基于DMD空间光调制器解决分层全息成像混叠的研究

Research on Solving Layered Holographic Imaging Aliasing Based on DMD Spatial Light Modulator

层析法作为实现三维全息成像的主要方法之一,有着成像计算速度快、效果好的优点,但是传统层析计算得到的像会存在还原像层与层之间混叠的问题,影响成像的质量。为解决使用层析法进行三维全息成像时导致的层间像混叠和串扰的问题,提出了一种优化方法,基于DMD空间光调制器独特的微镜反射结构,使用球面波为核心模拟全方向均匀衍射,通过计算原始图像分层衍射后的亚振幅全息图,再使用3D-GS算法作为图像质量的优化方法,并对优化结果进行分析,通过仿真实验进行了验证。结果表明提出的方法很好地解决了层析法计算全息三维重建像时层间混叠和串扰的问题,同时,相比于传统分层全息计算,这种方法在短距离衍射成像时具有更大的成像尺寸,并且成像质量有了明显提高。

As one of the main methods for realizing 3D holographic imaging,tomography has the advantages of fast imaging calculation speed and good imaging quality.However,the image obtained by traditional tomographic calculation has the problem of overlapping between restored image layers,which affects the quality of imaging.To solve this problem,an optimization method was proposed.The method was based on the unique micro-mirror reflection structure of the DMD spatial light modulator.The spherical wave was the core to simulate the omnidirectional uniform diffraction.By calculating the sub-amplitude hologram after the layered diffraction of the original image,the 3D-GS algorithm was used as the optimization method of the image quality,and the optimization results were analyzed and verified by simulation experiments.The results show that this method can well solve the problems of inter-layer aliasing and crosstalk in 3D reconstruction images computed by tomography.At the same time,compared with the traditional layered holography calculation,this method has better performance in shortdistance diffraction imaging,and imaging quality has been significantly improved.