Image processing device and method
First Claim
Patent Images
1. An image processing device comprising:
- a converting section for converting image data according to a conversion characteristic of gradation conversion of the image data;
a designating section for designating a modification to the conversion characteristic of gradation conversion of the image data; and
a control section adapted to control the converting section such that a gradation of the image data is converted in accordance with the modified conversion characteristic,wherein the control section is further adapted to correct changes, which are imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, byreconverting the image data which is converted by the converting section, oradjusting the modified conversion characteristic of the converting section,wherein the control section reconverts the image data which is converted by the converting section, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted by the converting section, andwherein the control section reconverts the image data in accordance with a conversion characteristic which satisfies the following expressions;
R2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to R2−
(R2+G2+B2)/3,
G2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to G2−
(R2+G2+B2)/3,
B2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to B2−
(R2+G2+B2)/3,whereinR2′
, G2′
, B2′
are color component values of respective pixels of image data when image data, whose gradation has been converted in accordance with the modified conversion characteristic, is converted, andR2, G2, B2 are color component values of respective pixels of image data when image data, whose gradation has not been converted, is converted.
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Abstract
In order to achieve to adjust saturation of an image without leading to a deterioration in image quality, there is provided an image processing device and method in which a conversion data has a conversion characteristic which suppresses a change in saturation in a visible image for pixels belonging to a predetermined color region, and in order to achieve that changes in image quality which accompany conversion of gradation of an image data can be accurately corrected, there is provided an image processing device and method in which one of reconverting the image data which is converted or controlling a conversion characteristic is performed, such that changes in a ratio of a difference, of each of color components, with respect to gray of each pixel of the image data, which changes accompany conversion of the gradation of the image data, are corrected.
69 Citations
10 Claims
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1. An image processing device comprising:
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a converting section for converting image data according to a conversion characteristic of gradation conversion of the image data; a designating section for designating a modification to the conversion characteristic of gradation conversion of the image data; and a control section adapted to control the converting section such that a gradation of the image data is converted in accordance with the modified conversion characteristic, wherein the control section is further adapted to correct changes, which are imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, by reconverting the image data which is converted by the converting section, or adjusting the modified conversion characteristic of the converting section, wherein the control section reconverts the image data which is converted by the converting section, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted by the converting section, and wherein the control section reconverts the image data in accordance with a conversion characteristic which satisfies the following expressions;
R2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to R2−
(R2+G2+B2)/3,
G2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to G2−
(R2+G2+B2)/3,
B2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to B2−
(R2+G2+B2)/3,wherein R2′
, G2′
, B2′
are color component values of respective pixels of image data when image data, whose gradation has been converted in accordance with the modified conversion characteristic, is converted, andR2, G2, B2 are color component values of respective pixels of image data when image data, whose gradation has not been converted, is converted. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing device comprising:
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a converting section for converting image data according to a conversion characteristic of gradation conversion of the image data; a designating section for designating a modification to the conversion characteristic of gradation conversion of the image data; and a control section adapted to control the converting section such that a gradation of the image data is converted in accordance with the modified conversion characteristic, wherein the control section is further adapted to correct changes, which are imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, by reconverting the image data which is converted by the converting section, or adjusting the modified conversion characteristic of the converting section, wherein the control section reconverts the image data which is converted by the converting section, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted by the converting section, and wherein the converting section converts the image data by a multidimensional look-up table, and the control section adjusts the modified conversion characteristic by setting, in the multidimensional look-up table, conversion data in which are superposed the modified conversion characteristic and another conversion characteristic which corrects the changes imposed by the modified conversion characteristic.
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8. An image processing device comprising:
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a converting section for converting image data according to a conversion characteristic of gradation conversion of the image data; a designating section for designating a modification to the conversion characteristic of gradation conversion of the image data; and a control section adapted to control the converting section such that a gradation of the image data is converted in accordance with the modified conversion characteristic, wherein the control section is further adapted to correct changes, which are imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, by reconverting the image data which is converted by the converting section, or adjusting the modified conversion characteristic of the converting section, wherein the control section reconverts the image data which is converted by the converting section, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted by the converting section, and wherein the converting section converts the image data by a multidimensional look-up table, and the control section adjusts the modified conversion characteristic by setting, in the multidimensional look-up table, conversion data which limits application of the modified conversion characteristic to the conversion of data corresponding to an achromatic color portion among image data inputted to the multidimensional look-up table.
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9. An image processing device comprising:
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a converting section for converting image data according to a conversion characteristic of gradation conversion of the image data; a designating section for designating a modification to the conversion characteristic of gradation conversion of the image data; and a control section adapted to control the converting section such that a gradation of the image data is converted in accordance with the modified conversion characteristic, wherein the control section is further adapted to correct changes, which are imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, by reconverting the image data which is converted by the converting section, or adjusting the modified conversion characteristic of the converting section, wherein the control section reconverts the image data which is converted by the converting section, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted by the converting section, and wherein a slope of the conversion characteristic is modified via the designating section in order to designate the modification to the conversion characteristic.
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10. An image processing method comprising:
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designating a modification to a conversion characteristic of gradation conversion of image data; converting a gradation of the image data in accordance with the modified conversion characteristic; and correcting changes imposed by the modification to the conversion characteristic on the difference values between each color component of a pixel in the image data and the gray level of that pixel, by reconverting the image data which is converted according to the modified conversion characteristic, or adjusting the modified conversion characteristic, wherein the correcting changes step reconverts the image data which is converted, or adjusts the modified conversion characteristic, such that the difference values between each color component of a pixel and the gray level of that pixel of the image data remain substantially unchanged as compared to before the image data is converted, and wherein the correcting changes step reconverts the image data in accordance with a conversion characteristic which satisfies the following expressions;
R2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to R2−
(R2+G2+B2)/3,
G2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to G2−
(R2+G2+B2)/3,
B2′
−
(R2′
+G2′
+B2′
)/3 is substantially equal to B2−
(R2+G2+B2)/3,wherein R2′
, G2′
, B2′
are color component values of respective pixels of image data when image data, whose gradation has been converted in accordance with the modified conversion characteristic, is converted, andR2, G2, B2 are color component values of respective pixels of image data when image data, whose gradation has not been converted, is converted.
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Specification
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Current AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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Original AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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InventorsIwaki, Yasuharu
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Primary Examiner(s)NGUYEN, ANH-VINH THI
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Application NumberUS11/191,044Publication NumberTime in Patent Office831 DaysField of Search358/1.9, 358/521, 358/520, 358/523, 358/522, 358/518, 382/167, 382/162US Class Current358/1.9CPC Class CodesH04N 1/6005 with luminance or chrominan...H04N 1/6027 Correction or control of co...H04N 1/62 Retouching, i.e. modificati...H04N 1/628 Memory colours, e.g. skin o...
