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

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。

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 sceners 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.