4. Reminders and Tricks of the trade
From our experience we give the following reminders and tricks of the trade.
• Always remember to adjust the diaphragm opening and the focus of the image by
rotating the two rings in the front of the camera. Make sure that the image is
bright and clear enough for better results.
• As we can see from equation (4), the frame rate is irrelevant to the width of the
AOI. That means that in case you want to capture a video with big height and
small width (e.g., a bouncing ball) it is better if you rotate the camera 90 degrees
to adjust the AOI to a small height and a big width and this will not influence the
frame rate.
• For better quality picture make sure you have enough light towards your area of
interest. This way the exposure time can be set to low values and you can obtain
higher frame rates. If the image is too bright then you can adjust the brightness
from the settings, and this will not influence the frame rate.
5. Video Drivers and Video Formats
Until we have always assumed that the Basler BCAM 1394 video driver is used in
combination with AMCAP capturing software and that the camera operates in the video
format 7, mode 0. In video format 7, the frame rate is determined by the setting in the
Bytes per Packets field. This means that you can change the frame rate by adjusting
parameters such as exposure time, area of interest, and so on. Alternatively, you can use
the video format 0, in which the frame rate is determined by the Frame Rate field. Frame
rate ranges then from 1.875 up to 60 depending on the output format. Format 0, mode 1 is
used to capture in color with resolution of 320 × 240; Format 0, mode 3 is used to capture
in color with resolution of 640 × 480;Format 0, mode 5 is used to capture in gray scale
with resolution of 640 × 480.
In Spring 2007, a new driver became available for the Basler cameras using the GenICam
standard (www.genicam.org) and the pylon driver V1.0 became available. The pylon
driver offers reliable image data transport into the memory of your PC at a very low CPU
load and it contains a DirectX interface. The pylon viewer is a standalone application to
view and change parameter settings of the camera. It works well together with the
capturing programs like AMCAP and VirtualDub. In the latter case, the frame rate cannot
be preset, but capturing will take place at maximum frame rate.
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