An Image Processing Method for Calculating Light Wave Polarization Direction and Degree of Polarization

Abstract

The invention relates to an image processing method for calculating the polarization direction and the polarization degree of an optical wave. A strategy combining full-domain fast rough estimation and local-area correlation accurate calculation is adopted, the rapid and high-precision calculation of the polarization direction and the polarization degree is realized. On the basis that the first-order vector polarized light is analyzed to generate a polarization image with the intensity of wedge-shaped bright and dark distribution, the quantitative calculation of the polarization direction andthe polarization degree of the incident light waves is realized, the calculation result precision is high, the speed is high, the repeatability is good, and the requirement on the exposure quality ofthe polarization image is not high.

Description

technical field [0001] The invention relates to the technical field of polarization detection, and further relates to a method for realizing quantitative calculation of light wave polarization direction and polarization degree by using digital image processing technology. Background technique [0002] Polarization is an important attribute of electromagnetic waves. Accurate measurement of polarization direction and degree of polarization has important applications in the fields of sky polarized light navigation, polarimetry, optical dispersion analysis, polarization imaging, and fluorescence polarization immunoassay. Vector polarized light is a vortex beam with axial symmetry and the polarization direction changes continuously with space, using the first-order vector polarized light field (such as angularly polarized light, radially polarized light) to modulate linearly polarized light or partially polarized light , can form a polarized image with wedge-shaped bright and dar...

AI Technical Summary

Problems solved by technology

Another typical example is the Chinese invention patent (201510641478.7) "Method and System for Sky Polarization Pattern Detection Based on S-Wave Plate" published by Zhang Wenjing and others on December 30, 2015, which describes a method using s-wave plate and light field camera The method and system to realize sky polarization mode detection, and introduces the specific method of calculating sky polarization degree and polarization direction angle by using Radon transform, but the calculation efficiency of this method is not high, especially when the image size is large and the angle detection accuracy is high , the Radon transform is very time-consuming, and has high requirements on the exposure of the polarized image. A small amount of local overexposure or underexposure will cause large errors in the detection results. Practical Requirements for High Precision Polarization Detection

Images