Patent ID: 7724308

Claim:
A cross color suppressing apparatus, used for suppressing cross color of a frame, the frame comprising a plurality of pixels, image data of each pixel comprising a luminance and a chrominance, the apparatus comprising: a diagonal edge detector, for determining whether a target pixel is on a diagonal edge according to the luminance of the target pixel and the neighboring pixels of the target pixel, wherein the target pixel is one of the pixels; a cross color detector, for determining whether the chrominance of the target pixel is substantially different from the chrominance of the neighboring pixels of the target pixel, wherein the cross color detector respectively compares the chrominance of the target pixel and the neighboring pixels of the target pixel with a standard value and classifies them as a first category and a second category different from the first category, and the cross color detector determines that the chrominance of the target pixel is substantially different from the chrominance of the neighboring pixels above and under the target pixel if the target pixel and the neighboring pixels at the same row with the target pixel belong to the first category and the neighboring pixels above and under the target pixel belong to the second category; and a chrominance suppressing unit, for suppressing the chrominance of the target pixel and the neighboring pixels of the target pixel if both the determination results of the diagonal edge detector and the cross color detector are true.