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| This paper estimates the surface normal of a multi-colored object under multi-spectral lighting. This is a difficult problem since the albedo is different for each pixel and each channel. We solve this problem by sampling some pixels randomly. If we randomly sample neighboring pixels, the probability of picking the same albedo pixels may be high. Therefore, if the sampled pixels all have the same albedo, we can determine the surface normal uniquely. To demonstrate the effectiveness of this study, a measurement device with seven colors is used. |