实现24位RGB彩色图像，先转化为灰度图像，而后用大津法实现二值化，并显示阀值。-To achieve 24-bit RGB color images, the first converted to grayscale images, then using Otsu binarization method to achieve and display threshold.

实现彩色图像灰度化，迭代法实现灰度图像二值化-To achieve gray-scale color images of, iterative method to achieve gray-scale image binarization