Title :
Selective requantization for transcoding of MPEG compressed video
Author :
Sorial, Hani ; Lynch, William E. ; Vincent, A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
Abstract :
The paper addresses the problem of bit-rate conversion of MPEG compressed video. We present selective requantization, a method for reducing the requantization errors in transcoding. The proposed method is based on avoiding critical ratios of the two cascaded quantizations (encoding versus transcoding) that either lead to larger transcoding errors or require a higher bit budget. Results show that selective requantization improves the quality of the transcoded images. The presented method is simple to implement and does not require side information
Keywords :
data compression; quantisation (signal); video coding; MPEG compressed video transcoding; bit budget; bit-rate conversion; cascaded quantizations; critical ratios; requantization errors; selective requantization; transcoded image quality; transcoding errors; Bit rate; Cost function; Discrete cosine transforms; Image coding; Laplace equations; Quantization; Transcoding; Transform coding; Video coding; Video compression;
Conference_Titel :
Multimedia and Expo, 2000. ICME 2000. 2000 IEEE International Conference on
Conference_Location :
New York, NY
Print_ISBN :
0-7803-6536-4
DOI :
10.1109/ICME.2000.869582