Pre-Scene Color Buffer Compression

Memory bandwidth is often the bottleneck of computer graphics systems.Various methods used for reducing the bandwidth consumption are summarized in this paper.A pre-scene color buffer compression scheme, named YCoCg-R CBC, is proposed on the basis of the texture compression method S3TC.By the method, two data formats for color buffer compression are defined, and the pixels are transformed to YCoCg-R color space.Afterwards the luma data and chroma data are handled separately, with the luminance possessing higher accuracy.Experiment results show that the average PSNR scores of YCoCg-R CBC format I and format Ⅱ are 41.71 dB and 47.24 dB respectively, with an improvement of 7.87 dB and 13.40 dB in comparison with S3TC.The quality of the images decompressed is significantly improved, and as a result, the difference from the original ones is hardly perceived.