Imageformation2

Imageformation2 - Image formation 2 Blur circle A point at...

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Unformatted text preview: Image formation 2 Blur circle A point at distance z- is imaged at point ' z from the lens f z z 1 1 ' 1 =- + and so ) ( ) ( ) ( ' ' z z f z f f z f z z- + + =- | ' ' | ' z z z d b- = Points a t distance are brought into focus at distance z- ' z Thus points at distance will give rise to a blur circle of diameter z- with d the diameter of the lens-z z’-z z’ P P’ Q Q’ d b Irradiance, E • Light power per unit area (watts per square meter) incident on a surface. • If surface tilts away from light, same amount of light strikes bigger surface (less irradiance) (no foreshortening) • E times pixel area times exposure time -> pixel intensity light surface Radiance, L • Amount of light radiated from a surface into a given solid angle per unit area (watts per square meter per steradian). • Note: the area is the foreshortened area, as seen from the direction that the light is being emitted....
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This note was uploaded on 01/13/2012 for the course CMSC 426 taught by Professor Staff during the Winter '08 term at Maryland.

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Imageformation2 - Image formation 2 Blur circle A point at...

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