Pixel interpolation filters for video decompression processor

Details Pixel interpolation filters for video decompression processor Pixel interpolation filters for video decompression processor

H - Electricity

04

N

H04N 7/50 (2006.01) H04N 7/26 (2006.01) H04N 7/36 (2006.01) H04N 7/46 (2006.01) H04N 5/14 (2006.01)

Patent

CA 2160301

A method and apparatus are disclosed for interpolating pixels to obtain subpels for use by a video decompression processor. A prediction area is defined from which subpels are necessary to decompress a portion of a video image. Instead of reading all of the pixels from the prediction area and then processing them together to perform the necessary interpolation, portions of the pixel data are read and simultaneously averaged using in-place computation in order to reduce hardware requirements. Rounding of subpixel results is achieved using the carry input of conventional adders to add a binary "1" to the averaged pixels, which are subsequently truncated to provide the interpolated subpels.

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