Such recognition algorithms the feature extraction based on a set of 2 - d gabor wavelet and computation of percentage mismatched bits hamming distance between a pair of iris representations developed by daugman , texture analysis methods developed by wildes and chinese academy of science , extraction of iris signatures by means of zero - crossing of the dyadic wavelet transform developed by boles and so on 深入研究了多种典型识别算法: daugman的基于2 - d复值gabor小波的虹膜相位编码和hamming距离的方法; wildes和中科院的基于虹膜纹理分析的方法; boles的基于小波过零检测的方法;上海交大的基于小波模极大值的方法等。并在此基础上,对虹膜识别系统中的图像预处理和识别的若干算法进行了改进。
Finally , we conduct the experiments of generating and receiving guided waves on a pipe with the transducer system we have developed in our lab . the result of these experiments indicates that the transducer system we have developed can effectively generate and receive special modes of guided waves we need , and restrain the guided wave modes that we do n ' t need . it is hopeful that our guided - waves transducer system can be used in the testing of pipes " flaw 最后，在实验室中进行探头在管道中激励接收超声导波的实验，实验结果表明，本文研制的探头系统能够在管道中有效地激励和接收所需的导波模态，并且能够抑制一些不希望出现的导波模态，有望用于管道缺陷的检测。
A new method is proposed to detect and distinguish current transformer saturation and linear sections , and the wavelet transform theory is used to detect the singular points of signals . because the current waveforms got from current transformer have singularity at the points of fault occurrence , the start of saturation and the end of saturation , we can distinguish these points according to their characters on line 在故障开始后对ta二次电流实时进行多尺度小波变换，由于ta二次电流波形在故障发生时刻进入饱和时刻和出饱和时刻都有奇异性，分别对应小波模极大值，因此可以根据小波模极大值的不同特征判断对应时刻的是进饱和点还是出饱和点。
