Image data flow
197
Manta Technical Manual V7.9.0
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
to RGB color interpolation already takes place in all Manta color version 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 interpolation
(2×2), optimized for both sharpness of contours as well as reduction of false edge
coloring.
Color processing can be bypassed by using the RAW image transfer.
RAW mode is primarily used to:
•
save bandwidths on the Gigabit Ethernet network
•
achieve higher frame rates
•
use different Bayer demosaicing algorithms on the PC
-
for Manta the first pixel of the sensor is red
Figure 117: Bayer demosaicing (Manta type A: example of 2×2 matrix)
Figure 118: Bayer demosaicing (Manta type B: example of 3×3 matrix)
If the PC does not perform Bayer to RGB post-processing, the monochrome image
will be superimposed with a checkerboard pattern.
