facerecexplanation.m
上传用户:mayisishi
上传日期:2018-01-16
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- %FISHERFACES FOR FACE RECOGNITION
- %
- % We develop a face recognition algorithm which is insensitive to large variation in lighting direction and facial expression.
- % Taking a pattern classification approach, we consider each pixel in an image as a coordinate in a high-dimensional space. We take
- % advantage of the observation that the images of a particular face, under varying illumination but fixed pose, lie in a 3D linear
- % subspace of the high dimensional image space梚f the face is a Lambertian surface without shadowing. However, since faces are
- % not truly Lambertian surfaces and do indeed produce self-shadowing, images will deviate from this linear subspace. Rather than
- % explicitly modeling this deviation, we linearly project the image into a subspace in a manner which discounts those regions of the
- % face with large deviation. Our projection method is based on Fisher抯 Linear Discriminant and produces well separated classes in a
- % low-dimensional subspace, even under severe variation in lighting and facial expressions. The Eigenface technique, another method
- % based on linearly projecting the image space to a low dimensional subspace, has similar computational requirements. Yet, extensive
- % experimental results demonstrate that the proposed 揊isherface