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Posted by news.cup.hp.com on 04/13/06 17:16
Someone wrote:
> Have you *ever* studied how DVI, HDMI, *or* component video work? They
> output one pixel at a time, and the display changes one pixel at a time.
> Just like a CRT.
>
> Moron.
Video connectors necessarily act like a serial or parallel data cable, but
in the digital age, capture and display devices do not necessarily operate
"one pixel at a time".
CCD video cameras can essentially grab a whole frame within 1/60 of a second
or far faster, like 1/5000 of a second. The results of the nearly
instantanous frame grab are often placed into a frame buffer, and it is from
the frame buffer that a slower read process can serialize the bits (pixels)
over say an HDMI cable. You should also read about progressive segmented
frames (http://en.wikipedia.org/wiki/Progressive_segmented_Frame) as a
further example of how frame buffers between the CCD and video connector may
be necessary.
Ditto on the display side. Read http://en.wikipedia.org/wiki/LCD to see how
different types of LCD displays load their pixels. Many LCDs these days load
pixels a row at a time.
Thomas Gilg
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