[Python] Download image with selenium python

I want get captcha image from browser. I have got a url of this picture, but the this picture changes each updated time (url is constant).

Is there any solution to get picture from browser (like 'save picture as' button)?

From the other hand, I think it should be work:

1. get screenshot of the browser
2. get position of picture
3. crop captcha from screenshot using opencv

link of the dynamic capcha - link

The problem was solved via screenshot:

browser.save_screenshot('screenshot.png')
img = browser.find_element_by_xpath('//*[@id="cryptogram"]')
loc = img.location

image = cv.LoadImage('screenshot.png', True)
out = cv.CreateImage((150,60), image.depth, 3)
cv.SetImageROI(image, (loc['x'],loc['y'],150,60))
cv.Resize(image, out)
cv.SaveImage('out.jpg', out)


Thanks

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