Patent ID: 7200279
Filing Date: 2007-04-03
Classification: H04N

Abstract:
1. A method for performing chroma suppression for an image sensor system, said method comprising the steps of: a) determining the intensity of spatial frequency for a current processing pixel within a block of Bayer pattern by using edge detection that utilizes pixels values of green pixels within said block of Bayer pattern; and b) reducing the chromatic saturation of said current processing pixel based on said determined intensity of spatial frequency of said current processing pixel; wherein said region of Bayer pattern is a 4×4 block of pixels containing said current processing pixel; wherein said step a) further comprises the steps of: a1) calculating a first plurality of 4 first order pixel value sums V[0] to V[3], wherein an i-th pixel value sum V[i] characterizes the pixel value sum for a pair of green pixel values associated respectively with a pair of green pixels lying on the i-th vertical column of said Bayer pattern region; and a2) calculating a second plurality of 4 first order pixel value sums H[0] to H[3], wherein an j-th pixel value sum H[j] characterizes the pixel value sum for a pair of green pixel values associated respectively with a pair of green pixels lying in the j-th horizontal column of said Bayer pattern region; wherein said step a) further comprises the steps of: a3) calculating Vavg[0]=V[0]+V[2] and Vavg[1]=V[1]+V[3]; a4) calculating Vmax=|Vavg[0]−Vavg[1]|; a3) calculating Havg[0]=H[0]+H[2] and Havg[1]=H[1]+H[3]; and a4) calculating Hmax=|Havg[0]−Havg[1]|; wherein a number GI is used to determine the intensity of spatial frequency of said current processing pixel, wherein said number GI is defined as the greater value of said two values Vmax and Hmax.