Title :
A VQ/DCT coding scheme for colour images
Author_Institution :
Loughborough Univ. of Technol., UK
Abstract :
A VQ/DCT (vector quantization/discrete cosine transform) coding scheme for color images is examined. In this coding scheme, VQ is first employed to code a 24-bits/pixel color image, which is composed of three components, R, G, B, into an 8-bits/pixel index image. Then the DCT is applied to the index image. One major problem in this coding scheme is that the codebook produced by the VQ process is randomly arranged. Using this codebook to VQ-code color images destroys the correlation present in the original images. Some techniques for producing a codebook which retains a reasonable degree of correlation are proposed
Keywords :
colour; data compression; encoding; picture processing; transforms; DCT; VQ; codebook; coding; colour images; correlation; discrete cosine transform; index image; picture processing; vector quantisation; Books; Color; Decoding; Discrete cosine transforms; Image coding; Image storage; Pixel; Predictive coding; Testing; Wideband;
Conference_Titel :
Communications, 1991. ICC '91, Conference Record. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0006-8
DOI :
10.1109/ICC.1991.162366
