opencv imread读取的是numpy的ndarray类型

显示图片

imshow()

• BGR [W, H, 3]
• 灰度 [W, H]

    winname = 'ref_img'
    cv2.imshow(winname, ref_img.permute(1, 2, 0).numpy()[:, :, ::-1])
    cv2.waitKey(0)

PIL.Image.open.convert('RGB')

图像resize

默认是双线性插值