Dalsa Genie HM640, User Manual

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Operational Reference Genie HM-HC Series-GigE Vision Camera
Partial Scan—Window ROI
Partial Scan (vertical cropping)
The Partial Scan mode, also know as vertical cropping, reduces the number of video lines grabbed for a frame. By
not scanning the full vertical area of the sensor, the maximum possible acquisition frame rate is proportionately
increased. As an extreme example, the HM640 scanning a 32 line frame (with an appropriately short integration
time), exposed around 1830 fps. A table of frame rates vs. sample vertical cropping values follows.
Scan Start Offset
Scan Line Count
Partial Image Scan
Partial Scan Illustration
Maximum Frame Rate (fps) Examples (model HM1400/HM1400XDR/HC1400)
Free Running Acquisition
(synchronous mode)
Triggered Acquisition
(reset mode - minimum 10 μ s exposure)
Vertical Lines
Acquired
Flat Field On Flat Field Off Flat Field On Flat Field Off
8-bit 10-bit 8-bit 10-bit 8-bit 10-bit 8-bit 10-bit
1024 64 32 75 37 64 32 75 37
768 86 43 100 50 86 43 100 50
512 129 64 150 75 129 64 150 75
480 137 68 160 80 137 68 160 80
368 179 89 208 104 179 89 208 104
256 258 129 300 150 258 129 300 150
128 516 258 600 300 498 258 600 300
64 990 516 1200 600 900 516 1200 600
32 1780 1032 2398 1200 1508 1032 1980 1200
16 2962 2020 3952 2398 2279 1677 2824 2277
8 4433 3156 4651 3597 3060 2392 4424 3058