计算机与现代化
計算機與現代化
계산궤여현대화
COMPUTER AND MODERNIZATION
2015年
8期
112-115
,共4页
图像质量评价%相位一致性%评价函数%小波变换%主客观一致性
圖像質量評價%相位一緻性%評價函數%小波變換%主客觀一緻性
도상질량평개%상위일치성%평개함수%소파변환%주객관일치성
image quality assessment%phase congruency%assessment function%wavelet transform%consistency of subjective and objective
基于像素值的图像质量评价算法忽视了图像自身的结构特征信息，不能较好地评测某些失真类型的图像质量。针对这一问题，本文提出一种基于相位特征的图像质量评价算法。该算法根据人眼对图像的理解主要建立于图像低层次结构这一特点上，给出一种图像质量评价函数的计算方法。首先将图像的相位一致性作为评价函数的第一个特征；然后将图像的小波变换模作为评价函数的第二个特征。最后基于这2个特征获取整体图像的质量评价测度。仿真实验验证了该算法的有效性，结果表明提出的图像质量评价算法和人类主观评价感受具有良好的一致性。
基于像素值的圖像質量評價算法忽視瞭圖像自身的結構特徵信息，不能較好地評測某些失真類型的圖像質量。針對這一問題，本文提齣一種基于相位特徵的圖像質量評價算法。該算法根據人眼對圖像的理解主要建立于圖像低層次結構這一特點上，給齣一種圖像質量評價函數的計算方法。首先將圖像的相位一緻性作為評價函數的第一箇特徵；然後將圖像的小波變換模作為評價函數的第二箇特徵。最後基于這2箇特徵穫取整體圖像的質量評價測度。倣真實驗驗證瞭該算法的有效性，結果錶明提齣的圖像質量評價算法和人類主觀評價感受具有良好的一緻性。
기우상소치적도상질량평개산법홀시료도상자신적결구특정신식，불능교호지평측모사실진류형적도상질량。침대저일문제，본문제출일충기우상위특정적도상질량평개산법。해산법근거인안대도상적리해주요건립우도상저층차결구저일특점상，급출일충도상질량평개함수적계산방법。수선장도상적상위일치성작위평개함수적제일개특정；연후장도상적소파변환모작위평개함수적제이개특정。최후기우저2개특정획취정체도상적질량평개측도。방진실험험증료해산법적유효성，결과표명제출적도상질량평개산법화인류주관평개감수구유량호적일치성。
For the pixel-based method for image quality assessment ignores the structural features of natural images, which fails to measure some particular distortion types.Therefore, an image quality assessment algorithm by using phase feature is proposed. This method is proposed based on the fact that human eye understands an image mainly according to its low-level features.First, the phase congruency is considered as the primary feature in computing the assessment function.Then, the modulus of wavelet transform is considered as the second feature in computing the assessment function.Finally, the whole image quality assessment value can be obtained based on these two features.Experimental results on standard image database demonstrate that the effective-ness of the proposed method.Meanwhile, it has a good consistency with the subjective assessment of human beings.
