波前编码超分辨成像技术

发布时间：2018-01-10 22:12

本文关键词：波前编码超分辨成像技术　出处：《红外与激光工程》2016年04期 　论文类型：期刊论文

【摘要】：波前编码作为一种经典的计算成像技术,以能够大幅度拓展光学成像系统的焦深而闻名,并得到了学术界及工业界长期的关注。实际上,除了焦深的拓展,波前编码还具备实现超分辨率成像的潜力,而这在已有的研究中鲜有讨论。一方面,相位掩膜板的引入在降低光学系统传递函数并使其对离焦不敏感的同时,也有效降低了欠采样数字成像系统中的混叠效应,从而提供了更适合于进行超分辨率重构的数据源。另一方面,相位掩膜板所引起的点扩散函数支持域的巨大化效应使得以数字的方式、从采样间隔可以被认为是无限小的、理想的光学焦平面点扩散函数来计算与特定探测器物理像元大小相对应的采样点扩散函数成为可能。因此,从这两个特点出发,提出了一种为波前编码系统定制的、基于单帧图像放大的超分辨率重构算法,并且研制了原型样机对超分辨率的效果进行了检验。试验表明:焦距50 mm/F数4.5的Cooke三片系统除了焦深拓展超过20倍且具有接近衍射受限成像品质之外,利用复原算法能够实现至少3倍的高品质超分辨率重建效果。
[Abstract]:Wavefront encoding as a classical calculation of imaging technology, to expand substantially the focal depth of the optical imaging system is known, and has been in academia and industry long-term attention. In fact, in addition to expand the depth of focus, but also have to realize super resolution wavefront encoding imaging potential, which is rarely in the existing research in the discussion. On the one hand, the phase mask is introduced in the transfer function and makes it insensitive to defocus and reduce the optical system, but also effectively reduces the aliasing effect under sampling in digital imaging system, which can provide more suitable for super resolution reconstruction of the data source. On the other hand, phase mask the membrane plate caused by the point spread function of the huge effect of the support domain makes the digital way from the sampling interval can be considered to be infinitely small, the ideal optical focal point spread function is calculated with the specific detector physics like The size of the sample point spread function possible. Therefore, based on these two characteristics, proposed a system for wavefront encoding customization, super-resolution reconstruction algorithm based on single frame amplification, and developed a prototype to test the super resolution effect. Experiments show that the focal length of 50 mm/F number 4.5 of the Cooke three system in addition to expand more than 20 times the depth of focus and has near diffraction limited imaging quality, the restoration algorithm can achieve at least 3 times of high quality super resolution reconstruction.

【作者单位】：中国科学院西安光学精密机械研究所空间光学应用研究室;西安电子科技大学计算机科学与技术学院;
【基金】：国家自然科学基金(61107008,61203372,61105017)
【分类号】：TP391.41
【正文快照】： 0引言波前编码是一种能够有效拓展光学成像系统景深的计算成像技术。自1995年由美国科罗拉多大学的Cathey和Dowski提出以来就受到了学术界及工业界的广泛关注[1]。通过在成像系统的孔径平面上添加一块经过特殊设计的相位掩膜板,如经典的三次方型相位板[1],对数型及改进的对数

【相似文献】