Basler Vision Technologies Sprint Series, User Manual

Page: 88 / 236

Exposure Start and Exposure Time Control
78 Basler sprint Mono Cameras
Segment 1 includes 64 of the pixels in the AOI and segment 2 includes 192 of the pixels in the
AOI. The Max Seg AOI Pixels in this situation would be 192 (because segment 2 contains the
largest part of the AOI and the number of AOI pixels in segment 2 is 192).
Fig. 33: AOI Falling Across Segments
Note
If you have set an AOI to extend over two adjacent sensor segments and to use
each sensor segment only partially, the Max Seg AOI Pixels will be smallest
when the AOI is evenly divided across the two segments (i.e., each segment
contains the same number of AOI pixels). Positioning the AOI so that it is
evenly divided across the two segments will yield the best results from formula
two.
If you have set an AOI to extend over three or four adjacent sensor segments,
at least one complete segment will be part of the AOI and therefore the Max
Seg AOI Pixels will be 2048. in this case, the positioning of the AOI will not
influence the result from formula two.
Note
We recommend using an AOI that is centered on the sensor when operating
the camera in dual line acquisition mode (see
page 39 ). When an AOI is
centered on the sensor, the number of pixels outside of the AOI will be the
same on both sides of the AOI. If an AOI is not centered, the maximum allowed
line acquisition rate may be lower than suggested by the formulas given above.
If you are using an AOI that is not centered, determine the maximum allowed
line acquisition rate via the CCT+ or the Line Period CSR: Check the Line
Period parameter in the Exposure parameter group of the CCT+ or check the
absolute min field of the Line Period CSR (see
page 171 ) and use the line
period value to calculate the maximum allowed line acquisition rate.
Knowing the maximum allowed line acquisition rate or the minimum line period
will be particularly important when you want to operate the camera under the
control of an external sync signal (see
page 33 ).
Check the line period value before setting the camera to operate under the
control of an external sync signal. Otherwise, the line period value will not be
indicated.
Segment 1 Segment 2
Pixel 1 Pixel 2048 Pixel 2049 Pixel 4096 Pixel 1985
64 Pixels 192 Pixels
Pixel 2240
= pixel within the AOI