acquisition.slides.printing.2

acquisition.slides.printing.2 - CS 450 I n tro d u c tio n...

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CS 450 : Introduction to Digital Signal and Image Processing Signal and Image Acquisition Acquisition Devices Aperture Scanning Sensor Quantizer Output storage medium
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Apertures Point measurements are impossible Have to make measurements using a (weighted) average over some aperture time window spatial area etc.
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Apertures Size of aperture determines resolution Smaller apertures = better resolution Larger apertures = worse resolution Lenses allow a physically larger aperture to act as an effectively smaller one
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Lenses Sensor Lens Effective Aperture Sensor Converts light (photons) to chemical and/or electrical response Examples Silver halide crystals (film) Photoreceptors in our eyes (rods, cones) Charge-coupled device (CCD), etc.
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Unavoidable random fluctuations from “correct” value Can usually be modeled as a statistical distribution with mean at the “correct” value A measured sample will vary from that mean
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acquisition.slides.printing.2 - CS 450 I n tro d u c tio n...

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