CAJ | 학술논문

为了去除数字全息零级像,提出了用离散全息图的微分强度替代全息图本身用于数字重建的新方法.该方法基于数字图像处理技术,通过对离轴数字全息图的空间频谱分析,首先理论上证明数字全息图的强度经过微分后再重建,可有效去除零级像;然后将实验采集到的全息图在程序中先微分再重建.理论分析和数字重建结果都表明,该方法可以有效地去除数字全息零级像在重建图像中心产生的大亮斑,从而显著提高重建图像的质量,使得重建像具有良好的对比度,且不需要其他辅助设备或多次全息记录,实验操作简单,方便快捷.
위료거제수자전식령급상,제출료용리산전식도적미분강도체대전식도본신용우수자중건적신방법.해방법기우수자도상처리기술,통과대리축수자전식도적공간빈보분석,수선이론상증명수자전식도적강도경과미분후재중건,가유효거제령급상;연후장실험채집도적전식도재정서중선미분재중건.이론분석화수자중건결과도표명,해방법가이유효지거제수자전식령급상재중건도상중심산생적대량반,종이현저제고중건도상적질량,사득중건상구유량호적대비도,차불수요기타보조설비혹다차전식기록,실험조작간단,방편쾌첩.
For eliminating the zero-order image in digital holography,a new method using the differential of the hologram intensity instead of the hologram itself for numerical reconstruction is proposed.This metllOd is based on digital image processing.By analyzing the spatial spectrum of the off-axis digital hologram,it theoretically proves that the zero-order image can be effectively eliminated bv differential before reconstruction.Then,the detected hologram is processed in the program with differential and reconstruction.Both the theoretical analysis and digital reconstruction results show that it can effectively eliminate the large bright spot in the center of the reconstructed image caused by the zero-order image,improve the image quality significantly,and render a better contrast of the reconstructed image.This method is very simple and convenient due to no superfluous optical elements and requiring only one time record.