の逆方向変換⇒（７）乃至（８）式の逆方向変換⇒（１）逆方向変換によりＣＩＥＸＹＺに変換後、（１１）式の順方向変換⇒（１２）式の順方向変換を実施して、表示色形式変換部１０７が変換した画像データから色の３属性を算出する。

Accordingly, the display color 3 attribute calculation unit 108 converts the backward conversion of the expression (9) → the backward conversion of the expressions (7) to (8) → (1) after the conversion to CIEXYZ by the backward conversion, the expression (11) Forward direction conversion => (12) forward direction conversion is performed to calculate three color attributes from the image data converted by the display color format conversion unit 107.

  On the other hand, the original image color 3 attribute calculation unit 109 is a block that calculates three attributes of the color represented by the image data based on the image data input from the image storage device 101 that is the original image. That is, the original image color 3 attribute calculation unit 109 performs the above-described reverse conversion of the expression (6) → the reverse conversion of the expression (5) → the reverse conversion of the expressions (2) to (4) → (1) the reverse direction. After conversion into CIEXYZ by conversion, the forward conversion of the expression (11) → the forward conversion of the expression (12) is performed to calculate three attributes of the color represented by the image data input from the image storage device 101.

  The reproduction color 3 attribute determination unit 110 determines the three attributes of the color to be reproduced by the image recording apparatus 104 based on the three attributes of the colors calculated by the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit 109. It is a block to do. Here, when faithfully reproducing the color of the image displayed on the image display device 103, the three attributes of the color calculated by the display color three attribute calculation unit 108 are the three attributes of the color to be reproduced by the image recording device 104. When the original image, that is, the image data input from the image storage device 101 is faithfully reproduced, the three attributes of the color calculated by the original image color three attribute calculation unit 109 are reproduced by the image recording device 104. It can be determined as three attributes of the color to be used. In this case, the former has the advantage that the content displayed on the image display device 103 is recorded by the image recording device 104, so that the difference from the confirmed content is not recognized, but it is performed when converting to sRGB. Due to clipping, the problem arises that the color gamut of the original image cannot be fully utilized. On the other hand, in the latter case, although the color gamut of the original image can be fully utilized, recording different from the content displayed on the image display device 103 is performed by the image recording device 104. The problem of not being able to make the most of it. For this reason, the present invention provides a color reproduction mode different from these. That is, in this mode, the three attributes of the color to be reproduced by the image recording device 104 are determined based on the three attributes of the colors calculated by the display color three attribute calculation unit 108 and the original image color three attribute calculation unit 109. Thus, the color gamut of the original image can be fully utilized, and the contents confirmed by the image display device 103 can be utilized.

  A detailed example of such a reproduction color 3 attribute determination unit 110 is shown in FIG. Referring to FIG. 2, the reproduction color 3 attribute determination unit 110 determines the reproduction color 3 attribute determination in addition to the three attributes of the colors calculated by the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit 109 described above. A mode control signal 201 for controlling the color reproduction mode of the unit 110 is input.

  The mode control signal 201 is a signal that takes a value α of 0 to 1. For example, the mode control signal 201 is set in advance by a slide switch 202 or the like on an operation panel of an image processing system (not shown) and is input as a signal value.

  The reproduction color 3 attribute determination unit 110 in FIG. 2 includes six multipliers 203 to 208 and three adders 209 to 211, and the display color 3 attribute calculation unit 108 and the original color according to the mode control signal 201. The three color attributes calculated by the image color three attribute calculation unit 109 are weighted and output. That is, the value α of the mode control signal 201 is set to the three attributes (L * 1, H * 1, S * 1) of the color output from the display color 3 attribute calculation unit 108, and the original image color 3 attribute calculation unit 109 The three attributes (L * 2, H * 2, S * 2) of the calculated color are multiplied by the outputs of the complement calculator 212 for calculating the one's complement (1-α) of the value α by the multipliers 203 to 208. The adders 209 to 211 add the outputs for each of the three color attributes.

これにより、原画が持つ色域を十分に生かすと共に、画像表示装置１０３で確認した内容を生かすこともできる。また、本実施例によれば、スライド・スイッチ２０２等により、重み付け加算の重みαを制御することができるので、原画が持つ色域や画像表示装置１０３で確認した内容を任意の重みで生かすことができる。

This makes it possible to make full use of the color gamut of the original image and to make use of the contents confirmed by the image display device 103. Further, according to the present embodiment, the weight α for weighted addition can be controlled by the slide switch 202 or the like, so that the color gamut of the original image and the content confirmed by the image display device 103 can be utilized with an arbitrary weight. Can do.

  Referring again to FIG. 1, the three attributes of the color determined by the reproduction color three attribute determination unit 110 are sent to the recording color gamut mapping unit 112. The recording color gamut mapping unit 112 is a block that generates a recording signal of the image recording apparatus 104 for recording the corresponding color according to the three attributes of the input color and outputs the recording signal to the image recording apparatus 104. That is, the recording color gamut mapping unit 112 is prepared in advance with a color gamut mapping table in which the correspondence between the three attributes of colors and the recording signals of the image recording apparatus 104 is described. With reference to the area mapping table, the three attributes of the input color are converted into a recording signal of the image recording apparatus 104.

  In addition, the image processing control unit 113 controls the operation of each unit of the image processing apparatus 102 and communicates with the image storage apparatus 101, the image display apparatus 103, and the image recording apparatus 104 to perform operations as the entire image processing system. For example, a microcomputer system comprising a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), I / O (I / O Interface), etc. It is realized with.

Example 2
In the first embodiment described above, the reproduction color 3 attribute determination unit 110 weights and adds the 3 attributes of the colors calculated by the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit 109, and the image recording apparatus 104 Although the three attributes of the color to be reproduced are determined, the present invention reproduces the image recording apparatus 104 based on the three attributes of the color calculated by the display color three attribute calculation unit 108 and the original image color three attribute calculation unit 109. If the three attributes of the power color are determined, the present invention is not limited to this.

  In the following, an example of the reproduction color 3 attribute determination unit 110 determined by another method is shown in FIG. Referring to FIG. 3, the reproduction color 3 attribute determination unit 110 includes the color 3 attributes calculated by the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit 109 described above. Selection control signals 301 to 303 for controlling selection are input.

  The selection control signals 301 to 303 are signals that take a value of 0/1. For example, the selection control signals 301 to 303 are set in advance by setting switches 304 to 306 on the operation panel of the image processing system (not shown) and are input as signal values.

  The reproduction color 3 attribute determination unit 110 in FIG. 3 includes three selectors 307 to 309, and the selectors 307 to 309 respectively include the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit that are input to each. The three attributes of the color calculated by 109 are selected according to the selection control signals 301 to 303 and output as the three attributes of the color to be reproduced.

  Here, the setting switches 304 and 305 are structured to be set in conjunction with each other, and the selection control signals 301 and 302 always take the same value. On the other hand, the input positions of the three color attributes of the display color three attribute calculation unit 108 and the three colors of the original image color three attribute calculation unit 109 input to the selectors 307 and 308 are interchanged. Therefore, when the selector 307 selects the three attributes of the color of the display color three attribute calculator 108, the selector 308 selects the three attributes of the color of the original image color three attribute calculator 109, and the selector 307 selects the original attribute. When the three color attributes of the image color three attribute calculating unit 109 are selected, the selector 308 is in a state of selecting the three color attributes of the display color three attribute calculating unit 108. The setting switch 306 is configured to be set independently. Therefore, the three attributes of the color selected by the selector 309 can be freely selected.

  As described above, according to this embodiment, at least one of the three attributes of the color calculated by the display color 3 attribute calculation unit 108 and at least one of the three attributes of the color calculated by the original image color 3 attribute calculation unit 109 are described. Since the three attributes of colors to be reproduced by the image recording apparatus 104 are determined based on the two attributes, for example, the hue of the original image is faithfully reproduced, the hue of the display image is faithfully reproduced, or the original image For example, the color characteristics of the image data input from the image input device and the color characteristics when the image data is displayed on the image display device are recorded. Can do. In addition, according to the present embodiment, the color switches included in the image data output from the image storage device, and the priority of the color features when the image data is displayed on the image display device, the setting switches 304 to 306, etc. Can be set arbitrarily.

Example 3
FIG. 4A shows an example of another reproduction color 3 attribute determination unit 110. Referring to FIG. 4A, the reproduction color 3 attribute determination unit 110 compares the three attributes of the three colors calculated by the display color 3 attribute calculation unit 108 and the original image color 3 attribute calculation unit 109 described above. Based on the comparison result of the comparison unit 401 and the three-attribute comparison unit 401, the three-attribute selection determination unit 402 that determines the three attributes of the color to be selected, and the three attributes of the color are selected according to the determination of the three-attribute selection determination unit 402 Three selectors 406 to 408 are provided.

  Here, a detailed example of the three-attribute comparison unit 401 is shown in FIG. Referring to FIG. 5, the three attribute comparison unit 401 includes three attributes (lightness L *, hue H *, and saturation S *) of the colors calculated by the display color three attribute calculation unit 108 and the original image color three attribute calculation unit 109. Subtracters 501 to 503 for calculating the respective differences. Since the difference in hue is not the hue angle but is converted into a distance on an arc, the difference is obtained, and the difference is calculated after obtaining the product of hue H * and saturation S * by the multipliers 504 and 505. ing.

  The difference between the three attributes of the colors output from the subtracters 501 to 503 is input to the absolute value conversion unit 506, where it is converted into an absolute value of the difference. Further, the absolute value of the difference between the three attributes of the color converted by the absolute value converting unit 506 is input to the magnitude comparing unit 507, and the magnitudes of the absolute values are compared. That is, in the order of the absolute values of the differences in lightness, hue, and saturation that are the three attributes of the color, it is detected in which order the influence of clipping is detected, and the result is output to the three-attribute selection determining unit 402 Is done.

  Referring to FIG. 4A again, in addition to the output of the above-described three-attribute comparison unit 401, a selection control signal 409 for controlling the selection of the three attributes of colors is input to the three-attribute selection determination unit 402. Yes. Here, the selection control signal 409 is a signal for instructing whether to give priority to reproduction of the original image or to give priority to reproduction of the display image. For example, the setting switch 410 on the operation panel of the image processing system (not shown) or the like. Are preset and input as signal values. That is, when the setting is made such that the reproduction of the original image is relatively prioritized, the three attribute selection / determination unit 402 has the largest attribute among the absolute values of the differences in brightness, hue, and saturation as the original image color 3 Selection signals 403 to 405 that are selected from the three attributes of the color calculated by the attribute calculation unit 109 are output. For the second to third largest attributes, selection signals 403 to 405 are selected so as to be selected from the three attributes of the color calculated by the display color three attribute calculation unit 108. As a result, it is possible to record an image giving priority to reproduction of the original image while making use of the contents confirmed by the image display device 103. On the other hand, when the setting is made to give priority to reproduction of the display image, the largest attribute among the absolute values of the differences in brightness, hue, and saturation is the color calculated by the display color 3 attribute calculation unit 108. Selection signals 403 to 405 that can be selected from the three attributes are output, and selection signals 403 to 405 that are selected from the three attributes of the colors calculated by the original image color three attribute calculation unit 109 are selected as the second to third largest attributes. Output. Thereby, it is possible to record an image giving priority to reproduction of the display image while making use of the color information of the original image.

  An example of the relationship between the comparison result of the selection control signal 409 and the three-attribute comparison unit 401 and the three attributes of the color to be selected is shown in FIG. FIG. 4B shows an example in which the second largest attribute is selected from three non-priority attributes. In this case, the third largest attribute may be selected from either one, but FIG. An example of selecting from three priority attributes was shown.

  As described above, according to the present embodiment, the difference between the three attributes of the color calculated by the display color three attribute calculation unit 108 and the three attributes of the color calculated by the original image color three attribute calculation unit 109 is compared. Based on the comparison result of the attribute comparison unit 401, the three attribute comparison unit 401, the three attribute selection determination unit 402 that determines the three attributes of the color to be selected, and the three attributes of the color are selected according to the determination of the three attribute selection determination unit 402 Since the three selectors 406 to 408 are provided, the color 3 to be reproduced by the image recording apparatus 104 is determined according to whether the reproduction of the original image is relatively prioritized or the reproduction of the display image is relatively prioritized. Attributes can be determined. Further, according to the present embodiment, the color feature of the image data output from the image storage device and the priority of the color feature when the image data is displayed on the image display device can be arbitrarily set by the setting switch 410 or the like. Can be set to

  Note that the present invention may be applied to a system composed of a plurality of devices as shown in FIG. 1 or to an apparatus composed of a single device (for example, a direct printer).

Example 4
Although the present invention has been described above as an image processing apparatus having processing blocks as shown in FIG. 1, the object of the present invention may be achieved as an image processing method having the functions of the above-described embodiments.

  FIG. 6 shows a processing flowchart of an image processing method having a function equivalent to that of the recording color conversion unit 106 shown in FIG. First, an image data acquisition step 601 for acquiring sYCC image data stored in an image storage device or the like is performed.

  Next, a display color format conversion step 602 for converting the image data acquired in the image data acquisition step 601 into a format corresponding to the output to the image display device is performed. That is, the above-described reverse conversion of the expression (6) → the reverse conversion of the expression (5) → the reverse conversion of the expressions (2) to (4) → (1) After conversion to CIEXYZ by the reverse conversion, (1) Formula forward conversion ⇒ Clipping processing ⇒ Forward conversion of formulas (7) to (8) ⇒ Forward conversion of formula (9) is performed to convert sYCC image data in luminance-color difference format into sRGB in three primary colors format Convert to image data.

  Next, based on the image data converted in the display color format conversion step 602, a display color 3 attribute calculation step 603 for calculating three attributes of colors displayed on the image display device is performed. That is, the above-described reverse conversion of equation (9) ⇒ reverse conversion of equations (7) to (8) ⇒ (1) conversion to CIEXYZ by reverse conversion, then forward conversion of equation (11) ⇒ (12 ) Formula is converted in the forward direction, and three color attributes are calculated from the image data converted in the display color format conversion step 602.

  In parallel with this, an original image color 3 attribute calculation step 604 for calculating 3 attributes of the color represented by the image data based on the image data acquired in the image data acquisition step 601 is also performed. That is, the above-described reverse conversion of the expression (6) → the reverse conversion of the expression (5) → the reverse conversion of the expressions (2) to (4) → (1) after conversion to CIEXYZ by the reverse conversion, (11) Forward conversion of formula ⇒ Perform forward conversion of formula (12) to calculate three attributes of the color represented by the image data acquired in the image data acquisition step 601.

  Next, a reproduction color 3 attribute determination step for determining three attributes of the color to be reproduced by the image recording apparatus based on the three attributes of the colors calculated in the display color 3 attribute calculation step 603 and the original image color 3 attribute calculation step 604. 605 is performed. That is, here, based on the three attributes of the colors calculated by the display color three attribute calculation step 603 and the original image color three attribute calculation step 604, the three attributes of the color to be reproduced by the image recording apparatus are determined. The color gamut of the original image is fully utilized, and the contents confirmed by the image display device can be utilized.

  FIG. 7 shows an example of a detailed processing flowchart of the reproduction color 3 attribute determination step 605. Referring to FIG. 7, the reproduction color 3 attribute determination step 605 first performs a mode control signal acquisition step 701 for acquiring a mode control signal for controlling the color reproduction mode. The mode control signal is a signal that takes a value α of 0 to 1 as described above, and is preset by, for example, the slide switch 202 as described above.

  Next, in accordance with the acquired mode control signal, a weighted addition step 702 is performed in which the three attributes of the colors calculated in the display color 3 attribute calculation step 603 and the original image color 3 attribute calculation step 604 are weighted and output. That is, the calculation of the above-described equation (13) is performed to determine the three attributes of the color to be reproduced by the image recording apparatus.

  According to the present embodiment, since weighting can be set in advance using the slide switch 202 or the like, the color gamut of the original image and the content confirmed by the image display device 103 can be utilized with arbitrary weighting.

  Referring to FIG. 6 again, next, a recording color gamut mapping for generating a recording signal of the image recording apparatus for recording the corresponding color based on the three attributes of the color determined by the reproduction color three attribute determination step 605. Step 606 is performed. That is, for the recording color gamut mapping step 606, a color gamut mapping table in which the correspondence between the three attributes of the color and the recording signal of the image recording apparatus is prepared is prepared in advance. By referring to the area mapping table, it is converted into a recording signal of the image recording apparatus.

Example 5
Another example of the reproduction color 3 attribute determination step 605 is shown in FIG. Referring to FIG. 8, the reproduction color 3 attribute determination step 605 first includes a 3 attribute comparison step of comparing the difference between the 3 attributes of the colors calculated in the display color 3 attribute calculation step 603 and the original image color 3 attribute calculation step 604. 801 is performed.

  The 3-attribute comparison step 801 is an absolute difference between the three attributes (lightness L *, hue H *, and saturation S *) of the colors calculated in the display color 3 attribute calculation step 603 and the original image color 3 attribute calculation step 604. Find the value and compare its magnitude. In other words, in the order of the absolute values of the differences in lightness, hue, and saturation, which are the three attributes of color, the order of the influence of clipping is detected. Note that, as described above, the difference in hue is calculated not by the hue angle but by the distance on the arc instead of the hue angle.

  Next, a selection control signal acquisition step 802 for acquiring a selection control signal for controlling selection of the three color attributes is performed. This selection control signal is a signal for instructing whether to give priority to reproduction of the original image or to give priority to reproduction of the display image, and is set in advance by the setting switch 410 as described above, for example.

  Next, based on the result of the three attribute comparison step 801 and the acquired selection control signal, a three attribute selection step 803 for selecting three attributes of the color to be recorded is performed. That is, as in the example shown in FIG. 4B, the three-attribute selection step 803 determines the absolute value of the difference in lightness, hue, and saturation when the setting is made to give priority to reproduction of the original image. Among them, the largest attribute is selected from the three attributes of the color calculated in the original image color three attribute calculation step 604. The second largest attribute is selected from the three color attributes calculated in the display color three attribute calculation step 603. As a result, it is possible to record an image giving priority to reproduction of the original image while making use of the contents confirmed by the image display device 103. On the other hand, when the setting is made to give priority to the reproduction of the display image, the largest attribute among the absolute values of differences in brightness, hue, and saturation is the color calculated by the display color 3 attribute calculation step 603. The third largest attribute is selected, and the second largest attribute is selected from the three color attributes calculated by the original image color three attribute calculating step 604. Thereby, it is possible to record an image giving priority to reproduction of the display image while making use of the color information of the original image.

  As described above, according to the present embodiment, the difference between the three attributes of the color calculated by the display color three attribute calculation step 603 and the three attributes of the color calculated by the original image color three attribute calculation step 604 is compared. Since the attribute comparison step 801 and the three attribute selection step 803 for selecting the three attributes of the color to be selected based on the comparison result of the three attribute comparison step 801, the reproduction of the original image is relatively prioritized. Depending on whether display image reproduction has a relatively high priority, three attributes of colors to be reproduced by the image recording apparatus can be determined. In addition, according to the present embodiment, since the selection control signal acquisition step 802 for acquiring the selection control signal for controlling the selection of the three attributes of the color is provided, the reproduction of the original image is relatively prioritized or the display image is displayed. It is possible to arbitrarily set whether or not to give priority to reproduction.

  Another object of the present invention is to supply a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or apparatus, and the computer (or CPU or MPU) of the system or apparatus stores the storage medium. Needless to say, this can also be achieved by reading and executing the program code stored in.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention.

  As a storage medium for supplying the program code, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM, or the like is used. I can do it.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) running on the computer based on the instruction of the program code. It goes without saying that a part of the actual processing is performed and the functions of the above-described embodiments are realized by the processing.

  Further, after the program code read from the storage medium is written to a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the board or function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing. When the present invention is applied to the storage medium, the storage medium stores program codes corresponding to the flowcharts described above.

1 shows a configuration of an image processing system of the present invention. 3 shows a configuration of a reproduction color 3 attribute determination unit according to the first embodiment. The structure of the reproduction color 3 attribute determination part of Example 2 is shown. The structure of the reproduction color 3 attribute determination part of Example 3 is shown. The structure of the 3 attribute comparison part of Example 3 is shown. 10 is a processing flowchart of an image processing method according to a fourth embodiment. 10 shows a processing flowchart of a reproduction color 3 attribute determination step according to the fourth embodiment. 10 is a processing flowchart of a reproduction color 3 attribute determination step according to the fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Image storage apparatus 102 Image processing apparatus 103 Image display apparatus 104 Image recording apparatus 105 Display color conversion part 106 Recording color conversion part 107 Display color format conversion part 108 Display color 3 attribute calculation part 109 Original image color 3 attribute calculation part 110 Reproduction color 3 attribute determination unit 111 image data generation unit 112 recording color gamut mapping unit 113 image processing control unit

Claims (9)

  An image processing apparatus that processes image data output from an image data storage unit that stores image data in a luminance / color difference format, and outputs the processed image data to an image data recording unit that records an image, the output being output from the image data storage unit The data format conversion means for converting the image data in the luminance color difference format into the image data in the three primary colors that can be supplied to the image display device, the three attributes of the color indicated by the output image data in the luminance color difference format, Three attribute extracting means for extracting the three attributes of the color indicated by the converted image data of the three primary colors, the three attributes of the color of the extracted luminance color difference image data, and the extracted image data of the three primary colors Based on the three attributes of the color, the three attributes of the color to be reproduced are determined, image data generating means for generating image data representing the determined three attributes of the color, and the generated image data, The image processing apparatus characterized by having at least an image data converting means for converting the image data to be output to the image data recording means.   The image data generation means includes at least one attribute of the three attributes of the extracted luminance color difference format image data and at least one of the three attributes of the color of the extracted three primary color format image data. The image processing apparatus according to claim 1, wherein at least three attributes of colors are determined.   The image data generating means includes three attribute comparison means for comparing the difference between the three attributes of the extracted luminance color difference image data and the three attributes of the extracted three primary color image data, and the comparison 3. The image processing apparatus according to claim 2, further comprising at least three attribute selection means for determining the three attributes of the color to be reproduced based on the difference between the three attributes of the determined colors.   Color reproduction setting means for setting the priority of color reproduction between the color indicated by the image data in the luminance color difference format and the color indicated by the image data in the three primary colors format, and the image data generation means is configured to The image processing apparatus according to claim 1, wherein three attributes of a color to be reproduced are determined based on a priority level.   An image processing method for processing image data obtained from an image data storage means for storing image data in a luminance color difference format for output to an image data recording means for recording an image, wherein the luminance obtained from the image data storage means A data format conversion step for converting image data in the color difference format into image data in the three primary colors format that can be supplied to the image display device, three attributes of the color indicated by the acquired image data in the luminance color difference format, and the converted Three attribute extraction steps for extracting the three attributes of the color indicated by the image data in the three primary colors format, three attributes of the color of the extracted luminance color difference format image data, and three of the colors of the extracted image data in the three primary colors format An image data generation step for determining three attributes of colors to be reproduced based on the attributes, and generating image data representing the determined three attribute colors, and the generated image The chromatography data, image processing method, wherein at least and an image data conversion step of converting the image data to be output to the image data recording means.   The image data generation step includes a three-attribute comparison step for comparing a difference between three attributes of the color of the extracted luminance / color-difference image data and three attributes of the color of the extracted three-primary-color image data, and the comparison 6. The image processing method according to claim 5, further comprising at least a three-attribute selection step for determining the three attributes of the color to be reproduced based on the difference between the three attributes of the color.   A color reproduction setting step for setting a color reproduction priority level between the color indicated by the image data in the luminance color difference format and the color indicated by the image data in the three primary color format, and the image data generation step 7. The image processing method according to claim 5, wherein three attributes of the color to be reproduced are determined based on the priority level.   The program for making a computer implement | achieve the image processing method of any one of Claims 5 thru | or 7.   A computer-readable recording medium recording a program for causing a computer to implement the image processing method according to claim 5.

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