lec3 - Announcements Image Formation and Cameras Computer...

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CS252A, Fall 2010 Computer Vision I Image Formation and Cameras Computer Vision I CSE 252A Lecture 3 CS252A, Fall 2010 Computer Vision I Announcements • Assignment 0: “ Getting Started with Matlab ” is posted to web page, due Tuesday • Read Forsyth & Ponce chapters 1 & 2 , Richard Szeliski p29-45. CS252A, Fall 2010 Computer Vision I The course • Part 1: The physics of imaging • Part 2: Early vision • Part 3: Reconstruction • Part 4: Recognition CS252A, Fall 2010 Computer Vision I Image Formation: Outline • Factors in producing images • Projection • Perspective/Orthographic Projection • Vanishing points • Projective Geometry • Rigid Transformation and SO(3) •L e n s e s •S e n s o r s • Quantization/Resolution • Illumination • Reflectance and Radiometry CS252A, Fall 2010 Computer Vision I Earliest Surviving Photograph • First photograph on record, “la table service” by Nicephore Niepce in 1822. • Note: First photograph by Niepce was in 1816. CS252A, Fall 2010 Computer Vision I How Cameras Produce Images Basic process: – photons hit a detector – the detector becomes charged – the charge is read out as brightness Sensor types: – CCD (charge-coupled device) • high sensitivity • high power • cannot be individually addressed • blooming –CM O S • simple to fabricate (cheap) • lower sensitivity, lower power • can be individually addressed
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CS252A, Fall 2010 Computer Vision I Images are two-dimensional patterns of brightness values. They are formed by the projection of 3D objects. Figure from US Navy Manual of Basic Optics and Optical Instruments, prepared by Bureau of Naval Personnel. Reprinted by Dover Publications, Inc., 1969. CS252A, Fall 2010 Computer Vision I Effect of Lighting: Monet CS252A, Fall 2010 Computer Vision I Change of Viewpoint: Monet Haystack at Chailly at sunrise (1865) CS252A, Fall 2010 Computer Vision I Pinhole Camera: Perspective projection • Abstract camera model - box with a small hole in it Forsyth&Ponce CS252A, Fall 2010 Computer Vision I http://www.acmi.net.au/AIC/CAMERA_OBSCURA.html (Russell Naughton) Camera Obscura "When images of illuminated objects . .. penetrate through a small hole into a very dark room . .. you will see [on the opposite wall] these objects in their proper form and color, reduced in size ... in a reversed position, owing to the intersection of the rays". Da Vinci CS252A, Fall 2010 Computer Vision I • Used to observe eclipses (e.g., Bacon, 1214-1294) • By artists (e.g., Vermeer). Camera Obscura
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CS252A, Fall 2010 Computer Vision I http://brightbytes.com/cosite/collection2.html (Jack and Beverly Wilgus) Jetty at Margate England, 1898. Camera Obscura CS252A, Fall 2010 Computer Vision I Distant objects are smaller (Forsyth & Ponce) CS252A, Fall 2010 Computer Vision I Purely Geometric View of Perspective The projection of the point P on the image plane Π ’ is given by the point of intersection P ’ of the ray defined by PO the plane Π ’.
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This note was uploaded on 12/08/2010 for the course CSE 252a taught by Professor Staff during the Fall '08 term at UCSD.

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lec3 - Announcements Image Formation and Cameras Computer...

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