CAJ | 학술논문

提出一种新的图像质量评价方法，将Shearlet变换捕捉视觉感知特征的能力和人类视觉系统的感知特性相结合来描述各种失真引起的图像质量的变化。该评价方法首先对参考图像和失真图像进行Shearlet分解，再对分解得到的不同尺度下的子带系数进行对比敏感度掩膜。然后根据由参考图像子带系数确定的感知阈值来计算参考图像和失真图像的各个子带中可感知到的系数所占的比例。最后通过比较失真图像相对于参考图像可感知到的系数所占比例的变化程度，综合得到图像质量的客观评价。分别在LIVE数据库和不同失真程度的图像集上对本研究算法进行有效性和合理性实验。实验表明本研究所获得的客观质量评价结果与人类的主观质量评价具有较高的一致性，能够很好地反映人类的主观感受。
제출일충신적도상질량평개방법，장Shearlet변환포착시각감지특정적능력화인류시각계통적감지특성상결합래묘술각충실진인기적도상질량적변화。해평개방법수선대삼고도상화실진도상진행Shearlet분해，재대분해득도적불동척도하적자대계수진행대비민감도엄막。연후근거유삼고도상자대계수학정적감지역치래계산삼고도상화실진도상적각개자대중가감지도적계수소점적비례。최후통과비교실진도상상대우삼고도상가감지도적계수소점비례적변화정도，종합득도도상질량적객관평개。분별재LIVE수거고화불동실진정도적도상집상대본연구산법진행유효성화합이성실험。실험표명본연구소획득적객관질량평개결과여인류적주관질량평개구유교고적일치성，능구흔호지반영인류적주관감수。
An objective image quality assessment metric was proposed by combing the ability of shearlet transform to capture the visual perception feature and the properties of human visual system to describe the degradation of image qual-ity.First,the shearlet transformation was applied to reference and distorted images to obtain the subband coefficients of different scales,and then the contrast sensitivity masking was employed to obtain the subband coefficients of different scales of same perceptual importance.Second,the proportion of perceived coefficients of reference and distorted images was calculated according to the perception threshold,which was obtained from the subband coefficients of reference im-age.Finally,the objective image quality assessment was acquired by comparing the differences of the proportion of per-ceived coefficients between reference and distorted images.Tests were done on LIVE database and image sets of distor-tion at different levels to verify the rationality and validity of the proposed method.Experimental results illustrated that the proposed method had a good consistency with the subjective assessment of human beings,thus could be used to de-scribe the visual perception of the image effectively.