Half-pixel interpolation for a motion compensated digital...

H - Electricity – 04 – N

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H04N 7/12 (2006.01) H04N 5/14 (2006.01) H04N 7/26 (2006.01)

Patent

CA 2113045

A scheme is provided for processing previous frame data in a motion compensated digital video system to interpolate pixels used in reconstructing a current video frame. Pixel data from a previous video frame is arranged into sub-blocks containing a plurality N of pixels. The sub-blocks are stored in a memory to enable the retrieval of at least one sub-block per memory access cycle. A plurality M of sub-blocks are retrieved from the memory in response to a displacement vector associated with a portion of a current video frame. M is less than or equal to N and the M sub-blocks are retrieved in no more than M memory access cycles. A subset of pixels is chosen from the selected plurality of sub-blocks for use in interpolating pixels for the current video frame portion. The subset of pixels is processed over no more than N memory access cycles to provide N interpolated pixels for the current video frame portion.

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