Non-uniform Correction System of Large Zoom Ratio Infrared Thermal Imager

Abstract

A non-uniform correction system for a thermal imager with a large zoom ratio, the thermal imager has a focal length with a large zoom ratio, each focal length corresponds to non-uniform correction data, and the non-uniform correction table of the detector of the thermal imager , stored in the cache memory of the image processor; the infrared thermal imager detector sends the grayscale data of the detection image to the central processing unit, and the central processing unit sends the grayscale data to the image processor; the image processing The processor includes a grayscale correction pipeline and a graphic element assembly unit for rendering images; the grayscale correction pipeline includes a dynamic switching unit driven by focal length change speed, a static calling unit for updating frame buffer data, and a correction calculation unit. The invention applies the non-uniform correction table of the infrared thermal imager to the image processor to realize real-time non-uniform correction and improve the imaging quality of the infrared thermal imager.

Description

technical field [0001] The invention relates to the technical field of image correction, and more specifically relates to a non-uniform correction system of a large zoom ratio infrared thermal imager. Background technique [0002] Many application scenarios require thermal imaging cameras to take into account the functions of long-distance target detection and large-field target search at the same time. Thermal imaging cameras with large zoom ratio optical systems are currently the most economical and common method to meet this demand. The design of the large zoom ratio optical system needs to consider the imaging quality of each focal length during the optical zoom process, but due to the size limitation of the optical system, cost, processing difficulty, and adjustment, it is usually impossible to guarantee the same performance for each focal length. One of the more obvious problems is that the degree of narcissus of each focal length is inconsistent, so the non-uniformity...

AI Technical Summary

Problems solved by technology

This method improves the non-uniformity of optical infrared thermal imaging cameras with large zoom ratios to a certain extent, but at the same time, this method brings about problems such as image edge detail quality degradation and residual "ghosting" in principle, and another On the one hand, when some focal length points or focal length segment narcissus are serious in the infrared thermal imager with large zoom ratio optical system, the non-uniformity caused by narcissus cannot be completely smoothed after the source image is low-pass filtered, which leads to the convergence of the correction method not good

Images