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