Palmprint pre-processing refers generally to the extraction of the region of interest and its normalization. A coordinate system is defined to align different palmprint images for matching. Normally, the central part of a palmprint is extracted from the image boundaries for reliable feature measurements. The extracted central part is further subjected to histogram equalization.
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(2009). Pre-Processing. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_565
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