WANG Jing, SU Guang-da. Illumination Compensation Based on Direction Filter and Self Quotient Image[J]. Acta Photonica Sinica, 2010, 39(9): 1641
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A new method is proposed to process facial image in bad lighting condition instantly.Based on simplified 3-D face illumination model,direction filter is used to weaken the attached shadow,and gaussian low pass filter is used to weaken the casted shadow.Image quality is greatly improved by the non-linear combination of the two methods.Experiment results demonstrate that the robust face recognition rate can be improved effectively by the proposed method under bad lighting conditions.