Fast fractal coding method based on adaptive threshold
Junfeng Zhang · Applied science and technology · 2007
The statistical characteristic of image child-blocks shows that the variance keeps unchanged in the conversion process of father-blocks.With this feature,the number of candidate blocks in matching base can be reduced. Therefore an improved algorithm for fractal image coding is proposed based on adaptive threshold,in which the matching threshold can be determined by the variance of child-blocks.Experimental results indicate that the performance of PSNR of recovered images is improved while the compression ratio is approximately constant,and the coding time is shortened.