SVS-Vistek evo1050 Operation Manual - page 44
6 Basic understanding of CCD Technology | 37
All color cameras are identical to the black and white versions. The
color pixels are transferred in series from the camera, same as the
monochrome but to be considered as “raw”
The camera uses a CCD which has a color mosaic filter. This filter is
called “Bayer” filter named after the person who invented it. It has a
pattern on the lines which alternates as follows:
E.g.: First line: GRGRGR... and so on. (R=red, B=blue, G=green)
Second line: BGBGBG... and so on. Please note that about half of
the pixels are green, a quarter red and a quarter blue. This is due to the
maximum sensitivity of the human eye at about 550 nm (green).
Because these cameras are single chip cameras it is necessary to use an
algorithm which interpolates those colors which are “not known” by
the specific pixel. E.g. the red pixel does not have information of green
and blue components. This means that the performance of the image
depends on the software used.
Please be aware that it is not possible to incorporate the algorithm
into the camera so easily. Unlike NTSC/PAL cameras there is no
hardware chip available which can do that for such large images. The
user has the advantage to alter the colors depending on his needs. Thus
the color image must be processed in the PC. A color source code is
available on request.
Color Pixels are transferred in Series
NOTICE
it is recommended to use a iR cut filter all times for
color applications!
6.3 Cameras with Color Sensors