Method for automatic extraction of orthoimage embedding line based on projection digital elevation models

A digital elevation model and orthophoto technology, applied in image analysis, image enhancement, image data processing, etc., can solve the problems of low production efficiency and low quality of mosaic lines, improve production efficiency, reduce the workload of manual intervention, The effect of improving quality

Active Publication Date: 2014-06-18
WUHAN UNIV
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  • Application Information

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Benefits of technology

This patented technology allows for accurate computation of differences from different images captured atop one another's footprint or street level through projecting models onto specific surfaces like buildings or roads. By analyzing these patterns, it helps identify any changes caused during construction without relying solely upon visual inspection alone. Overall, this method simplifies process management while also enhancing productivity.

Problems solved by technology

This patented technical solution involves automatically extracting line segments based upon predetected changes caused by different factors such as light conditions during flight measurement, terrain fading due to air movement, and variations in camera parameters like focus depth. However, current solutions have limitations including slow processing speed, difficulty identifying boundaries, and lack of automation capabilities.

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  • Method for automatic extraction of orthoimage embedding line based on projection digital elevation models
  • Method for automatic extraction of orthoimage embedding line based on projection digital elevation models
  • Method for automatic extraction of orthoimage embedding line based on projection digital elevation models

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[0043] The present invention accurately locates the projection difference area on the single-slice orthophoto based on the projection digital elevation model, and then extracts the path that avoids the projection difference area on the single-slice orthophoto through image morphology processing and computational geometry operation, and uses it as the single-slice orthophoto Mosaic lines during orthophoto mosaic processing, so as to realize automatic mosaic of orthophoto products.

[0044] In order to better understand the technical solutions and technical effects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings. See figure 1 , the concrete steps of the inventive method are as follows:

[0045] Step 1, based on the principle of projected digital elevation model, using the DTM and DSM data of the single-slice orthophoto to obtain the projected digital elevation model of the single-slice orthophoto.

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Abstract

The invention discloses a method for automatic extraction of an orthoimage embedding line based on projection digital elevation models. The method comprises the steps that firstly, the projection digital elevation model of a single orthoimage is obtained; secondly, an orthoimage pair to be embedded is determined; thirdly, the projection digital elevation models of the orthoimage pair to be embedded are overlapped according to geographic coordinates, an overlapping image is obtained, the overlapping image is binarized, and then the binary overlapping image is obtained; fourthly, the image morphological method is adopted for extracting skeleton lines of the binary overlapping image, a skeleton line network is obtained, the Dijkstra algorithm is adopted for searching the skeleton line network for the shortest path, namely the embedding line of the orthoimage pair to be embedded. By means of the method, the high-quality orthoimage embedding line can be obtained automatically, and the production efficiency of orthoimage products can be improved; meanwhile, information of digital terrain model data and digital surface model data is used for searching for the embedding line, and therefore the quality of the orthoimage products can be improved.

Description

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Application Information

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Owner WUHAN UNIV
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