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Urban orthoimage mosaic processing method and system

A technology of orthophoto and processing method, which is applied in the automatic urban orthophoto mosaic processing method and system, high-performance field, can solve the problems of low search efficiency, seam line crossing obstacles, discontinuity, etc., to improve processing efficiency Effect

Inactive Publication Date: 2019-11-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

Most of the existing algorithms construct the search cost image based on the gray level difference information of the overlapping area of ​​the image, but such information only approximates the edge of obstacles such as buildings, and is not continuous, resulting in the unavoidable situation where the seam line crosses obstacles; in addition, Due to the generally high pixel resolution of aerial remote sensing images, some existing mosaic line search methods adopt a pixel-by-pixel path search strategy. The number of pixel nodes to be evaluated in the processing process is too large, and the search efficiency is low, which needs further improvement.

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  • Urban orthoimage mosaic processing method and system
  • Urban orthoimage mosaic processing method and system
  • Urban orthoimage mosaic processing method and system

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[0070] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0071] Voronoi Diagram (Voronoi Diagram) is the basic data structure of space division in the field of computational geometry. It consists of a group of continuous polygons composed of perpendicular bisectors connecting two adjacent straight lines. Its mathematical definition is as follows: Suppose P={p 1 ,p 2 ,p 3 ,...,p n}, (3≤ni The Voronoi polygon V(p i )defined as:

[0072] V(p i )={p∈R 2 |d(p,p i )≤d(p,p j ), i, j=1,2,3,...,n, i≠j};

[0073] where p is any point on the plane, d(p,p i ) and d(p,p j ) are points p and p respectively i and p j...

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Abstract

The invention discloses an urban orthoimage mosaic processing method and system, and the method comprises the steps: firstly generating an initial mosaic network based on a Voronoi diagram, and determining the contribution range of each image on a mosaic result; and then adjusting the vertexes of the mosaic network based on the DSM data to avoid the generation of splicing loopholes, and meanwhile,enabling the nodes to avoid obstacle areas with poor projection, such as buildings and trees. After the initial mosaic network is constructed and adjusted, trend optimization is carried out on each section of mosaic line. Firstly, DSM data in a search range is processed to construct a search cost image, then an improved JPS algorithm is used for searching and evaluating key jump nodes, the searchefficiency is improved, and an optimal mosaic line avoiding an obstacle area is extracted. The images are spliced according to the optimized mosaic lines to form a final high-quality seamless mosaicimage.

Description

technical field [0001] The invention belongs to the technical field of photogrammetry, and relates to a mosaic processing method and system for urban orthophoto images, in particular to a high-performance, automated method and system for mosaic processing of urban orthophoto images. Background technique [0002] The digital orthophoto is made by using the digital elevation model (Digital Elevation Model, DEM) to correct the pixel-by-pixel geometry, and the DEM does not take into account the height of the object on the ground, so the top of the surface entity on the ortho-corrected image has no Corrected to the proper plane position (coincident with the bottom), so there is still a projection difference in the areas above the ground surface such as buildings and trees. If the generated mosaic line passes through these areas on the image, there will be obvious gaps in the mosaic image The geometric dislocation of the image destroys the integrity of the ground features. Compar...

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Application Information

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IPC IPC(8): G06T5/30G06T5/50G06T7/11G06T7/13G06T7/136G06T7/60
CPCG06T5/30G06T5/50G06T7/60G06T7/11G06T7/13G06T7/136
Inventor 陈松陈刚
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)