Image decoding apparatus and image coding apparatus wth parallel decoding

  • US 9,042,457 B2
  • Filed: 06/05/2009
  • Issued: 05/26/2015
  • Est. Priority Date: 06/10/2008
  • Status: Active Grant
First Claim
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1. An image decoding apparatus which decodes a coded stream generated by coding, on a block-by-block basis, a picture including blocks, said image decoding apparatus comprising:

  • a processor; and

    a non-transitory memory which stores thereon executable instructions, which when executed, cause the processor to function as;

    a predecoding unit configured to perform, on a block group-by-block group basis, variable length decoding and generate block decoding information using a result of the variable length decoding for each block group from among a plurality of block groups which (i) contain blocks, (ii) are different from each other, and (iii) are included in the coded stream, the block decoding information for the block group being a parameter necessary for decoding another block group from among the plurality of block groups; and

    block decoding units each configured to perform decoding, using the block decoding information generated using the result of the variable length decoding performed by said predecoding unit, on a block-by-block basis on one of the plurality of block groups in parallel,wherein the decoding performed by each of said block decoding units on the block-by-block basis on the one of the plurality of block groups in parallel includes re-executing the variable length decoding on each of the plurality of blocks groups on which the variable length decoding has been performed by said predecoding unit to determine a prediction mode to be performed on the block group.

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