#Example code showing the use of slicing operators to copy regions
#of one image into another.
#
#Jay Summet - Summet 2015
#
# OpenCV 2.4.x, Python 2.7
import cv2

#Because the color channels are the last "dimension", 2D slicing will 
#also automatically copy all 3 color channels.
#
a = cv2.imread("blueSky.jpg", cv2.IMREAD_GRAYSCALE)
b = cv2.imread("holes.jpg", cv2.IMREAD_GRAYSCALE)

#Copy a region from B into A:
# a[133:367, 416:605] = b[133:367, 416:605]

#Copy the same region using variables...
xPos = 416
width = 189

yPos = 133
height = 234

a[yPos:yPos+height, xPos:xPos+width] = b[yPos:yPos+height, xPos:xPos+width]

#Copy it into a NEW position!
newY = 0
newX = 0

a[newY:newY+height, newX:newX+width] = b[yPos:yPos+height, xPos:xPos+width]


cv2.imshow("Copy Rectangle", a)
cv2.waitKey(0)