ALLIED Vision Technologies Marlin F-201 - Manual (Page 98)

Description of the data path
MARLIN Technical Manual V2.4.0
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Sub-sampling (MARLIN F-131B/C,
MARLIN F-146C and MARLIN F-201C)
What is sub-sampling?
Definition Sub-sampling is the process of skipping neighboring pixels (with the same
color) while being read out from the CMOS or CCD chip.
Which Marlin models have sub-sampling?
• All CMOS equipped Marlin models, both color and b/w have this feature
(FW > 2.03).
• The CCD models Marlin F-146C and Marlin F-201C are also equipped with
this mode, acting as a preview mode. Because it is realized digitally
there is no further speed increase.
Description of sub-sampling
Sub-sampling is used primarily for the following reasons:
• A reduction in the number of pixels and thus the amount of data while
retaining the original image area angle and image brightness
• CMOS: an increase in the frame rate.
Similar to binning mode the cameras support horizontal, vertical and h+v
sub-sampling mode.
Have a look at the following table to check availability of the different sub-
sampling modes (h=horizontal, v=vertical).
Format_7 Mode_1 Only Marlin F-131B/C: By default use Format_7 Mode_1 for
• b/w cameras: 1 out of 2 horizontal sub-sampling
• color cameras: 2 out of 4 horizontal sub-sampling
The different sub-sampling patterns are shown below.
Camera model Sub-sampling h Sub-sampling v Subsampling h+v
MF-131B/C Format_7 Mode_1 Format_7 Mode_2 Format_7 Mode_3
MF-146C not available not available Format_7 Mode_2
MF-201C not available not available Format_7 Mode_2
Table 35: Sub-sampling modes MF-131B/C, MF-146C and MF-201C