Mirror implementation method in python

Mirroring changes to the image do not change the shape of the image. There are three types of mirror transformations of images: horizontal mirroring, vertical mirroring, and diagonal mirroring

Suppose the size of the image is M×N, then

Horizontal mirroring can be done according to the formula

I = i

J = N - j + 1

The vertical mirror can be calculated according to the formula

I = M - i + 1

J = j

The diagonal mirror can be calculated according to the formula

I = M - i + 1

J = N - j + 1

It is worth noting that in OpenCV The coordinates start from [0,0]

So, the +1 in the formula needs to be changed to -1 when programming

#The running environment here is:

Python is: Python2.7.6
OpenCV2.4.10 version
numpy is: numpy-1.9.1-win32-superpack-python2.7

The following The code still takes baby pictures as an example. The specific procedure is as follows:

import cv2.cv as cv
image = cv.LoadImage('angelababy.jpg',1)
size = (image.width,image.height)
iUD = cv.CreateImage(size,image.depth,image.nChannels)
iLR = cv.CreateImage(size,image.depth,image.nChannels)
iAcross = cv.CreateImage(size,image.depth,image.nChannels)
h = image.height
w = image.width
for i in range(h):
  for j in range(w):
    iUD[h-1-i,j] = image[i,j]
    iLR[i,w-1-j] = image[i,j]
    iAcross[h-1-i,w-1-j] = image[i,j]
cv.ShowImage('image',image)
cv.ShowImage('iUD',iUD)
cv.ShowImage('iLR',iLR)
cv.ShowImage('iAcross',iAcross)
cv.WaitKey(0)

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