AW00123409000 Features
Basler ace USB 3.0 255
Vertical Decimation’s Effect on ROI Settings
If vertical decimation is activated, the camera
automatically adapts the ROI settings to the modified
image size based on the formulas below.
For evaluating the new ROI height, the camera takes
into account the number of physical lines that are
between the first transmitted line (L1) and the last
transmitted line (Ln), i.e. the so-called covered lines
(see Figure 100). The line Ln + 1 in our example would
not be part of the covered lines when the decimation
feature is activated.
Calculating the covered lines (C)
For mono cameras:
(C) = H_old x D_old - D_old + 1
For color cameras:
(C) = H_old x D_old - 2 x D_old +2
As soon as the covered lines are determined, the camera
calculates the new ROI height:
For mono cameras:
New ROI height = Round up (C / D_new)
C = Coverage
D_new = New decimation value
D_old = Old decimation value
H_new = New ROI height
H_old = Old ROI height
For color cameras:
New ROI height = 2 x Round up ((C / 2) / D_new)
If you use the decimation vertical feature and you reset the decimation vertical
parameter back to 1, i.e. you deactivate vertical decimation, the ROI height can be
smaller than the maximum possible height (determined by the pixel resolution in
vertical direction).
In this case you can manually set the ROI height back to the maximum possible
height.
Fig. 100: Covered Lines (Mono Camera)
L1
Ln
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