折反射全向成像系统去散焦模糊技术研究

The defocus blur problem of catadioptric omnidirectional imaging, which caused by aperture and mirror curvature, becomes more severely along with introducing high resolution sensors and large aperture. This project studies the defocus deblurring technology of catadioptric omnidirectional imaging system, for the purpose of obtaining high definition omnidirectional image. The study content contains：1) novel catadioptric imaging mode, which moves image plane or focused plane in a particular pattern during image integration, then the defocus blur kernel of omnidirectional image is spatially invariant. It's one of the key issues in globally defocus deblurring. 2) designing the corresponding assistant physical/electronic equipment of the catadioptric imaging system to control the position of image plane or focused plane, then the captured results can satisfy the theory analysis as optimally as possible. 3) using deconvolution algorithm,which is combined with the omnidirectional image prior for omnidirectional image defocus blur restoration, to obtain all sharp omnidirectional image. Characteristic and innovation include: we designed novel system equipment based on computational photography. While capturing images the system can compensate the lost information which is necessary for defocus deblurring using unique deconvolution algorithm. This is a method of combining structure improvement and software enhancement. The research result has an important meaning in improving catadioptric omnidirectional imaging quality and promoting applications in related fields.

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。本项目研究有效去除散焦模糊的折反射全向成像技术，目的是得到高清晰度的全向图。研究内容：1）研究新型系统成像方式。在一次曝光成像时间内使像平面做特定相对运动，通过累计曝光使全向图像散焦模糊核具有期望的空间不变性，这是全局去除散焦模糊的关键；2）设计对应辅助机械/电子装置。用于控制相机像平面或聚焦平面的位置，使其满足理论推导所需的运动方式；3）研究适应全向图特点先验知识的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。特点与创新是：基于计算摄影思想设计新型装置，在采集图像时弥补去散焦模糊所需的缺失信息，实施特定反卷积以去除折反射全向成像散焦模糊。这是一种成像结构改进和软件增强紧密结合的方法。成果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。

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。本项目研究有效去除散焦模糊的折反射全向成像技术，目的是得到高清晰度的全向图。研究内容：1）研究新型系统成像方式。在一次曝光成像时间内使像平面做特定相对运动，通过累计曝光使全向图像散焦模糊核具有期望的空间不变性，这是全局去除散焦模糊的关键；2）设计对应辅助机械/电子装置。用于控制相机像平面或聚焦平面的位置，使其满足理论推导所需的运动方式；3）研究适应全向图特点先验知识的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。特点与创新是：基于计算摄影思想设计新型装置，在采集图像时弥补去散焦模糊所需的缺失信息，实施特定反卷积以去除折反射全向成像散焦模糊。这是一种成像结构改进和软件增强紧密结合的方法。成果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。