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Feature fusion of palmprint and face via tensor analysis and curvelet transform

Xu X., Guan X., Zhang D., Zhang X., Deng W.

Opto-Electronics Review

2012

Vol. 20, No. 2

138-147

In order to improve the recognition accuracy of the unimodal biometric system and to address the problem of the small samples recognition, a multimodal biometric recognition approach based on feature fusion level and curve tensor is proposed in this paper. The curve tensor approach is an extension of the tensor analysis method based on curvelet coefficients space. We use two kinds of biometrics: palmprint recognition and face recognition. All image features are extracted by using the curve tensor algorithm and then the normalized features are combined at the feature fusion level by using several fusion strategies. The k-nearest neighbour (KNN) classifier is used to determine the final biometric classification. The experimental results demonstrate that the proposed approach outperforms the unimodal solution and the proposed nearly Gaussian fusion (NGF) strategy has a better performance than other fusion rules.

L-cysteine modified CdS nanoparticles as a novel DNA probe

Lai S., Guan X.

Chemia Analityczna

2009

Vol. 54, No. 3

295-308

A novel DNA probe based on the measurement of enhanced resonance light-scattering (RLS) . resulting from the interaction of the functionalized L-cysteine capped CdS nanoparticles (nano-L-cysteine-CdS) with DNA has been proposed. The RLS signals of nano-L-cysteine--CdS were greatly enhanced by DNA at the wavelength of ca 415 nm. The relationship if! between the measured signal magnitude and DNA content was linear in the concentration range of 20-700 ng mL-1 for calf thymus DNA and 30-800 ng mL-1 for fish sperm DNA. Detection limits (S/N = 3) were 1.5 and 1.9 ng mL-1, respectively. Based on these results, a new direct quantitative method for determination of DNA was established. This procedure has higher sensitivity and better selectivity than most of other similar methods, due to ' the nature of nanoparticles.

Zaproponowano nową sondę DNA opartą na pomiarze wzmocnienia rezonansowego rozproszenia światła (RLS), które jest wynikiem oddziaływań między DNA i nanocząsteczkami CdS zmodyfikowanego L-cysteiną (nano-L-cysteina-CdS). Sygnały RLS były znacznie wzmocnione przy długości fali 415 nm. Zależność między wielkością sygnału i stężeniem DNA była liniowa w zakresie stężeń 20-700 ng mL-1 w przypadku grasicy cielęcej i 30-800 ng mL-1w przypadku nasienia ryby; granica wykrywalności (S/N = 3) wynosiła odpowiednio: 1,5 oraz 1.9 ng mL-1. Ustalona procedura, ze względu na naturę nano- cząsteczek, ma lepsząselektywność i czułość w porównaniu z innymi, podobnymi metodami.