Visual Systems for Night Vision
The formation and detection of images at low light levels depend on the quantum nature of light. For example, in human vision the eye collects a certain number of photons per second which emanate from an object in proportion to its radiance and area. An image is detected as a result of the absorption of photons by the retina of the eye. The number of photons absorbed by the elements of the retina per integration time of the eye varies with the brightness of the image elements, the rate being greater for bright elements and lesser for dark ones.
KeywordsVisual Perception Test Pattern Retinal Image Dark Adaptation Modulation Transfer Function
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