animation/fourcell/notes/affine_poc3.py

import cv2
import numpy as np
import os

def combine_images (bg, fg, mask) :
	fk = cv2.bitwise_or(fg, fg, mask=mask)
	mask = cv2.bitwise_not(mask)
	bk = cv2.bitwise_or(bg, bg, mask=mask)
	return cv2.bitwise_or(fk, bk)

username = os.getlogin()

#outer template
outer = cv2.imread(f"/home/{username}/Desktop/running/shot1-scans/image-2-normal.png")
outer = cv2.cvtColor(outer, cv2.COLOR_BGR2BGRA)
#inner image
inner = cv2.imread(f"/home/{username}/Desktop/frame.jpg")
inner = cv2.cvtColor(inner, cv2.COLOR_BGR2BGRA)

rows, cols, ch = outer.shape
ir, ic, ich = inner.shape

print(f'{cols}x{rows}')
print(f'{ic}x{ir}')

# destination ponts on outer image
pts1 = np.float32([[1445, 11429], [1445, 6832], [5009, 11429]])

# corresponding points on inner image
pts2 = np.float32([[0, 0], [ic, 0], [0, ir]])

# transform inner to points on outer
M = cv2.getAffineTransform(pts2, pts1)

# apply
dst = cv2.warpAffine(inner, M, (cols, rows),
	flags = cv2.INTER_CUBIC, 
	borderMode = cv2.BORDER_CONSTANT, 
	borderValue = [0, 0, 0, 0]
)

lower = np.array([0,0,0,0])
upper= np.array([0,0,0,0])

# Create a mask. Threshold the HSV image to get only yellow colors
mask = cv2.inRange(dst, lower, upper)
mask = cv2.bitwise_not(mask)

final = combine_images(outer, dst, mask)
final = cv2.cvtColor(final, cv2.COLOR_BGRA2BGR)
cv2.imwrite("affine_poc3.png", final)