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METHOD OF CODING AND DECODING IMAGES, DEVICE FOR CODING AND DECODING IMAGES AND COMPUTER PROGRAMMES CORRESPONDING THERETO

  • US 20200137419A1
  • Filed: 12/27/2019
  • Published: 04/30/2020
  • Est. Priority Date: 08/31/2015
  • Status: Active Grant
First Claim
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1. A method comprisingcoding at least one image split up into blocks, implementing by processing circuitry of a coding device, for a current block to be coded of said image:

  • predicting the current block in accordance with a mode of prediction selected by the coding device from among two predetermined modes of prediction Intra and Inter, the selected mode of prediction being Intra,calculating a residual data block representative of a difference between a predictor block obtained on completion of the predicting and the current block,applying a transform operation to data of said residual data block, said transform operation belonging to a set of transform operations which is stored in a non-transitory computer-readable medium in passociation with the selected mode of Intra prediction,coding data obtained subsequent to said transform operation,constructing a data signal containing said coding data and an index of said applied transform operation,transmitting said data signal to a decoding device,prior to coding the image, storing in the non-transitory computer-readable medium said set of transform operations in association with the selected mode of Intra prediction and a set of transform operations in association with the mode of Inter prediction, wherein the number of transform operations contained in the set of transform operations that is associated with said selected mode of Intra prediction is different from the number of transform operations contained in the set of transform operations that is stored in association with said mode of Inter prediction.

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