Remote Sensing Systems: the Human Eye Spectral Resolution: 0.4-0.7 µ m Spatial Resolution: ~ 1-3 cm...
Transcript of Remote Sensing Systems: the Human Eye Spectral Resolution: 0.4-0.7 µ m Spatial Resolution: ~ 1-3 cm...
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Remote Sensing Systems:the Human Eye
• Spectral Resolution: 0.4-0.7 µm
• Spatial Resolution: ~ 1-3 cm @ 20 m
• Radiometric Resolution: ~16-32 shades B/W or ~100 colors
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HumanEye
Retina Rods & Cones:
our visible detectors
120 Million rods, 5 Million cones, & 1 million optic
axons
Cones--color sensitive, form sharp images, require many photons
Rods are intensity, but not color sensitive, & form blurred images
Birds--big eyes, more cones, “faster” eye muscles, more support, and best
vision (8x better than ours)
Nocturnal animals have big eyes & more rods/fewer cones
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Our vision is Our vision is optimized for optimized for
receiving the receiving the most most abundant spectral abundant spectral radianceradiance our star our star emits. Evolution?emits. Evolution?
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Human Eye and Retina
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Eye Cross-section, Front, & BackEye Cross-section, Front, & Back
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Human Vision
Visible photons --> electrical charge
Nerve impulses are electro-chemical
Information transmitted to brain for processing
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Human Vision -- could be better
to processorNot optimum design--lots of nerve cells in optical pathway
(give us a few more million years without a major extinction event…)
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The Octopus has a
comparable eye to ours--an example of parallel evolution
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Insect visual simulation at
2-3 m
Albert Einstein Image projected onto compound eye Insect views AE
You be the judge