How can I read an image from a url with cv2.imread? I am able to do it with SimpleCV, but it is rather bulky just to do an image read.
I would like to achieve something like:
im = cv2.imread("http://example.com/someimage.jpg")
imread can't read from urls, but videocapture can !
cap = cv2.VideoCapture("http://example.com/someimage.jpg")
if( cap.isOpened() ) :
ret,img = cap.read()
cv2.imshow("win",img)
cv2.waitKey()Thanks that works, but it is slower than using:
from SimpleCV import Image img = Image("http://example.com/someimage.jpg")
For one thing I am getting the below warnings:
Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
Looking it up now, thought I'd post here in parallel.
Actually I forgot to comment out the from SimpleCV import Image line. When I did that, the speeds are comparable. If I already have the image local and use cv2.imread, I get 200ms back when processing the image. My goal is to get pretty close to that.
Not sure what they are doing, guess I have some homework!
SimpleCV uses urllib2.Request to fetch the data, and uses StringIO and PIL to convert image.
https://gist.github.com/jayrambhia/5973156 (Manage the imports :))
@berak@jayrambhia Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
The code that is triggering this is below. If I pass in a local jpeg it is clean, when I pas in a url of the jpeg, I get the above.
link = sys.argv[1] cap = cv2.VideoCapture(link) if( cap.isOpened() ): ret, im = cap.read()
Any ideas how to clean this up?
Asked: Jul 9 '13
Seen: 14,222 times
Last updated: Jul 09 '13
