The Research Of Computer Recognition Technology For Plate-like Part Drawing

In the Visual C++ programming environment, useing ObjectARX which is one development kit of AutoCAD, covering a kind of detail drawing take the Plate-like Parts as the key research objects, some important technologies of the Correcting of Mechanical Part Drawing software are analysed. And corresponding algorithms are proposed.In the algorithm design, the main standard is the reference answer drawing which is provided in advance, meanwhile the national Mechanical drawing standard must be Observed. The procedure takes inspecting the typical mistake as the primary mission, at the same time it has the certain tolerance and the intelligence.The paper introduces the graph pretreatment, the region division, the view recognition, the graph comparison and other auxiliary modules separately according to the system work flow. In the graph pretreatment, the line width and the line style are carried on inspection processing, the decomposition processing to the complex entity like rectangle is carried on inspection processing, the merge processing to the superposition entity and the merge processing to those points which have little distance are carried on too. The paper proposes two kinds of methods dividing AutoCAD graph for mechanical part drawings based on ObjectARX: The graph region division based on entities 'minimum exterior rectangle fusion, the graph region division based on scanning beam. newly one kind based on the entity intersection characteristic graph region division method is proposed which fit the basis actual vector graph characteristic. In the view recognition, the paper covers the kind of detail drawing unique feature according to the plate-like part drawing, carries on the front view, the left view and other views recognition matches, and elaborates the recognition methods of the revolving cutaway view which is very important view expression way. In the graph comparison module, the processing method has carried on the detailed discussion include the point, the straight line, the circle, the arc, the character, the dimension , the hatch and the roughness. In the auxiliary module,mainly three partial contents are included in the paper: The result show, the interfacial design and the procedure installment packs processing. As the different of users' goal, the result is showed by two ways that are graphic mode and the text mode. The graphic mode mainly aims at the student. The text mode mainly aims at the teacher. The procedure' interfacial design takes the easy to operate, succinct and artistic surface as the principle, which includes the procedure ' surface design running in operation system and the menu designs in AutuCAD two parts. Meanwhile the ARX procedure autoloading method is carried on the narration. In the processing of pack and installment , InstallShield which is the tool for procedure package is introduced. Then the methods to modify the system registry and to organize the installment documents are carried on the detailed elaboration.Finally the whole process is demonstrated in paper indues the entire software installment, running and correcting drawings. Then it produced some examples to confirm the accuracy, the rationality and the compatibility of algorithms.