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Tau 640 User’s Manual
3—Basic Operation of the Tau 640 and GUI
TAU-0640-00-10, version 110
June 2011
3-17
Flat-Field Correction (FFC):
The Tau 640
automatically performs flat-field corrections (see paragraph
“Flat-Field-Correction Mode:” on page 3-12). A green square
is displayed on your video monitor as a warning that the FFC
is going to take place. Use this function to set the number of
analog video frames (33ms NTSC, 40ms PAL) during which
the warning will be displayed. The time period, specified in
frames, can range from 0 to 30,000 frames. The factory
setting of 60 frames equates to a two second warning. Setting the
FFC Warning
to less than
15 turns off the warning.
Dynamic Digital Detail Enhancement (DDE) filter:
The DDE algorithm sets edge enhancement dynamically
proportional to the number of bins occupied in the image
histogram.
In a high dynamic range scene the gain will be higher than in
a low dynamic range scene. This allows faint details to be
visible in high dynamic range scenes without increasing
temporal and fixed pattern noise in low dynamic range
scenes.
The DDE filter operates independently from the AGC and will enhance edges without effecting
brightness or contrast. The valid range of Dynamic DDE setting is from 1 to 63 with 17 being
the neutral setting where the filter has no effect. Settings below 17 will smooth the image
reducing the appearance of sharp edges. Higher DDE settings will enhance all image non-
uniformities resulting in a very detailed but grainy picture especially in high dynamic range
scenes. Typical factory settings are between 25 and 30. Settings from 18 to 39 are normal
imaging modes where the edge enhancement can be tuned for the scene. Use the slider to
adjust the setting, or select the text field and type in the desired setting. Avoid using setting 16.
Note
Video On/Off:
This feature allows you to turn off
the analog video output which will result in some power
savings (approximately 55mW).
Video Standard:
Choose the video standard for
your system.
In 14-bit Raw mode, selecting the DDE mode will not affect the digital data output.