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This paper proposes 'Coding Unit Tree' based on quadtree efficiently with motion vector to represent splitting information of a Coding Unit (CU) in HEVC. The new international video coding, High Efficiency Video Coding (HEVC), adopts various techniques and new unit concept: CU, Prediction Unit (PU), and Transform Unit (TU). The basic coding unit, CU is larger than macroblock of H.264/AVC and it splits to process image-based quadtree with a hierarchical structure. However, in case that there are complex motions in CU, the more signaling bits with motion information need to be transmitted. This structure provides a flexibility and a base for a optimization, but there are overhead about splitting information. This paper analyzes those signals and proposes a new algorithm which removes those redundancy. The proposed algorithm utilizes a type code, a dominant value, and residue values at a node in quadtree to remove the addition bits. Type code represents a structure of an image tree and the two values represent a node value. The results show that the proposed algorithm gains 13.6% bit-rate reduction over the HM-1.0.

This paper proposes a new progressive transmission with quadtree in order to improve progressive transmission of an image in two viewpoints of bit-plane and spatial transmission, in addition to compression efficiency. The scheme of this paper is based on a compact complementary quadtree(CCQ) with a bitplane coding. Basically, quadtree includes a function of progressive transmission with multilevel function. CCQ improves this function and this paper uses bit-plane coding for efficient progressive transmission of bitplane and spatial. Experimental results demonstrate that the new scheme is quite competitive to and often outperforms other good image coders in the literature.