Python OpenCV convert image to byte string?

If you have an image img (which is a numpy array) you can convert it into string using:

>>> img_str = cv2.imencode('.jpg', img)[1].tostring()
>>> type(img_str)
 'str'

Now you can easily store the image inside your database, and then recover it by using:

>>> nparr = np.fromstring(STRING_FROM_DATABASE, np.uint8)
>>> img = cv2.imdecode(nparr, cv2.CV_LOAD_IMAGE_COLOR)

where you need to replace STRING_FROM_DATABASE with the variable that contains the result of your query to the database containing the image.

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