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Cascade-based method for seamlessly superposing two-dimensional vectors on three-dimensional topography surface

A technology of three-dimensional terrain and two-dimensional vector, which is applied in image data processing, 3D modeling, instruments, etc., can solve problems such as linear vector and text vector jaggedness, Chinese characters are difficult to read, and the effect is not ideal, so as to suppress the problem of aliasing and improve Utilization, anti-aliasing effect is remarkable

Active Publication Date: 2011-08-10
ZHEJIANG UNIV
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Problems solved by technology

However, the anti-aliasing effect of this method is still not ideal. Linear vectors and text vectors still have problems such as jaggedness and blurring. At the same time, the complexity of Chinese is much higher than that of English letters. It is particularly important to ensure the ideal anti-aliasing effect when drawing Chinese text vectors

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  • Cascade-based method for seamlessly superposing two-dimensional vectors on three-dimensional topography surface
  • Cascade-based method for seamlessly superposing two-dimensional vectors on three-dimensional topography surface
  • Cascade-based method for seamlessly superposing two-dimensional vectors on three-dimensional topography surface

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Embodiment Construction

[0021] In order to describe the present invention more specifically, the cascading-based superposition vector method of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0022] Such as figure 1 As shown, a cascade-based method for seamlessly superimposing two-dimensional vectors on a three-dimensional terrain surface includes the following steps:

[0023] (1) Select a segmentation strategy for subdividing the quadrangular pyramid of the viewing area.

[0024] It is judged according to the angle between the current line of sight direction and the terrain surface. If it exceeds the specified threshold, the curtain space subdivision method will be used. Otherwise, the depth subdivision method will be used. Generally, the threshold can be set to about 80°. The curtain space subdivision method is suitable for the line-of-sight direction almost perpendicular to the terrain surface, and the depth subdivision method i...

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Abstract

The invention discloses a cascade-based method for seamlessly superposing two-dimensional vectors on a three-dimensional topography surface. The method comprises the following steps of: (1) selecting a segmentation strategy for segmenting a view field pyramid; (2) performing cascade segmentation on the view field pyramid; (3) distributing vector information to sub view field pyramids; (4) completing narrow-down approximation of the vector information, and drawing vector textures; and (5) seamlessly superposing the vector textures on the three-dimensional topography. By carrying out cascade segmentation on the view field pyramid and surrounding frame-based narrow-down approximation on the vector information, the pixel utilization rate of the vector textures is greatly improved, the problemof deformation is inhibited to a large extent, the drawing effect is remarkably enhanced, thus the method can be well applied in a large scene roaming system and a three-dimensional geographic information system.

Description

technical field [0001] The invention belongs to the technical field of computer graphics and three-dimensional geographic information system application, and in particular relates to a cascade-based method for seamlessly superimposing two-dimensional vectors on a three-dimensional terrain surface. Background technique [0002] In the application of 3D GIS, 2D vector data is still an indispensable way of expression. 2D vector data includes points, lines, surfaces (polygons) Rivers, place names, etc. At present, multi-resolution multi-temporal remote sensing image data and global digital elevation model data that are more and more beautiful and realistic are widely available in the network environment. The mixed application of 2D vector maps, remote sensing images and 3D terrain surface models has become commonplace for ordinary people. At the same time, in various geographic information system analysis functions, the visualization application of two-dimensional vector data i...

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Application Information

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IPC IPC(8): G06T19/20G06T17/05G06T17/30
Inventor 郑文庭李融
Owner ZHEJIANG UNIV
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