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首页> 外文会议>Novel optical systems design and optimization XI >Design of Mobile Phone Lens with Extended Depth of Field Based on Point-spread Function Focus Invariance
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Design of Mobile Phone Lens with Extended Depth of Field Based on Point-spread Function Focus Invariance

机译：基于点扩展函数焦点不变性的扩展景深手机镜头设计

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Due to the application of mobile phone lens, the clear image for the different object distance from infinity to close-up creates a new bargaining. We found that wave-front coding applied to extend the depth of field may solve this problem. By means of using cubic phase mask (CPM), the blurred point-spread function (PSF) is substantially invariant to defocus. Thus, the ideal hyperfocal distance condition can be satisfied as long as the constant blurred image can eventually be recovered by a simple digital signal processing. In this paper, we propose a different design method of computational imaging lens for mobile phone up to ideal depth of field based on PSF focus invariance. Because of the difficulty for comparing the similarity to different PSFs, we define a new metric, of correlation, to evaluate and optimize the PSF similarity. Besides, by means of adding the anti-symmetric free form phase plate at aperture stop and using the correlation and Strehl ratio as the two major optimization operands, we can get the optimum phase plate surface to achieve the required extended depth of field (EDoF). The resulted PSF on focal plane is significantly invariant to object distance varying from infinity to 10cm.
机译：由于移动电话镜头的应用，从无限远到特写的不同物距的清晰图像创造了新的讨价还价。我们发现，通过波前编码扩展景深可以解决此问题。通过使用三次相位掩模（CPM），模糊点扩展函数（PSF）对于散焦基本上是不变的。因此，只要最终可以通过简单的数字信号处理恢复恒定的模糊图像，就可以满足理想的超焦距条件。在本文中，我们提出了一种基于PSF聚焦不变性的至理想景深的手机计算成像镜头的不同设计方法。由于很难将相似性与不同的PSF进行比较，因此，我们定义了一种新的相关度量，以评估和优化PSF的相似性。此外，通过在孔径光阑处添加反对称自由形式相位板并使用相关性和斯特列尔比作为两个主要的优化操作数，我们可以获得最佳相位板表面以达到所需的扩展景深（EF） 。焦平面上产生的PSF对于从无穷远到10cm的物距明显不可变。

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