Baumer VEXG - Region of Interest

42
8.1.5 Region of Interest
With the "Region of Interest" (ROI) function it is possible to predene a so-called Region
of Interest (ROI) or Partial Scan. This ROI is an area of pixels of the sensor. On image
acquisition, only the information of these pixels is sent to the PC.
This function is employed, when only a region of the eld of view is of interest. It is coupled
to a reduction in resolution.
The ROI is specied by four values:
▪ Offset X - x-coordinate of the rst relevant pixel
▪ Offset Y - y-coordinate of the rst relevant pixel
▪ Size X - horizontal size of the ROI
▪ Size Y - vertical size of the ROI
Notice
For color binning and a dened region of interest, the setting of an odd number for the
offset is possible. This would lead to a pixel offset and consequently to false colors..
This is prevented by performing the offset on an image without binning. Binning is
then performed to this result.
8.1.5.1 ROI
Start ROI
End ROI
ROI Readout
In the illustration below, readout time would be decreased to 40%, compared to a full
frame readout.
Notice
Applies for cameras with rolling shutter sensor
The calculation of the ROI always takes place in FPGA. The speed does not increase.
Readout lines
Figure17►
ROI: Parameters
Figure18►
Decrease in readout
time by using partial
scan.