DocumentCode :
3544966
Title :
Real-time image compression based on wavelet vector quantization, algorithm and VLSI architecture
Author :
Hatami, Safar ; Sharifi, Shervin ; Ahmadi, Hossein ; Kamarei, Mahmoud
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Tehran, Iran
fYear :
2005
fDate :
23-26 May 2005
Firstpage :
2381
Abstract :
We present an algorithm and VLSI architecture of a real-time image compression that is based on vector quantization (VQ) of discrete wavelet transform (DWT) coefficients. Containing the hardware of both wavelet and VQ, this architecture is capable of performing real-time image compression for grayscale and 24 bit color images with a resolution of 1024×1024 pixels. The algorithm for 2D DWT is a lifting-based non-separable 2D DWT. Difference-codebook binary tree search VQ (DC-BTSVQ) is used in the algorithm which leads to a high speed encoder. Binary tree search VQ (BTSVQ) also requires low hardware overhead in VLSI implementation. The proposed real-time wavelet vector quantization (WVQ) algorithm combines multistage VQ (MSVQ) and classified VQ (CVQ). MSVQ encodes the lowest frequency subbands of the wavelet coefficients and has the advantage of robustness to wireless channel fading. CVQ encodes the higher frequency subbands and results in higher coding efficiency.
Keywords :
VLSI; data compression; discrete wavelet transforms; fading channels; image coding; image colour analysis; transform coding; tree searching; vector quantisation; visual communication; 1024 pixel; 1048576 pixel; DWT coefficients; VLSI architecture; classified VQ; coding efficiency; color images; difference-codebook binary tree search VQ; discrete wavelet transform coefficients; grayscale images; image communication; lifting-based nonseparable 2D DWT; multistage VQ; real-time image compression; wavelet vector quantization; wireless channel fading; Binary trees; Color; Discrete wavelet transforms; Frequency; Gray-scale; Hardware; Image coding; Image resolution; Vector quantization; Very large scale integration;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
Type :
conf
DOI :
10.1109/ISCAS.2005.1465104
Filename :
1465104
Link To Document :
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