I want to overlay webcam captured video on another video in live. So I have tried the above code,but it's too slow.
Should I shift to another language or lib or something?
Any suggestion or help will be appreciated.
import numpy as np
from cv2 import cv2
def image_resize(image, width = None, height = None, inter = cv2.INTER_AREA):
# initialize the dimensions of the image to be resized and
# grab the image size
dim = None
(h, w) = image.shape[:2]
# if both the width and height are None, then return the
# original image
if width is None and height is None:
return image
# check to see if the width is None
if width is None:
# calculate the ratio of the height and construct the
# dimensions
r = height / float(h)
dim = (int(w * r), height)
# otherwise, the height is None
else:
# calculate the ratio of the width and construct the
# dimensions
r = width / float(w)
dim = (width, int(h * r))
# resize the image
resized = cv2.resize(image, dim, interpolation = inter)
# return the resized image
return resized
cap2 = cv2.VideoCapture('http://192.168.43.1:8080/video')
cap = cv2.VideoCapture('test.mp4')
# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('sample3.mp4',fourcc,30, (640,480))
# watermark = logo
# cv2.imshow("watermark",watermark)
while(cap.isOpened()):
ret, frame = cap.read()
frame = cv2.cvtColor(frame,cv2.COLOR_BGR2BGRA)
ret2 ,frame2 = cap2.read()
frame2 = cv2.cvtColor(frame2,cv2.COLOR_BGR2BGRA)
watermark = image_resize(frame2,height=177)
if ret==True:
frame_h, frame_w, frame_c = frame.shape
overlay = np.zeros((frame_h, frame_w, 4), dtype='uint8')
overlay[543:543+177,1044:1044+236] = watermark
cv2.addWeighted(frame, 0.25, overlay, 1.0, 0, frame)
frame = cv2.cvtColor(frame,cv2.COLOR_BGRA2BGR)
out.write(frame)
cv2.imshow('frame',frame)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
else:
break
# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()
Requirement is to overlay webcam live video on another video at bottom smoothly.
Thanks.
Basically, if you want it to be fast, you may not iterate over an image using a python cycle. You are trying to copy the scaled-down image into the empty overlay using 2 nested cycles and that's terribly slow. I do not understand the condition
if watermark[i,j][3] != 0:
Also this part:
offset = 0
h_offset = frame_h - watermark_h -offset
w_offset = frame_w - watermark_w - offset
should be out of the cycle - they are all constants.
But most importantly instead of cycling over the image you can do:
offset[h_offset:h_offset+watermark_h,w_offset:w_offset+watermark_w] = watermark
After this, I am up from 9 fps to 28 fps.