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Recognition of hand vein is becoming a research focus in biological recognition field, due to its particular advantage of uniqueness and livingness. The acquisition of clear vein image is an important premise for recognition. A quantitative assessment method of image quality is proposed based on two spatial indicators. It is shows that the relationship between the quantitative score of vein image...
Recognition of hand vein is becoming a research focus in biological recognition field, due to its particular advantage of uniqueness and livingness. In this study, images of hand vein were obtained by near-infrared camera with hand illuminated by near-infrared light source. The acquisition of clear vein image is an important premise for recognition. In the paper, we propose a quantitative evaluation...
To study a nonlinear compensation for human vision contrast resolution (HVCR) in the scotopic condition in order to improve it. If the different gray information, which is acquired in the scotopic condition and cannot be resolved by human vision, is placed at such a gray level distance as the just noticeable difference (JND), HVCR in the scotopic condition can be compensated nonlinearly. Through the...
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