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After the face detection step, human-face patches are removed from images via feature extraction phase. If we use these patches for face recognition directly, it may have some limitations; first, each patch usually holds over 1000 pixels, which are too enormous to build a robust recognition. Second, face patches may be taken under different illumination, with different face expressions, and with different camera alignment, and may suffer from occlusion and cluttering background. To overcome these drawbacks, we perform feature extractions to do dimensionality reduction, information packing, salience extraction, and noise cleaning. After this step, we transformed face patch into a vector with fixed dimension or a set of fiducial points and their  corresponding locations. We can include feature extraction either in face detection or face recognition as per survey form some literatures.

Figure 5 After the face detection step, human-face patches are removed from images via feature extraction phase. If we use these patches for face recognition directly, it may have some limitations; first, each patch usually holds over 1000 pixels, which are too enormous to build a robust recognition. Second, face patches may be taken under different illumination, with different face expressions, and with different camera alignment, and may suffer from occlusion and cluttering background. To overcome these drawbacks, we perform feature extractions to do dimensionality reduction, information packing, salience extraction, and noise cleaning. After this step, we transformed face patch into a vector with fixed dimension or a set of fiducial points and their corresponding locations. We can include feature extraction either in face detection or face recognition as per survey form some literatures.