t1.py

# Load two images

import numpy as np
import cv2
img1 = cv2.imread('m1.png')
img2 = cv2.imread('opencv_logo.png')

# I want to put logo on top-left corner, So I create a ROI
rows,cols,channels = img2.shape
print(img1.shape)
roi = img1[0:rows, 0:cols]

# Now create a mask of logo and create its inverse mask also
img2gray = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY)
ret, mask = cv2.threshold(img2gray, 10, 255, cv2.THRESH_BINARY)
mask_inv = cv2.bitwise_not(mask)
print(mask)
print(mask_inv)

# Now black-out the area of logo in ROI
img1_bg = cv2.bitwise_and(roi,roi,mask = mask_inv)
cv2.imshow('res',img1_bg)
# Take only region of logo from logo image.
img2_fg = cv2.bitwise_and(img2,img2,mask = mask)

# Put logo in ROI and modify the main image
dst = cv2.add(img1_bg,img2_fg)
img1[0:rows, 0:cols ] = dst


import cv2
import numpy as np

img = cv2.imread('m1.png',0)
rows,cols = img.shape

M = cv2.getRotationMatrix2D((cols/2,rows/2),-90,1)
dst = cv2.warpAffine(img,M,(cols,rows))

cv2.imshow('dst',dst)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.waitKey(0)
cv2.destroyAllWindows()