Narrow-view-field double-camera image fusion method based on large virtual camera

Abstract

The invention discloses a narrow-view-field double-camera image fusion method based on a large virtual camera. The narrow-view-field double-camera image fusion method comprises the steps of constructing the large virtual camera according to two single cameras, and constructing geometric imaging parameters of the large virtual camera according to geometric imaging parameters of the two single cameras; constructing corresponding geometric imaging models according to the geometric imaging parameters of the two cameras and the large virtual cameras; calculating and outputting a rational polynomial model coefficient corresponding to the large virtual camera; respectively performing indirect-method geometric correction on images of the two single cameras according to a coordinate forward calculation process and a coordinate back calculation process based on the geometric imaging models to obtain two images under an image coordinate system of the large virtual camera, and obtaining a fused image of the large virtual camera. According to the narrow-view-field double-camera image fusion method based on the large virtual camera, the concept of the large virtual camera is ingeniously used; high-precision fusion of the images of the two cameras in a narrow view field is realized, and the rational polynomial model coefficient corresponding to the large virtual camera is supplied; furthermore, the processing procedure is fully automatic, and manual intervention is not needed; the narrow-view-field double-camera image fusion method is applicable to a ground preprocessing procedure.

Description

technical field [0001] The invention belongs to the field of aerospace and aerial photogrammetry, and relates to a narrow-field dual-camera image splicing method based on a large virtual camera when two narrow-field linear array cameras push-broom imaging simultaneously. Background technique [0002] Linear push-broom imaging is the main sensor for obtaining high-resolution optical satellite images at present. In order to improve the spatial resolution of optical images, a telephoto lens is often used; while the telephoto lens narrows the observation field of view; in order to increase the observation field of view, multiple CCDs (charge-coupled device image sensors) are used to splice or multiple cameras simultaneously way of observation. In the case of simultaneous observation by multiple cameras, each camera has an independent optical system and follows its own geometric imaging model, which brings additional work to subsequent geometric processing. [0003] There are t...

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Problems solved by technology

The other is to do image stitching based on point matching of the same name only based on the images in the overlapping area of ​​the dual cameras, regardless of the geometric conditions of the original single-camera imaging; the stitched images obtained by this method lack a strict physical imaging model, and the geometric accuracy comparison Poor, difficult to meet the needs of fields such as surveying and mapping

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