A Modified Fractal Transformation to Improve the Quality of Fractal Coded Images
نویسندگان
چکیده
The Discrete Fractal Transformation has recently emerged as a powerful technique for coding images. The scheme works by dividing an image into blocks and making use of a contraction mapping by which the domain blocks are mapped into range blocks. During this process it is usual to filter the domain blocks. In this work, we show how a change in the filtering procedure can improve the image quality of fractal coding methods based on the mentioned transformation. After a presentation of the discrete fractal transformation, we explain the change and we apply it to the quadtree-based fractal scheme obtaining improvements in PSNR that can reach 1 dB when compared with the results obtained by traditional filtering.
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