Retrographic Sensing for the Measurement of Su urface Texture and Sha ape ape Micah K Johnson Edward H Adelson MIT October 9 2009 Capturing geometry Woodham 1980 Zickler 2002 Goldman 2005 Hertzmann Hertzmann 2005 Im mages removed due to copyright restrictions Se ee 1 Fig 10 baby doll head in Zickler T et al International Journal of Computer Vision 49 no 2 3 2002 215 PDF 2 Fig 1 cast iron teapot in Goldman D B et al Proc Of ICCV 2005 PDF 3 Ceramic cat from Hertzmann A and S Seitz Shape and Materials by Example A Photometric Stereo Approach Approach IEEE PAMI 27 27 no no 8 2005 2005 Surface texture and shape Cookie Paint Cl Clear El Elasttomer Elasto omers omers Material M t i l sh hould ld b be clear soft durable etc t Have tried silicones and polyurethanes Thermoplastic elastomers TPEs See accompanying video Thermoplastic Thermoplastic elastomers lec05 tpe mov Bake at 350 for 30 minutes Pa aint Lights cam mera action mera Sensor Lig ghts Cam mera Why thre ee lights ee lights Shape from shadinng shading SF FS FS shape Multiple lightss s photometric stereo Woodham 1980 RGB Red Green Blue Calibrration Lookup Table B G R RGB color Lookup Lookup Gradient 10 200 3 0 0 3 200 10 3 0 2 0 2 S rface reccconstruction Surface onstr ction See accompanying video 20 dollar bill lec05 20 mov See accompan S nyiing video id Fingertip lec05 finger mov See accom S mpanyiing video id Fingertip with lotio on lec05 finger2 mov Limita ations ations Limited depth deppends on gel Some objects distoort ort when pressed fingertips cloth Retrograph hic sensing hic Inexpensive High resolution Simple Portable Interactivve Acknowledgementss Funding from NSSF SF and Adobe Systems MIT OpenCourseWare http ocw mit edu MAS 531 Computational Camera and Photography Fall 2009 For information about citing these materials or our Terms of Use visit http ocw mit edu terms