选取HSV模型中与亮度无关的S通道作为棉花图像的特征，排除了图像明暗变化对分割效果的影响。
S channel of the HSV model is chosen as the feature of cotton images, which may get rid of the effect of light.
提出了一种基于混合反射模型的由明暗恢复形状的离散算法。
A discrete shape-from-shading (SFS) algorithm based on hybrid reflectance model is proposed.
相位一致性模型避免预先假设边缘的类型，且不受明暗对比度的影响。
Phase Congruency Model avoids the hypothesis of the edge type in advance, and is invariant by contrast.
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