Multiple Regions Of Interest - Photon Focus MV1-D1312C CameraLink Series User Manual

4 Functionality
Table 4.7: Frame rates of different exposure times, [sequential readout mode / simultaneous readout mode
], resolution 1312 x 1082 pixel, FPN correction on.

4.3.4 Multiple Regions of Interest

The MV1-D1312 camera series can handle up to 512 different regions of interest. This feature
can be used to reduce the image data and increase the frame rate. An application example for
using multiple regions of interest (MROI) is a laser triangulation system with several laser lines.
The multiple ROIs are joined together and form a single image, which is transferred to the
frame grabber.
An individual MROI region is defined by its starting value in y-direction and its height. The
starting value in horizontal direction and the width is the same for all MROI regions and is
defined by the ROI settings. The maximum frame rate in MROI mode depends on the number
of rows and columns being read out. Overlapping ROIs are allowed. See Section 4.3.3 for
information on the calculation of the maximum frame rate.
Fig. 4.20 compares ROI and MROI: the setups (visualized on the image sensor area) are
displayed in the upper half of the drawing. The lower half shows the dimensions of the
resulting image. On the left-hand side an example of ROI is shown and on the right-hand side
an example of MROI. It can be readily seen that resulting image with MROI is smaller than the
resulting image with ROI only and the former will result in an increase in image frame rate.
Fig. 4.21 shows another MROI drawing illustrating the effect of MROI on the image content.
Fig. 4.22 shows an example from hyperspectral imaging where the presence of spectral lines at
known regions need to be inspected. By using MROI only a 656x54 region need to be readout
and a frame rate of 4300 fps can be achieved. Without using MROI the resulting frame rate
would be 216 fps for a 656x1082 ROI.
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36
Exposure time MV1-D1312C-160
10 µs 108 / 108 fps
100 µs 107 / 108 fps
500 µs 103 / 108 fps
1 ms 98 / 108 fps
2 ms 89 / 108 fps
5 ms 70 / 108 fps
10 ms
12 ms
52 / 99 fps
47 / 82 fps