Title :
Improved Chen-Smith image coder
Author :
Rubino, Eduardo M. ; Malvar, Henrique S. ; De Queiroz, Ricardo L.
Author_Institution :
Dept. de Engenharia Eletrica, Brasilia Univ., Brazil
Abstract :
An image compression system based on transform coding and zonal sampling is presented. It is based on the Chen-Smith coder, but with an improved technique for transform coefficient quantization and the replacement of the discrete cosine transform (DCT) by the lapped orthogonal transform (LOT). The system leads to signal-to-noise ratios that are from 1.5 to 2.0 dB above those obtained with the standard JPEG algorithm, for a wide variety of test images and compression rates
Keywords :
data compression; image coding; image sampling; transform coding; Chen-Smith image coder; compression rates; image compression system; lapped orthogonal transform; signal-to-noise ratios; test images; transform coding; transform coefficient quantization; zonal sampling; Bismuth; Bit rate; Code standards; Decoding; Discrete cosine transforms; Discrete transforms; Image coding; Quantization; Signal processing algorithms; Transform coding;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393709
