Patent ID: 8957999
Filing Date: 2015-02-17
Classification: H04N

Abstract:
1. A method of suppressing a dark halo in an imager using processing circuitry, comprising the steps of: using a high pass filter, extracting an edge value from an image; with the processing circuitry, determining a chroma zone associated with the edge value extracted from the image; modifying the edge value based on the chroma zone associated with the extracted edge value; demosaicing the image; and applying the modified edge value to the demosaiced image, wherein determining the chroma zone includes determining a chroma value of Cr and Cb in a Y-Cr-Cb color space, and modifying the edge value includes multiplying the edge value by a predetermined gain value, k, depending on the chroma value of Cr, wherein if the value of Cr is less than zero, then the gain value k is set to a value that is greater than one, in order to sharpen the modified edge value in the image.