Publication: Investigation of lighting and distance to camera for dorsal side of finger acquisition system
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Date
2024-07
Authors
Daniel , Wu Qi Hao
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Abstract
The dorsal side of finger image acquisition has emerged as a promising area of research with the advancement of biometric recognition systems. However, image
quality can be compromised by lower contrast and distortions from fixed camera positions. Moreover, the quality of biometric images is significantly influenced by
illumination conditions, which are crucial for accurate and reliable acquisition. This project addresses these issues by designing and evaluating a system using a Logitech C310 webcam, a lighting setup with brightness control, and a level lifting mechanism for camera movement. The study employs image quality assessment techniques to investigate the effects of different light intensities and camera heights on image quality. The optimal setup for the proposed device was determined to be at camera height of 12 cm with a 20% duty cycle for the highest perceived image quality (BRISQUE score of 62.55) and a height of 10 cm with a 100% duty cycle for the sharpest image (S3 score of 0.055). Increasing light intensity generally reduced image quality, with BRISQUE scores rising from 64.80 at 20% to 70.63 at 80%. Higher camera positions also decreased image quality, with BRISQUE scores increasing from 66.97 at 10 cm to 70.05 at 14 cm. On the other hand, image sharpness varied minimally across different light intensities and camera heights. The highest average S3 score, 0.051, was obtained at the 80% duty cycle, while ranging from 0.040 to 0.044 at other duty cycles. At the lowest camera height of 10 cm, images were sharpest, with an average S3 score of 0.047, decreasing slightly to 0.043 as height increased to 12 cm and 14 cm.