Terahertz image and visible light image mapping fusion method and system

Abstract

The invention provides a terahertz image and visible light image mapping fusion method and system. The method comprises the following steps: obtaining a visible light image and a first terahertz imageof a target; obtaining the distance from the target to the security check instrument; selecting a unimapping matrix closest to the target from preset unimapping matrix groups with different distances; mapping the first terahertz image through the selected unimapping matrix to obtain a second terahertz image; finding a target contour in the second terahertz image, and generating a mask image; andsuperposing the second terahertz image and the mask image on the visible light image to complete fusion. The terahertz image and the visible light image are fused through the uni-image matrix, so thatthe hidden object inspection sensory degree of security inspection personnel can be improved, the position of a suspicious contraband can be accurately positioned, and the security inspection efficiency is improved. Meanwhile, compared with a complex algorithm in the prior art, the method is simple and efficient, and the real-time performance of an original system is not affected.

Description

technical field [0001] The present invention relates to terahertz imaging technology, in particular to a method and system for mapping and fusion of terahertz images and visible light images. Background technique [0002] Millimeter wave / terahertz security inspection technology is a new type of human body security inspection technology that has emerged in recent years. This technology can use millimeter wave / terahertz waves to conduct non-contact security inspections on the human body. However, due to the imaging characteristics of terahertz images, the appearance features of the subject are seriously lost. Although visible light images are not easy to detect hidden objects, they contain rich appearance features. If the hidden object information of terahertz images is fused with the appearance information of visible light images, it will make the applicability of terahertz security inspection devices stronger. However, most of the existing millimeter-wave / terahertz security...

AI Technical Summary

Problems solved by technology

However, most of the existing millimeter-wave / terahertz security inspection equipment display visible light images and terahertz images independently without information fusion, which reduces the sensory experience of security inspectors for hidden objects inspection to a certain extent.

[0003] In addition, because the installation position and field of view angle of the terahertz security detector and the camera are inconsistent, the size, proportion and image content of the images obtained by the two are not completely consistent, so it is necessary to correct them to make them as similar as possible

In the prior art, there are methods for space-time mapping using algorithms, but they are relatively complex and computationally intensive, resulting in delays in detection

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