Integrate While Read - FLIR X8400sc User Manual

6.5.2 Integrate While Read

The Integration and the Data Readout periods can be thought of as two separate processes.
However, they are linked together by certain timing requirements. This means that the
camera can integrate for a period, starts the data read out for that integration period, and
during that readout starts the integration period for the next frame. This process is called
Integrate While Read (IWR) and can greatly speed up frame rates as seen in
pattern noise into the data which can be removed by performing a Non Uniformity Correction
(NUC) to the data.
Figure 7: IWR Frame Generation Process
6.5.2.1 Max Achievable frame rate in IWR Mode – Base Mode
1024
896
768
640
512
384
320
256
224
192
160
128
96
64
56
48
40
32
24
16
8
2
•
Note
User Manual X8400 sc
Figure 7.
Frame Sync
Integration
Data Read
Data Width
Integration Period Dead Time
1280 1152 1024 896
57 63 71
65 72 80
76 84 93 106
90 100 111 126
112 124 138 156
148 163 181 205
176 193 215 243
216 238 265 298
245 269 299 337
282 310 344 386
332 364 404 453
403 442 490 548
515 563 621 693
711 774 850 943
786 855 937 1036
878 953 1043 1150
995 1078 1175 1292
1149 1240 1347 1474
1358 1459 1577 1716
1660 1773 1902 2053
2134 2258 2397 2553
2717 2841 2976 3125
Table 7: Maximum Frame Rate vs Image Size
(detector Mode: IWR / Base / integration time = 1500µs)
In IWR mode, the integration time has much less effect on maximum frame rate.
The drawback to this process is that it injects a fixed
Integration can't start
before previous frame's
Data Read
Frame Sync
Integration must end after
the previous frame's Data
Integration
Data Read
Dead Time
Integration Period Dead Time
Number of points
768 640 512
80 92 106 106
91 105 121 121
122 140 140
145 167 167
179 206 206
235 270 270
278 319 319
341 391 391
385 440 440
441 503 503
516 587 587
622 706 706
784 885 885
1058 1185 1185
1160 1294 1294
1283 1426 1426
1435 1588 1588
1628 1792 1792
1882 2055 2055
2229 2409 2409
2732 2911 2911
3290 3449 3449
the Dead Time following
Read
Data Width Dead Time
384 256 128
106 106 106
121 121 121
140 140 140
167 167 167
206 206 206
270 270 270
319 319 319
391 391 391
440 440 440
503 503 503
587 587 587
706 706 706
885 885 885
1185 1185 1185
1294 1294 1294
1426 1426 1426
1588 1588 1588
1792 1792 1792
2055 2055 2055
2409 2409 2409
2911 2911 2911
3449 3449 3449
34