However, because of the complex facial structure, the diverse facial expression and the changing light intensity, face recognition is still being recognized as a challenging research.
但人脸图像中表情、姿态、光照度等内外在因素皆多变，使得该研究至今仍颇具挑战性。
However, because of the complex facial structure, the diverse facial expression and the changing light intensity, face recognition is still being recognized as a challenging research.
但人脸图像中表情、姿态、光照度等内外在因素皆多变，使得该研究至今仍颇具挑战性。
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