Automatic checking method for dimension line marking error in engineering drawing

An automatic inspection and dimensioning technology, applied in the field of dimension line recognition, can solve the problems of multiple marks, missing marks, and low efficiency of manual inspection, and achieve the effects of avoiding design errors, improving design efficiency, and saving manual inspection costs

Inactive Publication Date: 2009-06-03
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an automatic inspection method for dimension line labeling errors in engineering drawings for the defects of missing dimensions, multiple labels, labeling conflict errors, and low manual inspection efficiency in a large number of dimension lines in CAD engineering drawings

Method used

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  • Automatic checking method for dimension line marking error in engineering drawing
  • Automatic checking method for dimension line marking error in engineering drawing
  • Automatic checking method for dimension line marking error in engineering drawing

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Embodiment Construction

[0041] The inventive method such as figure 1 shown. figure 2 An example of an actual engineering drawing is given, in which there are a large number of scattered dimension lines to give precise dimensional descriptions of various engineering objects.

[0042] Step 1 Import a drawing with dimension lines.

[0043] The initial threshold d in step 2 is calculated according to the average height of strings in the engineering drawing;

[0044] Steps 3-4 detect and sort stray lines in the drawing. The extraction of free lines in step 3 includes the following steps: (a) Check the endpoint connection of the straight line segment in the engineering drawing, if there is no intersecting line at the two ends, mark it as a free line, otherwise mark it as an excluded line ; (b) If the length of a free line is less than 0.5d, or greater than 3d, it will be marked as an excluded line; (c) if there is no vertical intersecting line in the middle of a certain free line, it will be marked as ...

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Abstract

The invention provides an automatic checking method for dimension line marking errors in an engineering drawing. The method comprises the following steps: on the basis of dissociated lines in the engineering drawing, by automatically identifying the shapes of a large quantity of dissociated dimension lines in the engineering drawing, the dissociated dimension lines are combined into a dimension line group, then, the dimension identification character strings of the dimension lines are searched by bilateral matching method, and whether the errors of mark missing or excess marks exist in the dimension marks are checked during the matching process; By inputting an engineering drawing into a CAD environment, the shapes and the marks of a large quantity of dissociated dimension lines can be quickly identified, and whether the dimension marking errors such as dimension mark missing, excess marks or dimension mark conflict exist is detected through the matching of the dimension line shapes and the identification character strings and the generation of an axis net, thereby saving a large amount of expense on manual check, reducing or avoiding design error, and effectively improving the efficiency of CAD.

Description

technical field [0001] The invention discloses a dimension line recognition method in engineering drawings, in particular to an automatic checking method for dimension line label errors in engineering drawings. Background technique [0002] CAD technology has been widely used in many engineering fields including machinery, manufacturing, construction, electronics, chemical industry, roads and bridges. On the CAD platform, designers draw various engineering drawings to express design information, and dimension lines are one of the basic data types that must be drawn in various engineering drawings. By drawing a large number of dimension lines, designers can precisely define and describe the size, shape, section, length, height, position and eccentricity of various engineering objects. All kinds of engineering personnel in subsequent processes (such as budget estimation, bidding, construction or processing, etc.) can obtain accurate engineering data and complete corresponding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 路通
Owner NANJING UNIV
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