MITMAS_531F09_lec03

MITMAS_531F09_lec03 - The Media Lab Camera Culture...

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The Media Lab Camera Culture Improving Film-Like Photography aka, Epsilon Photography Ankit Mohan Courtesy of Ankit Mohan. Used with permission.
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Well-Lit 3D Scene: ‘Pinhole’ Model: Rays copy scene onto ‘film’ Angle( θ , ϕ ) Position (x,y) 2D Sensor: 2D Sensor: Pixel Grid Pixel Grid ‘Center of Center of Projection Projection R a y Film-like Optics: Imaging Intuition Film Film - - like Optics: like Optics: Imaging Intuition Imaging Intuition or Film, or Film, Well-Lit 3D Scene: ‘Pinhole’ Model: Rays copy scene onto ‘film’
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Scene Sensor ‘Pinhole’ Model: Rays copy scene onto ‘film’ Film-like Optics: Imaging Intuition Film Film - - like Optics: like Optics: Imaging Intuition Imaging Intuition Lens ‘Center of Projection’ Angle( θ , ϕ ) R a y Position (x,y) Scene Sensor ‘Pinhole’ Model: Rays copy scene onto ‘film’
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Scene Sensor Lens ‘Center of Projection’ Angle( θ , ϕ ) R a y Not One Ray, but a Bundle of Rays Not One Ray, but Ray, but a a Bundle of Rays of Rays Position (x,y) Scene Sensor
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• (BUT Ray model isn’t perfect : ignores diffraction) • Lens, aperture, and diffraction sets the point-spread-function (PSF) (How? See: Goodman,J.W. ‘An Introduction to Fourier Optics’ 1968) Not One Ray, but a Bundle of Rays Not One Ray, Ray, but a but a Bundle of Rays of Rays Scene Scene Sensor Sensor Aperture Lens Lens • (BUT Ray model isn’t perfect : ignores diffraction) • Lens, aperture, and diffraction sets the point-spread-function (PSF) (How? See: Goodman,J.W. ‘An Introduction to Fourier Optics’ 1968)
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• How do we compute S 1 and S 2 for a lens? • What is the ‘Ray-Bending Strength’ for a lens? Scene Scene Sensor Sensor S S 2 S S 1 Lens Lens Review: Lens Measurements Review: Review: Lens Measurements Lens Measurements • How do we compute S 1 and S 2 for a lens? • What is the ‘Ray-Bending Strength’ for a lens?
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Lens focal length f : where parallel rays converge Review: Focal Length f Review: Review: Focal Length Focal Length f f Lens Lens S 2 = f S S 1 = = Lens focal length f : where parallel rays converge
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Lens focal length f : where parallel rays converge smaller focal length: more ray-bending ability… Review: Focal Length f Review: Review: Focal Length Focal Length f f Lens Lens f S S 1 = = Lens focal length f : where parallel rays converge smaller focal length: more ray-bending ability…
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Lens Lens focal length f : where parallel rays converge greater focal length: less ray-bending ability… For flat glass; for air : f = For flat glass; for air : f = Review: Focal Length f Review: Review: Focal Length Focal Length f f f S S 1 = = Lens Lens focal length f : where parallel rays converge greater focal length: less ray-bending ability…
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Scene Scene Sensor Sensor S S 2 S S 1 Lens Lens f f Review: Thin Lens Law Review: Review: Thin Lens Law Thin Lens Law: Thin Lens Law: in focus when: in focus when: Note that Note that S S 1 1 f f and and S S 2 f f Try it Live! Physlets Try it Live! Physlets http://webphysics.davidson.edu/Applets/Optics/intro.html
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This note was uploaded on 02/07/2012 for the course MAS. 131 taught by Professor Rameshraskar during the Fall '09 term at MIT.

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MITMAS_531F09_lec03 - The Media Lab Camera Culture...

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