Rock-core hyperspectral-data geometric distortion correction method based on triangle scaling method

Abstract

A rock-core hyperspectral-data geometric distortion correction method based on a triangle scaling method is disclosed. The method comprises the following steps of (1) reading in rock-core hyperspectral data; (2) according to a spectrum characteristic, determining and extracting a wave band of a scaling triangle; (3) using a smooth linear space filter to carry out filtering processing on an image and using a threshold segmentation method to carry out crude extraction on the scaling triangle; (4) using a result acquired from the step (3) to carry out expansion and corrosion processing, eliminating irregular boundary points and acquiring the scaling triangle and an interference area which are not connected; (5) taking an area of the scaling triangle in rock core data as a threshold, eliminating the interference area and acquiring the scaling triangle; (6) using a Canny edge detector to carry out edge detection on the scaling triangle and extracting contour information of the scaling triangle; and (7) using Hough transform to search a straight line in a scaling triangle contour, taking a straight line gradient and a length as thresholds, extracting a hypotenuse line segment end point of the scaling triangle which generates distortion, and taking the end point as a control point so as to carry out geometric distortion correction.

Description

(1) Technical field [0001] The invention relates to a method for correcting geometric distortion of rock core hyperspectral data by using an image processing method, which belongs to the technical field of hyperspectral data processing methods and applications, and is suitable for the theoretical method and application technology research of hyperspectral data geometric distortion correction. (2) Background technology [0002] The hyperspectral imager is a new type of remote sensing payload. Its spectrum is compact and continuous, and it can simultaneously record the spectral and spatial information characteristics of the same ground object. Can be detected in spectral remote sensing. The core is the first-hand information obtained by drilling and coring. Through the analysis of the core, the age of the stratum can be determined, the lithology, physical properties, electrical properties and oil-bearing properties of the stratum can be studied, and the depositional environmen...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a geometric distortion correction method for rock core hyperspectral data based on the triangle calibration method. This method can automatically identify the distortion area by using image segmentation and recognition methods, and extract the edge feature points of the distortion area, and use the feature points as Control points, effectively solve the problem of no fixed control points in the core image data, provide a basis for geometric correction, and perform geometric distortion correction

[0005] The technical solution of the present invention is: for the problem that it is difficult to select a fixed control point in the continuously changing core data when there is tension and compression geometric distortion in the core image data collected by the core imaging spectrometer, and it is difficult to perform geometric correction, A geometric correction method based on the triangle calibration method is proposed

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