Discriminative Learning in Biometrics by David Zhang Yong Xu & Wangmeng Zuo

Author:David Zhang, Yong Xu & Wangmeng Zuo
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

(5.37)

To deal with the adverse effect of rotation caused by palmprint preprocessing and the deformation caused by finger movement, the distance measure should have some tolerance for small angular differences and can be defined as

(5.38)

where denotes the lower threshold for angular tolerance. On the other hand, we also can form a distance measure to penalize large angular distance , which is unusual for genuine palmprint matching. We define

(5.39)

where denotes the upper threshold for angular penalization.

By taking both tolerance for small angular difference and penalty for large angular distance into account, a generalized angular distance is defined as

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