8.Features
© China Daheng Group, Inc. Beijing Image Vision Technology Branch 49
Width
: The current image width.
Height
: The current image height.
PixelSize
: The size of the pixel, in 8bit mode, the value is 1, and in 10bit/12bit mode, the value is 2.
BandWidth
USB
: The bandwidth of the USB interface, unit: Bps.
DeviceLinkThroughputLimit
: The limit of the device link throughput bandwidth, unit: Bps.
T
acq
: The acquisition time of the camera, unit: μs.
T
exp
: The exposure time of the camera, unit: μs.
2)
Frame rate (Unit: fps)
F =
10
6
𝑇
𝑓
It is recommended to use the frame rate calculation tool, the frame rate will be calculated
automatically after the configuration parameters are filled.
8.4.2.
USB Interface Bandwidth
The theoretical bandwidth of the USB interface of VEN-U3 series camera is 400MBps, but actually the
value will decrease with the type of the USB3.0 host controller, the version of the host controller driver, the
wastage of the HUB and the host performance. The user can refer the test result of the interface bandwidth
in <TN-USB3.0 host controller bandwidth and CPU utilization> document.
8.4.3.
DeviceLinkThroughputLimit
The VEN-U3 series camera provides bandwidth limit function, in order to control the upper limit bandwidth
of single device. When the DeviceLinkThroughputLimit is greater than the current device acquisition
bandwidth, the current device acquisition bandwidth will not change, when the DeviceLinkThroughputLimit
is less than the current device acquisition bandwidth, the current device acquisition bandwidth will be
reduced to the limit of the DeviceLinkThroughputLimit, the current device acquisition bandwidth can be
read from the camera.
When the camera is working in trigger mode, the bandwidth limit will restrict the maximum trigger frequency.
Model
Min. of
DeviceLinkThroughputLimit
Max. of
DeviceLinkThroughputLimit
Step of
DeviceLinkThroughputLimit
VEN-161-61U3M-
(M01/M05/M06)
35000000Bps
（
8bit
）
200000000 Bps
1000000Bps
70000000Bps
（
10bit
）
Table 8-5 VEN-U3 camera bandwidth control
