我想根据百分比调整图像大小,并使其与原始图像保持接近,从而将噪声和失真降至最低。调整大小可能会变大或变小,因为我可以将大小调整为原始图像的5%或500%(或任何其他值作为示例)
这是我尝试过的方法,我需要在调整大小后的图像中进行绝对最小的更改,因为与其他图像相比,我将使用它
def resizing(main,percentage):
main = cv2.imread(main)
height = main.shape[ 0] * percentage
width = crop.shape[ 1] * percentage
dim = (width,height)
final_im = cv2.resize(main, dim, interpolation = cv2.INTER_AREA)
cv2.imwrite("C:\\Users\\me\\nature.jpg", final_im)
答案 0 :(得分:1)
我认为您正在尝试调整尺寸和保持宽高比。这是一个根据百分比对图像进行放大或缩小的功能
原始图片示例
将图片大小调整为0.5(50%)
将图片调整为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)
答案 1 :(得分:0)
您可以使用cv2.resize
的以下语法:
cv2.resize(image,None,fx=int or float,fy=int or float)
fx
取决于宽度
fy
取决于高度
您可以输入第二个参数None
或(0,0)
示例:
img = cv2.resize(oriimg,None,fx=0.5,fy=0.5)
注意:
0.5表示要缩放图像的50%