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CLC number: TP391

On-line Access: 2013-12-06

Received: 2013-04-03

Revision Accepted: 2013-08-01

Crosschecked: 2013-09-16

Cited: 1

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Journal of Zhejiang University SCIENCE C 2013 Vol.14 No.12 P.930-940

http://doi.org/10.1631/jzus.C1300080


An efficient projection defocus algorithm based on multi-scale convolution kernel templates


Author(s):  Bo Zhu, Li-jun Xie, Guang-hua Song, Yao Zheng

Affiliation(s):  School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zhubo@zju.edu.cn, zdxlj@zju.edu.cn

Key Words:  Projection focal, Sobel-Tenengrad evaluation function, Projector defocus, Multi-scale convolution kernels


Bo Zhu, Li-jun Xie, Guang-hua Song, Yao Zheng. An efficient projection defocus algorithm based on multi-scale convolution kernel templates[J]. Journal of Zhejiang University Science C, 2013, 14(12): 930-940.

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DOI - 10.1631/jzus.C1300080


Abstract: 
The focal problems of projection include out-of-focus projection images from the projector caused by incomplete mechanical focus and screen-door effects produced by projection pixilation. To eliminate these defects and enhance the imaging quality and clarity of projectors, a novel adaptive projection defocus algorithm is proposed based on multi-scale convolution kernel templates. This algorithm applies the improved Sobel-Tenengrad focus evaluation function to calculate the sharpness degree of intensity equalization and then constructs multi-scale defocus convolution kernels to remap and render the defocus projection image. The resulting projection defocus corrected images can eliminate out-of-focus effects and improve the sharpness of uncorrected images. Experiments show that the algorithm works quickly and robustly and that it not only effectively eliminates visual artifacts and can run on a self-designed smart projection system in real time but also significantly improves the resolution and clarity of the observer’s visual perception.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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