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4. Watermark.py
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4. Watermark.py
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import numpy as np
import cv2
from utilities import image_resize
w_icon = cv2.imread('images/watermark/icon.png', -1)
watermark = image_resize(w_icon, height=50)
watermark = cv2.cvtColor(watermark, cv2.COLOR_BGR2BGRA)
#cv2.imshow('watermark', watermark)
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
# Adjusting frame Colors type to be the same as Overlay
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2BGRA)
color = (255,0,0)
bold = 2
start_cord_x = 50
start_cord_y = 150
rectangle_width = 100
rectangle_height = 200
end_cord_x = start_cord_x + rectangle_width
end_cord_y = start_cord_y + rectangle_height
cv2.rectangle(frame, (start_cord_x,start_cord_y), (end_cord_x, end_cord_y),
color, bold)
frame_height, frame_width, frame_channels = frame.shape
# if frame in grayscale, frame.shape do not returns frame_channels
# Overlay - 4 channels BGR and Aplha
overlay = np.zeros((frame_height, frame_width, 4), dtype='uint8')
overlay[100:250, 100:125] = (255,0,0,1) # B,G,R,Alpha
watermark_height, watermark_width, watermark_channels = watermark.shape
for i in range(0, watermark_height):
for j in range(0, watermark_width):
if watermark[i,j][3] != 0:
height_offset = frame_height - watermark_height - 10
width_offset = frame_width - watermark_width - 10
overlay[height_offset + i, width_offset + j] = watermark[i,j]
# Adding overlay - new on frame
cv2.addWeighted(overlay, 0.25, frame, 1.0, 0, frame)
#print(frame[start_cord_x:end_cord_x, start_cord_y:end_cord_y])
cv2.imshow('frame', frame)
if cv2.waitKey(20) & 0xFF == ord('q'):
break
cap.release()
out.release()
cv2.destroyAllWindows()
# To add watermark I've created an overlay with exactly
# same size as frame, and replaced it's part with a
# watermark icon.