Title :
Adaptive discrete cosine transform coding with vector quantization for color images
Author :
Aizawa, Kiyoharu ; Harashima, Hiroshi ; Miyakawa, Hiroshi
Author_Institution :
University of Tokyo, Tokyo, Japan
Abstract :
A new vector quantization scheme in discrete cosine transform domain, named DCT-VQ and its application to color image coding are described. In this scheme, DCT-domain is partitioned into vectors which are normalized and vector-quantized using universal vector quantizers designed with multidimensional Laplacian distribution. Adaptive coding scheme is also introduced to obtain better reconstruction of images. The color image coder employs the above scheme and encodes separately three components converted from R,G,B signals. The simulations have shown that adaptive DCT-VQ exhibits better performance than a conventional adaptive cosine transform coding with scalar quantization. The decomposition of DCT-block into vectors results in much less complex coder than a vector quantizer in original space domain.
Keywords :
Adaptive coding; Color; Discrete cosine transforms; Image coding; Image converters; Image reconstruction; Laplace equations; Multidimensional systems; Transform coding; Vector quantization;
Conference_Titel :
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.
DOI :
10.1109/ICASSP.1986.1168969