Color constancy algorithms are typically evaluated with a statistical analysis of the recovery angular error and the reproduction angular error between the estimated and ground truth illuminants. Such analysis provides information about only the magnitude of the errors, and not about their chromatic properties. We propose an Angle-Retaining Chromaticity diagram (ARC) for the visual analysis of the estimated illuminants and the corresponding errors. We provide both quantitative and qualitative proof of the superiority of ARC in preserving angular distances compared to other chromaticity diagrams, making it possible to quantify the reproduction and recovery errors in terms of Euclidean distances on a plane. We present two case studies for the application of the ARC diagram in the visualization of the ground truth illuminants of color constancy datasets, and the visual analysis of error distributions of color constancy algorithms.

中文翻译：

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ARC：用于颜色恒定性误差分析的角度保持色度图

颜色恒定性算法通常通过对估计的和真实的光源之间的恢复角度误差和再现角度误差进行统计分析来评估。这种分析仅提供有关误差大小的信息，而不提供有关其色度特性的信息。我们提出了一个角度保持色度图（ARC），用于对估计的光源和相应的误差进行视觉分析。与其他色度图相比，我们在定量角度和定性方面都证明了ARC在保留角距离方面的优越性，从而有可能根据平面上的欧几里德距离来量化再现和恢复误差。