Patent ID: 6600517
Filing Date: 2003-07-29
Classification: G06T,H04N

Abstract:
An apparatus for sharpening a first edge in a video image comprising:a first circuit capable of determining a first luminance value of a first pixel associated with said first edge and a second luminance value of a second pixel associated with said first edge, wherein said first and second pixels are adjacent pixels; a second circuit capable of determining a position of a first subpixel disposed between said first and second pixels, wherein said first subpixel position is disposed approximately at a center of said first edge; a third circuit capable of increasing a luminance value of a second subpixel disposed on a first side of said first edge center; and a fourth circuit capable of decreasing a luminance value of a third subpixel disposed on a second side of said first edge center opposite said first side, wherein said second circuit determines said position of said first subpixel by calculating a plurality of intermediate second-order derivatives of luminance at a plurality of subpixel positions disposed between said first and second pixels.