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Global Elevation Optimization Method Based on Block-Based Image Matching Digital Surface Model

A digital surface model and image matching technology, applied in image data processing, image analysis, instruments, etc., can solve the problems affecting the IMDSM elevation accuracy and 3D visual effects, and achieve the elimination of elevation steps, low time complexity, and 3D visualization. good visual effect

Active Publication Date: 2019-08-20
WUHAN ENG SCI & TECH RESINST
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AI Technical Summary

Problems solved by technology

Therefore, although the time complexity of the 1D label algorithm is low, the IMDSM generated by the 1D label algorithm will have obvious "elevation steps" in the slope area, which will affect the elevation accuracy and 3D visual effect of the IMDSM

Method used

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  • Global Elevation Optimization Method Based on Block-Based Image Matching Digital Surface Model
  • Global Elevation Optimization Method Based on Block-Based Image Matching Digital Surface Model
  • Global Elevation Optimization Method Based on Block-Based Image Matching Digital Surface Model

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0043] The present invention aims at the image matching digital surface model produced in the current actual engineering application, the ubiquitous problem of elevation steps, such as figure 1 As shown, a block-based image matching digital surface model global elevation optimization method is proposed. The method does not need iteration, can directly and quickly obtain the optimized image matching digital surface model, can effectively solve the problem of elevation steps, makes the optimized image matching digital surface model have a continuous and smooth surface, and has a good three-dimensional visual effect. figure 1 (a) represents the original image, figure 1 (b) means that the image matching digital surface model based on the image matching can be compared and analyzed to find that the original image matching digital surface model has o...

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Abstract

The invention relates to a block based overall elevation optimizing method for an IMDSM (Image Matching Based Digital Surface Model). The method includes steps of 1, inputting an original IMDSM; 2, segmenting the input original IMDSM into a series of regular blocks; 3, constructing data items in an overall energy function; 4, constructing smoothing items in the overall energy function; 5, based on the data items and the smoothing items, constructing an overall energy function and resolving the function; performing a feathering algorithm and eliminating splicing gaps between the blocks. According to the invention, a problem of elevation steps existing in a prior IMDSM can be solved effectively; the optimized IMDSM surface is continuous and smooth and the three-dimensional visual effect is good. According to the invention, the IMDSM optimization problem is converted to an extreme value calculation problem of a matrix function; no iteration is needed; a overall optimal solution can be calculated directly; time complexity is low; and large scale DSM overall optimization is promoted.

Description

technical field [0001] The invention relates to the technical field of elevation optimization for image matching digital surface models, in particular to a block-based global elevation optimization method for image matching digital surface models. [0002] technical background [0003] Image Matching Based Digital Surface Model (IMDSM) refers to the acquisition of digital 3D models of large-scale natural and artificial surfaces through image dense matching technology. The images required to produce IMDSM include satellite images, aerial images, UAV images, etc. IMDSM generation technology is one of the core technologies in the fields of computer vision and digital photogrammetry. It plays an important role in applications such as digital earth, navigation and positioning, cruise obstacle avoidance, cultural relics reconstruction, emergency rescue and relief, post-disaster reconstruction, and spatial database update. . [0004] The traditional IMDSM production process often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/33G06T7/10
Inventor 黄旭金彦胡堃叶辉周超
Owner WUHAN ENG SCI & TECH RESINST
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