Recovery of a chromaticity image free from shadows via illumination invariance
Recovery of a chromaticity image free from shadows via illumination invariance
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发表时间：
2003-10
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通讯作者：
G. Finlayson;S. D. Hordley
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作者：
G. Finlayson;S. D. Hordley
最近的一种方法，用于恢复灰度图像，没有阴影的影响被扩展，使恢复的图像是一个彩色图像，在某种意义上，二维色度信息被恢复。首先，通过将2D色带比色度的对数投影到与光照变化无关的方向上，可以消除光照变化的影响，从而在很大程度上消除阴影。由此产生的2向量颜色不包含输入图像中原始照明的贡献，因此通过考虑明亮像素的色度来恢复。通过将色度回归到原始图像上，对得到的图像进行了改进，取得了令人满意的结果。
A recent method for recovering a greyscale image that is free from shadow effects is extended such that the recovered image is a colour image, in the sense that 2-dimensional chromaticity information is recovered. First, the effect of lighting change, and thus to a large degree shadowing, is removed by projecting logarithms of 2D colour band-ratio chromaticities into a direction that is independent of lighting change. The resulting 2-vector colour does not contain the contribution of the original lighting in the input image, so this is restored by considering the chromaticity for bright pixels. The resulting image is improved by regression of the chromaticity onto the original image, with promising results.