Terahertz image non-uniformity correction method

Abstract

The invention discloses a terahertz image non-uniformity correction method, and relates to the terahertz imaging technology field. Defects caused by incomplete response of a part of detection units during acquisition of terahertz image data are effectively overcome. A terahertz detector area array is divided into a plurality of areas to acquire a response gain parameter and an offset parameter, which are more accurate, and are used for two-point calibration algorithm pretreatment of a terahertz image of a target object, and then a final correction parameter can be used to reflect the response conditions of the various detection units of the detector area array accurately, and therefore better image effect can be acquired, and an image distortion problem caused by unreasonable weight allocation is overcome. The terahertz image non-uniformity correction method further comprises one-point calibration algorithm pretreatment used for updating the offset parameter, and therefore an object of real-time correction of response output of an imaging system is achieved. The temperature drift phenomenon of the terahertz array detector imaging system in a working state is overcome.

Description

technical field [0001] The invention relates to the technical field of terahertz imaging, in particular to a method for correcting non-uniformity of terahertz images. Background technique [0002] Terahertz imaging is a hot technology in current research. The main reason is that terahertz radiation has low photon energy and high penetration ability to non-metal and non-polar substances, making it able to penetrate clothes, plastics, ceramics, etc. Therefore, it shows great application prospects in non-destructive testing, medical inspection, safety testing, environmental monitoring and space remote sensing. [0003] Due to factors such as its manufacturing process, external environment, and optical imaging of the terahertz detector, the original image output by the detector will more or less have defects such as misalignment, response non-uniformity, and blind pixels. Therefore, the preprocessing of the original image is very necessary. [0004] The preprocessing of the or...

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Problems solved by technology

[0005] The size of the focal plane array and the response of each unit should be fully considered in the non-uniformity correction of the terahertz image. However, since the terahertz light source is a point source, the detector usually receives the terahertz radiation locally, and the local Terahertz radiation can affect the non-uniformity correction results of the entire terahertz detector

[0006] In order to overcome the above technical problems, there is an urgent need for a method that can obtain a more accurate output signal of the detection unit, and through this method, the problem of image distortion caused by unreasonable weight distribution can be solved, and a better terahertz imaging effect can be achieved.

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