Methods and apparatuses for coding and decoding depth map

A method for decoding a depth map provided by an apparatus executing instructions stored in a non-transitory, computer-readable storage medium so as to configure a processor to provide the method of:

• obtaining prediction data of a current image block of the depth map;
• determining according to an intra-frame prediction mode of the current image block, whether the intra-frame prediction mode belongs to a preset intra-frame prediction mode set, wherein in the case that the intra-frame prediction mode belongs to the preset intra-frame prediction mode set, determining a predicted pixel value from the obtained prediction data according to a preset step;
• obtaining a first average value of the prediction data according to the predicted pixel value, wherein the preset step is determined based on a size of the current image block;
• obtaining a residual of the current image block;
• and
• obtaining a pixel value of a pixel of the current image block according to the first average value of the prediction data and the residual of the current image block.

An apparatus for decoding a depth map comprising a processor and a memory with stored instructions which when executed by the processor cause the processor to:

• obtain prediction data of a current image block of the depth map;
• determine, according to an intra-frame prediction mode of the current image block, whether the intra-frame prediction mode belongs to a preset intra-frame prediction mode set, wherein in the case the intra-frame prediction mode belongs to the preset intra-frame prediction mode set, determine a predicted pixel value from the obtained prediction data according to a preset step;
• obtain a first average value of the prediction data according to the predicted pixel value, wherein the preset step is determined based on a size of the current image block, and
• obtain a residual of the current image block, and obtain a pixel value of a pixel of the current image block according to the first average value of the prediction data and the residual of the current image block.