Description of the data path
PIKE Technical Manual
V5.0.0
177
Color interpolation (BAYER demosaicing)
The color sensors capture the color information via so-called primary color
(R-G-B) filters placed over the individual pixels in a
BAYER mosaic
layout.
An effective BAYER
RGB color interpolation already takes place in all Pike
color version cameras.
In color interpolation a red, green or blue value is determined for each pixel.
An AVT proprietary BAYER demosaicing algorithm is used for this interpola-
tion (max. 3x3), optimized for both sharpness of contours as well as reduc-
tion of false edge coloring.
Color processing can be bypassed by using so-called RAW image transfer.
RAW mode is primarily used to
•
save bandwidths on the IEEE 1394 bus
•
achieve higher frame rates
•
use different BAYER demosaicing algorithms on the PC (for PIKE F-145
and PIKE F-505 the first pixel of the sensor is RED, for all other Pike the
first pixel is GREEN followed by RED).
Figure 100: BAYER demosaicing (example of 3x3 matrix)
Note
If the PC does not perform BAYER to RGB post-processing, the
b/w image will be superimposed with a checkerboard pattern.
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