Low-complexity dictionary based lossless screen content coding

This paper presents a low-complexity lossless screen content coding method on top of a well structured dictionary based solution DictSCC. Both methods are implemented on the emerging High-Efficiency Video Coding (HEVC) Range Extensions (RExt) to demonstrate the coding efficiency. Compared with the DictSCC our scheme further explores the 2D correlation between neighboring image blocks for performance improvement, and reduces the complexity significantly by constraining the dictionary buffer which will be more favored by the hardware implementation. Results demonstrate averaged 17%, 10% and 8% bit rate reduction over HEVC for screen content compression with respect to All Intra, Random Access and Low-Delay encoder configurations.