| Paper: | TA-P5.8 |
| Session: | Video Coding II |
| Time: | Tuesday, September 18, 09:50 - 12:30 |
| Presentation: |
Poster
|
| Title: |
HYBRID VARIABLE LENGTH CODING IN VIDEO COMPRESSION USING VARIABLE BREAKPOINT |
| Authors: |
Dihong Tian; Cisco Systems, Inc. | | |
| | Pi Sheng Chang; Cisco Systems, Inc. | | |
| | Wen Chen; Cisco Systems, Inc. | | |
| Abstract: |
Hybrid variable length coding (HVLC) was recently proposed as a novel entropy coding scheme for block-based image and video compression, in observation of the inefficiency of the conventional run-level variable length coding scheme in coding consecutive nonzero transform coefficients. In HVLC, each transform block is partitioned into low-frequency and high-frequency regions, and the coefficients in the two regions are coded separately by different schemes. The partition of the transform block was performed based on a predefined, constant breakpoint. In this paper, we propose to partition the transform block using a variable breakpoint that is adaptive to the local context. We present a method to find one optimal breakpoint per transform block or per multi-block partition efficiently, and we show that by using variable breakpoint, the efficiency of HVLC can be improved considerably compared to the constant breakpoint case. |
