CAJ | 학술논문

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。
수자시빈재불통종단상응용시왕왕수요장분변솔강저도원시분변솔적1/2혹1/4。인이수요유합괄적산법개선강분변솔후도상적청석도，만족용호대현시도상질량적요구。기우시빈전마적수요，침대분변솔전환산법중최상용적려파여자채양법，설계료일충용우려파여자채양법적5계수자려파기，병재편역기상진행방진험증여평고。방진결과현시，신려파기표현출우이적봉치신조비，병차재분괴산법중의연우이。총지，저리제출적방법불단복잡도괄중，괄응성강，이차능구고효、고질량지완성수자시빈강분변솔。
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.