Key-point Detection based Fast CU Decision for HEVC Intra Encoding

As the most recent video coding standard, High Efficiency Video Coding (HEVC) adopts various novel techniques, including a quad-tree based unit (CU) structure and additional angular modes used for intra encoding. These new techniques achieve notable improvement in efficiency at penalty of significant computational complexity increase. Thus, fast HEVC algorithm is highly desirable. In this paper, we propose CU decision to reduce complexity, mainly on key-point detection. A block considered have multiple gradients early split if corner points are detected inside block. On other hand, without treated be terminated when its RD cost also small according statistics previous frames. The proposed achieves over 62% encoding time reduction with 3.66%, 2.82%, 2.53% BD-Rate loss Y, U, V components, averagely. experimental results show that method efficient decide size coding, even though only static parameters applied all test sequences.