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Imageformation2 - Image formation 2 Blur circle Points a t...

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Image formation 2
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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
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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
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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. Brightness corresponds roughly to radiance light surface
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Solid angle The solid angle subtended by a cone of rays is the area of a unit sphere (centered at the cone origin) intersected by the cone A hemisphere cover 2 π sterradians
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