Development of Fast and Low Cost vision-Based 3D Scanner for Surface Registration of 3d Shapes
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Date
2011
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Uva Wellassa University of Srilanka
Abstract
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A 3D scanner is a device that inspects three dimensional objects to collect data on its shape and possibly its appearance .The collected data can then be used to re-engineer, three dimensional models useful for wide variety of applications. Unlike conventional 2D scanners used in office environment which can only scan plane objects like images on paper, these devices are used extensively by the entertainment industry in the production of movies and video games. Other common applications of this technology include industrial design, orthotics and prosthetics, reverse engineering and prototyping, quality control/inspection and documentation of cultural artifacts.
3D scanning technology can be used to produce highly value added products in existing local industries. Potential uses of 3D scanning technology in the Sri Lankan industries are endless.
Reconstruct replicas of precious artifacts, national monuments are possible applications. These replicated models have higher demand in local and international markets.
Another application area is the garment industry. The 3D scanner enables us to examine the human body in ways never before possible, including the shape of a cross section, slice area, surface area, and volume. This not only makes the body measurement process much more convenient for the customer, it also estimates the need for changing rooms. This technology can be used to manufacture custom stitched highly value added garments for international markets.
3D scanning can also be used in quality control and inspection. It can precisely analyze the "as built" condition of parts after they have been manufactured. Typically, non- contact technology is used to quickly inspect the overall shape and size of parts, quickly detecting issues such as overall scale issues. 3D scanners existing in the market are in the range $100k to $400k.
In our previous research (Ranasinghe et al., 2010) we developed a scanner projecting laser beam onto the object and capturing video sequence while rotating the platform via a stepper motor. Recorded video sequence is then processed to construct the 3D shape of the object. Main limitation of this project's outcome was that scanning process took more than 3 minutes to complete, dimensions of the object were not recorded and image processing and surface construction was done off-line. In the present research, we further developed the existing system in order to overcome these limitations. We introduced a spiral shaped platform that replaced the circular platform. Since the radius of the used spiral shaped platform changes as a function of rotation angle we were able to record the rotational angle real time by image processing the video. Also the known dimensions of the spiral shaped platform are used to calibrate the dimensions of the scanning object. Introduction of the spiral shaped platform reduced the scanning time considerably and allowed recording the dimension of the objects real-time.
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Keywords
Computer Science, Computing and Information Science, Engineering