cv2.imread('yan.jpg', cv2.IMREAD_GRAYSCALE)

cv2.imread('yan.jpg', cv2.IMREAD_GRAYSCALE)是一个OpenCV函数，用于以灰度模式读取图像文件'yan.jpg'。这个函数将图像文件转换为灰度图像，即每个像素的数值表示灰度级别。在这个函数中，'yan.jpg'是要读取的图像文件的路径，cv2.IMREAD_GRAYSCALE是指定读取图像的模式，表示以灰度模式读取图像。
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