Abstract
The hand vein image tends to be of low contrast,which affects the recognition accuracy of the whole hand vein recognition system.The effective area of the hand vein image was extracted firstly and then the Histogram Equalization(HE) algorithm and its improved versions were employed to enhance the contrast of the extracted hand vein image.The results indicate that the Partially Overlapped Sub-block Histogram Equalization(POSHE) can enhance not only the overall contrast but also the detailed one.Meanwhile,its high efficiency is suitable to the hand vein image contrast enhancement.
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