OPTI 201R 10 L7

OPTI 201R 10 L7 - 7-1 Chapter 3 Image Formation An...

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OPTI 201R Fall 2010 7-1 Chapter 3: Image Formation “An image….refers to the formation of a light pattern to replicate a scene. The light (radiant power) pattern formed by the optical phenomenon resembles the scene or object, and is called an image.” GTO pg. 49 “An image is a 2-dimensional pattern of light that is formed when there is a one-to-one linear mapping (correspondence) between any given point in an object and its corresponding point in the (x-y) image plane.” Nofziger ! Not all 2-dimensional patterns of light are images! ! “in-focus” pattern of light (in a camera) vs… ! “out-of-focus” pattern of light (in a camera) ! Images are 2-dimensional: ! 2-dimensional object ! a 2-dimensional image ! 3-dimensional object ! a 2-dimensional image ! Therefore, film and CCD chips are 2-dimensional devices that record a 2-dimensional pattern of light. Webster.com says…. Image : Middle English, from Anglo-French, short for imagene, from Latin imagin-, imago imitation, copy ; perhaps akin to Latin imitari to imitate 2 a : the optical counterpart of an object produced by an optical device (as a lens or mirror) or an electronic device b : a visual representation of something: as (1) : a likeness of an object produced on a photographic material (2) : a picture produced on an electronic display (as a television or computer screen)
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OPTI 201R Fall 2010 7-2 3.1 The Pinhole Camera (Reference: Seeing the Light: Optics in Nature, Photography, Color, Vision, and Holography) by David R. Falk, Dieter R. Brill, David G. Stork) Figure 3.1 Pinhole camera. ! The simplest imaging device known. ! Consists of a relatively large obstacle with a tiny 'pinhole' opening in it. ! Relies on, and in fact is proof of the concept, that light travels in straight lines. ! Also known as a 'camera obscura' or 'dark room'. * NOTE : The term 'camera obscura' is usually associated with devices that use a lens instead of a pinhole, but no film--when film is used, we call it a camera!
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OPTI 201R Fall 2010 7-3 History of the Pinhole Camera: 5th century BC ! First mentioned by the Chinese philospher Mo-Ti -- he formally recorded the inverted image formed by light rays passing through a pinhole into a darkened room -- he called this room a "collecting place" or the "locked treasure room"
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OPTI 201R 10 L7 - 7-1 Chapter 3 Image Formation An...

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