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a lens defect which causes straight lines to be curved or bowed
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What do lens distortion data values a, b and c actually mean?
from http://wiki.panotools.org/Lens_correction_model
The actual lens correction parameters a, b and c which are used to correct for barrel distortion, pincushion distortion and even wavy distortion. … In most cases it will be enough to optimize for the b parameter only, which is good at correcting normal barrel distortion and pincushion distortion. …