hybrid wavelet-fractal coder (WFC) for image compression is proposed in this research. The WFC uses the fractal contractive mapping to predict the wavelet coefficients of the higher resolution from those of the lower ...
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hybrid wavelet-fractal coder (WFC) for image compression is proposed in this research. The WFC uses the fractal contractive mapping to predict the wavelet coefficients of the higher resolution from those of the lower resolution and then encode the prediction residue with a bitplane waveletcoder. The fractal prediction is adaptively applied only to regions where the fate saving offered by fractal prediction justifies its overhead. A rate-distortion criterion is derived to evaluate the fractal rate saving and used to select the optimal fractal parameter set for WFC. The superior performance of WFC is demonstrated with extensive experimental results.
In this work a lossless wavelet-fractal image coder is proposed. The process starts by compressing and decompressing the original image using wavelet transformation and fractal coding algorithm. The decompressed image...
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In this work a lossless wavelet-fractal image coder is proposed. The process starts by compressing and decompressing the original image using wavelet transformation and fractal coding algorithm. The decompressed image is removed from the original one to obtain a residual image which is coded by using Huffman algorithm. Simulation results show that with the proposed scheme, we achieve an infinite peak signal to noise ratio (PSNR) with higher compression ratio compared to typical lossless method. Moreover, the use of wavelet transform speeds up the fractal compression algorithm by reducing the size of the domain pool. The compression results of several welding radiographic images using the proposed scheme are evaluated quantitatively and compared with the results of Huffman coding algorithm.
A new hybrid wavelet-fractal coder (WFC) for image compression is proposed in this research. We show that the application of contractive mapping for interscale wavelet prediction in the wavelet domain offers bit rate ...
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ISBN:
(纸本)0819424358
A new hybrid wavelet-fractal coder (WFC) for image compression is proposed in this research. We show that the application of contractive mapping for interscale wavelet prediction in the wavelet domain offers bit rate savings in some regions. The prediction residue is then quantized and encoded by traditional waveletcoders. WFC allows the flexibility to choose either direct coding of wavelet coefficients or fractal prediction followed by residual coding to achieve a better rate-distortion (R-D) performance. A criterion of low complexity is derived to evaluate the R-D efficiency of fractal prediction. The superior performance of WFC is demonstrated with extensive experimental results.
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