Guo Cheng-Shan, Han Yu-Jing, Xu Jian-Bo, Ding Jianping
Department of Physics, Shandong Normal University, Jinan, China.
Opt Lett. 2006 May 15;31(10):1394-6. doi: 10.1364/ol.31.001394.
We analyze the point spread function (PSF) of the image processing system for radial Hilbert transform and propose a novel spiral phase filter, called the Laguerre-Gaussian spatial filter (LGSF). Theoretical analysis and real experiments show that the LGSF possesses some advantages in comparison with the conventional spiral phase plate (SPP). For example, the PSF of the imaging system with a LGSF presents smaller suboscillations than that with the conventional SPP, which allows us to realize a radial Hilbert transform for achieving a high contrast edge enhancement with high resolution.
我们分析了用于径向希尔伯特变换的图像处理系统的点扩散函数（PSF），并提出了一种新型的螺旋相位滤波器，称为拉盖尔 - 高斯空间滤波器（LGSF）。理论分析和实际实验表明，与传统的螺旋相位板（SPP）相比，LGSF具有一些优势。例如，具有LGSF的成像系统的PSF呈现出比传统SPP更小的子振荡，这使我们能够实现径向希尔伯特变换，以实现高分辨率的高对比度边缘增强。
