Title :
Markov random field estimation of lost DCT coefficients in JPEG due to packet errors
Author :
Yang, Jinwha ; Delp, Edward J.
Author_Institution :
Video & Image Process. Lab., Purdue Univ., West Lafayette, IN, USA
Abstract :
Interleaving is used before the encoding of source symbols in JPEG to reduce visual artifacts due to lost packets because interleaving distributes the locations of errors. The recovery of lost DCT coefficients in interleaved image compression is investigated in this paper. To restore the lost coefficients, an Maximum a Posteriori (MAP) estimate for the DCT coefficients is proposed. Under the assumption of a Gauss-Markov Random Field (GMRF) model in the pixel domain, the MAP estimate for the lost DCT coefficients is derived.
Keywords :
Gaussian distribution; Markov processes; data compression; discrete cosine transforms; image coding; maximum likelihood estimation; DCT coefficient; GMRF model; Gauss-Markov random field; JPEG; MAP estimation; interleaved image compression; maximum a posteriori; packet error; source symbol encoding; Automatic repeat request; Communication networks; Decoding; Discrete cosine transforms; Image coding; Image restoration; Interleaved codes; Laboratories; Markov random fields; Streaming media;
Conference_Titel :
Image Processing, 2004. ICIP '04. 2004 International Conference on
Print_ISBN :
0-7803-8554-3
DOI :
10.1109/ICIP.2004.1419420
