扩散滤波器及其在图象放大中的应用  

The Diffusion Filter and Its Application for Picture Enlargement

作　　者：侯正信[1] 胡泉[1] 

机构地区：[1]天津大学电子信息工程学院

出　　处：《信号处理》1998年第A12期71-75,共5页Journal of Signal Processing

摘　　要：图象放大在图象显示、视频特技等领域有广泛的应用。当既要求图象放大质量好又要求算法简单时，传统的图象放大方法遇到了困难，其原因是未考虑到视觉的方向敏感性。本文提出了一种与视觉特点相匹配的图象放大方法一邻域扩散法，以简单的坐标变换获得了较好的图象放大效果，特别有利于硬件实现。文中分析了一种新型的二维低通数字滤波器—扩散滤波器及其频率响应特性，构造了具体实现中的扩散增量矩阵，给出了任意（N／M）×（N／M）倍放大坐标变换关系。本文的结果和放大实例也可作为视觉方向特性的一个实验证明。Picture enlargement has widely been used in many fields, such as image display video effects etc..When a good enlargement quality and a simple algorithm are expected simultaneously, the traditional methods for picture enlargement will run into difficulty. Because the directional sensitivity of human vision is not been considered.In this pgner, the adjacent diffusion - a new method that matches human vision for picture enlargement is proposed. By means of a simple coordinate transposition, which especially benefits for hardware implementation, a fairly good picture enlargement effeCt can be obtained. In this paper, a new 2-dimensional low-pass filter-the diffusion filter and its frequency response are analyzed, the diffusion increment matrices for the actual application of the filter are constituted and the coordinate transposition relationship for an arbitrary (N/M)× (N/M) enlargement is gave. The results of this paper including some enlargement examples can also be regarded as experimental evidence on the directional characteristic of human vision.

关 键 词：领域扩散 扩散滤波器 图象放大 图象处理 计算机 

分 类 号：TN713[电子电信—电路与系统] TP391.41[自动化与计算机技术—计算机应用技术]