Monday, 12 March 2012

Kinect accuracy and precision with RGBDemo

The presentations that impressed me the most during the workshop "Low cost 3D: sensori, algoritmi e applicazioni" (Trento, 8-9 March 2012) were the those of FBK's researchers and especially:  "Tecnologia TOF per 3D imaging – low-cost o no?" (L. Gasparini, D. Stoppa) and "Caratterizzazione di sensori attivi e passivi low-cost" (F. Menna). One of the topic of these contributes was Kinect and the level of detail,  accuracy and precision this instrument can reach. In particular it was said that using Kinect with a distance of 50 cm it is possible to record 3D scenes with an error of more or less 2 mm.
Alessandro and me already tested Kinect in ArcheOS (on Ale's laptop) during our teaching experience in Lund University, but in that occasion we did not check the level of accuracy. For this reason Alessandro compiled RGBDemo on my laptop during the workshop and, thanks to the coffee break, we tested it with some researchers reaching an accuracy of 1 mm.  
This evening I repeated the experiment at home and here is the video of RGBDemo Reconstructor during data acquisition:


The yellow square you see in the movie is a normal folding meter and its side is 20 cm long. Here is a more detailed picture of it:


In this other movie I checked the accuracy I reached within MeshLab. When I measured the side of the squared the result was 0.198 m (better seen in full screen...).


I think this level of accuracy is more then enough for archaeological applications. Anyway I will go on with other test in the next months, hopefully with something more professional than my living-room :). 
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