Title :
Directionally classified image vector quantisation using Walsh Hadamard subspace distortion
Author :
Po, L.M. ; Chan, Calvin K.
Author_Institution :
Dept. of Electron. Eng., City Polytech. of Hong Kong, Kowloon Tong, Hong Kong
Abstract :
A novel directionally classified subspace image vector quantisation coding scheme using a new gradient based edge classifier and Walsh Hadamard transform subspace distortion measures is proposed. The new coding scheme can reduce both the computational complexity and memory requirement of the conventional classified vector quantisation technique while the reproduced image quality is maintained.
Keywords :
Walsh functions; data compression; encoding; picture processing; transforms; Walsh Hadamard subspace distortion; computational complexity; directionally classified subspace image vector quantisation coding; gradient based edge classifier; memory requirement; reproduced image quality;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19911218
