Patent ID: 8145014
Filing Date: 2012-03-27
Classification: H04N

Abstract:
1. An apparatus for removing color noise comprising: a color interpolation unit performing color interpolation on a bayer pattern image output from an image sensor to determine color values of respective pixels; a high-pass filter unit performing high-pass filtering on each of the pixels of the bayer pattern image in a horizontal direction and a vertical direction to generate a horizontal high-pass filtered value of each of the pixels of the bayer pattern image and a vertical high-pass filtered value of each of the pixels of the bayer pattern image; a high frequency region determining unit comparing pixel values of a target pixel, from which color noise is removed, and pixels adjacent to the target pixel with the horizontal and vertical high-pass filtered values to determine whether the target pixel is included in a high frequency region; a color noise region determining unit using differences between color values of the target pixel interpolated by the color interpolation unit and determining whether the target pixel is included in a color noise region when it is determined that the target pixel is included in the high frequency region; and a color noise removing unit replacing a color value and a blue value of the target pixel with a green value of the target pixel when it is determined that the target pixel is included in the color noise region.