The Wyner-Ziv Problem for general sources with average distortion under fixed-length coding is investigated in this paper. To solve the problem,an enhanced covering lemma for a Markov chain is first established. Then ...The Wyner-Ziv Problem for general sources with average distortion under fixed-length coding is investigated in this paper. To solve the problem,an enhanced covering lemma for a Markov chain is first established. Then based on the lemma,a general formula for the rate-distortion function of the problem is derived,where the distortion is only assumed uniformly bounded and may be nonadditive. Finally,it is further pointed out that such methods can be used to establish more general results on multiterminal source coding problems.展开更多
Palmprint recognition has attracted considerable attention due to its advantages over other biometric modalities such as fingerprints,in that it is larger in area,richer in information and able to work at a distance.H...Palmprint recognition has attracted considerable attention due to its advantages over other biometric modalities such as fingerprints,in that it is larger in area,richer in information and able to work at a distance.However,the issue of palmprint privacy and security(especially palmprint template protection)remains under-studied.Among the very few research works,most of them only use orientational features of the palmprint with transformation processing,yielding unsatisfactory recognition and protection performance.Thus,this research work proposes a palmprint feature extraction method for palmprint template protection that is fixed-length and ordered in nature,by fusing point features and orientational features.Firstly,dual orientations are extracted and encoded with more accuracy based on the modified finite Radon transform(MFRAT).Then,SURF feature points are extracted and converted to be fixed-length and ordered features.Finally,composite fixed-length ordered features that fuse up the dual orientations and SURF points are transformed using the irreversible transformation of index-of-max(IoM)to generate the revocable palmprint templates.Experiments show that the matching accuracy of the proposed method of fixed-length and ordered point features are superior to all other feature extraction methods on the PolyU and CASIA datasets.It is also demonstrated that the EERs before and after IoM transformation are better than all other representative template protection methods.A thorough security and privacy analysis including brute-force attack,false accept attack,birthday attack,attack via record multiplicity,irreversibility,unlinkability and revocability is also given,which proves that our proposed method has both high performance and security.展开更多
基金Project supported by the National Natural Science Foundation of China (Nos. 60472079 and 60602023) China Postdoctoral Sci-ence Foundation (No. 20060400314)
文摘The Wyner-Ziv Problem for general sources with average distortion under fixed-length coding is investigated in this paper. To solve the problem,an enhanced covering lemma for a Markov chain is first established. Then based on the lemma,a general formula for the rate-distortion function of the problem is derived,where the distortion is only assumed uniformly bounded and may be nonadditive. Finally,it is further pointed out that such methods can be used to establish more general results on multiterminal source coding problems.
基金funded by the National Natural Science Foundation of China(61906149)the Key Research and Development Program of Shaanxi(2024GX-YBXM-543)+2 种基金the Natural Science Basic Research Program of Shaanxi(2024JC-YBMS-471)the Chunhui Project of the Ministry of Education of China(202200927)the Fundamental Research Funds for the Central Universities(ZYTS24150).
文摘Palmprint recognition has attracted considerable attention due to its advantages over other biometric modalities such as fingerprints,in that it is larger in area,richer in information and able to work at a distance.However,the issue of palmprint privacy and security(especially palmprint template protection)remains under-studied.Among the very few research works,most of them only use orientational features of the palmprint with transformation processing,yielding unsatisfactory recognition and protection performance.Thus,this research work proposes a palmprint feature extraction method for palmprint template protection that is fixed-length and ordered in nature,by fusing point features and orientational features.Firstly,dual orientations are extracted and encoded with more accuracy based on the modified finite Radon transform(MFRAT).Then,SURF feature points are extracted and converted to be fixed-length and ordered features.Finally,composite fixed-length ordered features that fuse up the dual orientations and SURF points are transformed using the irreversible transformation of index-of-max(IoM)to generate the revocable palmprint templates.Experiments show that the matching accuracy of the proposed method of fixed-length and ordered point features are superior to all other feature extraction methods on the PolyU and CASIA datasets.It is also demonstrated that the EERs before and after IoM transformation are better than all other representative template protection methods.A thorough security and privacy analysis including brute-force attack,false accept attack,birthday attack,attack via record multiplicity,irreversibility,unlinkability and revocability is also given,which proves that our proposed method has both high performance and security.
