Pike Technical Manual
V5.2.0
190
Description of the data path
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 effec-
tive BAYER
RGB color interpolation already takes place in all Pike color ver-
sion cameras.
In color interpolation a red, green or blue value is determined for each pixel. An
Allied Vision proprietary BAYER demosaicing algorithm is used for this interpo-
lation (max. 3x3), optimized for both sharpness of contours as well as reduction
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 106: 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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