Patent ID: 7123308
Filing Date: 2006-10-17
Classification: H04N

Abstract:
1. A video correction apparatus for setting one or a plurality of angle regions on a color difference plane formed by first and second axes as correction regions, and correcting video in the correction regions, when one of first and second color difference signals which are color signal components of a pixel of a video signal is used as the first axis, and the other of the first and second color difference signals is used as the second axis crossing at right angles to the first axis, the apparatus comprising: angle calculation unit configured to calculate an angle formed by components of the first and second color difference signals of each input pixel on the color difference plane; a hue correction gain calculation unit configured to use the angle of each input pixel calculated by the angle calculation unit as a parameter to set a hue correction gain for correcting hue of the pixel of the video signal to zero outside the correction regions and to calculate the hue correction gain for correcting the hue of the pixel in each correction region based on a hue correction gain calculation equation for generating a predetermined hue correction gain for each correction region; and a hue correction unit configured to correct the hue of the pixel in each correction region by a calculation using the first and second color difference signals and the hue correction gain; a luminance correction gain calculation unit configured to use the angle of each input pixel calculated by the angle calculation unit as the parameter thereby to set a luminance correction gain for correcting luminance of the pixel of the video signal to zero outside the correction regions and calculate the luminance correction gain for correcting the luminance of the pixel in each correction region based on a luminance correction gain calculation equation for generating a predetermined luminance correction gain for each correction region; and a luminance correction unit configured to multiply a first correction function for correcting a luminance signal component of the pixel of the video signal by the luminance correction gain, and add the multiplication result to the luminance signal component to correct the luminance of the pixel of the video signal.