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@INPROCEEDINGS{Oyamada2008Acivs,
  author = {Yuji Oyamada and Hideo Saito},
  title = {Defocus Blur Correcting Projector-Camera System},
  booktitle = {Advanced Concepts for Intelligent Vision Systems (ACIVS)},
  year = {2008},
  pages = {453--464},
  abstract = {To use a projector anytime anywhere, a lot of projector-camera based
	approaches have been proposed. In this paper, we focus on a focal
	correction technique, one of projector-camera based approaches, reduces
	an effect of defocus blur which occurs when a screen is located out
	of projector's depth-of-field. We propose a novel method for estimating
	projector defocus blur on a planar screen without any special measuring
	images. To estimate a degree of defocus blur accurate, we extract
	sub-region which is well-suited for defocus blur estimation in a
	projection image and estimate the degree of defocus blur at each
	extracted region. To remove the degradation caused by the defocus
	blur, we pre-correct the projection image depends on the degree of
	defocus blur before projection. Experimental results show that our
	method can estimate the degree of defocus blur without projecting
	any special images and pre-corrected image can reduce the effect
	of the defocus blur.}
}