Improved B-spline non-rigid registration method for distortion correction of atmospheric turbulence image

Abstract

The invention discloses an improved B-spline non-rigid registration method for distortion correction of an atmospheric turbulence image, relates to the field of atmospheric optics, and mainly solves the problem that the correction performance is unstable when the atmospheric turbulence image is seriously distorted in a traditional registration method. The method comprises the following steps: inputting an image sequence degraded by atmospheric turbulence, taking an average frame of the image sequence as a reference image, and taking each frame in the image as a floating image; generating a uniform grid control point matrix; generating an image deformation field by adopting B-spline non-rigid transformation; the floating image is transformed according to the deformation field, and normalized square difference between the floating image and the reference image is carried out to serve as a target function of image registration similarity; solving an optimal control point matrix when the target function is minimum by using an adjustable exponential damping factor LM algorithm fused with a particle swarm algorithm; and obtaining a registered floating image according to the optimal control point matrix. When the method is used for processing multiple frames of distorted turbulence images, the stability is relatively good, and relatively good image correction quality can be obtained.

Description

technical field [0001] The invention belongs to the field of atmospheric optics, in particular to an improved B-spline non-rigid registration method for atmospheric turbulence image distortion correction. Background technique [0002] Atmospheric turbulence is an irregular random motion of the atmosphere. This random motion will cause random fluctuations in the atmospheric refractive index. Therefore, when light propagates in atmospheric turbulence, it will lead to atmospheric turbulence effects such as spot drift, beam expansion, and spot flickering. For the imaging detection of long-distance targets, this turbulent effect will directly lead to random geometric distortion of the image and variable temporal and spatial blurring, which will bring great interference to the detection of long-distance targets in the atmosphere. How to eliminate the influence of atmospheric turbulence has always been a problem. A difficult problem in the field of visible / infrared detection. [0...

AI Technical Summary

Problems solved by technology

However, when the traditional B-spline non-rigid image registration based on LM acceleration is applied to the geometric deformation correction of turbulent images, the correction performance is unstable when the image distortion is serious.

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