Paper Engineering Drawings Managing, Browsing And Modifying System

A great lot of paper engineering drawings are accumulated and generated in many enterprises and scientific research academies along with many years. Paper engineering drawings are accumulations of scientific and technology knowledge, so keeping them appropriately and reusing them are necessary. Computer products information management is the backup foundation. PDM has been attentioned and put into use popularly. Paper engineering drawings are products information and paper engineering drawings management, modification and relevant disposal are studied in this dissertation.Based on the knowledge of objected-oriented method and the basic definition of database, the structural notation of products and its parts is studied, the database and its forms of paper engineering drawings and the framework of the management system are designed. Based on those,the paper engineering drawings management system is built.In this system,a lot of recordset operations are implemented, such as add, delete, update. In the same time, ODBC API and OLE are employed to realize the impletation of query and browse the images. The CAD engineering drawings and paper engineering drawings can be manipulated in this management system.Considered the importance of paper engineering drawings reuse, the paper engineering drawings browsing, red annotation and editing are studied. The editing class is designed, based on this class, editing functions are provided; also the redlining annotation technique is developed which is built on the redlining annotation class which can make people exchange their ideas directly on the drawings and the work efficiency is improved accordingly; the detailed rotation steps are given and the rotating scanning is implemented on the basis of the image rotation technique.Two image manipulation techniques which are about the paper engineering drawings digitalization are studied. The techniques are the algorithm of line thinning and discrimating the wide line between the thin line and their realizations. The parallel algorithm is modified for its slow speed and after modification it can thin the line more quikly without disorting the line.