Python OpenCV convert image to byte string?

Question

I\'m working with PyOpenCV. How to convert cv2 image (numpy) to binary string for writing to MySQL db without a temporary file and imwrite?

I googled it

Answer 1

My code to use opencv with python cgi :

    im_data = form['image'].file.read()
    im = cv2.imdecode( np.asarray(bytearray(im_data), dtype=np.uint8), 1 )
    ret, im_thresh = cv2.threshold( im, 128, 255, cv2.THRESH_BINARY )
    self.send_response(200)
    self.send_header("Content-type", "image/jpg")
    self.end_headers()      
    ret, buf = cv2.imencode( '.jpg', im_thresh )
    self.wfile.write( np.array(buf).tostring() )