ALLIED Vision Technologies Guppy PRO F-503 - Manual (Page 130)

Description of the data path
Guppy PRO Technical Manual V4.0.0
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Format_7 Mode_6 By default and without further remapping use Format_7 Mode_6 for

2 out of 4 H+V sub-sampling
The different sub-sampling patterns are shown below.
Figure 58: Vertical sub-sampling (color)
Note

The image appears vertically compressed in this mode and no
longer exhibits a true aspect ratio.
Figure 59: 2 out of 4 H+V sub-sampling (b/w)
2 out of 4 2 out of 8
2 out of 4 H+V sub-sampling