An Image Fractal Coding Approach Based on Wavelet Transformation and Quad-tree

It can take advantage of wavelet transformation and fractal to code.The lowest resolution subband apply symmetric quantization coding.A threshold is defined for the high resolution subband.If the wavelet coefficient is not more than the threshold,it is replaced by zero.If it is more than the threshold,it apply fractal coding with quad-tree.Experiments show that the computing speed and the quality of decoding image are improved.