A Fast and High Quality Method for Motion-JPEG to H.264/AVC Transcoding

• Main Authors: Tsung-Ming Lee, 李宗明
• Other Authors: Chi-Fang Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/42943568052101325253

碩士 === 元智大學 === 資訊工程學系 === 98 === In this research, we proposed a method to convert MJPEG to H.264 standard streaming format, which can retain the high-quality of the original JPEG images, and have the characters of low complexity while transcoding. Based on the findings of the previous research [17], we have continued the research and propose an enhancement in processing speed and transcoding quality. The method includes: (1) avoiding unnecessary pixel decoding, and directly calculating the correct predictive value from the coefficient values within the DCT block, which can significantly save the processing time and memory space; and (2) deriving an revised matrix to reduce the differences of DCT between JPEG and H.264. This revision can significantly improve the video quality after transcoding. The superiority of this method can be verified by the experimental results.