Line-Adaptive Color Transforms for Lossless Frame Memory Compression

摘要

This paper proposes line-adaptive color transforms for lossless frame memory compression. Line-based compression methods are necessary for reducing memory requirement for display devices. A color transform is not included in the existing lossless frame memory compression based on the modified Hadamard Transform (MHT) and adaptive Golomb-Rice (AGR) coding. To achieve the better coding efficient for a line-based lossless compression, a method of line-adaptive color transforms is essential. By applying a lossless color transform with the best compression ratio in each line, it achieves higher compression efficiency. This paper describes the analysis of eight color transforms in terms of compression performance for the proposed method. Experimental results show that the proposed method provides reduced bitrate compared with the existing method without a color transform.