Architectural design of fractal image coder based on kick-out condition

In recent years, fractal image coding has been applied in many applications. Fractal encoding needs a large search and comparison time, so it is therefore required to implement the encoder in hardware to improve the speed. This paper is intended to propose a novel architectural design of fractal image coder based on the predetermined kick-out condition which can reduce the computational load. We devise a technique to encode the mean of the range block by the fractal image coding format to save a bit which is used to indicate whether the range block is encoded by its mean or fractal image coding. We also present the order of eight isometric transformations to save the power consumption of multipliers when computing the product term to obtain the optimal contrast scaling factor. Finally, experimental results are demonstrated to show the effectiveness of the fractal image coder design.