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Remote Sensing Systems: the Human Eye

Remote Sensing Systems: the Human Eye. Spectral Resolution: 0.4-0.7 µ m Spatial Resolution: ~ 1-3 cm @ 20 m Radiometric Resolution: ~16-32 shades B/W or ~100 colors. 120 Million rods, 5 Million cones, & 1 million optic axons

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Remote Sensing Systems: the Human Eye

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  1. 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

  2. 120 Million rods, 5 Million cones, & 1 million optic axons Cones--color sensitive, form sharp images, require many photons Rodsare 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 HumanEye Retina Rods & Cones: our visible detectors

  3. Our vision is optimized for receiving the most abundant spectral radiance our star emits. Evolution?

  4. Human Eye and Retina

  5. Eye Cross-section, Front, & Back

  6. Human Vision Visible photons --> electrical charge Nerve impulses are electro-chemical Information transmitted to brain for processing

  7. Human Vision -- could be better to processor Not optimum design--lots of nerve cells in optical pathway (give us a few more million years without a major extinction event…)

  8. The Octopus has a comparable eye to ours--an example of parallel evolution

  9. Insect visual simulation at 2-3 m You be the judge Image projected onto compound eye Albert Einstein Insect views AE

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