What is it about?
It reveals an image rotation transformation experiences following nonlinear process: integer domain to real domain; real domain to integer domain. Such process can lead to significant minutia and singular point changes which can significantly affect fingerprint bio-cryptographic key generation.
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Why is it important?
It is a long held perception that image rotation process is a lossless process as we don't feel the difference visually. This work reveals that trivial quantization process can lead to significant feature changes if the feature depends on patterns of a few pixels such as fingerprint minutia and singular point. For biometric key generation that depends on the accuracy of fingerprint minutia and singular point, a significant error could be observed.
Perspectives
It is a well know fact the image rotation is a non-linear process that could cause distortion. However, as we can tell the difference visually, the consequence of such transformation has been ignored and often it is perceived as a lossless process. This work shows that applications that depend on fine-grained pixel patterns would expect significant errors.
Professor Jiankun Hu
University of New South Wales
Read the Original
This page is a summary of: A pitfall in fingerprint bio-cryptographic key generation, Computers & Security, July 2011, Elsevier,
DOI: 10.1016/j.cose.2011.02.003.
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