High-contrast anisotropic edge enhancement free of shadow effect.
High-contrast anisotropic edge enhancement free of shadow effect.
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DOI：
10.1364/ao.58.00g351
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发表时间：
2019-12
期刊：
影响因子：
1.9
通讯作者：
Zhongzheng Gu;Da Yin;Shou-Ping Nie;Shaotong Feng;Fangjian Xing;Jun Ma;Caojin Yuan
中科院分区：
文献类型：
--
作者：
Zhongzheng Gu;Da Yin;Shou-Ping Nie;Shaotong Feng;Fangjian Xing;Jun Ma;Caojin Yuan
我们提出了一种类似贝塞尔的复合涡旋滤波器，以执行高对比度和功率控制的各向异性边缘增强与阴影效应的自由和低背景噪声。背景噪声，这是常见的，并强烈地降低在以前的各向异性涡旋滤波器的滤波后的图像质量，有效地减少通过抑制系统点扩散函数的旁瓣，从而增加图像的边缘对比度为0.98。通过保持滤波过程的径向对称性，完全消除了阴影效应，使边缘更加清晰，提高了图像分辨率。通过在两个相对的涡旋滤波器分量之间引入加权因子，边缘增强的功率变得可控。数值模拟和实验结果表明，该滤波器实现了更高的对比度的边缘增强的相位对比度和幅度对比度的目标。
We propose a Bessel-like composite vortex filter to perform high-contrast and power-controlled anisotropic edge enhancement with shadow-effect-free and low background noise. The background noise, which is commonly found and strongly decreases the filtered image quality in previous anisotropic vortex filters, is effectively reduced by suppressing the side lobes of the system point spread function, thereby increasing the image edge contrast to 0.98. The shadow effect is totally eliminated by keeping the radial symmetry of the filtering process, which makes edges sharper and improves image resolution. By introducing a weighting factor between two opposite vortex filter components, the power of edge enhancement becomes controllable. Numerical simulations and experimental results prove that the proposed filter achieves higher-contrast edge enhancement for both phase-contrast and amplitude-contrast objects.