混叠
插值(计算机图形学)
计算机科学
反向传播
光谱(功能分析)
克罗内克三角洲
全息术
算法
人工智能
光学
计算机视觉
滤波器(信号处理)
人工神经网络
物理
图像(数学)
量子力学
作者
Ying Guan,Ze Cui,Zihan Xu,Wenjing Zhou
标识
DOI:10.1016/j.optlaseng.2024.108037
摘要
The research proposes a new method to solve the spectrum aliasing and improve the resolution of off-axis digital holograms based on Kronecker interpolation and backpropagation algorithms. The method suppresses the direct current (DC) image and increase the low-frequency information with Kronecker interpolation of the hologram. The size of the Fresnel reconstructed image can be controlled with the reconstruction distance, and this feature is used to select the appropriate reconstruction distance for the Fresnel amplitude reconstruction of interpolated holograms to separate the real and imaginary images. To obtain the complete first-order spectral information for the object, the amplitude of the desired image is obtained with spatial domain filtering and then inverted. Finally, the amplitude and phase of the object are reconstructed according to the angular spectrum reconstruction algorithm. The results show that the method can solve the spectrum aliasing problem of the holograms and thus improve the resolution of off-axis holograms. In addition, the background noise of the reconstructed phase is reduced because the influence of the zero-order spectrum can be completely avoided.
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