Here is some information for the mis-informed.
This information comes from a 3Com Home Connect
PC Digital Camera 0776, Product Number 003718-10
Main Board PC number 1.012.0776-B, "optical head"
part number 1.012.0777-B.
The CCD sensor used the camera is a Sharp LZ2413H.
Again, to clarify it is the LZ2413H and *NOT* the LZ2423H!
1/4" 270k-pixel CCD Area Sensor.(512 horizontal x 492
vertical). This sensor has thirty optical black pixels
two on one side and 28 on the other. 512x492= 251k, the
thirty black "pixels" are accounted for under the 270k
(add thirty to the 512 number=542 x 492= 266k (guess it
depend on if you call a k 1000 or 1024-in electronics it
is 1000, btw).
details at
http://www.sharpsma.com/products/ccd/html/pc_cameras.html
FYI, 640x480= 307K, for which a 320k sensor would be used
for true 640 x 480.
True resolution tests will also show you that the camera
is not truely 640x480, and that lossy compression schemes
are used, which is the reason I investigated.
Repeated inquiries to 3Com have produced zero response.
In my personal opinion, I had the Intel Pro camera sitting
side by side with this 3Com. As much as I *hate* to say
it, the Intel camera looked much better, and much sharper,
with not as much loss, even after working with *all* of the
settings and getting the latest drivers/software. The
3Com camera would be more pleasing to someone who was not
interested in details, liked warmer tones, and liked their
pictures soft. The 3Com cam does a bit better in low
light and has better response in near-IR, allowing you
to see objects that are hotter than 400F, once you remove
the plastic blue IR-cut filter.
Doug Leeper
Senior Engineering Tech
leeper@cconnect.net