对齿轮图像进去噪、灰度化、二值化等一系列处理，通过拟合齿轮边缘曲线，可以获取齿轮边缘曲线的数学方程，从而获取齿轮间距。(For the gear image into the noise, grayscale, binarization and a series of processing, by fitting the gear edge curve, you can get the gear edge curve of the mathematical equation, in order to obtain gear spacing)