Darknet: Demo needs OpenCV for webcam images.

[ccs1605]

i googled it and searched stackoverflow, and i am unable to find any solutions.

hope to hear you suggestions!

[RushNuts]

Hi. You should opencv =1 in makefile, and make again

[ccs1605]

much appreciate, i follow the readme but didnt see make it again!
it works like charm.

[namtran0110]

sorry, what do you mean by "You should opencv =1 in makefile, and make again"? what's the command line should I run here?

[AlexeyAB]

@namtran0110 You should edit this line in the Makefile file: https://github.com/AlexeyAB/darknet/blob/2c5e383c04655fe45f3f533eb3a69a80acbf3561/Makefile#L4

And then just run command:
make

[Bernardo2282]

I edit the line(OPENCV=1) in the Makefile, but when i run make command i get this error, and the darknet file is deleted, someone help me !!!!

[VanessaMachi]

same with @Bernardo2282 I edit the line(OPENCV=1) in the Makefile and get different error, if use the default(OPENCV=0), it's able to predict image.

[Xaoc000]

Same as above two, would love some more insight into this

[dcguru2016]

Hi,
I am going through the opencv installation for darknet and running into an issue. I spent few hours troubleshooting this to the point that i exhausted all my resources. please help.

---

ubuntu@ubuntu-ThinkPad-X1-Carbon:~/darknet$ make
g++ -Iinclude/ -Isrc/ -DOPENCV pkg-config --cflags opencv -Wall -Wno-unused-result -Wno-unknown-pragmas -Wfatal-errors -fPIC -Ofast -DOPENCV -c ./src/image_opencv.cpp -o obj/image_opencv.o
Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found
./src/image_opencv.cpp:5:10: fatal error: opencv2/opencv.hpp: No such file or directory
#include "opencv2/opencv.hpp"
^~~~~~~~
compilation terminated.
Makefile:86: recipe for target 'obj/image_opencv.o' failed
make: * [obj/image_opencv.o] Error 1
ubuntu@ubuntu-ThinkPad-X1-Carbon:~/darknet$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

import cv2
cv2.__version__
'4.0.0'
quit()
ubuntu@ubuntu-ThinkPad-X1-Carbon:~/darknet$

---

[yustiks]

I have got error when I changed opencv=1 and then run make command.
"No package 'opencv' found
./src/image_opencv.cpp:15:36: fatal error: opencv2/core/version.hpp: No such file or directory
#include "
UPDATE:
Solved the problem by correctly installed opencv. It seems that the ubuntu community has completed the documentation on installing openCV, all you have to do now is to download the installation script from https://github.com/jayrambhia/Install-OpenCV/blob/master/Ubuntu/opencv_latest.sh and execute it.

[sonbkpro]

I have encountered the same error when i try this code with yolo. Please give me a solution on this error. I'm so thanks you.

[ibrandiay]

je rencontre la meme dificulté avec yolov3

[MaheswariR450]

@VanessaMachi... Have you found the solution? please help me with this...I have same issue