Then this quadrature is used to classifying the blocks in the encoding phase , resulting in a great reduction to number of domain blocks to search for , hence shortening the encoding time dramatically 在分形编码时,用该不变量来对图像块进行分类,极大地减少了编码时定义域块的搜索数目,达到了加速编码的目的。
Following is specific work : a novel algorithm for fractal video sequence coding based on the extended quadtree video partition with the circular prediction mapping and the noncontractive mapping is proposed 提出了在扩展的四叉树视频压缩的基础上,利用环形预测映射和帧间非压缩映射相结合的视频序列分形编码方法。
With the mean of range block , the compression ratio is improved , the coding time and reconstruction time are decreased . then we discuss the relations among range blocks covariance , contrast scaling s and mse 采用值域块均值作为分形编码的参数可加快分形编码的速度,提高压缩比和加快分形图像压缩解码的收敛速度。
Then the fractal dimension can be used to classifying the blocks in the encoding phase , resulting in a great reduction to number of domain blocks to search for , hence shortening the encoding time dramatically 在分形编码时,用这个维数值来对图像块进行分类,大大减少了编码时定义域块的搜索数目,达到了加速编码的目的。
The input object image is used as an initial image in a fractal extraction process . the fractal extraction process uses the fractal models of the objects stored in the database , and iterates the initial image for each fractal model 该方法以待识别的人脸图像为分形值域,通过对人脸数据库中的人脸图像进行分形编码,达到识别的目的。
Experiments show that the matching scheme in this paper is much more close to human perception , and this technology is very suitable to construct and manage huge image databases 实验表明,这种基于自适应分形编码的图像相似性判别方法和人的主观判断非常接近且计算简单,适合于大型多媒体图像数据厍的检索,是一个非常有前景的图像检索方法。
Then a deep research on fractal image processing is done from the following two parts . ( 1 ) based on the basic theory of data compression and the correlated standards , the fractal image compression is studied deeply from the defect of fractal coding ( 1 )在对数据压缩的基本理论及相关标准研究的基础上,从分形编码存在的缺点出发,本文提出了三种新的分形图象压缩方法。
The author begins with this facet of the algorithm which can reduce the number of the matching of bloks in the process of the search , and therefore designs an optimized fractal image compression algorithm which aims to decrease the complexity of the fractal encoding and reduce encoding time 摘要从减少搜索匹配块的数目入手,提出了一种旨在降低分形编码的复杂度,缩短编码时间的分武力像压缩的改进算法。
It is well known that too long encoding time is the main drawback of this technique , in fact , prevent fractal image compression from becoming a practical method for image compression , hence fast encoding has become a hot issue in fractal image compression 众所周知,编码时间长是这项技术的主要缺点,它已成为该方法走向高效能实用化的最主要障碍,因此分形编码加速方法已成为了近些年来分形压缩的一个研究热点。
In this technique , an image is usually represented by a contractive affine transformation , for which the reconstructed image is its fixed point and approximate to the original image . the fractal code of the image consists of the parameters of the contractive transformation 在分形编码中,一幅图像由一个使它近似不变的压缩仿射变换表示,重构图像是压缩变换的不动点,压缩仿射变换的参数组成原始图像的分形码。