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去散焦模糊的折反射全向成像系统设计

Design of Catadioptric Omnidirectional Imaging System for Defocus Deblurring

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摘要

随着高分辨率传感器和大光圈的采用,光圈和反射面曲率造成的折反射全向成像散焦模糊问题越发突出。提出了一种有效去除散焦模糊的折反射全向成像系统设计。理论分析折反射成像散焦模糊的原因,建立全向图点扩展函数与实景空间物点及成像系统虚像位置的关系;在一次曝光成像时间内匀速旋转镜头对焦环,通过累积曝光使全向图散焦模糊核具有期望的空间不变性;利用反卷积算法对散焦模糊全向图进行复原,得到全局清晰的全向图像。该方法较好地解决了折反射全向成像散焦模糊问题,对提高折反射全向成像质量,促进其在相关领域的广泛应用具有重要意义。

Abstract

The defocus blur problem of catadioptric omnidirectional imaging, which is caused by aperture and mirror curvature, becomes more severe along with introducing high-resolution sensors and large aperture. One design of catadioptric omnidirectional imaging system for defocus deblurring is proposed. The defocus blur of catadioptric omnidirectional imaging is analyzed in theory, and the relation between point spread function of omnidirectional image and scene′s spatial points or the position of virtual features is established. Then, the defocus blur kernel of omnidirectional image is spatially invariant when image plane is moved in a particular pattern during image integration. A deconvolution algorithm is used for the defocus blur omnidirectional image restoration to obtain all sharp omnidirectional images. The method is effective for catadioptric omnidirectional image defocus deblurring, and has an important meaning in improving catadioptric omnidirectional imaging quality and promoting applications in related fields.

Newport宣传-MKS新实验室计划
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中图分类号:TN911

DOI:10.3788/aos201232.0911001

所属栏目:成像系统

责任编辑:李文喆  信息反馈

基金项目:国家自然科学基金(61175006,61175015,60803101,60872150)资助课题。

收稿日期:2012-03-07

修改稿日期:2012-04-12

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作者单位    点击查看

李永乐:国防科学技术大学信息系统与管理学院, 湖南 长沙 410073
张茂军:国防科学技术大学信息系统与管理学院, 湖南 长沙 410073
娄静涛:国防科学技术大学信息系统与管理学院, 湖南 长沙 410073
王炜:国防科学技术大学信息系统与管理学院, 湖南 长沙 410073

联系人作者:李永乐(liyongle1984@163.com)

备注:李永乐(1984—),男,博士研究生,主要从事折反射全向视觉、图像处理和多媒体与虚拟现实技术等方面的研究。

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