Ray-space 數(shù)據(jù)片內(nèi)和片間相關(guān)性壓縮分析

Ray-space 數(shù)據(jù)特征分析表明其片內(nèi)和片間均存在很大相關(guān)性并且其數(shù)據(jù)有明顯的方向
性特征通過(guò)最優(yōu)宏塊分割不同精度的塊匹配和多參考片預(yù)測(cè)結(jié)果分析討論了適合Ray-space數(shù)據(jù)特點(diǎn)的片內(nèi)和片間預(yù)測(cè)技術(shù)與傳統(tǒng)的只利用片內(nèi)相關(guān)性的壓縮技術(shù)相比利用上述兩類(lèi)相關(guān)性并結(jié)合Ray-space 數(shù)據(jù)方向性特征能進(jìn)一步提高編碼壓縮效率在獲得相同重建圖像質(zhì)量下可使基于H.264 的Ray-space 壓縮方法比基于H.263 的方法在碼率上節(jié)省50% 比JPEG 的方法節(jié)省75%左右.

Analysis of characteristics of Ray-space indicates that there are high intra correlations within
a slice of Ray-space, as well as inter correlations between adjacent slices, and significant directionality characteristic in Ray-space data. Through analyzing optimal macroblock segmentation, block matching with different precision and multi-slices prediction, the techniques of intra-slice and inter slice predications suited to Ray-space compression are discussed. Compared with traditional Ray-space coding techniques only utilizing intra-slice correlations, the Ray-space coding efficiency can be further improved if the two correlations are used combined with the directionality characteristic of Ray-space.
In addition, compared with Ray-space compression method based on H.263, Ray-space compression method based H.264 can save 50% bit rate at the same reconstruction quality of Ray-space, and the economization is about 75% in comparison with JPEG.