Darknet: ./src/image_opencv.cpp:5:10: fatal error: opencv2/opencv.hpp: No such file or directory

Created on 25 Oct 2019 · 21Comments · Source: pjreddie/darknet

rico@deadsecuritylab:~/Desktop/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
5 | #include "opencv2/opencv.hpp"
| ^~~~~~~~
compilation terminated.
make: * [Makefile:86: obj/image_opencv.o] Error 1

Source

Liquid72

Most helpful comment

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

kevinjosue2326 on 30 Oct 2019

👍23 ❤12

All 21 comments

I"m having this issue as well

minyoungk99 on 28 Oct 2019

which opencv version are you using?

CaptianFluffy100 on 29 Oct 2019

4.1.0
SOmeone suggested maybe theres a opencv version for C and another for python? IS that possible?

minyoungk99 on 29 Oct 2019

I use Opencv 4.0.0 I had that problem with 4.1.1. Newer versions on Opencv have bugs.
Follow this guys directions, but instead of master, use 4.0.0.

This is assuming you are using Ubuntu as your OS.

CaptianFluffy100 on 29 Oct 2019

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

kevinjosue2326 on 30 Oct 2019

👍23 ❤12

I tried using 4.0.0 and 3.4.7, same error.

minyoungk99 on 30 Oct 2019

If you have another version installed, uninstall the version you have and follow these steps:
Remember to have pip installed in ubuntu. I tried this on Ubuntu 18.04 - 64 Bits
pip install opencv-python == 4.1.1.26

and later

sudo apt install libopencv-dev

kevinjosue2326 on 31 Oct 2019

👎2 👍1

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

this was a big saver for me!! thank you

renzhere on 9 Dec 2019

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

This was the solution for me. Thank you!

EduardoABarrera on 21 Feb 2020

Im having the same issue , i installed libopencv-dev but still having make error

juliangdz on 30 Mar 2020

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

@kevinjosue2326
I tried these instructions after installing jdk on my mac
it throws me this error:

Unable to locate an executable at "/Library/Java/JavaVirtualMachines/jdk-14.0.1.jdk/Contents/Home/bin/apt" (-1)

I am trying to run YOLO on my webcam. When I changed OPENCV = 1 in the Makefile and I am facing the same issue as @Ricftrw .

I am new to this, so kindly help me

kesav-r on 23 Apr 2020

@kesav-r , you have managed to solve your problem. if not let me know, to help you I would like to know what version of ubuntu you are using and if you are using Yolo in standard version or GPU version.??

kevinjosue2326 on 21 May 2020

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command
sudo apt install libopencv-dev
let me know if it works for you

@kevinjosue2326
I tried these instructions after installing jdk on my mac
it throws me this error:

Unable to locate an executable at "/Library/Java/JavaVirtualMachines/jdk-14.0.1.jdk/Contents/Home/bin/apt" (-1)

I am trying to run YOLO on my webcam. When I changed OPENCV = 1 in the Makefile and I am facing the same issue as @Ricftrw .

I am new to this, so kindly help me

Hey I have the same issue did you find out any solution?

yudhiesh on 23 May 2020

Just inside of Makefile

change

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv` -lstdc++
COMMON+= `pkg-config --cflags opencv` 
endif

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv4` -lstdc++
COMMON+= `pkg-config --cflags opencv4` 
endif

after that you'll have this problem: ./src/image_opencv.cpp:12:1: error: ‘IplImage’ does not name a type; did you mean ‘image’?

but you can solve it using the solution https://github.com/pjreddie/darknet/issues/1347#issuecomment-472530377

in file ./src/image_opencv.cpp

add these two functions

Mat image_to_mat(image im)
{
image copy = copy_image(im);
constrain_image(copy);
if(im.c == 3) rgbgr_image(copy);

Mat m(cv::Size(im.w,im.h), CV_8UC(im.c));
int x,y,c;

int step = m.step;
for(y = 0; y < im.h; ++y){
    for(x = 0; x < im.w; ++x){
        for(c= 0; c < im.c; ++c){
            float val = im.data[c*im.h*im.w + y*im.w + x];
            m.data[y*step + x*im.c + c] = (unsigned char)(val*255);
        }
    }
}

free_image(copy);
return m;

}

image mat_to_image(Mat m)
{

int h = m.rows;
int w = m.cols;
int c = m.channels();
image im = make_image(w, h, c);
unsigned char *data = (unsigned char *)m.data;
int step = m.step;
int i, j, k;

for(i = 0; i < h; ++i){
    for(k= 0; k < c; ++k){
        for(j = 0; j < w; ++j){
            im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
        }
    }
}
rgbgr_image(im);
return im;

}

AFTER THAT REMOVE THESE THREE FUNCTIONS

/*
IplImage *image_to_ipl(image im)
{
    int x,y,c;
    IplImage *disp = cvCreateImage(cvSize(im.w,im.h), IPL_DEPTH_8U, im.c);
    int step = disp->widthStep;
    for(y = 0; y < im.h; ++y){
        for(x = 0; x < im.w; ++x){
            for(c= 0; c < im.c; ++c){
                float val = im.data[c*im.h*im.w + y*im.w + x];
                disp->imageData[y*step + x*im.c + c] = (unsigned char)(val*255);
            }
        }
    }
    return disp;
}

image ipl_to_image(IplImage* src)
{
    int h = src->height;
    int w = src->width;
    int c = src->nChannels;
    image im = make_image(w, h, c);
    unsigned char *data = (unsigned char *)src->imageData;
    int step = src->widthStep;
    int i, j, k;

    for(i = 0; i < h; ++i){
        for(k= 0; k < c; ++k){
            for(j = 0; j < w; ++j){
                im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
            }
        }
    }
    return im;
}

Mat image_to_mat(image im)
{
    image copy = copy_image(im);
    constrain_image(copy);
    if(im.c == 3) rgbgr_image(copy);

    IplImage *ipl = image_to_ipl(copy);
    Mat m = cvarrToMat(ipl, true);
    cvReleaseImage(&ipl);
    free_image(copy);
    return m;
}

image mat_to_image(Mat m)
{
    IplImage ipl = m;
    image im = ipl_to_image(&ipl);
    rgbgr_image(im);
    return im;
}*/

and remove all CV_ from opencv flags, for example:

    if(w) cap->set(CV_CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CV_CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CV_CAP_PROP_FPS, w);

    if(w) cap->set(CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CAP_PROP_FPS, w);

y9luiz on 30 Jun 2020

❤7 👍6

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra opencv package with the following command

sudo apt install libopencv-dev

let me know if it works for you

It's very useful ，thanks

OneDirection67 on 11 Jul 2020

Hello friends, I have solved my problem in Ubuntu only by additionally installing the extra OpenCV package with the following command

sudo apt install libopencv-dev

let me know if it works for you

I tried this but i am still getting the same issue. My OpenCV version is 4.2.0 and I have sent my PKG_CONFIG_PATH=/usr/include/opencv4/opencv2 which contains opencv.hpp. What should i do? should i change the path variable to /usr/local/lib which contains opencv.pc which i created as suggested here https://prateekvjoshi.com/2013/10/18/package-opencv-not-found-lets-find-it/

libopencv-dev is already to the newest version (4.2.0+dfsg-2).

AdityaKabu on 22 Jul 2020

@kesav-r , you have managed to solve your problem. if not let me know, to help you I would like to know what version of ubuntu you are using and if you are using Yolo in standard version or GPU version.??

A different user here, i was using Ubuntu 20.04 LTS however it is a VM

AdityaKabu on 22 Jul 2020

I am having the same issue and none of the solutions worked for me.
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
./src/image_opencv.cpp:5:10: fatal error: opencv2/opencv.hpp: No such file or directory
5 | #include "opencv2/opencv.hpp"
| ^~~~~~~~
compilation terminated.
make: * [Makefile:86: obj/image_opencv.o] Error 1

nakul-shahdadpuri on 3 Aug 2020

If you have another version installed, uninstall the version you have and follow these steps:
Remember to have pip installed in ubuntu. I tried this on Ubuntu 18.04 - 64 Bits
pip install opencv-python == 4.1.1.26

and later

sudo apt install libopencv-dev

be useful for me

ArvinCharl on 26 Aug 2020

Just inside of Makefile

change

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv` -lstdc++
COMMON+= `pkg-config --cflags opencv` 
endif

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv4` -lstdc++
COMMON+= `pkg-config --cflags opencv4` 
endif

after that you'll have this problem: ./src/image_opencv.cpp:12:1: error: ‘IplImage’ does not name a type; did you mean ‘image’?

but you can solve it using the solution #1347 (comment)

in file ./src/image_opencv.cpp

add these two functions

Mat image_to_mat(image im)
{
image copy = copy_image(im);
constrain_image(copy);
if(im.c == 3) rgbgr_image(copy);

Mat m(cv::Size(im.w,im.h), CV_8UC(im.c));
int x,y,c;

int step = m.step;
for(y = 0; y < im.h; ++y){
    for(x = 0; x < im.w; ++x){
        for(c= 0; c < im.c; ++c){
            float val = im.data[c*im.h*im.w + y*im.w + x];
            m.data[y*step + x*im.c + c] = (unsigned char)(val*255);
        }
    }
}

free_image(copy);
return m;

}

image mat_to_image(Mat m)
{

int h = m.rows;
int w = m.cols;
int c = m.channels();
image im = make_image(w, h, c);
unsigned char *data = (unsigned char *)m.data;
int step = m.step;
int i, j, k;

for(i = 0; i < h; ++i){
    for(k= 0; k < c; ++k){
        for(j = 0; j < w; ++j){
            im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
        }
    }
}
rgbgr_image(im);
return im;

}

AFTER THAT REMOVE THESE THREE FUNCTIONS

/*
IplImage *image_to_ipl(image im)
{
    int x,y,c;
    IplImage *disp = cvCreateImage(cvSize(im.w,im.h), IPL_DEPTH_8U, im.c);
    int step = disp->widthStep;
    for(y = 0; y < im.h; ++y){
        for(x = 0; x < im.w; ++x){
            for(c= 0; c < im.c; ++c){
                float val = im.data[c*im.h*im.w + y*im.w + x];
                disp->imageData[y*step + x*im.c + c] = (unsigned char)(val*255);
            }
        }
    }
    return disp;
}

image ipl_to_image(IplImage* src)
{
    int h = src->height;
    int w = src->width;
    int c = src->nChannels;
    image im = make_image(w, h, c);
    unsigned char *data = (unsigned char *)src->imageData;
    int step = src->widthStep;
    int i, j, k;

    for(i = 0; i < h; ++i){
        for(k= 0; k < c; ++k){
            for(j = 0; j < w; ++j){
                im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
            }
        }
    }
    return im;
}

Mat image_to_mat(image im)
{
    image copy = copy_image(im);
    constrain_image(copy);
    if(im.c == 3) rgbgr_image(copy);

    IplImage *ipl = image_to_ipl(copy);
    Mat m = cvarrToMat(ipl, true);
    cvReleaseImage(&ipl);
    free_image(copy);
    return m;
}

image mat_to_image(Mat m)
{
    IplImage ipl = m;
    image im = ipl_to_image(&ipl);
    rgbgr_image(im);
    return im;
}*/

and remove all CV_ from opencv flags, for example:

    if(w) cap->set(CV_CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CV_CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CV_CAP_PROP_FPS, w);

    if(w) cap->set(CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CAP_PROP_FPS, w);

This one solved my problem.
On Ubuntu 20.04, CUDA 10.1

I have changed following things in the Mkefile.

from
LDFLAGS+= `pkg-config --libs opencv` -lstdc++ COMMON+= `pkg-config --cflags opencv`
to
LDFLAGS+= `pkg-config --libs opencv4` -lstdc++ COMMON+= `pkg-config --cflags opencv4`

martianvenusian on 17 Sep 2020

👍3

Just inside of Makefile
change

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv` -lstdc++
COMMON+= `pkg-config --cflags opencv` 
endif

ifeq ($(OPENCV), 1) 
COMMON+= -DOPENCV
CFLAGS+= -DOPENCV
LDFLAGS+= `pkg-config --libs opencv4` -lstdc++
COMMON+= `pkg-config --cflags opencv4` 
endif

after that you'll have this problem: ./src/image_opencv.cpp:12:1: error: ‘IplImage’ does not name a type; did you mean ‘image’?
but you can solve it using the solution #1347 (comment)
in file ./src/image_opencv.cpp
add these two functions

Mat image_to_mat(image im)
{
image copy = copy_image(im);
constrain_image(copy);
if(im.c == 3) rgbgr_image(copy);

Mat m(cv::Size(im.w,im.h), CV_8UC(im.c));
int x,y,c;

int step = m.step;
for(y = 0; y < im.h; ++y){
    for(x = 0; x < im.w; ++x){
        for(c= 0; c < im.c; ++c){
            float val = im.data[c*im.h*im.w + y*im.w + x];
            m.data[y*step + x*im.c + c] = (unsigned char)(val*255);
        }
    }
}

free_image(copy);
return m;

}

image mat_to_image(Mat m)
{

int h = m.rows;
int w = m.cols;
int c = m.channels();
image im = make_image(w, h, c);
unsigned char *data = (unsigned char *)m.data;
int step = m.step;
int i, j, k;

for(i = 0; i < h; ++i){
    for(k= 0; k < c; ++k){
        for(j = 0; j < w; ++j){
            im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
        }
    }
}
rgbgr_image(im);
return im;

}

AFTER THAT REMOVE THESE THREE FUNCTIONS

/*
IplImage *image_to_ipl(image im)
{
    int x,y,c;
    IplImage *disp = cvCreateImage(cvSize(im.w,im.h), IPL_DEPTH_8U, im.c);
    int step = disp->widthStep;
    for(y = 0; y < im.h; ++y){
        for(x = 0; x < im.w; ++x){
            for(c= 0; c < im.c; ++c){
                float val = im.data[c*im.h*im.w + y*im.w + x];
                disp->imageData[y*step + x*im.c + c] = (unsigned char)(val*255);
            }
        }
    }
    return disp;
}

image ipl_to_image(IplImage* src)
{
    int h = src->height;
    int w = src->width;
    int c = src->nChannels;
    image im = make_image(w, h, c);
    unsigned char *data = (unsigned char *)src->imageData;
    int step = src->widthStep;
    int i, j, k;

    for(i = 0; i < h; ++i){
        for(k= 0; k < c; ++k){
            for(j = 0; j < w; ++j){
                im.data[k*w*h + i*w + j] = data[i*step + j*c + k]/255.;
            }
        }
    }
    return im;
}

Mat image_to_mat(image im)
{
    image copy = copy_image(im);
    constrain_image(copy);
    if(im.c == 3) rgbgr_image(copy);

    IplImage *ipl = image_to_ipl(copy);
    Mat m = cvarrToMat(ipl, true);
    cvReleaseImage(&ipl);
    free_image(copy);
    return m;
}

image mat_to_image(Mat m)
{
    IplImage ipl = m;
    image im = ipl_to_image(&ipl);
    rgbgr_image(im);
    return im;
}*/

and remove all CV_ from opencv flags, for example:

    if(w) cap->set(CV_CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CV_CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CV_CAP_PROP_FPS, w);

    if(w) cap->set(CAP_PROP_FRAME_WIDTH, w);
    if(h) cap->set(CAP_PROP_FRAME_HEIGHT, w);
    if(fps) cap->set(CAP_PROP_FPS, w);

This one solved my problem.
On Ubuntu 20.04, CUDA 10.1

I have changed following things in the Mkefile.

from
LDFLAGS+= `pkg-config --libs opencv` -lstdc++ COMMON+= `pkg-config --cflags opencv`
to
LDFLAGS+= `pkg-config --libs opencv4` -lstdc++ COMMON+= `pkg-config --cflags opencv4`

Can I also add

setWindowProperty(name, CV_WND_PROP_FULLSCREEN, CV_WINDOW_FULLSCREEN);

needs changing to

setWindowProperty(name, WND_PROP_FULLSCREEN, WINDOW_FULLSCREEN);

if anyone else finds this is also an error.

George-Ogden on 14 Oct 2020

👍4

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