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Flat-Field Correction Processor Utility

Photonics.com
May 2006
Imperx Inc.Request Info
 
Free Lynx Camera Software Upgrade
BOCA RATON, Fla., May 11, 2006 -- Vignetting -- falloff of image brightness with distance from the frame’s center -- and pixel-to-pixel CCD-sensitivity variations can be major problems for machine-vision systems used in inspection and motion-control applications. Imperx’s Lynx programmable cameras include software correction for these variations, based on an array of calibration coefficients measured during final product testing at their factory, but these coefficients cannot fully compensate for changes in vignetting when different lenses are used or pixel sensitivities change with age.

To eliminate this problem, Imperx has introduced the Imperx FFC processor utility as a free software upgrade for its IPX-2M30, IPX-2M30H, IPX-4M15 and IPX-11M5 series cameras. The utility, which runs on the imaging system’s host computer, guides the user through a four-step calibration process identical to what the factory’s test department uses to field-correct cameras during final test. The result is a flat-field correction (FFC) file containing the correction factors the camera needs to perform onboard flat-field correction while acquiring images. The final steps load the file into the camera and turn on the FFC feature. The camera then provides images identical to what a hypothetical perfect camera system -- with no vignetting or sensitivity variations -- would provide.

The user can create a library of FFC files for each lens/aperture setting/illumination combination to be used in an application and can automatically download the appropriate corrections whenever the camera configuration changes.

For more information, visit: www.imperx.com; e-mail: info@imperx.com



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GLOSSARY
vignetting
In an optical system, the gradual reduction of image illuminance as the off-axis angle increases, resulting from limitations of the clear apertures of elements within the system.  
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