一個利用動作補償來達成影片更新率提高的方法

Abstract

近年來新的電視系統的興起，為了追求更好的影片品質，新的電視播放系統有著較高的更新率(frame rate)。為了讓更新率較低的影片可以順利地在新系統播放，更新率的提高(frame rate up-conversion)是必要的。在這篇論文裡，我們將利用影片壓縮的技巧內插生成補圖，來達到更新的提高。為了容易研究與使用，我們亦發展了一個方便使用的系統。

Frame rate up-conversion (FRC) is a conversion between any two display formats with different frame rates. For improving visual quality, the frame rate required for high definition television (HDTV) is much higher than the current frame rate. That is, the frame rate should be up-converted in HDTV. In this thesis, we present a frame interpolation algorithm for FRC. In the proposed scheme, forward motion estimation (ME) is performed to generate the motion vectors (MVs) that determine how the frame will be interpolated. Based on the naturally perceptual scene, we set a threshold for ME, and only refer to one frame information when the interpolation frame is constructed in the process of motion compensated (MC). To solve the problem of overlapped and hole regions introduced in MC, a weighted average compensation technique is presented to process the overlapped regions, and a block based algorithm is provided to process the hole regions. Moreover, the overlapping block ME improves the quality of FRC. Finally, experimental results of the proposed method are compared with the results of the hierarchical motion compensated frame interpolation (HMCFI) method. The PSNR of the interpolated frames by the proposed method and by HMCFI are near enough, however, the proposed method provides a better perception result.