Allied Vision Alvium Series - Performance Tuning and Troubleshooting

300Alvium USB Cameras User Guide V4.6.1
Performance and troubleshooting
Optimizing performance
Image transfer with rolling shutter cameras
Alvium 1800 U-500m/c, U-501m NIR, U-1240 m/c, and U-2050m/c
If acquisition is started and stopped in a short sequence, no image is transferred to
the host. The duration cannot be predicted, because it depends on various factors.
Parameter changes
If parameters are changed while these cameras are streaming, the following
effects can occur.
Stopped streaming
Alvium 1800 U-500m/c, U-501m NIR, U-1240 m/c, and U-2050m/c
When
AcquisitionMode set to MultiFrame: If cameras are triggered by
AcquisitionStart, the streaming stops when parameters are changed.
For
MultiFrame acquisition, we recommend to you stop streaming before you
change parameters.
Frame rate jitter
Alvium 1800 U-120m/c, U-500m/c, U-501m NIR, U-1240 m/c, and U-2050m/c
Generally, some parameters can be changed during exposure without affecting the
timing. For models with ON Semiconductor AR sensors and rolling shutter sensors,
a different behavior must be considered for camera operation in freerun mode
without triggering:
Changing parameters during exposure leads to frame rate jitter. When parameters
are entered, the next frame starts only after readout and sensor reconfiguration
delay are finished. When the camera is run in
ExposureAuto mode, the actual
frame rate is less than the calculated value for the corresponding exposure time.
Consider frame rate jitter for your application, including a gap between
ExposureActive signals.
Figure 119: Delayed exposure due to parameter changes
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New parameters
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