如何从Python CV2,Scikit Image和Mahotas中读取从互联网URL的图像?
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26-12-2019 - |
题
如何从Python CV2中的Internet URL读取图像?
这个堆栈溢出答案,
import cv2.cv as cv
import urllib2
from cStringIO import StringIO
import PIL.Image as pil
url="some_url"
img_file = urllib2.urlopen(url)
im = StringIO(img_file.read())
.
不好,因为python向我报告:
TypeError: object.__new__(cStringIO.StringI) is not safe, use cStringIO.StringI.__new__
. 解决方案
由于CV2图像不是字符串(保存Unicode One,Yucc),但是numpy array, - 使用cv2和numpy来实现它:
import cv2
import urllib
import numpy as np
req = urllib.urlopen('http://answers.opencv.org/upfiles/logo_2.png')
arr = np.asarray(bytearray(req.read()), dtype=np.uint8)
img = cv2.imdecode(arr, -1) # 'Load it as it is'
cv2.imshow('lalala', img)
if cv2.waitKey() & 0xff == 27: quit()
. 其他提示
下面将图像直接读入numpy数组:
from skimage import io
image = io.imread('https://raw2.github.com/scikit-image/scikit-image.github.com/master/_static/img/logo.png')
. 在Python3:
from urllib.request import urlopen
def url_to_image(url, readFlag=cv2.IMREAD_COLOR):
# download the image, convert it to a NumPy array, and then read
# it into OpenCV format
resp = urlopen(url)
image = np.asarray(bytearray(resp.read()), dtype="uint8")
image = cv2.imdecode(image, readFlag)
# return the image
return image
.
这是在imutils中实现URL_TO_IMAGE,所以您可以拨打
import imutils
imutils.url_to_image(url)
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