Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
传统的条码识别方法是通过二阶导数零交叉来定位条码边界。
Based on zero crossing representation of wavelet transform of this radial function and matching procedure, a new algorithm to identify orbits of shaft centerline is proposed.
基于此函数的小波变换零交叉表示和匹配过程，得到了识别轴心轨迹的一种新方法。
Two technologies, spectral channelization and spectral analysis with zero crossing that could be both applied to multi-signals, are also introduced.
介绍了两个可以用于多信号测电子科技大学博士论文频的技术：频率信道化和过零点谱分析。
Wavelet zero crossing representation is investigated. A new and simple method of reconstructing signal from its wavelet zero crossing representation is given.
分析了信号零交叉表示方法，给出了新的由零交叉表示进行原始信号重构的算法。
As can be seen from the illustration, the sum of the values from a given ray crossing the segments in its path is zero.
从图中可看出，给定射线与其路径中的段的交叉值总和是零。
A new edge tracking algorithm based on zero-crossing edge detection technique is applied in the process of threshold computing.
在阈值计算过程中，还用到一种基于过零点边缘检测技术的边缘追踪算法。
The paper introduces the definition of wavelet transform and its properties. Especially the philosophy for zero-crossing wavelet and how it can be used in seismic prospecting are presented.
介绍了小波变换的定义及小波变换的性质，特别介绍了零通小波的理论及其如何在地震勘探资料处理中的应用。
If a voltage change requires that a different tap be selected, the new tap is electronically switched in precisely at the zero-crossing, to avoid distorting the AC waveform.
如果电压变化需要选择不同的自来水，新的电子开关水龙头恰恰是在零交叉，以避免扭曲的交流波形。
The test result indicated that no significant difference in different zero crossing wavelengths.
说明不同零交点波长的检测结果无显著性差异。
Firstly, a new zero-crossing detection method with software comparing with hardware is designed.
设计了一种新的软硬件相结合的方法去检测反电动势过零点。
The filter processes input discrete sampling signal to recover continuous signal and suppress harmonic noise, and the zero-crossing frequency measuring method is improved.
该滤波器通过处理输入离散采样信号获得连续信号并抑制谐波噪声，改进了过零测频方法。
The effect of different zero crossing wavelengths on determination of mixed colorants in food under the same divisor factor in derivative ratio spectrum were discussed.
探讨比值导数波谱法中相同除数因子下的不同零交点波长对食品混合色素检测的影响。
The zero-crossing of the wavelet transform of the normal person pulse-wave is found out as a fact that its the wavelet transform coefficients correspond strictly to its time field characteristic.
分析了正常的人脉搏信号的小波域特征，发现脉搏信号的时域特点严格对应于其小波变换的过零点。
Then it makes use of the crossing points of the zero-crossing fingerprint graph of the curvature to establish the corresponding binary tree.
并利用其曲率函数的零交叉指纹图的交汇点建立相应的二元树。
The results of simulation demonstrate that the precision of correlation method is higher than that of zero crossing method when power system is jammed or has lots of harmonics.
通过仿真表明，当电网信号受到较大干扰或谐波含量较大时，相关法的测量精度比过零检测法高。
LFMCW radar nonlinear residual frequency errors zero crossing detection periodogram.
标签LFMCW雷达非线性剩余频差过零检测周期图。
Result Pulse signal of 20 healthy women and 20 pregnant women were examined by statistic analysis of the time-domain characteristic point zero-crossing position.
结果通过对20例健康人和20例孕妇脉象时域特征点过零点位置的统计及其变化快慢的计算，分析结果正好与实际相吻合。
Based on switch function model of TCSC and MATLAB, the digital simulation method in researching zero-crossing point characteristic of the capacitor voltage is put forward.
该文基于TCSC的开关函数模型并借助MATLAB仿真工具，提出了研究电容电压过零点特性的数字仿真方法。
The stability of the welding arc depends mainly on the voltage and the gas ionization when current zero-crossing as well as the electron emission ability of the electrode.
其电弧稳定与否，主要取决于电流过零瞬间的电弧空间电离度、 电极发射电子能力及再引燃电压的上升速度。
One kind of sensorless control system for brushless DC motor based on DSP was introduced and the principle of back-EMF zero-crossing detection and realization method was discussed in detail.
介绍了反电动势过零位置检测的原理及实现方法，并采用了数字式转速、电流双闭环控制。
The paper processes gray match with the image gray and on the basis of correlative function. The paper processes feature stereo match with zero crossing.
灰度匹配是利用图像的灰度对两幅图像进行立体匹配，以相关函数为判断依据对图像进行立体匹配。
Zero-crossing detector is capable of predicting the shape changes of power spectrum so as to find the newly emerged moving sound sources in ambient noise.
过零检测器可以通过预报功率谱形状的变化来发现环境噪声中新出现的运动声源，研究了过零检测器的检测性能。
Quality square wave power supply, current zero crossing time is short, arc stability, arc without high frequency stability.
优质方波电源，电流过零时间短，电弧稳定，无需高频稳弧。
This thesis illustrates the theory in how interleaving technology solves the problem of input current zero-crossing distortion.
本文对交错技术解决输入电流过零畸变的原理进行了说明。
The proposed system can improve which improving the reliability of communication by zero-crossing spread spectrum technology and active watchdog technology.
该系统采用过零点扩频通信方案大大提高了通信成功率，使用主动式看门狗电路提高系统的电磁兼容性。
They include signal sampling circuit, man-machine interface circuit and control circuit, main chip interface circuit, zero-crossing triggering circuit, and communication circuit, etc.
它们包括信号采样电路、人机接口电路、主控芯片接口电路、过零触发电路及通讯电路等。
Based on the B-Spline theory, this paper present a new kind of multi-scale wavelet transform. The feature of a signal can be extracted in its maximum module or zero-crossing.
本文基于数学样条理论提出了一种新的多尺度小波变换，通过其模极值或零交叉可以有效地提取信号的特征。
Based on the B-Spline theory, this paper present a new kind of multi-scale wavelet transform. The feature of a signal can be extracted in its maximum module or zero-crossing.
本文基于数学样条理论提出了一种新的多尺度小波变换，通过其模极值或零交叉可以有效地提取信号的特征。
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