基於人類交錯解析度視覺特性之三維立體視訊壓縮技術研究

Abstract

經由使用立體視訊的三維影像傳輸, 可以達成實際視覺的實現, 為建立 三維系統, 兩段影像 ( 左及右 ) 必須同步傳輸, 如此大的資料量必須 被降低, 為此創作出 適當的編碼三維影像的方式. 立體影像壓縮包含 了降低空間的非必須資料, 達成 比兩眼影像獨立壓縮較好的壓縮率, 為達到更好的壓縮效能, 我們應用了交錯解 析生理實驗的結果在立體 影像壓縮上, 這個實驗的結果顯示: 一眼高解析度影像 及一眼低解析 度影像可以維持不錯的深度感覺, 為此一眼的影像獨立的的應用運 動 補償來壓縮, 而另一眼則由前者來估計, 在低解析度上, 為執行交錯解析 編碼, 採用小波分析來作運動及視差的估計. 實驗的結果表示, 一般 影像的壓縮率在 90 左右, 而沒有顯著的 品質差距. Three-dimensional visual communications, made through the use of stereoscopiimages, are able to achieve total display realism. In order to create a 3-D system with two images ( left and right) that must be transmitted simultaneously, the large amount of information contained in the images must be reduced, and an efficient coding appropriate for stereoscopic images developed. Stereoscopic image sequence compression involves the exploitation of the spatial redundancy between the left and right image fames to achieve the compression ratio higher than that are by the independencompression of the two frames. In order to further achieve the higher compression ratio, in this paper, we empoly the mixed-resolution psychophysical experiments to the stereo image compression. The experiments have shown that a stereo image pair with one high resolution image and one lower resolution image is sufficient to provide good stereoscopic depth perception. Thus, one image sequence is compressed independent of the other sequence using the motion compensation, while the other sequence is estimated at a lower resolution from this stream using the low resolution disparity compensation. To implement the mixed-resolution coding, a wavelet multiresolution framework has been adopted to facilitate such an estimation of motion and disparity vectors at different resolutions. Experimental results indicate that the compression ratio for a typical stereoscopic image sequence is about 90, without any significant loss in the perceived 3D stereoscopic image quality.