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Information on the Sapera Flat Field Coefficients File
The Flat Field Coefficients File is a standard 16-bit TIFF file.
A Sapera application (such as CamExpert) creates a new SapBuffer object of the same width as the
sensor but with twice the number of lines. This provides the room to store both offset and gain Flat
Field data. The Flat Field offset data is contained in the top half of the new buffer, while the gain
buffer is in the bottom half.
A Sapera application saves the new buffer using SapBuffer::Save with the "-format tiff" option,
which allows saving data without loss of significant bits.
Important Factors about Flat Field Processing
Important: Before calibration, the Linea GigE should be powered on long enough to
achieve its nominal temperature (a minimum of 30 minutes). A low ambient
temperature may increase the time required for the camera to reach a stable internal
temperature.
Important: During calibration, no other Linea GigE features should be accessed or
modified.
Calibration via CamExpert or via a User Application: Exposure and frame rates
used during a Flat Field Calibration should be similar to the exposure settings used in
the camera application.
64 • Operational Reference
Linea GigE Series Camera
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