acquisition.slides.printing.6

acquisition.slides.printing.6 - Acquisition Devices CS 450...

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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 Apertures Point measurements are impossible Have to make measurements using a (weighted) average over some aperture time window spatial area etc. 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. Noise 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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This document was uploaded on 03/15/2012.

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acquisition.slides.printing.6 - Acquisition Devices CS 450...

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