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Automatic estimation of symbol parameters plays a prominent role in electronic reconnaissance and electronic warfare systems. How to estimate the code width without prior knowledge is an important problem in modulation recognition. Hilbert transform can effectively extract the instantaneous mutation characteristics of digital communication signals. In this paper, in order to demodulate MPSK underwater...
As we all know, face recognition usually cares about the main features of a face, such as the shapes and relative positions of the main facial feature, and ignores the illumination changes on the face. Accordingly, A novel method to extract illumination invariant features using the Dual-tree complex wavelet transform for face recognition under varying lighting conditions, the proposed method estimates...
Data compression becomes an increasingly important problem in power quality online monitoring network due to the increasing quantity of sample data. Huffman code algorithm and Huffman code combined with wavelet transform are widely used in data compression. However, the compression ratio (CR) is not high enough because the characteristic of power quality data is not considered. Hence, efficient compression...
The compression processing of fingerprint image is of great importance in the computer fingerprint recognition system. Based on analyzing the frequent image compression methods, the author studies the image compression methods with multi-scale two-dimensional wavelet transform, and put forward a new fingerprint image compression evaluation method.
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