DocumentCode :
2701603
Title :
Improving the image quality of block-based video coders by exploiting interblock redundancy
Author :
Kutka, R. ; Kaup, A. ; Hager, M.
Author_Institution :
Corp. Res. & Dev., Siemens AG, Munich, Germany
fYear :
1996
fDate :
4-5 Sep 1996
Firstpage :
48
Lastpage :
56
Abstract :
Narrowband video transmission via ISDN or wireless channels requires high compression factors. Common block-based coders achieve this by taking account of the statistical correlations within the image blocks. Correlations between neighbouring image blocks, however, are neglected. We present an approach using discrete cosine transforms which takes advantage of this additional information hidden in the statistical dependencies between neighbouring blocks in order to improve the image quality of the decoder. The luminance of the current block to be coded is predicted from the surrounding image blocks in order to correct coding errors. By this means the annoying blocking artefacts will be reduced. A smooth and well-balanced image display results. At the same time edges of real objects are undisturbed, thus the sharpness remains
Keywords :
correlation methods; data compression; discrete cosine transforms; edge detection; error correction; image enhancement; redundancy; statistical analysis; transform coding; video coding; visual communication; DCT; ISDN; block-based video coders; blocking artefacts; coding errors; compression factor; discrete cosine transforms; edges; image blocks; image quality; interblock redundancy; luminance; narrowband video transmission; neighbouring blocks; real objects; sharpness; smooth well-balanced image display; statistical dependencies; wireless channels; Decoding; Discrete cosine transforms; Frequency estimation; ISDN; Image coding; Image quality; Polynomials; Redundancy; Video compression; Videoconference;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Wireless Image/Video Communications, 1996., First International Workshop on
Conference_Location :
Loughborough
Print_ISBN :
0-7803-3610-0
Type :
conf
DOI :
10.1109/WIVC.1996.624642
Filename :
624642
Link To Document :
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