# 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 Ρ Σ ΢ Τ Φ Υ B = B 11 B 12 B 21 B 22 Ρ Σ ΢ Τ Φ 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 Λ Ν Μ Μ Μ Ξ Π Ο Ο Ο = Transformation representing intrinsic parameters Λ Ν Μ Μ Μ Ξ Π Ο Ο Ο 1 0 0 0 0 1 0 0 0 0 1 0 Λ Ν Μ Μ Μ Ξ Π Ο Ο Ο Transformation representing extrinsic parameters Λ Ν Μ Μ Μ Ξ Π Ο Ο Ο X Y Z T Λ Ν Μ Μ Μ Μ Ξ Π Ο Ο Ο Ο 3 x 3 4 x 4

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CSE152, Spring 2011 Intro. Computer Vision Thin Lens: Image Plane O F P P’ Image Plane Q’ Q A price: Whereas the image of P is in focus, the image of Q isn’t.
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## This note was uploaded on 08/05/2011 for the course CSE 152 taught by Professor Staff during the Spring '08 term at UCSD.

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

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