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。
Traditionally, the method of bar code recognition is based on zero crossing of the second derivative.
对利用差谱—二阶导数分光光度法直接测定强干扰基体中微量组分的原理和实验方法进行了探讨。
A new method for determining directly trace component in interfering base by absorbance subtraction -second derivative spectrophotometry is proposed.
本文旨在研究求解非凸约束优化问题的基于二阶导数的微分方程方法。
The aim of the dissertation is to study second order derivatives based differential equation approaches to nonconvex constrained optimization problems.
目前，红细胞边缘形态的检测一般都是利用传统的边缘检测方法，如边缘临近一阶或二阶方向导数法，利用简单的方法来检测边缘。
At present, the methods of edge detection of erythrocyte are using traditional theory such as edge one-order or second-order orient differential coefficient and using simple methods to detect edge.
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。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform (DCT).
拉普拉斯算子的方法是在图像的二阶导数搜索零交叉来查找边缘。
The Laplacian method searches for zero crossings in the second derivative of the image to find edges.
对于R波，采用二级差分和极值方法定位，对QRS波群采用一阶导数与二阶导数并用算法进行检测。
The detection algorithm that adopts tow-level finite difference and extremal theory is used to locate the R wave and the one-level and tow-level derivative methods is used when detect QRS wave.
方法二阶导数差示脉冲极谱法。
METHODS The Secondary derivative differential pulse polarography was developed.
该方法采用微分电路和三采样值运算法，以电流的二阶导数深度抑制非周期分量并提高对采样值的甄别。
The approach utilizes 2-level derivation of secondary current and a 3-sample fitting calculation for decaying DC component depress as well as the sample data identifying.
建立盐酸吡哆辛及其制剂的二阶导数差示脉冲极谱定量分析方法。
A method for the quantitative analysis of the pyridoxine hydrochloride and its preparation were...
经与垂向二阶导数对比分析，证实了该方法给出的模型具有较强的非线性、自适应和学习能力。
It is proved that this model is reliable by analyzing and contrasting structure axis with vertical second staged…
经与垂向二阶导数对比分析，证实了该方法给出的模型具有较强的非线性、自适应和学习能力。
It is proved that this model is reliable by analyzing and contrasting structure axis with vertical second staged…
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