And smoothing the picture in order to getting rid of the noise which is produced by gathering and transmitting, so that we can detect the edge easily.
并对图像进行平滑处理，去除图像采集和传输中混入的噪声，以利于图像的边缘检测。
When the speed pulse signal is provided, a calculation of the speed curve is achieved using first order digital differential method and the lease square of five points three times smoothing approach.
对于有转速脉冲信号的情况，实现了基于一阶数字微分和最小二乘五点三次平滑方法的转速曲线计算方法。
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