Imaging Components, Systems, and Processing

Refocusing images and videos with a conventional compact camera

[+] Author Affiliations
Lai Kang

National University of Defense Technology, Science and Technology on Information Systems Engineering Laboratory, No. 47 Yanwachi Street, Kaifu District, Changsha 410073, China

Lingda Wu

National University of Defense Technology, College of Information System and Management, No. 47 Yanwachi Street, Kaifu District, Changsha 410073, China

The Academy of Equipment Command and Technology, National Laboratory of Electronic Information Equipment System, No. 14 Huairoubei Street, Huairou District, Beijing 101416, China

Yingmei Wei, Hanchen Song, Zheng Yang

National University of Defense Technology, College of Information System and Management, No. 47 Yanwachi Street, Kaifu District, Changsha 410073, China

Opt. Eng. 54(3), 033104 (Mar 12, 2015). doi:10.1117/1.OE.54.3.033104
History: Received December 13, 2014; Accepted February 23, 2015
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Abstract.  Digital refocusing is an interesting and useful tool for generating dynamic depth-of-field (DOF) effects in many types of photography such as portraits and creative photography. Since most existing digital refocusing methods rely on four-dimensional light field captured by special precisely manufactured devices or a sequence of images captured by a single camera, existing systems are either expensive for wide practical use or incapable of handling dynamic scenes. We present a low-cost approach for refocusing high-resolution (up to 8 mega pixels) images and videos based on a single shot using an easy to build camera-mirror stereo system. Our proposed method consists of four main steps, namely system calibration, image rectification, disparity estimation, and refocusing rendering. The effectiveness of our proposed method has been evaluated extensively using both static and dynamic scenes with various depth ranges. Promising experimental results demonstrate that our method is able to simulate various controllable realistic DOF effects. To the best of our knowledge, our method is the first that allows one to refocus high-resolution images and videos of dynamic scenes captured by a conventional compact camera.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Lai Kang ; Lingda Wu ; Yingmei Wei ; Hanchen Song and Zheng Yang
"Refocusing images and videos with a conventional compact camera", Opt. Eng. 54(3), 033104 (Mar 12, 2015). ; http://dx.doi.org/10.1117/1.OE.54.3.033104


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