Visual sensitivity to color errors in images of natural scenes
Visual sensitivity to color errors in images of natural scenes
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DOI：
10.1017/s0952523806233467
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发表时间：
2006-05-01
影响因子：
1.9
通讯作者：
Foster, David H.
中科院分区：
文献类型：
--
作者：
Aldaba, Mikel A.;Linhares, Joao M. M.;Foster, David H.
传统上，简单的色差公式和图片图像被用来估计由图像再现过程引入的颜色误差的视觉影响。但是RGB相机的有限色域限制了这种分析，特别是对自然场景的分析。这项工作的目的是估计视觉灵敏度的颜色误差故意引入到图片合成的高光谱图像的自然场景没有色域的限制，并比较歧视阈值表示在CIELAB和S-CIELAB颜色空间。从每个原始图像中，生成一组具有可变颜色误差的近似图像，并在校准的RGB彩色监视器上显示。在配对比较实验中确定了错误的可感知性阈值。与先前的研究一致，发现原始图像和近似图像之间的区分平均需要约2.2的CIELAB色差Δ E-ab（*）。尽管当误差以CIELAB单位表示时，发现测试的九个图像的性能变化很大，但当它们以S-CIELAB单位表示时，得到的变化很小。
Simple color-difference formulae and pictorial images have traditionally been used to estimate the visual impact of color errors introduced by image-reproduction processes. But the limited gamut of RGB cameras constrains such analyses, particularly of natural scenes. The purpose of this work was to estimate visual sensitivity to color errors introduced deliberately into pictures synthesized from hyperspectral images of natural scenes without gamut constraints and to compare discrimination thresholds expressed in CIELAB and S-CIELAB color spaces. From each original image, a set of approximate images with variable color errors were generated and displayed on a calibrated RGB color monitor. The threshold for perceptibility of the errors was determined in a paired-comparison experiment. In agreement with previous studies, it was found that discrimination between original and approximate images needed on average a CIELAB color difference Delta E-ab(*) of about 2.2. Although a large variation of performance across the nine images tested was found when errors were expressed in CIELAB units, little variation was obtained when they were expressed in S-CIELAB units.