02. Foundations - 2011

02. Foundations - 2011 - ECE 638 Principles of Digital...

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ECE 638: Principles of Digital Color Imaging Systems Lecture 2: Foundations of Color Science
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Synopsis Briefly trace development of our knowledge of color and vision; so that we can “discover” it in a logical manner. Explore concepts of color matching that form basis for trichromatic theory of color and colorimetry Develop mathematical framework for trichromatic theory
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Early concepts of vision Anatomy of eye Emanation theory Pinhole camera The lens Spectrum of white light Trichromacy Source: Robert M. Boynton, Human Color Vision , Optical Society of America, 1992, pp. 1-18
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Anatomy of the human eye Early Greeks practiced dissection
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Emanation theory Empedocles (5th century BC) – the “eye is like a lantern” Galen (130-200 AD) physiologist the brain is “an organ where all sensations arrive, and where all mental images, and all intelligent ideas arise. rays are discharged in the direction of the object, interact with the object, and return to the eye His views remained influential for about 1500 years
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Pinhole camera Abu Ali Mohammed Ibn Al Hazen (965 - 1039 AD) Experimented with simple pinhole camera Concluded that eye contained an “image” with a point-to-point correspondence with scene under observation Leonardo da Vinci (1452 - 1519) Developed notions of perspective Proposed ray tracing Hampered by hypothesis that image within eye must be right- side up
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The lens Spectacles discovered by 1285 Used to improve pinhole camera by G. B. Della Porta in 1589 Johannes Kepler Astronomer Constructed and understood lenses Concluded that image within eye formed on retina Aranzi cut a hole in back of animal’s eye to observe retinal image in 1595
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Spectrum of white light Newton’s experiment with prism (1730) Concluded that white light is a mixture of colored lights Removed color from perceived object and placed it in rays reflected from the object
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Trichromacy Color mixtures Artisans and scientists experimented with them from ancient times Are properties due to materials or due to perception?
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