DocumentCode :
1616578
Title :
Adaptive modulus quantizer design for matching pursuit video coding
Author :
Neff, R. ; Zakhor, Avideh
Author_Institution :
Dept. of Electr. Eng., California Univ., Berkeley, CA, USA
Volume :
2
fYear :
1999
Firstpage :
81
Abstract :
Overcomplete signal decomposition using matching pursuits has been shown to be an efficient technique for coding motion residual images in a hybrid video coder. Unlike orthogonal decomposition where computation of the transform coefficients is decoupled from quantization, matching pursuit uses an in-loop quantizer which must be specified before coding begins. Optimal quantizer design thus depends on the computed matching pursuit coefficients, but these in turn depend on the chosen quantizer. To resolve this interdependency, we propose frame-adaptive quantization for matching pursuit based on adaptive dead-zone subtraction followed by uniform threshold quantization. Practical 2-pass and 1-pass algorithms are developed which jointly find the quantizer parameters and the number of coded basis functions which minimize coding distortion for a given rate. The compromise 1-pass scheme performs nearly as well as the full 2-pass algorithm, but with the same complexity as a fixed quantizer design. The adaptive schemes are shown to outperform the fixed quantizer used in earlier works, especially at high bit rates where the gain is up to 1.7 dB.
Keywords :
adaptive signal processing; quantisation (signal); video coding; 1-pass scheme; adaptive modulus; hybrid video coder; matching pursuit; motion residual images; quantizer design; video coding; Bit rate; Dictionaries; Discrete cosine transforms; Discrete transforms; Image coding; Image reconstruction; Matching pursuit algorithms; Quantization; Signal resolution; Video coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Image Processing, 1999. ICIP 99. Proceedings. 1999 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-7803-5467-2
Type :
conf
DOI :
10.1109/ICIP.1999.822859
Filename :
822859
Link To Document :
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