Star map joint non-uniformity correction method and device and storage medium

Abstract

The invention discloses a star map joint non-uniformity correction method and device and a storage medium, and the method comprises the steps: receiving a plurality of calibration images which are collected under the condition of no stray light interference; calculating a correction parameter according to the plurality of calibration images; receiving a star map to be corrected; processing the correction star map according to the correction parameters to obtain a two-point correction star map; introducing a sobel edge detection operator, and constructing a sobel weight factor; substituting thesobel weight factor into the guided filtering model for improvement to obtain an improved guided filtering model; and performing guided filtering on the two-point correction star map according to theimproved guided filtering model, and completing non-uniformity correction to obtain a non-uniformity corrected star map. According to the method, the purpose of completing star map non-uniformity correction while protecting weak star point signals in daytime can be achieved, and the attitude measurement precision of the star sensor can be improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a method, device and storage medium for combined star map non-uniformity correction. Background technique [0002] The star sensor is an optical attitude sensor with the advantages of high precision, strong anti-interference, and no cumulative attitude error. It is one of the most accurate attitude measurement instruments at present and has been widely used in outer space. [0003] The all-time star sensor adopts the short-wave infrared detection scheme, which expands the application range of the star sensor to high-altitude balloons and other aircraft in the altitude range of 12km-50km in the adjacent space atmosphere, which meets the working requirements of the day and night and is the future star sensor direction of development. At the same time, how to overcome the difficulty of extracting weak star point signals in the daytime environment is also a research hotspot in curren...

AI Technical Summary

Problems solved by technology

[0005] At present, the short-wave infrared non-uniformity correction algorithms are mainly divided into two categories according to the calculation methods of the correction parameters: one is the reference-based non-uniformity correction method, which mainly includes the two-point temperature calibration method and the multi-point calibration method. Temperature calibration method, this type of method is simple and easy to implement but the correction accuracy is not high; one type is based on the scene (scene-based) non-uniformity correction method, mainly including correction methods based on statistical models, automatic image registration-based Adaptive correction methods and neural network-based correction methods, etc., but the computational complexity is generally high, not suitable for engineering implementation, and it is easy to miscorrect the star point

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