Apparatus for and method of color compensation
First Claim
1. An apparatus for color compensation of an input signal comprising:
- a chroma deflection generation unit to calculate a chroma deflection based on an input chroma signal detected from the input signal and a predetermined first reference value;
a hue deflection generation unit to calculate a hue deflection based on an input hue signal detected from the input signal and a predetermined second reference value;
a luminance deflection generation unit to calculate a luminance deflection based on an input luminance signal detected from the input signal and a predetermined third reference value;
a skin tone mapping function generation unit to output a compensated chroma signal, a compensated hue signal and a compensated luminance signal after individually compensating the input chroma, hue, and luminance signals based on the chroma deflection, the hue deflection and the luminance deflection; and
a color space conversion unit to respectively calculate the input chroma signal, the hue signal and the luminance signal by converting a color signal of the input signal in a color space, and transmit the chroma, hue, and luminance signals to the corresponding chroma deflection function generation unit, hue deflection function generation unit and luminance deflection function unit.
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Abstract
An apparatus for color compensation includes a chroma deflection generation unit to calculate a chroma deflection based on an input chroma signal and a predetermined first reference value, a hue deflection generation unit to calculate a hue deflection based on an input hue signal and a predetermined second reference value, a chroma deflection function generation unit to calculate a luminance deflection based on an input luminance signal and a predetermined third value, and a tone mapping function generation unit to output the chroma signal, hue signal and luminance signal after individually compensating these signals based on the chroma deflection, hue deflection and luminance deflection. According to the present invention, when color is distorted due to transmission flaws, the color can be compensated to be an appropriate color.
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Citations
42 Claims
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1. An apparatus for color compensation of an input signal comprising:
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a chroma deflection generation unit to calculate a chroma deflection based on an input chroma signal detected from the input signal and a predetermined first reference value; a hue deflection generation unit to calculate a hue deflection based on an input hue signal detected from the input signal and a predetermined second reference value; a luminance deflection generation unit to calculate a luminance deflection based on an input luminance signal detected from the input signal and a predetermined third reference value; a skin tone mapping function generation unit to output a compensated chroma signal, a compensated hue signal and a compensated luminance signal after individually compensating the input chroma, hue, and luminance signals based on the chroma deflection, the hue deflection and the luminance deflection; and a color space conversion unit to respectively calculate the input chroma signal, the hue signal and the luminance signal by converting a color signal of the input signal in a color space, and transmit the chroma, hue, and luminance signals to the corresponding chroma deflection function generation unit, hue deflection function generation unit and luminance deflection function unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of color compensation of an input signal comprising:
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calculating a chroma deflection based on an input chroma signal detected from the input signal and a predetermined first reference value; calculating a hue deflection based on an input hue signal detected from the input signal and a predetermined second reference value; calculating a luminance deflection based on an input luminance signal and a predetermined third reference value; outputting the compensated chroma, hue and luminance signals after individually compensating the input chroma, hue, and luminance signals based on the calculated chroma deflection, hue deflection, and luminance deflection; calculating the input chroma signal, the hue signal and the luminance signal by converting a color signal of the input signal in a color space; and individually transmitting the calculated chroma, hue, and luminance signals as the input chroma, hue, and luminance signals for use in the calculating the chroma deflection, the hue deflection, and the luminance deflection. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for color compensating an input image having image properties, comprising:
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a first deflection calculation unit to detect a first amount of deflection of a first one of the image properties from a first reference value; a second deflection calculation unit to detect a second amount of deflection of a second one of the image properties from a second reference value; and a compensation unit which compensates the first and second image properties of the input image using the first and second amounts of deflection so as to output a compensated image, wherein the first deflection calculation unit compares the first image property to first through third ranges to determine the first amount of deflection, the first range including the first reference value and for which the first amount of deflection is zero, the second range being disposed outside of the first range and for which the first amount of deflection is non-zero, and a third range being disposed outside of the first and second ranges and for which the first amount of deflection is zero. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A computer readable medium encoded with processing instructions for performing a method of color compensating an input image having image properties performed by a computer, the method comprising:
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calculating a first amount of deflection of a first one of the image properties from a first reference value; calculating a second amount of deflection of a second one of the image properties from a second reference value; and compensating the first and second image properties of the input image using the first and second amounts of deflection so as to output a compensated images, wherein the calculating the first amount of deflection comprises comparing the first image property to first through third ranges to determine the first amount, the first range including the first reference value and for which the first amount is zero, the second range being disposed outside of the first range and for which the first amount is non-zero, and a third range being disposed outside of the first and second ranges and for which the first amount is zero. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification