ALLIED Vision Technologies Pike F-1600 - Manual (Page 178)

Description of the data path
PIKE Technical Manual V5.1.2
178
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.
Note

The image appears vertically compressed in this mode and no
longer exhibits a true aspect ratio.
Figure 97: 2 out of 4 H+V sub-sampling (b/w)
Figure 98: 2 out of 8 H+V sub-sampling (b/w)
2 out of 4 H+V sub-sampling
2 out of 8 H+V sub-sampling