Title :
Removal of blocking artifacts of DCT transform by classified space-frequency filtering
Author :
Lai, Yung-Ka ; Li, Jin ; Kuo, C. C Jay
Author_Institution :
Signal & Image Process. Inst., Univ. of Southern California, Los Angeles, CA, USA
fDate :
Oct. 30 1995-Nov. 1 1995
Abstract :
Image compression techniques based on block discrete cosine transform (BDCT) are widely used today. However, visually annoying blocking artifacts appear when the compression ratio is high. We propose an iterative method to remove these artifacts using block classification and space-frequency filtering. The new method is better than POCS (projections onto convex sets) and regularization methods in visual appearance as well as objective error measures.
Keywords :
image coding; BDCT; DCT transform; POCS; block classification; block discrete cosine transform; blocking artifacts removal; classified space-frequency filtering; compression ratio; image compression; iterative method; objective error measures; projections onto convex sets; regularization methods; Convergence; Discrete cosine transforms; Filtering; Filters; Frequency domain analysis; Image coding; Karhunen-Loeve transforms; Quantization; Smoothing methods; Transform coding;
Conference_Titel :
Signals, Systems and Computers, 1995. 1995 Conference Record of the Twenty-Ninth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-8186-7370-2
DOI :
10.1109/ACSSC.1995.540939
