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# lec4 - Human Visual System Introduction to Computer Vision...

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CSE152, Spring 2011 Intro. Computer Vision Human Visual System Introduction to Computer Vision CSE 152 Lecture 4

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CSE152, Spring 2011 Intro. Computer Vision Announcements Lectures to remain in this room. Discussion section: Wed 1:00-1:50, WLH 2204 HW0 due today HW1 will be posted shortly
CSE152, Spring 2011 Intro. Computer Vision Coordinate Changes: Rigid Transformations

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CSE152, Spring 2011 Intro. Computer Vision Block Matrix Multiplication Given A = A 11 A 12 A 21 A 22 Ρਟ Σਿ ΢ਯ Τ੏ Φ੯ Υ੟ B = B 11 B 12 B 21 B 22 Ρਟ Σਿ ΢ਯ Τ੏ Φ੯ Υ੟ What is AB ? Homogeneous Representation of Rigid Transformations Transformation represented by 4 by 4 Matrix
CSE152, Spring 2011 Intro. Computer Vision Camera parameters • Issue – camera may not be at the origin, looking down the z-axis extrinsic parameters (Rigid Transformation) – one unit in camera coordinates may not be the same as one unit in world coordinates intrinsic parameters - focal length, principal point, aspect ratio, angle between axes, etc. U V W Λি Νয় Μ৏ Μ৏ Μ৏ Ξ৯ Πਏ Ο৿ Ο৿ Ο৿ = Transformation representing intrinsic parameters Λি Νয় Μ৏ Μ৏ Μ৏ Ξ৯ Πਏ Ο৿ Ο৿ Ο৿ 1 0 0 0 0 1 0 0 0 0 1 0 Λি Νয় Μ৏ Μ৏ Μ৏ Ξ৯ Πਏ Ο৿ Ο৿ Ο৿ Transformation representing extrinsic parameters Λি Νয় Μ৏ Μ৏ Μ৏ Ξ৯ Πਏ Ο৿ Ο৿ Ο৿ X Y Z T Λি Νয় Μ৏ Μ৏ Μ৏ Μ৏ Ξ৯ Πਏ Ο৿ Ο৿

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