Screen Capture with OpenCV and Python-2.7

Question

I'm using Python 2.7 and OpenCV 2.4.9.

I need to capture the current frame that is being shown to the user and load it as an cv::Mat object in Python.

Do you guys know a fast way to do it recursively?

I need something like what's done in the example below, that captures Mat frames from a webcam recursively:

import cv2  cap = cv2.VideoCapture(0) while(cap.isOpened()):     ret, frame = cap.read()     cv2.imshow('WindowName', frame)     if cv2.waitKey(25) & 0xFF == ord('q'):         cap.release()         cv2.destroyAllWindows()         break 

In the example it's used the VideoCapture class to work with the captured image from the webcam.

With VideoCapture.read() a new frame is always being readed and stored into a Mat object.

Could I load a "printscreens stream" into a VideoCapture object? Could I create a streaming of my computer's screen with OpenCV in Python, without having to save and delete lots of .bmp files per second?

I need this frames to be Mat objects or NumPy arrays, so I can perform some Computer Vision routines with this frames in real time.

Answer 1

That's a solution code I've written using @Raoul tips.

I used PIL ImageGrab module to grab the printscreen frames.

import numpy as np from PIL import ImageGrab import cv2  while(True):     printscreen_pil =  ImageGrab.grab()     printscreen_numpy =   np.array(printscreen_pil.getdata(),dtype='uint8')\     .reshape((printscreen_pil.size[1],printscreen_pil.size[0],3))      cv2.imshow('window',printscreen_numpy)     if cv2.waitKey(25) & 0xFF == ord('q'):         cv2.destroyAllWindows()         break