2009 |
Štruc, Vitomir; Pavešić, Nikola Gaussianization of image patches for efficient palmprint recognition Journal Article In: Electrotechnical Review, vol. 76, no. 5, pp. 245-250, 2009. Abstract | Links | BibTeX | Tags: biometrics, gaussianization, histogram remapping, palmprint recognition, palmprints, preprocessing @article{EV_2009_palms,In this paper we present a comparison of the two dominant image preprocessing techniques for palmprint recognition, namely, histogram equalization and mean-variance normalization. We show that both techniques pursue a similar goal and that the difference in recognition efficiency stems from the fact that not all assumptions underlying the mean-variance normalization approach are always met. We present an alternative justification of why histogram equalization ensures enhanced verification performance, and, based on the findings, propose two novel preprocessing techniques: gaussianization of the palmprint images and gaussianization of image patches. We present comparative results obtained on the PolyU database and show that the patch-based normalization technique ensures stat-of-the-art recognition results with a simple feature extraction method and the nearest neighbor classifier. |