Lec4 - IEG 4190 Lecture Notes 4; Lecturer: Jianzhuang Liu...

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1 IEG 4190 Lecture Notes 4; Lecturer: Jianzhuang Liu Outline: 1. Light 2. Color 3. Human Visual System
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2 Light Energy density of electromagnetic wave: ) , , , ( λ t y x c , m m joules sec / 2 Light is the visible part of the spectrum Ultraviolet Infrared
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3 Light, cont’d At a specific x, y, t, Physical Domain very approximate Perceptual Domain max min ) ( ) ( λ d s c B r i g h t n e s s center H u e w S a t u r a t i o n
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4 Light, cont’d Relative luminous efficiency function: () ( ) / ' tr t cc ν λλ λ = nm r 555 = , yellow-green light (max brightness sensitivity) A monochromatic light: a light Consists of only one r t
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5 Light, cont’d For black and white images = = 0 ) ( ) ( λ d s c k I BW I : intensity, luminance, gray level, usually scaled to 0 – 255. ) ( BW s : C.I.E. relative luminous efficiency function, measuring the spectral characteristics of the sensor. C.I.E. (Commission Internationale de l’Eclairage): international body concerned with standards for light and color.
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6 Color Three primary colors (a set of tristimulus values): Red component:
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Lec4 - IEG 4190 Lecture Notes 4; Lecturer: Jianzhuang Liu...

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