[英]OpenCV is too slow for this
我想將網絡攝像頭捕獲的視頻疊加在另一個實時視頻上。 所以我嘗試了上面的代碼,但它太慢了。
我應該切換到另一種語言或 lib 還是什么?
任何建議或幫助將不勝感激。
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()
要求是將網絡攝像頭實時視頻平滑地覆蓋在底部的另一個視頻上。
謝謝。
基本上,如果您希望它更快,您可能不會使用 python 循環迭代圖像。 您正在嘗試使用 2 個嵌套循環將按比例縮小的圖像復制到空疊加層中,這非常慢。 我不明白這個條件
if watermark[i,j][3] != 0:
還有這部分:
offset = 0
h_offset = frame_h - watermark_h -offset
w_offset = frame_w - watermark_w - offset
應該脫離循環——它們都是常數。
但最重要的是,您可以執行以下操作,而不是在圖像上循環:
offset[h_offset:h_offset+watermark_h,w_offset:w_offset+watermark_w] = watermark
在此之后,我從 9 fps 提高到 28 fps。
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