Applied Informatics and Communication: International by Yan Li, Xiaolei Tong, Jiayue Dai (auth.), Jianwei Zhang

By Yan Li, Xiaolei Tong, Jiayue Dai (auth.), Jianwei Zhang (eds.)

The 5 quantity set CCIS 224-228 constitutes the refereed lawsuits of the overseas convention on utilized Informatics and verbal exchange, ICAIC 2011, held in Xi'an, China in August 2011.

The 446 revised papers provided have been conscientiously reviewed and chosen from a number of submissions. The papers hide a vast variety of subject matters in machine technological know-how and interdisciplinary functions together with keep an eye on, and software program structures, neural computing, instant networks, info platforms, and photo processing.

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Additional info for Applied Informatics and Communication: International Conference, ICAIC 2011, Xi’ian, China, August 20-21, 2011. Proceedings, Part III

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Reference Point Location [5] Many previous approaches like Poincaré index and maximum curvature method work well in good quality fingerprint images, but fail to correctly localize reference points in poor quality fingerprints with cracks and scars. According to the directional distribution of ridge, design the filter to match the center. Deal orientation field with filters of two-dimensional convolution to obtain the filtering image. The value of each pixel represents the responses to the filter, so the pixel with the maximum value is the center of the original image.

Tree structure of wavelet hummock three layer analyse Table 1. 875~1 S = S 30 + S 31 + S 32 + S 33 + S 34 + S 35 + S 36 + S 37 It is supposed that in the origin signal S the lowest frequency is 0 and the maximum frequency is 1, and the extracted eight frequency bands S 3 j ( j = 0,1, ,7) are listed in Table 1. 3) Computer total energy of the signals with all the frequency bands. The input signal is a stochastic signal and the output signal is a stochastic signal. E 3 j ( j = 0,1, ,7) are the energy of the corresponding signals S 3 j ( j = 0,1, ,7) .

A 20-pixel wide band captures an area spanning about one ridge and valley pair, on an average, in a 500 dpi fingerprint image. A band with a width of 20 pixels is necessary to capture a single minutia in a sector, allowing our low-level features to capture this local information. If the sector width is more than 20 pixels, then the local information may be modulated by more global information. Otherwise, less than 20 pixels, the global information may be partly loss. The innermost two band (circle) are not used for feature extraction because the flow field in a region around a very high curvature point (core) has poor coherence.

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