Re: Subwindowing the camera

On Jul 17, 1:57 pm, james <bondwiththebest2...@xxxxxxxxx> wrote:
Hello,

Can anyone please kindly tell me what is subwindowing the camera? what
are its advantages?

Thanks in advance,
James.

Look what I found via google:
http://www.astrovid.com/technical_documents/Lumeneralucameramanual.pdf

"Subwindowing, also known as region of interest, is the ability of the
camera to output a smaller image size (subwindow) than the whole
imager array. An imager that supports a maximum resolution of
1280x1024 pixels for example, could output a subwindow of 640x480
pixels with the subwindow being positioned nearly anywhere inside the
1280x1024. The subwindow is actually a smaller field of view than the
maximum resolution available. There are limitations on the granularity
of the subwindow size and on its position within the whole array. The
granularity is 8 pixels. ....."

Seems like a pretty good description. Basically you get a small
rectangular random access portion of contiguous pixels that's within
the entire image array. It's different than binning or subsampling
because you have single entire pixels that must be adjacent to each
other.

I think it's CMOS sensors that support this random access of pixels
and CCD's don't, although I could be wrong now since many stereotypes
defining the differences between CCD and CMOS seem to be becoming
obsolete as each tries to keep up with the desirable features of the
other. Here's a good article on that topic:
http://www.dalsa.com/markets/ccd_vs_cmos.asp

Regards,
ImageAnalyst

.