Journal
OPTICS EXPRESS
Volume 24, Issue 22, Pages 25258-25268Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.24.025258
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Funding
- National Natural Science Foundation of China (NSFC) [61377003, 61575095]
- Key grant project of Jiangsu Provincial Department of Education, China [14KJA140001]
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The isotropic and anisotropic image edge enhancements by employing Airy spiral phase filters are proposed and demonstrated. The coherent spread functions of the image systems are derived from transmittance functions of their corresponding filters. In the isotropic method, the distributions of the coherent spread function with the radius of the main ring rho(0) and the scaled parameter w(0) are numerically analyzed. It is found that the width of the main lobe determining the resolution decreases with the increased rho(0), and the amplitudes of the side lobes connecting with the contrast fluctuate with w(0). Compared with the existing spiral phase filters, higher contrast and resolution can be achieved by adjusting the two parameters in the Airy spiral phase filter. Moreover, an off-axis Airy spiral phase filter by controlling the center position (rho(0),phi 1) is designed and employed to implement anisotropic edge enhancement. In the experiments, two methods of image edge enhancement have been verified by using the amplitude-contrast and phase-contrast objects. (C) 2016 Optical Society of America
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