opencv python使用一个常量调整大小

我知道你只要求cv2.resize,但是你可以使用 imutils 为您做一些比率代码的库。

import imutils
resized = imutils.resize(img, width=newwidth)

在imutils内部:

dim = None
(h, w) = image.shape[:2]

# check to see if the width is None
if width is None:
    # calculate the ratio of the height and construct the
    # dimensions
    r = height / float(h)
    dim = (int(w * r), height)

# otherwise, the height is None
else:
    # calculate the ratio of the width and construct the
    # dimensions
    r = width / float(w)
    dim = (width, int(h * r))

# resize the image
resized = cv2.resize(image, dim, interpolation=inter)

您可以使用 fx 和 fy 的参数 resize 功能。

img = cv2.resize(img, (0,0), fx=500/400, fy=500/400)