An optimized medical image compression algorithm based on wavelet transform and improved vector quantization is introduced. The goal of the proposed method is to maintain the diagnostic-related information of the medical image at a high compression ratio. Wavelet transformation was first applied to the image. For the lowest-frequency subband of wavelet coefficients, a lossless compression metho...

The combination of feedback and quantization causes special problems. (Each on its own has its problems, like instability and round-off errors.) The main problem is the likely existence of multiple equilibria or limit cycles. Another is possible coherence between the input signal and quantization error or limit cycle, making the error indistinguishable from whatever signal characteristic we wan...

In this talk, we briefly review the basic concepts of anomalous gauge theories. It has been known for some time how theories with local anomalies can be handled. Recently it has been pointed out that global anomalies, which obstruct the quantization of certain gauge theories in the temporal gauge, get bypassed in canonical quantization. Anomalies of two different types can be involved in the qu...

In order to test the canonical quantization programme for general relativity we introduce a reduced model for a real sector of complexified Ashtekar gravity which captures important properties of the full theory. While it does not correspond to a subset of Einstein’s gravity it has the advantage that the programme of canonical quantization can be carried out completely and explicitly, both, via...

It is shown that the canonical flux quantization, which is described by the usual commutator postulate or by its equivalent uncertainty relation on the related phase space, can result in the quantization of Hall-measures. Further it is shown that the polarization of this phase space, which is necessary for its quantization, results in the vanishing of longitudinal components of resistivity and ...

0957-4174/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.eswa.2011.08.165 ⇑ Corresponding author. Tel.: +39 0547 339121; fax E-mail addresses: [email protected] (L. Nanni), (S. Brahnam), [email protected] (A. Lumini). Presented in this paper is a novel feature extractor technique based on texture descriptors. Starting from the standard feature vector representation, we study ...

This paper focuses on the use of image-based techniques in biometric verification. A detailed review of the existing literature on texture descriptors is provided and several methods are compared on three well known biometric problems: palm verification, knuckle verification and fingerprint verification. The texture descriptors evaluated in this study are based on the most commonly used measure...