Detection and Concealment Technique for MPEG-2 Bit Stream Error

• Main Authors: Wann, Shyue-Mau, 萬學茂
• Other Authors: Ja-Ling Wu
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/87591272144498060831

碩士 === 國立臺灣大學 === 資訊工程學系研究所 === 86 === As the data are highly compressed in MPEG-2, bit-stream errors will result in a great degradation to the video sequence. The objective of this thesis is to recover high-quality MPEG-2 images from corresponding corrupted MPEG-2 images, without increasing the transmission bit rate and modifying the standard coders .Based on the smoothness of common image signals, the damaged blocks are ident ified by a generic error detection technique. After the damaged block is deter mined by error detection, we try to recover each damaged block by minimizing t he intersample variation within the block and across the blockboundaries. That is, the corrupted DCT coefficients can be recovered by sloving a set of linea r equations. The simulation results show that the quality of the recovered seq uence is subjectively acceptable.