Automatic Extraction Method of Orthophoto Mosaic Line Based on Projection Digital Elevation Model

Abstract

The invention discloses a method for automatically extracting a mosaic line of an orthophoto image based on a projection digital elevation model, comprising the steps of: step 1, obtaining a projection digital elevation model of a single piece of orthophoto image; step 2, determining a pair of orthophoto images to be mosaiced; Step 3, superimpose the projected digital elevation model of the orthophoto pair to be mosaiced according to geographic coordinates to obtain a superimposed image, and binarize the superimposed image to obtain a binary superimposed image; Step 4, use the image morphology method to extract the skeleton of the binary superimposed image The skeleton line network is obtained by using the Dijkstra algorithm, and the shortest path is searched in the skeleton line network, that is, the mosaic line of the image pair to be mosaiced. The method of the invention can automatically obtain high-quality orthophoto mosaic lines, which can improve the production efficiency of orthophoto products; meanwhile, the information of digital ground model data and digital surface model data is used to find mosaic lines, which can improve the quality of orthophoto products .

Description

technical field [0001] The invention belongs to the technical field of automatic production of orthophoto products, one of surveying and mapping products, and in particular relates to an automatic extraction method of orthophoto mosaic lines based on a projection digital elevation model. Background technique [0002] In the production of surveying and mapping products, when using photogrammetry to produce orthophoto products using aerial images, it is necessary to mosaic multiple ortho-corrected images into a larger image, and then cut them according to certain specifications to obtain an image map in the form of a standard map . The key to the image mosaic process is that the mosaic lines need to avoid the difference areas between the images, otherwise there will be incomplete ground objects on the mosaic image, which will affect the final mosaic effect. In order to ensure the quality of orthophoto products, a lot of manual intervention is often required in production to k...

AI Technical Summary

Problems solved by technology

[0014] Aiming at the problems of low production efficiency and low quality of mosaic lines caused by manual intervention of mosaic lines in the production of orthophoto products in the prior art, the present invention provides a projection-based digital elevation model with higher production efficiency and better quality of mosaic lines Automatic extraction method of orthophoto mosaic line

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