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Unformatted text preview: 1 CSE152, Spr 2010 Intro Computer Vision Image Formation and Cameras Introduction to Computer Vision CSE 152 Lecture 2 CSE152, Spr 2010 Intro Computer Vision Announcements • Assignment 0: due Thursday 4/7 • Office Hour: Tuesdays 1:30-2:30 • Read Trucco & Verri: pp. 15-40 • Room will almost certainly change. Location TBD. CSE152, Spr 2010 Intro Computer Vision Image Formation: Outline • Factors in producing images • Projection • Perspective • Vanishing points • Orthographic • Lenses • Sensors • Quantization/Resolution • Illumination • Reflectance CSE152, Spr 2010 Intro Computer Vision Earliest Surviving Photograph • First photograph on record, “la table service” by Nicephore Niepce in 1822. • Note: First photograph by Niepce was in 1816. CSE152, Spr 2010 Intro Computer Vision 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 – CMOS • most common • simple to fabricate (cheap) • lower sensitivity, lower power • can be individually addressed CSE152, Spr 2010 Intro Computer Vision 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. 2 CSE152, Spr 2010 Intro Computer Vision Effect of Lighting: Monet CSE152, Spr 2010 Intro Computer Vision Change of Viewpoint: Monet Haystack at Chailly at Sunrise (1865) CSE152, Spr 2010 Intro Computer Vision Pinhole Camera: Perspective projection • Abstract camera model - box with a small hole in it Forsyth&Ponce CSE152, Spr 2010 Intro Computer Vision 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 "When images of illuminated objects ....
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- Spring '08
- The Land, SPR, Projective geometry, Nicephore Niepce