Video Processing

In: Science

Submitted By amrishsoni
Words 4501
Pages 19
Basics of Video

Yao Wang
Polytechnic University, Brooklyn, NY11201


Color perception and specification
Video capture and display
Analog raster video
Analog TV systems
Digital video

© Yao Wang, 2004

Video Basics

Color Perception and Specification

Light -> color perception
Human perception of color
Type of light sources
Trichromatic color mixing theory
Specification of color
– Tristimulus representation
– Luminance/Chrominance representation

• Color coordinate conversion

© Yao Wang, 2004

Video Basics


Light is part of the EM wave

from [Gonzalez02]

© Yao Wang, 2004

Video Basics


Illuminating and Reflecting Light
• Illuminating sources:
– emit light (e.g. the sun, light bulb, TV monitors)
– perceived color depends on the emitted freq.
– follows additive rule
• R+G+B=White

• Reflecting sources:
– reflect an incoming light (e.g. the color dye, matte surface,
– perceived color depends on reflected freq (=emitted freqabsorbed freq.)
– follows subtractive rule
• R+G+B=Black
© Yao Wang, 2004

Video Basics


Eye Anatomy

© Yao Wang, 2004

Video Basics


Eye vs. Camera

Camera components

Eye components


Lens, cornea


Iris, pupil



Cable to transfer images

Optic nerve send the info to the brain

© Yao Wang, 2004

Video Basics


Human Perception of Color

Retina contains photo receptors
– Cones: day vision, can perceive color
• Red, green, and blue cones
• Different cones have different frequency
• Tri-receptor theory of color vision

– Rods: night vision, perceive brightness

Color sensation is characterized…...

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