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Quality versus Color Saturation and Noise

机译:质量与色彩饱和度和噪点

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A softcopy quality ruler study involving 12 scenes and 34 observers was performed to quantify the dependence of quality on color saturation, in the absence of noise, with saturation measured using Imatest software. It was found that quality falls off symmetrically with deviation of color saturation from the preferred value of about 110%, with a 20% change in saturation reducing quality by about two just noticeable differences (JNDs). Optimization of noise versus color saturation was investigated using (1) the aforementioned transform of color saturation to JNDs of quality; (2) a previously published objective metric and JND transform for isotropic noise; and (3) the multivariate formalism, for combining JNDs from independent attributes into an overall quality JNDs. As noise increases and signal to noise ratio (SNR) decreases, the optimal color saturation decreases from the 110% position, so that there is less noise amplification by the color correction matrix. A quality contour plot is presented, showing a region of plausible color saturation values, as a function of SNR, for a representative use case. One example of a reasonable strategy is to provide 80% color saturation at SNR = 5, 90% at SNR = 10,100% at SNR = 20, and 110% at SNR 50 and above.
机译:进行了软拷贝质量标尺研究,涉及12个场景和34个观察者,以量化质量在没有噪声的情况下对色彩饱和度的依赖性,其中饱和度使用Imatest软件测量。已经发现,质量会随着色彩饱和度偏离最佳值约110%而对称下降,饱和度变化20%会使质量降低约两个恰好明显的差异(JND)。使用以下方法研究了噪声对色彩饱和度的优化:(1)将色彩饱和度转换为质量JND的上述过程; (2)先前发布的用于各向同性噪声的目标度量和JND变换; (3)多元形式主义,用于将来自独立属性的JND合并为整体质量的JND。随着噪声的增加和信噪比(SNR)的降低,最佳色彩饱和度将从110%的位置开始降低,因此色彩校正矩阵对噪声的放大作用较小。给出了质量等高线图,其中示出了代表用例的合理的色彩饱和度值区域,作为SNR的函数。合理策略的一个示例是在SNR = 5时提供80%的色彩饱和度,在SNR = 20时在SNR = 10,100%时提供90%,在SNR 50及以上时提供110%。

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