Image processing apparatus, imaging apparatus, image processing method, and program
First Claim
1. An image processing apparatus comprising:
- a degree-of-deviation deriving unit which derives, for each predetermined unit area, a degree of deviation of a color of the unit area from a specific color corresponding to a predetermined characteristic amount of a subject; and
a correcting unit which corrects the color for each predetermined unit area based on a correction value corresponding to the degree of deviation derived by the degree-of-deviation deriving unit,wherein the degree-of-deviation deriving unit comprises;
a rotational converting unit which executes a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals in an image signal for a luminance-color difference system;
a normalizing unit which divides one of the color difference rotated signals obtained by the rotational converting unit by a luminance signal in the image signal to normalize the color difference rotated signal to obtain a color difference normalized signal;
a color saturation degree-of-deviation calculating unit which calculates a color saturation degree-of-deviation signal from a difference between the color difference normalized signal obtained by the normalizing unit and a predetermined coefficient; and
a hue degree-of-deviation calculating unit which divides the other of the color difference rotated signals obtained by the rotational converting unit by the one of the color difference rotated signals to calculate a hue degree-of-deviation signal from a resulting quotient.
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Abstract
The present invention includes a coordinate rotating circuit which executes a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals to obtain two color difference rotated signals, a normalizing circuit which divides the color difference rotated signal by a luminance signal to obtain a color difference normalized signal, a subtractor and an absolute value calculating circuit which calculate a color saturation degree-of-deviation signal from a difference between the color difference normalized signal and a coefficient, and a tangent circuit and an absolute value calculating circuit which divide the color difference rotated signal by the color difference rotated signal to calculate a hue degree-of-deviation signal from a resulting quotient.
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Citations
19 Claims
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1. An image processing apparatus comprising:
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a degree-of-deviation deriving unit which derives, for each predetermined unit area, a degree of deviation of a color of the unit area from a specific color corresponding to a predetermined characteristic amount of a subject; and a correcting unit which corrects the color for each predetermined unit area based on a correction value corresponding to the degree of deviation derived by the degree-of-deviation deriving unit, wherein the degree-of-deviation deriving unit comprises; a rotational converting unit which executes a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals in an image signal for a luminance-color difference system; a normalizing unit which divides one of the color difference rotated signals obtained by the rotational converting unit by a luminance signal in the image signal to normalize the color difference rotated signal to obtain a color difference normalized signal; a color saturation degree-of-deviation calculating unit which calculates a color saturation degree-of-deviation signal from a difference between the color difference normalized signal obtained by the normalizing unit and a predetermined coefficient; and a hue degree-of-deviation calculating unit which divides the other of the color difference rotated signals obtained by the rotational converting unit by the one of the color difference rotated signals to calculate a hue degree-of-deviation signal from a resulting quotient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An imaging apparatus comprising:
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an image taking unit which takes an image of a subject to obtain an image signal for a luminance-color difference system; a rotational converting unit which executes a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals in the image signal obtained by the image taking unit; a normalizing unit which divides one of the color difference rotated signals obtained by the rotational converting unit by a luminance signal in the image signal to normalize the color difference rotated signal to obtain a color difference normalized signal; a color saturation degree-of-deviation calculating unit which calculates a color saturation degree-of-deviation signal from a difference between the color difference normalized signal obtained by the normalizing unit and a predetermined coefficient; a hue degree-of-deviation calculating unit which divides the other of the color difference rotated signals obtained by the rotational converting unit by the one of the color difference rotated signals to calculate a hue degree-of-deviation signal from a resulting quotient; an image processing unit which executes image processing on the image signal using at least one of the color saturation degree-of-deviation signal and hue degree-of-deviation signal; and a recording unit which records an image signal obtained by the image processing unit.
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10. An image processing method comprising:
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a rotational converting step of executing a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals in an image signal for a luminance-color difference system; a normalizing step of dividing one of the color difference rotated signals obtained in the rotational converting step by a luminance signal in the image signal to normalize the color difference rotated signal to obtain a color difference normalized signal; a color saturation degree-of-deviation calculating step of calculating a color saturation degree-of-deviation signal from a difference between the color difference normalized signal obtained in the normalizing step and a predetermined coefficient; and a hue degree-of-deviation calculating step of dividing the other of the color difference rotated signals obtained in the rotational converting step by the one of the color difference rotated signals to calculate a hue degree-of-deviation signal from a resulting quotient. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A non-volatile computer-readable recording medium having stored thereon a program which is executable by a computer to perform processes comprising:
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a rotational converting step of executing a coordinate rotating conversion based on a predetermined rotation matrix, on each of two color difference signals in an image signal for a luminance-color difference system; a normalizing step of dividing one of the color difference rotated signals obtained in the rotational converting step by a luminance signal in the image signal to normalize the color difference rotated signal to obtain a color difference normalized signal; a color saturation degree-of-deviation calculating step of calculating a color saturation degree-of-deviation signal from a difference between the color difference normalized signal obtained in the normalizing step and a predetermined coefficient; and a hue degree-of-deviation calculating step of dividing the other of the color difference rotated signals obtained in the rotational converting step by the one of the color difference rotated signals to calculate a hue degree-of-deviation signal from a resulting quotient. - View Dependent Claims (17, 18, 19)
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Specification