Question

Im利用Adhurcv2模块操作节目。

我能够访问封建的网络运动,但当我利用外部网络作风时,它就没有工作。

我使用了所有法典。

VideoCapture(1) # or any other no.s like 0,1,2,3 etc etc.

我甚至还利用装置经理使内在设计的网络广告失效。

但无所作为。 I m 使用 p。我也迅速进行了指挥。它依然没有工作。

我发现以下错误:

runfile( C:/Users/Prashant/Documents/Python Scripts/Circledetection.py ,     wdir=r C:/Users/Prashant/Documents/Python Scripts )
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in unknown function, file ......modulesimgprocsrccolor.cpp, line 3402
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:Python27libsite-packagesspyderlibwidgetsexternalshellsitecustomize.py", line 540, in runfile
    execfile(filename, namespace)
  File "C:/Users/Prashant/Documents/Python Scripts/Circledetection.py", line 27, in <module>
    prev_gray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
cv2.error: ......modulesimgprocsrccolor.cpp:3402: error: (-215) scn == 3 || scn == 4

Answer 1

That assertion means that your image does not have 3 (RGB, BGR, etc) channels, or 4 channels (3 channels + alpha). This can be caused, obviously, by the image not existing at all.

虽然这可能是因为你的照相机是徒劳的,但同样可能的是,你的照相机不会给头几读(......)的可用框架,因为它仍在准备之中。

The easiest way to solve this, assuming you use something like retv, frame = cam.read() is to check if frame: or if retv:.

如果没有图像,它是否绕过你的处理,在几个框架内,你应该有可读的投入。

Answer 2

You mentioned VideoCapture(0) to VideoCapture(1).
"1" means external camera number.

import cv2
import numpy as np

cap = cv2.VideoCapture(1) 
while(1):
    ret, frame = cap.read()
    #print(height)
    #cv2.imshow("Cropped Image", crop_img)
    #gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    cv2.imshow( frame ,frame)
    if cv2.waitKey(1) & 0xFF == ord( q ):
        break

cap.release()
cv2.destroyAllWindows()

Answer 3

你们是否保证使用正确的指数? 用户也可使用<代码>Videocapture>,因为外部广告有时是输入清单的最后内容。也可以归还装置名称,因此,你可以试图查阅输入装置指数清单,并打印其“友好名称”,以确保你使用正确的名称。

Answer 4

OpenCV requires the following dependencies to work with the USB cameras. Install the dependencies from the following commands:

校准视频投入/产出开发图书馆

sudo apt-get install libavformat-dev libavutil-dev libswscale-dev

Video4Linux camera development libraries
```
sudo apt-get install libv4l-dev
```
OpenGL development libraries (to allow creating graphical windows)
```
sudo apt-get install libglew-dev
```
GTK development libraries (to allow creating graphical windows)
```
sudo apt-get install libgtk2.0-dev
```

Answer 5

它为我工作。

开放式电脑要求以下附属公司与USB照相机合作。全部来自以下指挥单位:

校准视频投入/产出开发图书馆

sudo apt-get install libavformat-dev libavutil-dev libswscale-dev Video4Linux camera development libraries

sudo apt-get install libv4l-dev OpenGL development libraries (to allow creating graphical windows)

sudo apt-get install libglew-dev GTK development libraries (to allow creating graphical windows)

sudo aptgetstalgtk2.0-dev

Answer 6

您可以尝试安装虚拟环境:

pip install virtualenv

然后:

python -m virtualenv .

接着实施你 p的节目:

cv2.VideoCapture(0)

友情链接