Method for automatic vectorization of road network digital raster map

Abstract

The invention relates to a method for the automatic vectorization of a road network digital raster map in the technical field of image processing. Firstly, the road network digital raster map is read into a computer memory, a road crossing on a road network image, which comprises a crossed road crossing and a road terminal, is detected, and pixels consisting of the road crossing are marked; secondly, each road crossing is used as a center to detect an adjacent road crossing, a pixel chain from the road crossing to each adjacent road crossing is formed simultaneously, and nodes are added at intervals to each pixel chain, thereby obtaining pattern points recording the shape of a road; and finally, redundant nodes which are added in the step two are deleted, and a vectorization result is preserved according to the normal vector map format. The road network vector digital map formed by the invention can bring great convenience for the operation of locus correction of an intelligent transportation system and a vehicle navigation system.

Description

Automatic Vectorization Method of Raster Digital Map of Road Network technical field The invention relates to a method in the technical field of image processing, in particular to an automatic vectorization method for a road network raster digital map. Background technique The vectorization of the road network raster digital map refers to converting the road network raster digital map into a road network vector digital map. A raster digital map is a bitmap (also known as a bitmap) that reflects the geographic features and topological structure of map elements. Raster digital maps have the advantages of easy generation, detailed content, and easy acceptance by customers, but there are also disadvantages such as large data volumes, difficulty in analysis and decision-making (including path optimization, trajectory correction, etc.), so it is difficult to directly apply to intelligent Transportation, vehicle navigation and other fields. Vector digital map is a vectorized da...

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Problems solved by technology

Compared with the hand-held tracking vectorization method, this method has made great progress, but it still has the following disadvantages: 1) It needs to purchase professional scanning vectorization software, which is expensive; 2) It cannot be based on specific ground objects (such as the road in this paper). network) to implement high-precision vectorization; 3) it needs to be completed under the operator's operation and supervision, and has not achieved full automation

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