Faculty: A. Ardeshir Goshtasby
Students: David Holtkamp, Lyubomir Zagorchev
A laser range scanner is being developed that can acquire different-view images of an object and combine the images without image registration. By sweeping a laser line generator over an object just like painting with a paintbrush, the user captures a range image of the object. By appropriately adjusting the speed at which the laser is swept over the object, the user can capture dense data in areas where high details are required and sparse data in areas where coarse data are sufficient. The scanner maps scene texture to the reconstructed scene geometry, recovering a scene's both geometry and texture.
Presented below are results from two versions of the paintbrush scanner. Results from a smaller scanner are shown first, and results from a larger scanner to a person's whole body are shown next.
Experimental results
1. Range data obtained from a single view
In this example, the camera was fixed, but the laser was swept manually over the object twice, from left and right.
Fig. 1. Range data obtained when scanning the object from the left.
Fig. 2. Range data obtained when scanning the object from the right.
Fig. 3. Combined range data.
Fig. 4. NURBS surface fitted to the combined range data.
Fig. 5. Reconstructed face represented with a texture mapped NURBS surface.
2. Range data obtained from two different views and integrated without image registration
In this example, a Greek statue was scanned from two different positions of the camera, and the obtained range data were integrated without image registration.
Fig. 6. Range data obtained from the first scan.
Fig. 7. Range data obtained from the second scan.
Fig. 8. Integrated range data.
Fig. 9. NURBS surface fitted to the combined range data.
Fig. 10. Reconstructed statue represented by a texture mapped NURBS surface.
3. A whole-body range scanner
A whole-body range scanner has been developed based on the paintbrush concept. To minimize user interaction, four laser lines sweep over the body of a person in sequence and three cameras record the intersections of the laser planes with the body. The laser and the cameras are computer controlled and the entire system is run off of a laptop computer. So, the system is very portable. Moreover, calibration of the system is very simple and taken only a few minutes. The cameras and the laser are approximately placed in the scene with respect to a frame inside which the person to be scanned stands. Calibration is done with software with minor user interaction and in a few minutes. Black and white cameras are used to achieve a higher range resolution. The scanner set up is shown in Fig. 11. Figs. 12a and 12b show the captured surround range data in shaded form and in in its original intensity form. Range data captured from the three cameras are combined automatically without image registration.Fig. 13 shows tools developed within the scanner software to calculate different measurements from the scanned body for tailoring purposes.
Fig. 11. The interface of the whole-body scanner.
(a) (b)
Fig. 12. An example scan shown (a) in shaded form and (b) in its original intensities when viewed from different cameras.
Fig. 13. Measurement tools measuring different dimensions of the scanned body.
For more information please contact Ardy Goshtasby or Norm King.
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