Visible light broadband spectrum image registration method

Abstract

The invention discloses a visible light broadband spectrum image registration method. The method includes the steps that graying, denoising and downsampling are carried out on a reference image and an image to be registered, feature points of the images are extracted by using an SIFT algorithm, and feature description operators are constructed; the feature points are matched according to a k-d tree nearest neighbor method, and coordinate upsampling is carried out on matched feature points; according to an image degradation threshold T, wrong matching points are restrained by means of an Euclidean distance, and restrained matching point sets omegan are obtained; m pair matching point space uniform sampling is conducted on the restrained matching point sets omegan to obtain matching point sets omegam uniformly distributed; image radiation conversion parameter matrixes Tm are solved by using the least square method, and coordinate conversion and bilinear interpolation calculation are conducted on the image to be registered through the Tm; mutual information MIm of the reference image and a registered image serves as an evaluation index, the registered image corresponding to maximum mutual information MImax is locked, and a visible light broadband spectrum image is registered. According to the method, the number of the wrong matching points can be greatly reduced and image registration precision can be improved.

Description

technical field [0001] The invention belongs to the technical field of high-fidelity digital image acquisition, and in particular relates to a registration method for visible light broadband spectrum images. Background technique [0002] Broadband spectral imaging technology is one of the mainstream technologies for high-fidelity digital image acquisition at home and abroad. The ultimate goal of this technology is to collect spectral reflectance information on the surface of an object. Usually, a high-resolution digital back and a broadband filter are used to form a broadband spectral imaging system. The filters are sequentially placed in the optical path of the digital back. The multi-channel images of the object are obtained by shooting and combining, and then the spectral reflectance of the object surface is calculated by the spectral reconstruction algorithm, so as to obtain the information of the spectral reflectance of the object surface. Among them, using a high-reso...

AI Technical Summary

Problems solved by technology

At present, in the field of broadband spectral imaging technology, although the existing image registration methods can eliminate the distortion problem between images to a certain extent, due to the lack of sufficient analysis and processing for the extraction of feature information, the actual calculation of image registration methods is difficult. The feature information of the parameters contains some wrong information, resulting in a certain degree of distortion between the images after registration

For the above problems, neither academia nor industry has proposed a method to solve the precise registration of visible light broadband spectral images from the perspective of image matching feature refinement processing

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