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Titolo:
2ND-ORDER DERIVATIVE-BASED SMOOTHNESS MEASURE FOR ERROR CONCEALMENT IN DCT-BASED CODECS
Autore:
ZHU WW; WANG Y; ZHU QF;
Indirizzi:
AT&T BELL LABS,LUCENT TECHNOL,CRAWFORDS CORNER RD HOLMDEL NJ 07733 POLYTECH UNIV,DEPT ELECT ENGN BROOKLYN NY 11201 PICTURETEL CORP ANDOVER MA 01810
Titolo Testata:
IEEE transactions on circuits and systems for video technology
fascicolo: 6, volume: 8, anno: 1998,
pagine: 713 - 718
SICI:
1051-8215(1998)8:6<713:2DSMFE>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
RECOVERY;
Keywords:
DCT-BASED CODEC; ERROR CONCEALMENT; IMAGE COMMUNICATIONS; PACKET LOSS RECOVERY; 2ND-ORDER DERIVATIVE; SMOOTHNESS MEASURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
W.W. Zhu et al., "2ND-ORDER DERIVATIVE-BASED SMOOTHNESS MEASURE FOR ERROR CONCEALMENT IN DCT-BASED CODECS", IEEE transactions on circuits and systems for video technology, 8(6), 1998, pp. 713-718

Abstract

In this paper, we study the recovery of lost or erroneous transform coefficients in image and video communication systems employing discrete cosine transform (DCT)-based codecs, Previously, we have developed atechnique that exploits the smoothness property of image signals and recovers the damaged blocks by maximizing a smoothness measure. There,the first-order derivative was used as the smoothness measure, which can lead to the blurring of sharp edges. In order to alleviate this problem, we propose to use second-order derivatives as the smoothness measure. Our simulation results show that a weighted combination of the quadratic variation and the Laplacian operator can significantly reduce the blurring across the edges while enforcing smoothness along the edges.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:10:36