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Imageformation2

# 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
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
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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