Enhanced low-light auto-focus system model in digital still and cell-phone cameras

Authors:
Mark Gamadia;Nasser Kehtarnavaz
Affiliations:
Department of Electrical Engineering, University of Texas at Dallas, Richardson, TX;Department of Electrical Engineering, University of Texas at Dallas, Richardson, TX
Venue:
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Year:
2009

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Abstract

In low-light conditions, the focus value curve or sharpness function that is used in passive auto-focusing becomes flat due to the increase in the noise level. This paper presents an enhanced low-light auto-focusing system model which provides performance improvements over our previously introduced low-light autofocusing model. This is achieved by utilizing an indexed family of focus value curves via a digital band-pass filterbank. A new sharpness ratio metric is presented for evaluation of autofocusing in low-light conditions. Experimental results obtained from three different prototype camera platforms demonstrate the improved low-light performance over our previous model.