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OpenCV 3.3.1, raspberry pi3 model b.

import cv2
image = cv2.imread("beatles.jpg")
gray=cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)
edged = cv2.Canny(image, 10, 250)
(ret, cnts, _) = cv2.findContours(edged.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
idx = 0
for c in cnts:
    x,y,w,h = cv2.boundingRect(c)
    if w>50 and h>50:
        idx+=1
        new_img=image[y:y+h,x:x+w]
        cv2.imwrite(str(idx) + '.png', new_img)
cv2.imshow("im",image)
cv2.waitKey(0)

I do have another roi using mouseevent function