Method for preparing typical ground object reference picture by using multispectral image classification

Abstract

The invention discloses a method for preparing a typical ground object reference picture by using multispectral image classification. An interesting type is extracted from a multispectral image and is taken as a landmark, and the reference picture comprising the landmark can be prepared and is used for indirectly positioning and identifying a target. The method specifically comprises the following steps of: selecting the interesting type from the multispectral image, extracting a spectral-spatial texture characteristic of the interesting type, and classifying the multispectral image according to the extracted spectral-spatial texture characteristic; on the basis of classification, extracting the complete interesting type, and taking the interesting type as the interesting type of the landmark according to a landmark selection rule; calculating an infrared radiation amount of the landmark under an atmospheric parameter condition by using an infrared radiation formula according to a landmark material type; and mapping the infrared radiation amount to obtain a gray scale value, and preparing the reference picture comprising a landmark shape, the gray scale of the landmark shape and a background gray scale. According to the method, accuracy and automation are relatively high, and the performance of a matching and identification algorithm based on the reference picture can be improved.

Description

technical field [0001] The invention belongs to the technical field of image recognition, and in particular relates to a method for preparing a reference map using multispectral image classification, which is used for preparing reference maps of typical ground objects and is suitable for target recognition in aircraft navigation and guidance. Background technique [0002] With the development of infrared imaging and guidance technology, the research on the characteristics of target background radiation and its infrared imaging features has been paid more and more attention by researchers at home and abroad, which is of great significance in the field of aircraft navigation and guidance research. Under different time phases, different climates, different lighting conditions, and long-distance imaging conditions, the optical images acquired by the imaging sensor present different characteristics and are complex and changeable, especially when the target features are not obvious...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a reference map preparation method using multispectral image classification, which uses a variety of feature information to quickly classify multispectral images, extract relatively complete classes of interest, select some of them as landmarks, and Predict the infrared characteristics of landmarks to solve the problem of indirect positioning and identification of targets in complex environments by preparing feature reference maps containing landmarks when the target features are not obvious in the navigation and guidance process of the aircraft. support

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