Rotate Intra Block Copy for Still Image Coding
Author(s)Zhang, Zhengdong; Sze, Vivienne
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This paper proposes a method called rotate intra block copy, which extends the intra block copy technique by making the block matching process invariant to rotation. HEVC intra prediction plus rotate intra block copy gives an average of 20% reduction in residual energy (i.e. prediction error) compared to HEVC intra prediction plus intra block copy. As the motion vector correlation in rotate intra block copy is different from the intra block copy, a new method of motion vector coding is presented. The impact of angular resolution on residual energy reduction is also evaluated. In a full codec pipeline, this reduction in residual energy translates into a coding gain in BD-rate of 3.4% over HEVC intra prediction plus intra block copy for both screen content and camera-captured gray scale images.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Proceedings of the IEEE International Conference on Image Processing (ICIP)
Institute of Electrical and Electronics Engineers (IEEE)
Zhang, Zhengdong, and Vivienne Sze. "Rotate Intra Block Copy for Still Image Coding." IEEE International Conference on Image Processing (ICIP) (September 2015).
Author's final manuscript