lecture9 - EECS 442 Computer vision Shape from reflections...

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EECS 442 – Computer vision Shape from reflections Special topic
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Visual cues: texture shading contours shadows Recovering the shape of an object A taxonom y
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Recovering the shape of an object A taxonom y Visual cues: texture shading contours shadows
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Recovering the shape of an object A taxonom y Visual cues: texture shading contours shadows
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Recovering the shape of an object Visual cues: texture shading contours shadows A taxonom y
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Number of observers: monocular multiple views Recovering the shape of an object camera A taxonom y Visual cues: texture shading contours shadows
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Number of observers: monocular multiple views Recovering the shape of an object camera 1 camera 2 camera N A taxonom y Visual cues: texture shading contours shadows
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Active lighting: laser stripes structured lighting patterns shadows Number of observers: monocular multiple views Recovering the shape of an object camera Laser/projector/light A taxonom y Visual cues: texture shading contours shadows
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Visual cues: texture shading contours Number of observers: monocular multiple views Active lighting: laser stripes structured lighting patterns shadows Recovering the shape of an object A taxonom y Limitation: Assumptions on surface reflectance function Specular Transparent
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Non Lambertian surfaces Lambertian surfaces
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Visual cues: texture shading contours Number of observers: monocular multiple views Active lighting: laser stripes structured lighting patterns shadows Recovering the shape of an object A taxonom y Limitation: Assumptions on surface reflectance function Specular Transparent
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Visual cues: texture shading contours Number of observers: monocular multiple views Active lighting: laser stripes structured lighting patterns shadows Limitations • No intrinsic surface features: textures – shading… • No clear contours Recovering the shape of an object
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Visual cues: texture shading contours Number of observers: monocular multiple views Stereo matching algorithms fail! Active lighting: laser stripes structured lighting patterns shadows Limitations • Epipolar geometry doesn’t work Recovering the shape of an object
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Visual cues: texture shading contours Number of observers: monocular multiple views Active lighting: laser stripes structured lighting patterns shadows Limitations R e f l ect i o n s a r u c ! Recovering the shape of an object
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A new perspective Use specular reflections as additional visual cue Johann Erdmann Hummel -- The Granite Bowl in the Berlin Lustgarten [1831] to estimate the surface’s shape Savarese, et al. CVPR 01, IJCV 07
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E-commerce Digital archival Diagnostic of space structures Industrial metrology Remote sensing of liquid surfaces Digital models of anatomical parts Applications
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M.C. Escher - Still Life with Spherical Mirror (1934) A new perspective Recover local shape of mirror surface by measuring the deformation of a reflected scene
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Scene Mirror surface Image A new perspective
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This note was uploaded on 10/26/2010 for the course EECS 442 taught by Professor Savarese during the Fall '09 term at University of Michigan.

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lecture9 - EECS 442 Computer vision Shape from reflections...

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