Experimental study about improving the quality of in-focus image by means of optical scanning holography
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摘要: 为了改善光学扫描全息系统聚焦层重建图像的效果，采用随机相位光瞳替代传统针孔光瞳的方法，进行了理论的分析和实验验证，分别得到了传统光学扫描全息和基于随机相位编码的光学扫描全息系统下重建图像和原图像之间的信噪比、相关系数以及频谱分布比较结果。结果表明，在实验条件相同的情况下，基于随机相位编码的光学扫描全息系统重建的图像具有更高的信噪比和相关系数，且其图像频谱和原图像频谱曲线的变化趋势更相似，因而更接近于原图像。Abstract: In order to improve the quality of in-focus reconstructed images, random phase pupil was used to replace the pinhole in optical scanning holography system. After theoretical analysis and experimental verification, the comparison of signal to noise ratio, correlation coefficient and frequency spectrum distribution between the original and reconstructed images in the optical scanning holography system and the system based on random phase pupil was gotten respectively. The results show that under the same experimental condition, the reconstructed image from optical scanning holography based on random phase encoding has higher signal-to-noise ratio and correlation coefficient. The change trend of the reconstructed image spectrum is similar to that of the original image.
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Figure 7. Relationship between amplitude and frequency of the original image and the reconstructed image
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