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Image decoding method, image coding method, image decoding apparatus, image coding apparatus, and image coding and decoding apparatus

  • US 10,165,277 B2
  • Filed: 09/08/2017
  • Issued: 12/25/2018
  • Est. Priority Date: 06/30/2011
  • Status: Active Grant
First Claim
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1. A coding method for coding a control parameter for controlling coding of an image, the coding method comprising:

  • determining a context for a current block in the image, from among a plurality of contexts; and

    performing arithmetic coding on the control parameter for the current block to generate a bitstream corresponding to the current block,wherein the determining further includes;

    determining a signal type under which the control parameter for the current block is classified;

    determining the context by using both of coded control parameters for a left block and an upper block, when the signal type is a first type, the left block being a neighboring block to the left of the current block, and the upper block being a neighboring block on top of the current block; and

    determining the context by using a predetermined fixed value, without using any of the coded control parameters for the left block and the upper block, when the signal type is a second type different from the first type,wherein the control parameter of the first type belongs to a block of a size larger than or equal to a size of a block to which the control parameter of the second type belongs,wherein one of a split flag and a skip flag is classified under the first type, the split flag indicating whether or not the current block is partitioned into a plurality of blocks, and the skip flag indicating whether or not the current block is to be skipped, andwherein a difference parameter and a residual flag are classified under the second type, the difference parameter indicating a difference between a motion vector and a motion vector predictor of the current block, and the residual flag indicating whether or not luma coefficient data and chroma coefficient data are included in the current block.

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