Title :
Practical nonunitary filter banks for subband coding of images
Author :
Ramstad, Tor A. ; Saltnes, Einar ; Aase, Sven O.
Author_Institution :
Dept. of Telecommun., Norwegian Inst. of Technol., Trondheim, Norway
Abstract :
The paper presents a filter bank for subband image coding which has a number of nice properties including simple implementation, high coding gain, no blocking effects, and limited ringing. All these properties can be obtained only because the filter bank is nonunitary and can be optimized for different task in the encoder and the decoder. The complexity is minimized in the decoder filter bank by forcing it into a form where most channels are equal to the channels in the standard cosine transform
Keywords :
computational complexity; decoding; digital filters; filtering and prediction theory; image coding; minimisation; video signals; blocking effects; channels; coding gain; decoder; encoder; image coding; implementation; nonunitary filter banks; ringing; subband coding; Bit rate; Channel bank filters; Decoding; Filter bank; Finite impulse response filter; Image coding; Karhunen-Loeve transforms; Quantization; Signal generators; Transform coding;
Conference_Titel :
Signals, Systems and Computers, 1993. 1993 Conference Record of The Twenty-Seventh Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-4120-7
DOI :
10.1109/ACSSC.1993.342442
