中国激光, 2018, 45 (5): 0509001, 网络出版: 2018-05-02
计算全息再现像放缩技术 下载: 955次
Zoom Technology of Reconstructed Images of Computer Generated Holograms
全息术 再现像 图像放缩 迭代算法 计算全息 holography reconstructed image image zooming iterative algorithm computer-generated hologram
摘要
在物体原始计算全息图基础上, 基于Gerchberg-Saxton迭代算法, 给出了一种全息图的再现像放缩算法。该算法利用物像关系原理, 通过设定恰当的参数, 在指定再现位置处实现再现像任意比例的放缩, 能有效避免放大比例过大导致的照明不均匀等问题。在MATLAB平台进行数值模拟, 搭建基于硅基液晶纯相位空间光调制器的全息再现光路对算法进行验证, 在特定衍射位置处得到一张二值化图片在缩放比例分别取0.5、2和3时的再现像。对一张灰度图像放大再现, 分析该算法对再现像成像效果的影响。实验结果证明, 算法实现了预期的再现像放大缩小, 并且有效地提升了再现像的成像质量。
Abstract
Based on the original computer-generated hologram (CGH) of an object, a zooming algorithm of the reconstructed image of CGH is presented based on the Gerchberg-Saxton iterative algorithm. Based on the principle of object-image relationships and the setting of appropriate parameters, this algorithm achieves reproduction at any given zooming factor in the specified reproduction position, which can effectively avoid the problems such as uneven lighting caused by excessive enlargement zooming. Numerical simulation is operated on MATLAB platform a holographic reconstruction optical path based on liquid crystal on silicon spatial light modulator with pure phase is built to verify the algorithm. Reconstructed images of a binary picture with zoom factors of 0.5, 2 and 3 are obtained respectively at a specified diffraction position. A grayscale picture is enlarged to analyze the imaging effect of this algorithm. The experimental results show that the expected image zooming is obtained and the quality of reconstructed images is effectively improved.
韩哲, 亓岩, 王延伟, 颜博霞. 计算全息再现像放缩技术[J]. 中国激光, 2018, 45(5): 0509001. Han Zhe, Qi Yan, Wang Yanwei, Yan Boxia. Zoom Technology of Reconstructed Images of Computer Generated Holograms[J]. Chinese Journal of Lasers, 2018, 45(5): 0509001.