A New Image Coding Technique Unifying Fractal and Transform Coding
نویسندگان
چکیده
We present a new image coding scheme based on an unification of fractal and transform coding. We introduce a generalization of the luminance transformation used by fractal coding schemes. By extending the luminance transformation to the frequency domain, fractal and transform coding become subsets of the proposed transformation. Our new coding scheme FTC (fractal based transform coding) combines the advantages of both techniques. Compared to JPEG a coding gain of 1.5-2.5 dB [PSNR] is obtained. The encoding time is reduced compared to conventional fractal coding schemes and a better convergence at the decoder is attained. At equal error rates the subjective quality of images coded with the new scheme is superior compared to transform coded images.
منابع مشابه
Comparison of Wavelet Transforms and Fractal Coding in Texture-Based Image Retrieval
Image compression techniques based on wavelet and fractal coding have been recognized signiicantly useful in image texture classiication and discrimination. In fractal coding approach, each image is represented by a set of self-transformations through which an approximation of the original image can be reconstructed. These transformations of images can be utilized to distinguish images. The fra...
متن کاملBased on Wavelet Transform and Fractal Theory Image Compression Coding
This paper study the application of wavelet transform and fractal theory in image coding. The image coding based on wavelet transform has been studied firstly, Then, the paper make a research of fractal theory counterpart. After that, this paper research the hybrid compression coding based on wavelet transform and fractal theory, also make simulation experiment of three image coding ways mentio...
متن کاملProceedings of the \nato Asi on Fractal Image Encoding and Analysis" to Appear in Fractals F Entropy Constrained Fractal Image Coding
In this paper we present an entropy constrained fractal coding scheme. In order to get high compression rates, previous fractal coders used hierarchical coding schemes with variable range block sizes. Our scheme uses constant range block sizes, but the complexity of the fractal transformations is adapted to the image contents. The entropy of the fractal code can be signiicantly reduced by intro...
متن کاملEfficient Fractal Image Coding using Fast Fourier Transform
The fractal coding is a novel technique for image compression. Though the technique has many attractive features, the large encoding time makes it unsuitable for real time applications. In this paper, an efficient algorithm for fractal encoding which operates on entire domain image instead of overlapping domain blocks is presented.The algorithm drastically reduces the encoding time as compared ...
متن کاملUse of Wavelets in Fractal Compression Algorithm for Enhanced Performance
Fractal coding suffered from low coding efficiency, difficulties to obtain high quality encoding of images, and blocking artifacts at low bit rates and exhaustive inherent coding time. Blocking artifacts can be avoided if fractal coding is performed in the wavelet domain. A new fast and efficient image coder is developed that applies the speed of the wavelet transform to the image quality of th...
متن کامل