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Sampling device

Discussion in 'General Electronics Discussion' started by jasonben, Aug 10, 2009.

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  1. jasonben


    Jul 15, 2009
    cradlemess’s post about a camera got me to thinking. I’ve heard of sampling methods before – and how they can be random or organized in different ways. Is there a time-lapse photography method that involves sampling different areas in a field of vision at different time intervals – perhaps to save memory? What would an algorithm used by such a camera consider?
  2. Resqueline


    Jul 31, 2009
    Some video compression algorithms (mpeg4?) does just that; record one full scene, and then just the movements (the pixels that are changing state) for a while. This limits the bandwidth needed for transmission. You can sometimes see the effect of a too narrow bandwidth (or too high compression) when there's a lot of movement filling the picture (like rushing water). Then there appears square blocks similar to what you see when you try to save a jpg picture with too high compression.
  3. jasonben


    Jul 15, 2009
    So that algorithm is based on some kind of rate of change of groups of data that are spacially coordinated. I just looked up memory on the computer. It was related to how information - which could be images, was categorized, how distinct it was, how much energy was required to capture the image, and how much the information - which could be an image, was related to its environment. Or, something like that. I had looked up the extrastriate cortex - and learned that there were many ways of categorizing visual data. I imagine that there is equipment that utilizes algorithms related to all of these concepts, and relations of these concepts to time - such as how long occurrence lasts. However, the possibilities still aren't clear to me. I was wondering what related algorithms consider.
    Last edited: Aug 11, 2009
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