Question

python- please finish the three programs, where one flips an image horizonally, then vertically, and one that rotates an image by 90 degrees. please don't use the functions .mirror() .flip() or .rotate() if possible. thanks

def horizontal(image):
"""Flip the specified image left to right and return the modified image"""

return img

def vertical(image):
"""Flip the specified image upside down and return the modified image"""

  
return image

def rotate_90(image):
"""Rotate the specified image 90 degrees to the right and return the modified image"""

  
return image

Answer 1

• Inorder to do a horizontal flip, follow this process.
  • create a numpy array with same shape as the image.
  • move all the columns of image to the numpy array in reverse order
  • return the numpy array
• Inorder to do a vertical flip, follow this process.
  • create a numpy array with same shape as the image.
  • move all the rows of image to the numpy array in reverse order
  • return the numpy array
• Inorder to rotate right, followe this process.
  • create a numpy array, whose number of rows is number of columns in image and whose number of rows is number of columns in image.
  • copy all the rows in image and assign them to columns in the array in reverse order.
  • return the array

fucntions:

import numpy as np
import cv2

def horizontal(image):
image2 = np.zeros([image.shape[0], image.shape[1], image.shape[2]], np.uint8);
for i in range(image.shape[1]):
image2[:,i] = image[:,image.shape[1]-i-1]

return image2

def vertical(image):
image2 = np.zeros([image.shape[0], image.shape[1], image.shape[2]], np.uint8);
for i in range(image.shape[0]):
image2[i,:] = image[image.shape[0]-i-1,:]

return image2

def rotate(image):
h,w,c = img.shape
image2 = np.zeros([w,h,c], dtype=np.uint8)
for i in range(h):
image2[:,h-i-1] = image[i,:]
return image2

outputs:

original image:

1.) horizantial flip.

funtion call:

img = cv2.imread("img1.png")
horflip = horizontal(img)
cv2.imshow(" horizontal flip",horflip)
cv2.waitKey(0)
cv2.destroyAllWindows()

2.) vertical flip:

funtion call:

img = cv2.imread("img1.png")
horflip = vertical(img)
cv2.imshow(" vertical flip",horflip)
cv2.waitKey(0)
cv2.destroyAllWindows()

3.) rotate right

function call:

img = cv2.imread("img1.png")
horflip = rotate(img)
cv2.imshow("rotate right",horflip)
cv2.waitKey(0)
cv2.destroyAllWindows()