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Image processing apparatus, imaging apparatus, image processing method, and program

  • US 7,821,546 B2
  • Filed: 11/01/2006
  • Issued: 10/26/2010
  • Est. Priority Date: 11/18/2005
  • Status: Active Grant
First Claim
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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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