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4 February 2013 Glare and shadow reduction for desktop digital camera capture systems
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The quality of images of objects with significant 3D structure, captured at close range under a flash, may be substantially degraded by glare and shadow regions. In this paper, we introduce an imaging system and corresponding algorithm to address this situation. The imaging system captures three frames of the stationary scene using a single camera in a fixed position, but an illumination source in three different positions, one for each frame. The algorithm includes two processes: shadow detection and image fusion. Through shadow detection, we can locate the area of shadows. After getting the shadow maps, we generate a more complete final image by image fusion. Our experimental results show that in most cases, the shadow and glare are markedly reduced.
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Thanh H. Ha, Chyuan-Tyng Wu, Peter Majewicz, Kurt R. Bengtson, and Jan P. Allebach "Glare and shadow reduction for desktop digital camera capture systems", Proc. SPIE 8652, Color Imaging XVIII: Displaying, Processing, Hardcopy, and Applications, 865206 (4 February 2013);

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