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。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform (DCT).
基于离散余弦变换(DCT)的重力异常垂向二阶导数的计算方法是笔者提出的新方法。
Design of output asymptotic tracking for a class of descriptor second-order dynamical systems based on output plus derivative feedback is considered.
考虑了基于输出及其微分反馈的广义二阶动力学系统输出渐近跟踪设计。
The automatic peak-seeking algorithm was based on the covariance and second derivative.
通过协方差法和二阶求导法实现了光谱峰位的自动检测；
The automatic peak-seeking algorithm was based on the covariance and second derivative.
通过协方差法和二阶求导法实现了光谱峰位的自动检测；
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