Research on distortion invariant recognition based on lensless coaxial integrated micro-optic correlator

Abstract

In order to improve the recognition performance of the optical correlator for the distortion target, this article makes a complete theoretical analysis of the structure of the lensless integrated micro-optic correlator. Based on this theory, a simulation system for the distortion target of the correlator is established. At the same time, based on the system, an optimal trade-off synthetic discrimination function filter suitable for different distortions situations of the target to be identified was designed. The filter was loaded into the experimental light path of the correlator to verify the recognition effect of correlator on the distortion target. Simulation and experimental results illustrate that our lensless coaxial integrated micro-optical correlator can accurately recognize the targets with rotation distortion in the range of −50° to 50°and scaling distortion in the range of 58%–164%, which has a good distortion invariant recognition performance.

Terahertz Wideband Filter Based on Sub-Wavelength Binary Simple Periodic Structure

“…Based on the research on sub-wavelength optical design and application accumulated by our research group [10][11][12][13][14][15][16][17][18][19], this paper proposes a method based on a simple periodic binary sub-wavelength structure [12,13] to design a terahertz broadband filter. A silicon-based terahertz wideband filter with a center frequency of 4.07 THz was designed.…”