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Region of Interest 9.1.8
With the " Region of Interest" (ROI) function it is possible to predefine 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. Therefore, not all lines
of the sensor are read out, which decreases the readout time (t
readout
). This increases the
frame rate.
This function is employed, when only a region of the field of view is of interest. It is coupled
to a reduction in resolution.
The ROI is specified by four values:
▪ Offset X - x-coordinate of the first relevant pixel
▪ Offset Y - y-coordinate of the first relevant pixel
▪ Size X - horizontal size of the ROI
▪ Size Y - vertical size of the ROI
9.1.8.1 ROI
Start ROI
End ROI
ROI Readout
In the illustration below, readout time would be decreased to 40%, compared to a full
frame readout.
Readout lines
◄ Figure 16
ROI: Parameters
◄ Figure 17
Decrease in readout
time by using partial
scan.