Multiple Regions Of Interest - Photon Focus SM2-D1312-TI6455 User Manual

ROI Dimension
1312 x 1082
1248 x 1082
1024 x 512
1056 x 512
1024 x 256
1056 x 256
Table 4.6: Read out time at different ROI settings for the SM2-D1312(IE)-TI6455 CMOS camera series in
sequential read out mode.
Exposure time
10 µs
100 µs
500 µs
1 ms
2 ms
5 ms
10 ms
12 ms
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 SM2-D1312(IE)-TI6455 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. 4.21 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. 4.22 shows another MROI drawing illustrating the effect of MROI on the image content.
Fig. 4.23 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.
.
4.3 Reduction of Image Size
SM2-D1312(IE)-TI6455-80
t = 18.23 ms
ro
t = 17.37 ms
ro
t = 6.78 ms
ro
t = 6.99 ms
ro
t = 3.39 ms
ro
t = 3.49 ms
ro
SM2-D1312(IE)-TI6455-80
54 / 54 fps
54 / 54 fps
53 / 54 fps
51 / 54 fps
49 / 54 fps
42 / 54 fps
35 / 54 fps
33 / 54 fps
SM2-D1312(IE)-TI6455-160
t = 9.12 ms
ro
t = 8.68 ms
ro
t = 3.39 ms
ro
t = 3.49 ms
ro
t = 1.70 ms
ro
t = 1.75 ms
ro
SM2-D1312(IE)-TI6455-160
108 / 108 fps
107 / 108 fps
103 / 108 fps
98 / 108 fps
89 / 108 fps
70 / 108 fps
52 / 99 fps
47 / 82 fps
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