Image encoding apparatus adaptively determining a scan pattern according to an intra prediction mode
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United States of America Patent
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Feb 28, 2017
Grant Date -
Jul 7, 2016
app pub date -
Mar 11, 2016
filing date -
Jul 31, 2010
priority date (Note) -
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Abstract
Provided is an image encoding apparatus that generates a prediction block according to an intra prediction mode, generates a residual block, transforms the residual block to generate a transform block, quantizes the transform block to generate a quantized transform block, scans the quantized transform block to generate one-dimensional (1D) quantized coefficients, and entropy-codes the 1D quantized coefficients. When a size of the transform block is 8×8, the quantized transform block is divided into a plurality of sub-blocks, the plurality of sub-blocks are scanned are coefficients of each sub-block are scanned using a same scan pattern determined according to the intra prediction mode. The quantized coefficients of each sub-block are scanned in a reverse direction from a last non-zero coefficient according the scan pattern.
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