没有视频输出OpenCV Python [英] No video output OpenCV Python
本文介绍了没有视频输出OpenCV Python的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想将我的代码转换为视频。我的程序接收一个图像,计算每个9 * 9窗口的平均RGB并输出一个图像:
I am trying to convert my code that works on images to video. My program takes in an image, works out the mean RGB of each 9*9 window and outputs an image:
输入图像:
Input Image:
输出图片:
Output Image:
这是我的代码有一个图像作为输入/输出:
Here is my code that has an image as input/output:
import numpy as np
import cv2
#Read in image
img = cv2.imread('images/0021.jpg')
scale = 9
#Get x and y components of image
y_len,x_len,_ = img.shape
mean_values = []
for y in range(scale):
for x in range(scale):
#Crop image 3*3 windows
cropped_img=img[(y*y_len)/scale:((y+1)*y_len)/scale,
(x*x_len)/scale:((x+1)*x_len)/scale]
mean_val=cv2.mean(cropped_img)
mean_val=mean_val[:3]
cropped_img[:,:,:] = mean_val
print img.shape
cv2.imshow('mean_RGB',img)
cv2.waitKey(0)
b $ b
当试图在视频上使用相同的代码时,我得到一个视频输出,但它是空的(0字节)。
When trying to use the same code on a video I get a video output but it is empty (0 bytes).
这里是代码:
import numpy as np
import cv2
cap = cv2.VideoCapture('videos/kondo2.avi')
fourcc = cv2.cv.CV_FOURCC(*'DIVX')
out = cv2.VideoWriter('videos/output.avi',fourcc, 15.0, (800,600),True)
while(cap.isOpened()):
ret, frame = cap.read()
if ret == True:
y_len,x_len,_ = frame.shape
scale = 9
for y in range(scale):
for x in range(scale):
cropped_frame=frame[(y*y_len)/scale:((y+1)*y_len)/scale,
(x*x_len)/scale:((x+1)*x_len)/scale]
mean_val=cv2.mean(cropped_frame)
mean_val=mean_val[:3]
cropped_frame[:,:,:] = mean_val
out.write(frame)
cap.release()
out.release()
cv2.destroyAllWindows()
谢谢阅读:)
推荐答案
我试过你的代码。我必须改变三件事:
I tried your code. Three things I had to change:
- 输出视频的编解码器。
- 调整输入框的大小,只是为了调整输入框的大小。
以下是适合我的方法:
import numpy as np
import cv2
cap = cv2.VideoCapture('videos/kondo2.avi')
w=800
h=600
fourcc = cv2.cv.CV_FOURCC('m', 'p', '4', 'v')
out = cv2.VideoWriter('videos/output.avi',fourcc, 25, (w,h),True)
count = 0
while(cap.isOpened()):
count = count + 1
print "processing frame ", count
ret, frame = cap.read()
if ret == True:
frame = cv2.resize(frame,(w,h), interpolation = cv2.INTER_CUBIC)
y_len,x_len,_ = frame.shape
scale = 9
for y in range(scale):
for x in range(scale):
cropped_frame=frame[(y*y_len)/scale:((y+1)*y_len)/scale,
(x*x_len)/scale:((x+1)*x_len)/scale]
mean_val=cv2.mean(cropped_frame)
mean_val=mean_val[:3]
cropped_frame[:,:,:] = mean_val
out.write(frame)
cap.release()
out.release()
cv2.destroyAllWindows()
这篇关于没有视频输出OpenCV Python的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文