64 Operational Reference Genie HM-HC Series-GigE Vision Camera
Important Factors about the Flat Field Data (TIF) File
Data Format rules:
Camera Pixel format in 8-bit — Flat Field calibration data (8-bit) is saved as a 8-bit TIF file
Camera Pixel format in 10-bit — Flat Field calibration data (10-bit) is saved as a 16-bit TIF file
Flat Field 8-bit calibration data which is saved as an 8-bit data file (TIF) can only be loaded by a Sapera
application when the application pixel format is 8-bit.
Flat Field 10-bit calibration data which is saved as a 16-bit data file (TIF) can only be loaded by a Sapera
application when the application pixel format is 10-bit.
Flat Field 10-bit calibration data loaded in the camera remains valid if the pixel format is then changed to 8-bit.
Flat Field 8-bit calibration data loaded in the camera loses the 2 LSB DN on the 10-bit image data path if the pixel
format is changed to 10-bit.
Set up Dark and Bright Acquisitions with the Histogram Tool
Before performing calibration, verify Genie acquisition with a live grab. Also at this time make preparations to grab
a flat light gray level image, required for the calibration, such as a clean evenly lighted white wall or non-glossy
paper with the lens slightly out of focus. Ideally a controlled diffused light source aimed directly at the lens should
be used. Note the lens iris position for a bright but not saturated image. Additionally check that the lens iris closes
well or have a lens cover to grab the dark calibration image.
Verify a Dark Acquisition
Close the camera lens iris and cover the lens with a lens cap. Using CamExpert, click on the grab button and then
the histogram button. The following figure shows a typical histogram for a Genie grabbing a very dark image.
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