METHOD AND APPARATUS FOR COMPRESSING A REFERENCE FRAME IN ENCODING/DECODING MOVING IMAGES
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United States of America Patent
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Issued Date -
Feb 4, 2010
app pub date -
Jul 29, 2009
filing date -
Jul 29, 2008
priority date (Note) -
Abandoned
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Abstract
Provided is a method of compressing a reference frame in encoding or decoding moving images. A reference frame to be compressed is divided into basic processing blocks. The basic processing blocks are divided into sub-blocks. A maximum value and a minimum value of pixels within each sub-block are calculated. A necessary bit length needed for compression of each sub-block is obtained based on a difference between the maximum value and the minimum value. An average bit length of the sub-blocks within the basic processing block is calculated based on the calculated necessary bit lengths of the sub-blocks. Bits are variably allocated to each sub-block by adjusting the necessary bit length of each sub-block so that the average bit length of the sub-blocks within a corresponding basic processing block is less than or equal to a preset required bit length. Each sub-block is compressed to the allocated bits.
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