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Evaluation and benchmarking of a pixel-shifting camera for superresolution lensless digital holography

机译：用于超分辨率无镜头数字全息的像素移位相机的评估和基准测试

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摘要

In lensless digital holography, the comparatively low resolution of the CCD devices that are used to record the digital holograms has to date limited both the maximum linear dimensions of the measurement object and also the minimum possible stand-off distance between the object and the CCD detector. A signal-processing-based technique known as superresolution (SR) image reconstruction can provide an alternative approach that reduces these restrictions. We report on an SR image reconstruction technique that has been introduced by employing a camera with a "microscanning" function to capture SR digital holograms via multiple subpixel movements of the CCD sensor. A detailed description of the approach is given, along with experimental results, which are discussed and evaluated, showing the advantages of using this method. An approach using three-dimensional holographic contouring is also described that may be adopted as a strategy for benchmarking newly developed algorithms at any stage of the lensless digital holographic process.
机译：在无透镜数字全息术中，迄今为止，用于记录数字全息图的CCD设备的分辨率相对较低，不仅限制了测量对象的最大线性尺寸，而且还限制了对象与CCD检测器之间的最小可能的距离。一种称为超分辨率（SR）图像重建的基于信号处理的技术可以提供减少这些限制的替代方法。我们报告了一种SR图像重建技术，该技术已通过采用具有“微扫描”功能的相机通过CCD传感器的多个子像素运动捕获SR数字全息图而引入。给出了对该方法的详细说明，并讨论和评估了实验结果，显示了使用此方法的优点。还描述了一种使用三维全息轮廓的方法，该方法可以用作在无透镜数字全息过程的任何阶段对新开发的算法进行基准测试的策略。

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