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5 –Camera Controller
A6600/A6650 User’s Manual
25
The next window allows the user to name the NUC. Simply type in the name for the table in the text
box or select a previously saved file to replace it. Select
Next>>
to continue.
The next two screens will collect data from the NUC sources. If using the internal flag you will only
see a few status messages. If using external blackbodies you will be prompted. After each step, click
Next>>
to continue.
The last screen gives a report of the bad pixels found. The dialog shows how many pixels failed in
each category. If the result is satisfactory, click Accept to save the NUC. The NUC table will be
stored to flash memory and loaded into RAM memory for that preset. If the NUC is poor and you want
to abort, click
[Discard]
.
NOTE
: It is possible for a bad pixel to fail more than one category, so the total bad pixels may be less
than the sum of each category. “Factory” bad pixels are those that were determined to be bad during
camera production testing.
What is a Non-Uniformity Correction (NUC)?
Non-Uniformity Correction (NUC) refers the process by which the camera electronics correct for the
differences in the pixel-to-pixel response for each individual pixel in the detector array. The camera
can create (or allow for the user to load) a Non-Uniformity Correction (NUC) table which consists of a
unique gain and offset coefficient and a bad pixel indicator for each pixel. The table is then applied in
the digital processing pipeline as shown in Figure 4-12. The result is corrected data where each pixel
responds consistently across the detector input range creating a uniform image.