Image coding method and decoding method and device thereof

Image coding method and decoding method and device thereof

CN
  • CN 1,976,469 A
  • Filed: 03/27/2003
  • Published: 06/06/2007
  • Est. Priority Date: 04/15/2002
  • Status: Active Application
First Claim
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1. coding/decoding method, being used for the piece is that unit decodes to coded data, this method comprises:

  • Obtain step, by with reference to before be stored in expression in the memory and be arranged in the information of sum of nonzero coefficient that the information of the sum of the nonzero coefficient of the upper block of decoded current block top and the expression that is stored in above-mentioned memory before is arranged in the left side block in above-mentioned current block left side, obtain the sum of the nonzero coefficient in the above-mentioned upper block and the sum of the nonzero coefficient in the above-mentioned left side block, wherein each nonzero coefficient is for having the conversion coefficient of " 0 " level value in addition;

    Determining step according to the sum of the nonzero coefficient in the sum of the nonzero coefficient in the above-mentioned upper block that is obtained and the above-mentioned left side block that obtained, is determined the predicted value with the sum of the nonzero coefficient in the decoded above-mentioned current block;

    Select step,, select the variable length code table according to determined predicted value;

    Decoding step by using selected variable length code table, is decoded to the coded data that the sum by the nonzero coefficient in the above-mentioned current block of encoding obtains, to obtain the sum of the nonzero coefficient in the decoded above-mentioned current block;

    AndStoring step is stored in the sum of above-mentioned decoded nonzero coefficient in the above-mentioned memory, as the information of the sum of the nonzero coefficient in the above-mentioned current block of expression.

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