Retrographic sensing for the measurement of surface texture and shape

We describe a novel device that can be used as a 2.5D "scanner" for acquiring surface texture and shape. The device consists of a slab of clear elastomer covered with a reflective skin. When an object presses on the skin, the skin distorts to take on the shape of the object's surface....

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Bibliographic Details
Published in2009 IEEE Conference on Computer Vision and Pattern Recognition pp. 1070 - 1077
Main Authors Johnson, Micah K, Adelson, Edward H
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2009
Subjects
Cameras
Distortion measurement
Light sources
Lighting
Presses
Shape measurement
Skin
Slabs
Surface reconstruction
Surface texture
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Summary:We describe a novel device that can be used as a 2.5D "scanner" for acquiring surface texture and shape. The device consists of a slab of clear elastomer covered with a reflective skin. When an object presses on the skin, the skin distorts to take on the shape of the object's surface. When viewed from behind (through the elastomer slab), the skin appears as a relief replica of the surface. A camera records an image of this relief, using illumination from red, green, and blue light sources at three different positions. A photometric stereo algorithm that is tailored to the device is then used to reconstruct the surface. There is no problem dealing with transparent or specular materials because the skin supplies its own BRDF. Complete information is recorded in a single frame; therefore we can record video of the changing deformation of the skin, and then generate an animation of the changing surface. Our sensor has no moving parts (other than the elastomer slab), uses inexpensive materials, and can be made into a portable device that can be used "in the field" to record surface shape and texture.
ISBN:1424439922
9781424439928
ISSN:1063-6919
1063-6919
DOI:10.1109/CVPR.2009.5206534