An Automatic Recognition Method of Similar Vector Maps in CAD Drawings
A technology of automatic recognition and vector graphics, applied in the field of automatic recognition of similar vector graphics, can solve the problems of discrete relative positions of graphics elements, difficulty in recognizing images, low efficiency, etc., and achieve high accuracy, convenient operation and high recognition efficiency Effect
Active Publication Date: 2021-08-27
青矩技术股份有限公司
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AI Technical Summary
Problems solved by technology
Under normal circumstances, if all the primitives are combined in turn, then converted into a bitmap, and then recognized by the existing image recognition method, the efficiency will be very low
Moreover, because the whole image is relatively large, the relative positions between the primitives are relatively discrete, and it will be distorted after being converted into a bitmap, making it difficult to recognize the image
Method used
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Examples
Experimental program
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Effect test
Embodiment 1
[0065] First, click and select the primitives that make up a graph in the drawing;
[0066] Next, click OK, and the system will automatically recognize all graphics similar to the selected graphics (including rotated ones) in the drawing, as shown in Figure 2(a) and (b), and the realization principle is as follows:
[0067] In a two-dimensional plane, each geometric object has its own feature points, which determine the shape of the geometry. For example, a line segment has a starting point and an end point; a circle has a center and a radius; an arc has a center, radius, starting angle, Terminating corner; Text has center point, content; Rectangle has corner point, center point, etc.
[0068] When the object is picked, the program automatically extracts the positional relationship between the graphic feature points (expressed by feature point distance) and converts it into a numerical value. The program searches for other objects with the same feature points within the speci...
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The invention relates to an automatic identification method for similar vector graphics in CAD drawings, which includes collecting source graphics and obtaining multiple graphic feature points in the source graphics; determining the feature value of the source graphics according to the feature point distance of each graphic element in the source graphics , and use it as the characteristic identification of the source graphics; find other primitives with the same characteristic value as the source graphics within the layer range of the source graphics and group them according to the primitive type; then extract the coordinate position from each group in the first A primitive is the center, and the primitives within the size range of the source graph form a new graph; the feature value of the new graph is obtained by calculating the feature point distance between the extracted primitives, and the feature value of the new graph is used as the feature of the new graph The identification is compared with the feature identification of the source graphics; if they are consistent, the new graphics formed are the graphics to be searched; otherwise, the extraction calculation continues until all the primitives in each group are extracted. The above-mentioned solution can automatically recognize the graphic element information in the CAD file, which is convenient to operate and high in recognition efficiency.
Description
technical field [0001] The invention relates to a graphic recognition method, in particular to an automatic recognition method for similar vector graphics in CAD drawings. Background technique [0002] In the field of engineering cost calculation, cost engineers often calculate the recognized graphic information of components in the original drawings by means of human eye recognition and manual statistics. In this way, manual operation of drawings is very inefficient, time-consuming and labor-intensive, and the recognition accuracy is not high. Especially in large-scale drawings, it is not easy to identify and search by human eyes, and most of the components are composed of discrete primitives. When manually selecting component graphics, it is likely to be missed, which will also lead to inaccurate subsequent calculations. . [0003] The general original drawings are based on dwg drawings drawn by two-dimensional CAD software. Since most of the graphics drawn on two-dimen...
Claims
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IPC IPC(8): G06K9/00G06F16/55G06F16/56G06F16/583
CPCG06F16/55G06F16/56G06F16/583G06V30/422
Inventor 陈永宏张超王渊博尹华承
Owner 青矩技术股份有限公司