22 October 1993 Fractal-based image coding with polyphase decomposition
Author Affiliations +
Proceedings Volume 2094, Visual Communications and Image Processing '93; (1993) https://doi.org/10.1117/12.157877
Event: Visual Communications and Image Processing '93, 1993, Cambridge, MA, United States
Abstract
A new method for fractal image compression by applying Jacquin's algorithm to a polyphase decomposed image is proposed to increase the encoding efficiency in this research. By using a (P X P) : (1 X 1) polyphase decomposition with P equals 2n, we divide an image into P X P subimages and then apply the Jacquin compression algorithm to these subimages independently. We show that the resulting scheme can improve the coding speed by a factor of P2 at the sacrifice of the decompressed image quality. Besides, since the subimages are very similar to each other, we may focus on a small subset of subimages, seek the appropriate domain block for their range blocks, and record the information of address mapping, scaling and offset. To encode the remaining subimages, we simply determine the scaling and the offset based on the same set of addressing mapping previously found. A set of numerical experiments with various parameters, including the polyphase decimation factor P, the size D (or R) of domain (or range) blocks, and the size s of search step, are performed to illustrate the tradeoff between the speed, image quality, and compression rate.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kwo-Jyr Wong, Ching-Han Lance Hsu, C.-C. Jay Kuo, "Fractal-based image coding with polyphase decomposition", Proc. SPIE 2094, Visual Communications and Image Processing '93, (22 October 1993); doi: 10.1117/12.157877; https://doi.org/10.1117/12.157877
PROCEEDINGS
12 PAGES


SHARE
RELATED CONTENT

Genetic algorithms for fast search in fractal image coding
Proceedings of SPIE (February 27 1996)
Image compression using hybrid vector quantization with DCT
Proceedings of SPIE (September 30 2011)
Subband finite-state vector quantization
Proceedings of SPIE (September 16 1994)
An eliminated fractal compression algorithm by variance
Proceedings of SPIE (September 25 2003)

Back to Top