Engineering drawing vector conversion and primitive semantic extraction method

Abstract

The invention provides an engineering drawing vector conversion and primitive semantic extraction method. The method comprises the following steps: S1, utilizing a scripting language to extract information data in a PDF (Portable Document Format) drawing document or generate corresponding BMP (Bitmap) image data, and further pre-processing the document in the image format; S2, utilizing the seed segment algorithm to vectorize straight-line primitives in the image data; S3, vectorizing circles / circular arcs in the image data; S4, identifying the primitive relationship and utilizing the text / graphics separation algorithm based on connected region to remove labeling frames and graphics information on the drawing images; and S5, outputting the result. Through pretreatment of the text / graphics separation algorithm and the improvement on the seed segment vector conversion method, the engineering drawing vector conversion and primitive semantic extraction method improves the vector conversion accuracy and processing speed, and better solves the difficult problems in extracting the pattern semantic information through the rule matching algorithm, thereby providing a better data foundation for intelligent machine drawing reading and three-dimensional reconstruction.

Description

technical field [0001] The invention relates to the technical field of semantic information extraction of graphic elements of engineering drawings and drawing vectorization. Background technique [0002] Raster to Vector Conversion (RVC for short) is to use computer graphics, digital image processing, artificial intelligence and other comprehensive technologies to convert engineering drawings saved in raster image format into the computer through a scanner, and recognize The process of converting it into vector graphics and finally saving them in a format that CAD software can recognize. Raster graphic vectorization has broad application prospects not only in the field of mechanical design, but also in various engineering design, geographic information and other industries, and has important theoretical and practical significance. [0003] In addition, in addition to the graphic element information, an actual engineering drawing is mainly composed of three parts: graphic el...

AI Technical Summary

Problems solved by technology

[0006] At present, there are vpstudio software from Germany, R2v software from Able Company and other drawing vectorization software. These software can carry out vectorization of drawings to a certain extent, but they are not perfect, and the accuracy rate of vectorization is not very high. , there are various deficiencies

At the same time, in the semantic extraction of primitives, the effect is relatively poor, and it cannot accurately identify arrows, labels, etc. (basically, it recognizes text as multi-segment straight lines)

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