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3D Photography on your desk Jean-Yves Bouguet and Pietro Perona Department of Electrical Engineering |
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3D Photography on your desk Jean-Yves Bouguet and Pietro Perona Department of Electrical Engineering |
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(VRML and MetaStream format) |
From 2D images...
...to 3D shape...
VRML/Inventor files
(48090 triangles, 734KB gzipped compressed)
Metastream mesh (106KB only!!!) - Download the Metastream player (by Metacreations Corp.) at this location
0.1mm reconstruction noise -> 0.1% error
...using a desk lamp and a pencil!
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Project description:
We are developing a simple and inexpensive method for extracting the three-dimensional shape of objects. It is based on `weak structured lighting'; it differs from other conventional structured lighting approaches in that it requires very little hardware besides the camera: a desk-lamp, a pencil and a checkerboard. The camera faces the object, which is illuminated by the desk-lamp. The user moves a pencil in front of the light source casting a moving shadow on the object. The 3D shape of the object is extracted from the spatial and temporal location of the observed shadow. Experimental results are presented on three different scenes demonstrating that the error in reconstructing the surface is less than 1%.
The camera is facing the scene illuminated by a halogen desk lamp (left). The scene consists of objects on a plane (the desk). When an operator freely moves a stick in front of the lamp (over the desk), a shadow is cast on the scene. The camera acquires a sequence of images as the operator moves the stick so that the shadow scans the entire scene. This constitutes the input data to the 3D reconstruction system. The three dimensional shape of the scene is reconstructed using the spatial and temporal properties of the shadow boundary throughout the input sequence. The right-hand figure shows the necessary equipment besides the camera: a desk lamp, a calibration grid and a pencil for calibration, and a stick for the shadow. One could use the pencil instead of the stick.
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Online Reports:
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