Chen-DCT 알고리즘을 이용한 H.264 Encoder 성능 개선에 관한 연구

Abstract

H.264 is standards for the coded representation of visual information. H.264/AVC is newest video coding standard of the ITU-T Video Coding Experts Group and the ISO/IEC Moving Picture Experts Group. Most important feature of H.264 standard include compression efficiency, transmission efficiency and a focus on popular applications of video compression. Only three profiles are currently supported, each targeted at a class of popular video communication applications. H.264 standard assume a CODEC 'model' that uses block-based motion compensation, transform, quantization and entropy coding. The purpose of the transform stage in video CODEC is to convert image or motion-compensated residual data into another domain. H.264 standard use DCT algorithm for transform stage. DCT is one of the most computational intensive parts of recent high quality digital Video coding techniques. In this paper, we propose an efficient DCT calculation algorithm for fast video encoding. In the proposes an implementation of DCT using a fast DCT algorithm with shift and addition operations instead of multiplications. The Chen-DCT which is the most commonly used among fast DCT algorithm has less multiplication and additions than standard DCT algorithm. And a method for reduce process-time has been an architecture of fast 2-D DCT processor using only 1-D DCT module. In thesis, video compression process time be reduced and unnatural distortion cannot be recognized.