CAJ | 학술논문

提出了一种基于二进制小波变换和改进SPIHT算法的图像编码方法.二进制小波变换将图像从实数域变换到实数域,消除像素之间的空间冗余性,得到了具有整数准确度的紧致描述.针对传统SPIHT 算法解码图像视觉效果差的缺点,提出了改进方法.根据图像分析结果,将二进制小波变换变换系数按视觉重要性重新排序,通过对视觉重要系数优先编码,把量化误差集中在视觉不敏感区域,从而在不影响编码率失真性能的同时,有效地提高了解码图像的视觉效果.实验结果表明,和其它流行的编码算法相比,本文算法对不同性质的图像具有最优的编码性能和视觉效果.
제출료일충기우이진제소파변환화개진SPIHT산법적도상편마방법.이진제소파변환장도상종실수역변환도실수역,소제상소지간적공간용여성,득도료구유정수준학도적긴치묘술.침대전통SPIHT 산법해마도상시각효과차적결점,제출료개진방법.근거도상분석결과,장이진제소파변환변환계수안시각중요성중신배서,통과대시각중요계수우선편마,파양화오차집중재시각불민감구역,종이재불영향편마솔실진성능적동시,유효지제고료해마도상적시각효과.실험결과표명,화기타류행적편마산법상비,본문산법대불동성질적도상구유최우적편마성능화시각효과.
An image coding algorithm based on binary wavelet transform (BWT) and modified SPIHT was proposed.With the BWT,it eliminates spatial correlation and achieves compact representation of an image with integer precision,by mapping image pixels from real field to real field.Modified approach also presented to improve the poor visual quality of the traditional SPIHT algorithm.In our method,BWT coefficients are reordered according to their perceptual importance.The visually important coefficients are transmitted as early as possible,whereas those compression distortions are distributed in less visual significant regions.In this way,the visual qualities of decoded images are significantly improved without impairing the rate-distortion performance of the encoder.Experimental results show that the proposed algorithm achieves optimal compression performance and visual quality for images with various characteristics,as compared with other popular compression algorithms.