我想你是想调整和保持纵横比。这里有一个函数可以根据百分比来放大或缩小图像
原始图像示例
将图像大小调整为0.5(50%)
将图像大小调整为1.3(130%)
import cv2
# Resizes a image and maintains aspect ratio
def maintain_aspect_ratio_resize(image, width=None, height=None, inter=cv2.INTER_AREA):
# Grab the image size and initialize dimensions
dim = None
(h, w) = image.shape[:2]
# Return original image if no need to resize
if width is None and height is None:
return image
# We are resizing height if 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)
# We are resizing width if height is none
else:
# Calculate the ratio of the width and construct the dimensions
r = width / float(w)
dim = (width, int(h * r))
# Return the resized image
return cv2.resize(image, dim, interpolation=inter)
if __name__ == '__main__':
image = cv2.imread('1.png')
cv2.imshow('image', image)
resize_ratio = 1.2
resized = maintain_aspect_ratio_resize(image, width=int(image.shape[1] * resize_ratio))
cv2.imshow('resized', resized)
cv2.imwrite('resized.png', resized)
cv2.waitKey(0)
