OTSU算法也称最大类间差法，有时也称之为大津算法，被认为是图像分割中阈值选取的最佳算法，计算简单，不受图像亮度和对比度的影响，因此在数字图像处理上得到了广泛的应用。它是按图像的灰度特性,将图像分成背景和前景两部分.(Difference method OTSU algorithm called maximum class, sometimes called the Otsu algorithm, is considered to be the best algorithm, threshold image segmentation method is simple and is not affected by the image brightness and contrast, so it has been widely used in digital image processing. It divides the image into two parts: background and foreground according to the gray character of image.



The maximum value of the above expression is t, which is the best threshold of the segmented image.)