数字视频降分辨率算法的滤波器设计  

Design of filter for resolution reduction algorithm used in digital video

作　　者：袁莉[1] 初秀娟[1] 王志国[1] 

机构地区：[1]绥化学院,黑龙江绥化152061

出　　处：《现代电子技术》2015年第20期26-30,共5页Modern Electronics Technique

基　　金：黑龙江省教育厅科学技术研究项目(12543083)

摘　　要：数字视频在不通终端上应用时往往需要将分辨率降低到原始分辨率的1/2或1/4。因而需要有合适的算法改善降分辨率后图像的清晰度,满足用户对显示图像质量的要求。基于视频转码的需要,针对分辨率转换算法中最常用的滤波与子采样法,设计了一种用于滤波与子采样法的5阶数字滤波器,并在编译器上进行仿真验证与评估。仿真结果显示,新滤波器表现出优异的峰值信噪比,并且在分块算法中依然优异。总之,这里提出的方法不但复杂度适中,适应性强,而且能够高效、高质量地完成数字视频降分辨率。When the digital video is used in different terminals,the resolution is often reduced by a factor of 2 or 4,so a suitable algorithm is needed to improve the image sharpness after resolution reduction to meet user demands for image quality.In view of the need of video transcoding,a fifth-order digital filter used for filtering and sub-sampling method was designed,which was assessed and verified on interpreter. The simulation results show that the new filter has high PSNR（peak signal to noise ratio）,and is still excellent in the block algorithm. In short,the proposed method has moderate complexity and strong adaptability,and can achieve high efficiency and quality digital video resolution reduction.

关 键 词：视频转码 分辨率 滤波与子采样法 滤波器 

分 类 号：TN913-34[电子电信—通信与信息系统]