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.
对三维图形计算机显示的基本原理进行了讨论，详细介绍了坐标系变换、投影变换和明暗处理及光照模型的基本原理。
Then, the basic principles of drawing 3d graph by computer are discussed, particularly explained the fundamental theory of coordinate transform, projection transform and light model.
在明暗处理模型中考虑了物体对光的反射、透射、折射和阴影效应。
In shading model, the reflective, transparent, refractive and shadow effects are considered.
在明暗处理模型中考虑了物体对光的反射、透射、折射和阴影效应。
In shading model, the reflective, transparent, refractive and shadow effects are considered.
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