True-orthophotomap making method oriented to large-scale production

A technology of orthophotographs and production methods, which is applied in image data processing, 3D image processing, instruments, etc., can solve the problem of being unable to deal with the false visibility of targets obscured by high and narrow walls, increasing the workload and complexity of calculations, and three-dimensional volume Problems such as block model representation can overcome the problems of false visibility and false occlusion, the application range and market prospects are broad, and the algorithm is universal

Inactive Publication Date: 2012-06-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of method is very inefficient when dealing with a large number of complex vector building models; when dealing with raster data, it is difficult to capture the raster deformation caused by camera distortion and projection imaging, which will lead to wrong judgments on the competition relationship, resulting in a large number of artifacts. Occlusion and Pseudo Visible Noise
In addition, this method cannot deal with the pseudo-visibility problem of targets obscured by tall

Method used

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  • True-orthophotomap making method oriented to large-scale production
  • True-orthophotomap making method oriented to large-scale production
  • True-orthophotomap making method oriented to large-scale production

Examples

Experimental program
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Effect test

Embodiment 1

[0074] Such as image 3 As shown, the data source.

Embodiment 2

[0076] Such as Figure 4 , Figure 5 As shown, occlusion detection.

[0077] It can be seen from the figure that Z-Buffer always consumes the longest time at any size, followed by the radial scanning method, followed by the spiral scanning method, and the optimal segmentation radial scanning method consumes the shortest time. This shows that the optimally segmented radial scan method has the highest efficiency among these methods.

Embodiment 3

[0079] Such as Image 6 Shown, occlusion repair.

[0080] Image 6 The process of inpainting using multiple overlapping images is shown. This group of data was repaired using 4 overlapping images of front, back, left, and right. Experiments have shown that overlapping images can repair occlusions to varying degrees. Ideally, the "dead angle" can be eliminated and the image can be completely repaired.

[0081] The field of application of the present invention has:

[0082] 1) Improve the quality of 4D products in the field of surveying and mapping. The orthophoto is one of the 4D products, and the invention can be used to mass-produce the real orthophoto with higher precision and application value, and update the manufacturing process of the 4D product.

[0083] 2) Serve the construction of digital cities and smart cities. Orthophotos are an important base map for digital cities and smart cities. True orthophotos can correct the geometric coordinates of urban high-rise b...

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Abstract

The invention provides a true-orthophotomap making method oriented to large-scale production. The method comprises the following steps of: S1) data source processing: preprocessing the acquired digital surface model and remote sensing image; S2) occlusion detection: detecting the region occluded by buildings; S3) occlusion restoration: restoring the detected occluded region according to the visibility of multiple overlapped images, and obtaining the orthophotomap; S4)image mosaicking: combining multiple neighboring orthophotomaps obtained in the step S3 in a mosaicking manner, toning, and obtaining the true-orthophotomap. The method is efficient, quick, accurate and steady, and has wide adaptive range.

Description

technical field [0001] The invention is oriented to the production of basic image maps, and relates to fields such as surveying and mapping, digital cities and smart cities, and network image map services. Background technique [0002] Traditional orthorectification does not take into account the projection deformation of ground objects such as buildings and trees. On large-scale orthophoto images of cities, the oblique occlusion of buildings is very serious, which affects the effective interpretation and utilization of image information. Since the 1990s, with the rise of urban 3D simulation projects around the world and the increasing demand for the application of large-scale urban maps, the research and production of "true orthophotos" using urban 3D models has gradually begun. However, due to the limitations of data sources and occlusion detection technology, real orthophoto production has been difficult to put into large-scale production. [0003] A central issue in tru...

Claims

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Application Information

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IPC IPC(8): G06T15/40
Inventor 钟成李卉黄先锋李德仁
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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