Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2016
Session Number:M2-4
Session:
Number:M2-4-3
Efficient Schemes for Bypass Flag Read and Write for 1-D Lossless Frame Memory Compression in the Hardware-based Video Encoder
Ji Hun Jang, Chae Eun Rhee ,
pp.185-188
Publication Date:2016/7/10
Online ISSN:2188-5079
Summary:
The frame memory compression (FMC) is one of solutions to mitigate the memory size and bandwidth burdens for the reference frames used in the inter-prediction. The lossless FMC keeps the image quality, whereas the compression ratio is not guaranteed. In the worst case, the required memory size with FMC is more than that without FMC. To manage this case, the encoding step can be bypassed and the uncompressed data are stored with bypass flags. Mostly, the overhead from bypass flags depends on the size of compression units. However, if the bypass flags are stored to the external memory and writing and reading are done through the system bus, the trade-off between internal memory space and bus bandwidth needs to be considered carefully. In this paper, the schemes for bypass flag read and write are proposed to reduce the bandwidth effectively with a reasonable internal memory overhead.