Overcoming the blooming effect on autofocus by fringe detection

Shao-Kang Huang; Dong-Chen Tsai; Homer H. Chen

doi:10.1117/12.2074816

27 February 2015 Overcoming the blooming effect on autofocus by fringe detection

Shao-Kang Huang, Dong-Chen Tsai, Homer H. Chen

Proceedings Volume 9404, Digital Photography XI; 94040M (2015) https://doi.org/10.1117/12.2074816
Event: SPIE/IS&T Electronic Imaging, 2015, San Francisco, California, United States

Abstract

In the presence of light bloom or glow, multiple peaks may appear in the focus profile and mislead the autofocus system of a digital camera to an incorrect in-focus decision. We present a novel method to overcome the blooming effect. The key idea behind the method is based on the observation that multiple peaks are generated due to the presence of false features in the captured image, which, in turn, are due to the presence of fringe (or feather) of light extending from the border of the bright image area. By detecting the fringe area and excluding it from focus measurement, the blooming effect can be reduced. Experimental results show that the proposed anti-blooming method can indeed improve the performance of an autofocus system.

Citation Download Citation

Shao-Kang Huang, Dong-Chen Tsai, and Homer H. Chen "Overcoming the blooming effect on autofocus by fringe detection", Proc. SPIE 9404, Digital Photography XI, 94040M (27 February 2015); https://doi.org/10.1117/12.2074816

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