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It also discusses low- and intermediate-level tools like vectorization and arc recognition, syntactic tasks such as annotation and dimensioning recognition, and functional analysis across views. 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Publishing Company,1996  \nCHAPTER 19  \nINTERPRETATION OF ENGINEERING DRAWINGS  \nKARL TOMBRE  \nINRIA Lorraine &CRIN/CNRS,Batiment LORIA,615rue du jardin botanique54602 Villers-lès-Nancy CEDEX,France  \nand  \nDOV DORI  \nFaculty of Industrial Engineering and Management,TechnionHaifa 32000,Israel  \nTechnical documents are documents of some science or engineering domain,in whichgraphics provide the basis for the information conveyed by the document.Engineeringdrawings in general and mechanical engineering drawings in particular are a typical exam-ple.The interpretation of such drawings entails converting them into some kind of CADrepresentation,which has a high-level meaning,including 3D structure.In this chapter,wereview the different methods and techniques used to achieve this goal,which is still an ac-tive research topic.After presenting the general framework in which such a system mustwork,we introduce the three levels of interpretation:lexical,syntactic and semantic.Wegive anoverviewof the low-and intermediate-leveltools usedin this context:vectorization,recognition of arcs,hatching and dashed lines,etc.At the syntactic level,we describe thetask of recognizing annotations in generaland dimensioning in particular.We also elaborateon the functional analysis that is possible on each view.Finally,we describe the availabletechniques and the open problems for 3D reconstruction from several views.  \nKeywords:engineering drawings interpretation,vectorization,raster-to-vector,dimension-ing,annotations,CAD,lexical analysis,syntactic analysis,functional analysis,3D recon-struction.  \n# 1.Needs and Motivations\n\n## 1.1.General context\n\nAn enginering drawing is a graphic product definition.Prior to the introduction ofCAD/CAM systems,an engineering paper drawing model was the major means of design;numerous mechanical engineering drawings of operational products still exist only in thisform,and are needed for maintenance ofexisting systems and/or as a basis for designing thenext generation of the product the model of which they describe.Paper drawings resultingfrom subcontractors'CAD systems which are not used by the organization that ordered  \n# 2 Handbook on Optical Character Recognition and Document Image Analysis\n\nthem are also very common.  \nAutomated understanding of engineering drawings within a project design and docu-mentation environment provides for the possibility of converting both paper and electronicdrawings into a CAD representation.Engineering drawings are the main means of commu-nication among professionals involved in the project execution process.An object-orientedanalysis of the design and documentation system,based on a large scale project case study,underlines the central role played by drawings and the duality of paper and electronic engi-neering drawings [1].  \nIn CAD representations,some meaning is originally attached to each graphic primitive;thus they can be directly used for CAM.On the other hand,to be meaningful,drawings inboth paper and electronic media must be corectly interpreted by a professional or an intel-ligent system.Drawing interpretation is proposed to eliminate most of the tedious humanlabor associated with digitizing and assigning meaning to drawings.If a paper drawing is tobe converted into CAD,a total rework of the existing design must be carried out.Althoughcommercial products in this field alleviate the burden of low level processing,such as vec-torization,this is still a time-consuming,error-prone and unproductive process,which nev-ertheless requires skilled personnel.Since this interactive,human-intensive labor can onlybe done by costly trained professionals,it is frequently avoided and is done very selectively.This,in effect,amounts toignoring many valuable design man-years put on paper of already\"debugged\"products.  \nAs pointed out in [2],in many cases,stores of paper draw","cbCaisUhUDLcnf8q","https://ap.wps.com/l/cbCaisUhUDLcnf8q","pdf",7475836,28,"English","# 1. Needs and Motivations\n## 1.1. General context\n# 2. Handbook on Optical Character Recognition and Document Image Analysis","[{\"question\":\"What is the primary goal of interpreting engineering drawings in this chapter?\",\"answer\":\"To convert engineering drawings (paper or electronic) into CAD representations with high-level meaning, including 3D structure.\"},{\"question\":\"What are the three levels of interpretation introduced?\",\"answer\":\"Lexical, syntactic, and semantic interpretation, from low-level extraction up to higher-level understanding.\"},{\"question\":\"Which techniques are mentioned for early-stage processing and recognition?\",\"answer\":\"Low- and intermediate-level tools such as vectorization, recognition of arcs, and identification of hatching and dashed lines.\"}]","INTERPRETATION OF ENGINEERING DRAWINGS - CHAPTER 19 - review of OCR and document image analysis methods | PDF",1792792476,71]