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Method and device for scaling images in level-of-detail models

A level of detail, image technology, applied in image generation, image data processing, graphics and image conversion, etc., can solve problems such as large amount of calculation, low efficiency, reduce LOD rendering effect, etc., to achieve the effect of avoiding distortion

Active Publication Date: 2016-01-27
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, this solution needs to change the measured elevation coordinates according to the change of the viewpoint, which affects the accuracy of the entire model
In addition, in this solution, the position of the terrain block needs to be recalculated for each point within the range of the viewpoint, which has a large amount of calculation and low efficiency, and will reduce the overall rendering effect of LOD

Method used

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  • Method and device for scaling images in level-of-detail models
  • Method and device for scaling images in level-of-detail models
  • Method and device for scaling images in level-of-detail models

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Embodiment Construction

[0013] Exemplary embodiments of the present application are described below with reference to the accompanying drawings.

[0014] figure 1 A flow chart of an exemplary method 100 for scaling an image in an LOD model according to one embodiment of the present application is shown. As mentioned above, the LOD model includes discrete LOD levels, and different LOD levels correspond to different planar mesh models and image data. The image data here can include vertex data and texture data attached to the mesh.

[0015] As shown in the figure, in step S101, preprocessing is performed according to the image data stored in the LOD model to determine a fitting function for each vertex coordinate of the image, and the fitting function represents the mapping relationship between the vertex coordinates and the LOD level. Specifically, a plurality of vertex coordinates at each LOD level of a vertex representing the same position in the LOD model may be extracted and fitted, for example,...

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Abstract

Disclosed are a method and an apparatus for zooming an image in a level of details model, and image data of the image under multiple level of details ranks is stored in the level of details model. The method comprises: determining a fitting function of each vertex coordinate of the image in advance according to image data stored in the level of details model, the fitting function representing mapping between a vertex coordinate and a level of details rank; based on the fitting function and a target level of details rank of the image, determining each vertex coordinate of the image under the target level of details rank, so as to generate a new data block corresponding to the target level of details rank; and performing rendering by use of the new data block.

Description

technical field [0001] The present application relates to the field of data services, and in particular, relates to a method and device for zooming images in a Level of Details (LOD) model. Background technique [0002] With the development of aerial photogrammetry and satellite remote sensing technology, 3D browsing of massive terrain image data has become a research hotspot. However, limited by computer memory and operating system management capabilities, it is obviously not feasible to put all the data into the memory and render directly. LOD technology simplifies the details of objects according to certain rules, and selects object expression methods with different levels of detail, which is an effective means to solve the problem of rapid rendering of large-scale terrain image data. In the LOD model, a higher level of detail is selected for image data close to the observer, and a lower level of detail is selected otherwise. [0003] Now mainstream commercial GIS syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/00
CPCG06T3/40G06T17/20G06T2210/36
Inventor 邢辉峰温亮生贺赢阎啸天
Owner CHINA MOBILE COMM GRP CO LTD