# Revision history [back]

Python

The OpenCV-Python interface uses NumPy arrays for image objects. So in Python you can do it as follows.

First use cv2.boundingRect to get the bounding rectangle for a set of points (i.e. contours):

x, y, width, height = cv2.boundingRect(contours[i])


You can then use NumPy indexing to get your ROI from the image:

roi = img[y:y+height, x:x+width]


And save the ROI to a new file:

cv2.imwrite("roi.png", roi)