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Computer Digital Image Processing in Quality Inspection- Reverse Engineering Approach

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2011 ASEE Annual Conference & Exposition


Vancouver, BC

Publication Date

June 26, 2011

Start Date

June 26, 2011

End Date

June 29, 2011



Conference Session

ETD Design II: Mechanical Engineering Technology

Tagged Division

Engineering Technology

Page Count


Page Numbers

22.362.1 - 22.362.9



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Paper Authors


Akbar M. Eslami Elizabeth City State University

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Dr. Akbar Eslami is a professor and Engineering Technology coordinator in the Department of Technology at Elizabeth City State University. He received his Ph.D. in Mechanical Engineering from Old Dominion University. His research interests are in computer aided manufacturing and design, Finite Element Analysis, and automation.

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IT/IET Interest Group Computer Digital Image Processing in Quality Inspection- Reverse Engineering ApproachThe objective of this paper is to implement a reverse engineering process to improve theperformance of a flow meter rim rotor. The process includes utilizing a laser scanner arm andGeomagic software to generate a 3D computer model of the flow meter rim rotor and compare itwith original Computer Aided Drafting (CAD) model to check for any discrepancies and makerecommendations to improve the performance. In this project, the laser scanner and Geomagicsoftware create a 3D computer model of an existing part and turns it into a CAD model which isused as the basic model to analyze and optimize the part. The process converts low-levelgeometric information generally represented by point cloud positions and their differentialgeometric attributes to high-level information, such as design methods, functional principles, andengineering constraints.This concept is getting very popular in industries and military that use computer digital imageprocessing technique in reverse engineering method to redesign and improve the efficiency ofthe existing part as well as in production development. Using the scanner is a typical way togenerate 3D computer models of actual parts that will be manufactured. First, the user utilizesthe scanner arm to scan and register the points on the part and the scanner sends the registeredpoints to Geomagic Studio software to generate a 3D computer model. Once the part is modeled,it can be sent to a rapid prototyping machine to prototype the part. Another application of reverseengineering is in inspection process and quality control. In this case, the scanned computer-generated model will be merged and compared to the original CAD model in order to check thespecifications of the product prior to starting the manufacturing of the part.The traditional method was to utilize a coordinate measuring machine (CMM) to collect data andregistered them. The CMM, which has a probe, must physically touch the part. However, if thepart has complex geometry, it takes couple months to registered millions of points. The samecomputer model can be generated by utilizing the non- contact optical scanner and software in acouple days.

Eslami, A. M. (2011, June), Computer Digital Image Processing in Quality Inspection- Reverse Engineering Approach Paper presented at 2011 ASEE Annual Conference & Exposition, Vancouver, BC. 10.18260/1-2--17643

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