User Manual

Description of the data path
Guppy PRO Technical Manual V4.0.0
134
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
Guppy PRO 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 (2x2), 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 all Guppy
PRO models the first pixel of the sensor is RED).
Figure 64: BAYER demosaicing (example of 2x2 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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