Method for correcting non-uniformity fingerprint pattern on basis of infrared focal plane

Abstract

The invention provides a method for correcting a non-uniformity fingerprint pattern on the basis of the infrared focal plane, belonging to the technical field of infrared imaging and aiming to carry out the non-uniformity correction on the infrared images acquired by an uncooled infrared focal plane detector under the condition that no background frame is available. The method of the invention comprises the following steps: raw data acquisition, non-uniformity fingerprint extraction and correction treatment, wherein the non-uniformity fingerprint refers to that each infrared focal plane detector has relatively stable non-uniformity modes and temperature-dependent rules which go under the general name of non-uniformity fingerprint. By pre-estimating the non-uniformity modes and rules, the method is capable of carrying out the non-uniformity correction on the actual infrared images acquired by the infrared focal plane detector. Compared with the conventional method for correcting the non-uniformity of the infrared focal plane, the invention can effectively reduce the size of the detection device and dispense with the background frame acquired by using a uniform baffle at each time of correction according to the conventional method, thereby greatly simplifying the correction process.

Description

technical field [0001] The invention belongs to the technical field of infrared imaging, and in particular relates to a correction method based on a non-uniform fingerprint mode of an infrared focal plane detector. Background technique [0002] With the development of infrared detectors, infrared imaging systems have also been developed. In the first-generation infrared imaging system, a linear detector is used to scan and image through a one-dimensional optical machine. In the mid-1970s, the appearance of the IRFPA (Infrared Focal Plane Array, infrared focal plane array) detector marked the birth of the second-generation infrared imaging system—the staring infrared imaging system. Compared with linear detectors, focal plane detector imaging has the advantages of high spatial resolution, strong detection capability, and high frame rate, and is rapidly becoming the mainstream device of infrared imaging technology. At present, the staring infrared imaging system has begun to...

AI Technical Summary

Problems solved by technology

[0009] Analyze the two types of non-uniformity correction methods in the past. Calibration-based correction methods, such as the two-point method, due to the response drift of IRFPA, the actual correction needs to use a uniform reference source as a baffle to periodically collect surface source blackbody images as a background The frame is used for calibration, otherwise there will be a large residual error after correction; the adaptive correction method based on the scene class, such as the neural network correction method, requires a large amount of calculation when applied, which is not conducive to the real-time processing of the system, and often still after correction. Problems such as target degradation and artifacts can occur

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