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。

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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。

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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。

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"This is for all of the gentlemen of a certain age, " he said after crossing the finish line in temperatures just above zero.

NPR: 53-Year-Old Musher Becomes Oldest Iditarod Champ

"I think he needs to add a zero to it, " Lynn Sarko , a lawyer representing Global Crossing (otc: GBLXQ - news - people ) workers, told Reuters, adding that the amount was less than one-tenth of the losses Global Crossing employees had suffered.

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