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A method for image registration in high resolution images of the sun

A high-resolution image, high-resolution technology, applied in image analysis, image enhancement, image data processing, etc., can solve problems such as inaccurate registration accuracy, and achieve the effect of solving inaccurate

Active Publication Date: 2019-02-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention provides a registration method for high-resolution images of the sun and full-helioscopic images with rotation, scaling and translation transformation relations. The method is based on registration based on grayscale information, combined with cross-correlation method and Fourier -Mellin method, using coarse angle matching plus fine angle matching plus point matching method, accurately registers the sun image with scaling, rotation and translation transformation, and solves the registration accuracy of the traditional registration method in the process of registering the sun image imprecise question

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  • A method for image registration in high resolution images of the sun
  • A method for image registration in high resolution images of the sun
  • A method for image registration in high resolution images of the sun

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Embodiment 1

[0031] Embodiment 1: as Figure 1-10 As shown, a method for image registration in high-resolution images of the sun. First, preprocess the high-resolution images and full-helioscopic images respectively, and perform preprocessing operations on the images according to the initial estimated data, using block method, divide the full-sun image into blocks, and initially match the position of the high-resolution image in the full-sun image; secondly, use the maximum block direction angle method to calculate the direction angle difference to obtain the rough rotation angle; according to the obtained coarse rotation angle, the full-sun The surface image is roughly rotated on the basis of the image after the initial rotation; then, through the Fourier-Mellin method, the full-day surface image is converted to the logarithmic-polar space to measure the fine rotation amount, and the fine rotation angle is obtained. According to the measurement The amount of fine rotation, the full-sun im...

Embodiment 2

[0044] Embodiment 2: as Figure 1-10 As shown, a method for image registration in high-resolution solar images is implemented as follows: First, preprocess the high-resolution solar images and full-helioscopic images that need to be registered, and read the two images The basic data are processed according to the initial estimated value; then, the full-sun image is divided into blocks, and the position of the high-resolution image in the full-sun image is searched by the cross-correlation method; secondly, the maximum block direction angle method is used, Select the largest sunspot in the target, calculate the direction angle after binarization, and obtain the difference between the direction angle of the full-sun surface image and the high-resolution image as the rough rotation angle; The rough rotation operation is performed on the basis of the initial rotated image; then, the cross-correlation method is used to re-search the position of the high-resolution image in the full...

Embodiment 3

[0056] Embodiment 3: as Figure 1-10 As shown, a method for image registration in high-resolution solar images is implemented as follows: First, preprocess the high-resolution solar images and full-helioscopic images that need to be registered, and read the two images The basic data are processed according to the initial estimated value; then, the full-sun image is divided into blocks, and the position of the high-resolution image in the full-sun image is searched by the cross-correlation method; secondly, the maximum block direction angle method is used, Select the largest sunspot in the target, calculate the direction angle after binarization, and obtain the difference between the direction angle of the full-sun surface image and the high-resolution image as the rough rotation angle; The rough rotation operation is performed on the basis of the initial rotated image; then, the cross-correlation method is used to re-search the position of the high-resolution image in the full...

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Abstract

The present invention relates to an image registration method applied to a solar high-resolution image and belongs to the astronomical technology and image processing field. The method includes the following steps that: the image is pre-processed, and the position of the high-resolution image in a full-solar surface image is obtained through preliminary matching; direction angle difference is calculated by using a maximum block direction angle method, so that a rough rotation angle can be obtained; rough rotation is carried out based on the preliminary matching according to the rough rotation angle; fine rotation quantity is measured in a log-polar space, so that a fine rotation angle can be obtained, fine rotation is carried out based on the rough rotation according to the fine rotation angle; the value of cross correlation between a template image and a search window is calculated through adopting a cross-correlation method, so that the conversion matrix of matching points can be obtained, a rotation angle and a scale are calculated, and registration is carried out based on the fine rotation; and a registered image can be obtained. According to the method of the invention, based on the cross correlation method and Fourier-Mellin method, the rough matching and fine matching-combined method is adopted, and therefore, the precision of registration can be effectively increased.

Description

technical field [0001] The invention relates to a method for image registration in high-resolution images of the sun, in particular to an image registration method for high-resolution images of the sun that combines the cross-correlation method and the Fourier-Mellin method, and is suitable for images that exist between images. The invention relates to an image of scaling, rotation and translation transformation relations, belonging to the fields of astronomy technology and image processing. Background technique [0002] There are various activities in solar images. Therefore, in order to obtain their positions and relationships more accurately, it is often necessary to take a large number of high-resolution images and full-helioscopic images for image registration when conducting research on solar images. . [0003] At present, according to the difference between different image information, image registration methods are divided into two main categories, one is the image ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/32
CPCG06T2207/10004G06T2207/20021
Inventor 戴伟冯涛季凯帆杨云飞冯松王峰邓辉
Owner KUNMING UNIV OF SCI & TECH
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