Point Grey Research Grasshopper Technical Reference
Camera Operations and Features
Revised 26-Nov-10
Copyright (c) 2010 Point Grey Research Inc.
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It is also possible to force the camera to perform the auto exposure algorithm on a certain ROI
within the image. Please see the documentation for the AE_ROI register located at 0x1A70 to
0x1A74 in the PGR IEEE-1394 Digital Camera Register Reference.
4.5.5. Extended Shutter Times
The maximum shutter time for the Grasshopper can be extended beyond the normal shutter
range by setting the ON_OFF bit [6] of the FRAME_RATE register 0x83C to zero (OFF). Once
the FRAME_RATE is turned off, you should see the Max_Value of the ABS_VAL_SHUTTER
register increase.
L
The maximum extended shutter time reported by the SHUTTER_INQ
register 51Ch is capped at 4095 (0xFFF), the maximum value allowed
by the Max_Value field of this register. Use the Max_Value of the
ABS_VAL_SHUTTER register to determine the maximum shutter.
Model Format and FPS Min (ms) Max (ms) Notes
640x480 Y8, 60 FPS 0.01 2132
640x480 Y8, 30 FPS 0.01 2132
GRAS-03K2M
GRAS-03K2C
640x480 Y8, 15 FPS 0.01 2132
640x480 Y8, 60 FPS 0.01 2046
640x480 Y8, 30 FPS 0.01 3271
640x480 Y8, 15 FPS 0.01 3271
640x480 Y8, 7.5 FPS 0.01 3271
640x480 Y8, 3.75 FPS 0.01 24540
GRAS-03S3M
640x480 Y8, 1.875 FPS 0.01 49080
1280x960 Y8, 15 FPS 0.01 4225
1280x960 Y8, 7.5 FPS 0.01 6543
1280x960 Y8, 3.75 FPS 0.01 6543
GRAS-14S3M
GRAS-14S3C
1280x960 Y8, 1.875 FPS 0.01 16300
1280x960 Y8, 15 FPS 0.01 4629
1280x960 Y8, 7.5 FPS 0.01 6543
1280x960 Y8, 3.75 FPS 0.01 6543
GRAS-14S5M
GRAS-14S5C
1280x960 Y8, 1.875 FPS 0.01 24540
1600x1200 Y8, 30 FPS 0.01 1775
1600x1200 Y8, 15 FPS 0.01 3442
1600x1200 Y8, 7.5 FPS 0.01 6543
1600x1200 Y8, 3.75 FPS 0.01 3543
GRAS-20S4M
GRAS-20S4C
1600x1200 Y8, 1.875 FPS 0.01 26175
1600x1200 Y8, 15 FPS 0.01 2777
1600x1200 Y8, 7.5 FPS 0.01 5554
1600x1200 Y8, 3.75 FPS 0.01 6543
GRAS-50S5M
GRAS-50S5C
1600x1200 Y8, 1.875 FPS 0.01 19631
Table 11: Extended shutter minimum and maximum times
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