It is based on the theory of optical holography. And it utilizes CCD device to record holograms and fulfills the numerical reconstruction of the object wavefront by computer. Digital holography has the characteristic of non-contact, non-breakage and high precision. 它是基于光学全息理论,以CCD成像器件作记录介质获取全息图,然后通过计算机用数字方法对数字化的全息图进行再现,它具有非接触性、非破坏性和高分辨率的特点。
Digital holography is based on the theory of optical holography, but it utilizes CCD array to record Fresnel holograms and fulfills the numerical reconstruction of the object wavefront by computer. 它基于光学全息理论,以CCD摄像机等电子成像器件作记录介质获取全息图,然后通过计算机用数字方法对数字化的全息图进行再现。
The method uses an ensemble of short-exposure images obtained simultaneously from multiple cameras to jointly estimate the object and the wavefront distribution on pupil. 该方法主要是利用多个图像采集装置同时采集的一对或者多对短曝光图像,对目标和光瞳上的波前相位分布进行估计。
The characteristics of a sub-aperture spot image formed by extended object in Shack-Hartmann wavefront sensor were analysed. 分析了扩展目标在Shack-Hartmann传感器中的成像特点。