15 April 2010.ppt

Introduction The basic idea of proposed technique has been implemented in A111 Natural image contains plentiful texture Object’s boundary always divides a block into irregular partitions Conventional quad-tree structured representation can not deal with those cases efficiently General idea Use more flexible block partitions for inter-frame coding A rectangular block can be divided into irregular partitions two triangles two unsymmetrical size rectangles one triangle and one pentagon FMP mode coding Representation of boundary’s position Boundary between two blocks can be controlled by points a and b Use two position parameters’ value and symbol to locate the position of points a and b Two position parameters (xpos, ypos) are coded FMP mode coding (continue) Simplified representation of boundary’s position +45 degree partitioning: (1, pos) -45 degree partitioning: (pos, 1) Vertical partitioning: (pos, 0) Horizontal partitioning: (0, pos) Predictive coding of the position parameter Use neighboring blocks’ position parameter to form the predictor for that of the current macroblock Motion Vector Predictor The motion vectors of neighboring blocks, which has same FMP mode as that of current macroblock, are used to form current macroblock’s motion vector predictor The position parameters of neighboring blocks are also used to form current macroblock’s motion vector predictor Experiment Test condition Implemented in KTA2.6r1 Implemented on 16x16 blocksize +/- 45 degree partitioning, vertical partitioning and horizontal partitioning are used Configure to CfP Beta’s configuration 5 QP points are chose for every sequences, QP values are same as CfP Beta anchors Experiment (continue) Closing remarks FMP provides more flexible macroblock partitioning FMP can get satisfied coding efficiency at the areas with plentiful texture Implemented on P frame Compression efficiency can be further improved after integrating FMP to 8x8 block and 32x32 block 封面英文标题: 字体:Arial