python matplotlib 多图像排列显示

用OpenCV和matplotlib实现多图排列，代码如下：

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import cv2 import matplotlib.pyplot as plt   img = cv2.imread('C:\\Users\\admin\\Desktop\\original_img3\\testimg\\lena_300_500.jpg')   plt.subplot(221) plt.title('img1') plt.xticks([])   # remove ticks plt.yticks([]) # The color channel order in matplotlib is [R, G, B] # The color channel order in opencv is [B, G, R] plt.imshow(img[:, :, ::-1])   plt.subplot(222) plt.title('img2') plt.xticks([]) plt.yticks([]) plt.imshow(img[:, :, ::-1])   plt.subplot(223) plt.title('img3') plt.xticks([]) plt.yticks([]) plt.imshow(img[:, :, ::-1])   plt.subplot(224) plt.title('img4') plt.xticks([]) plt.yticks([]) plt.imshow(img[:, :, ::-1])

效果如下：