METHOD FOR PREDICTIVE CODING OF DEPTH MAPS AND A DEPTH MAP ENCODER

摘要

A method for predictive encoding of a depth map, comprising the steps of: receiving a depth map; dividing the depth map to blocks; performing quad-tree decomposition of the depth map to sub-blocks; approximating each of the sub-blocks by a plane, the plane being associated with three plane points (p₀, p₁, p₂); providing an encoded depth map in a form of a set of planes defined by parameters. The method further comprises: determining an order of coding of the sub-blocks; and while encoding consecutive sub-blocks: calculating predictors ({circumflex over (p)}₀, {circumflex over (p)}₁, {circumflex over (p)}₂) for the plane points (p₀, p₁, p₂) of the currently-encoded sub-block (C); calculating differences (Δp₀, Δp₁, Δp₂) between the actual values of the plane points (p₀, p₁, p₂) and the values of the corresponding predictors ({circumflex over (p)}₀, {circumflex over (p)}₁, {circumflex over (p)}₂); providing the parameters of the plane for the currently-encoded sub-block (C) in form of the differences (Δp₀, Δp₁, Δp₂).