Ip

import cv2
import math
import numpy as np

img = cv2.imread('lena.jpg')
img_gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
cv2.imshow("input",img_gray)

h=img_gray.shape[0]
w=img_gray.shape[1]

alpha=float(input('Input angle = '))
xc=int(input('xc co = '))
yc=int(input('yc co = '))
rmax=int(input('rmax = '))
alpha=math.radians(alpha)
newimg=img_gray.copy()
# newimg=np.zeros((h,w),img_gray.dtype)

def distance(dy,dx):
    r=math.sqrt(dx*dx+dy*dy)
    return r

for i in range (h):
    for j in range(w):


        dx=i-xc
        dy=j-yc


        r=distance(dy,dx)
        beta=math.atan2(dy,dx)
        beta=beta+alpha*(1-(r/rmax))

        if(rmax>=r):
            x=xc+int(r*math.cos(beta))
            y=yc+int(r*math.sin(beta))
        else:
            x=int(i)
            y=int(j)





        newimg[i,j]=img_gray.item(x,y)



cv2.imshow("output",newimg)
cv2.waitKey(0)
cv2.destroyAllWindows()