Stereopsis

# Stereopsis - Stereopsis Mark Twain at Pool Table no date...

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Stereopsis

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Mark Twain at Pool Table", no date, UCR Museum of Photography
Woman getting eye exam during immigration procedure at Ellis Island, c. 1905 - 1920   , UCR Museum of Phography

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Why Stereo Vision? 2D images project 3D points into 2D: O O P’=Q’ P’=Q’ P P Q Q 3D Points on the same viewing line have the same 2D  image: 2D imaging results in depth information loss
Stereo Assumes (two) cameras. Known positions. Recover depth.

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Recovering Depth Information: O O 2 P’ P’ 2 =Q’ =Q’ 2 P P Q Q O O 1 P’ P’ 1 Q’ Q’ 1 Depth can be recovered with two images and triangulation.  Depth can be recovered with two images and triangulation.
Finding Correspondences: O O 2 P’ P’ Q’ Q’ 2 P P Q Q O O 1 P’ P’ 1 Q’ Q’ 1

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Finding Correspondences:
3D Reconstruction O O 2 P’ P’ 2 P P O O 1 P’ P’ 1 We must solve the correspondence problem first! We must solve the correspondence problem first!

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Stereo correspondence Determine Pixel Correspondence Pairs of points that correspond to same scene point Epipolar Constraint Reduces correspondence problem to 1D search along conjugate epipolar lines epipolar plane epipolar line epipolar line epipolar line epipolar line (Seitz)
Image planes of cameras are parallel. Focal points are at same height. Focal lengths same.

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## This note was uploaded on 01/13/2012 for the course CMSC 426 taught by Professor Staff during the Winter '08 term at Maryland.

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Stereopsis - Stereopsis Mark Twain at Pool Table no date...

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