A cost-effective, compact, and portable optical system using multi-angle illumination for retrieval of the amplitude and phase of a sample is implemented in this paper. The system consists of a matrix of LED followed by a mask, a USAF resolution chart, and a detector in a column. The sample information is collected by the detector directly without any objective lens. The sample information is encoded by the mask at a sensor plane during the reconstruction process. To retrieve the sample information from captured raw images corresponding to each LED illumination, the backward propagation model is applied. Three types of masks are used: a phase mask having pixel values from 0 to ${{2}}\pi$, an amplitude mask, and a combination of a phase and an amplitude mask with random distribution. The applications of such type of technique are most common in biomedical engineering for infection diagnostic purposes. In the future, the commercial demand of such lensless microscope would be high due to its simplicity and fast image processing capacity.

中文翻译：

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使用振幅和相位掩模的无透镜片上LED阵列显微镜

本文实现了一种经济高效，紧凑且便携式的光学系统，该系统使用多角度照明来检索样本的幅度和相位。该系统由一个LED矩阵，一个掩模，一个USAF分辨率表和一列检测器组成。检测器直接收集样品信息，而无需任何物镜。在重建过程中，样本信息由遮罩在传感器平面上编码。为了从对应于每个LED照明的捕获原始图像中检索样本信息，应用了反向传播模型。使用三种类型的掩码：具有像素值从0到$ {{2}} \ pi $的相位掩码，幅度模板以及具有随机分布的相位和幅度模板的组合。这种类型的技术的应用最常见于生物医学工程中，用于感染诊断。将来，由于这种无透镜显微镜的简单性和快速的图像处理能力，其商业需求将很高。