May i know what you mean by CMakeList.txt in your package?

where can i find a webpage that guides me step by step of the installation of opencv with all the required libraries that can do SIFT algorithms?

do you know how i would be able to do this on ubuntu operating system?

i am trying to install opencv 2.4.12 to see if i can obtain the sift libraries that i think are not present in opencv 3.1.0

i do not understand from this webpage http://docs.opencv.org/3.1.0/d7/d9f/t...

how do i build the other modules from opencv_contrib

i wonder if there is a problem with the installation i followed this website to install opencv https://help.ubuntu.com/community/OpenCV

should i install these opencv_contribrepo repositories?

yes i am using opencv3.1

in this code are the images detected and loaded automatically because in python it use imread to read the image. but in this code instead of imread('image.jpeg') it uses char variables argv[1] ?

i copied the code from this webpage to do feature detection http://docs.opencv.org/ref/master/d7/...

i have encountered this error

maurice@maurice-GS70:~$ g++ -ggdb pkg-config --cflags opencv -o basename featuredetector.cpp .cpp featuredetector.cpp pkg-config --libs opencv

featuredetector.cpp:3:28: fatal error: opencv2/core.hpp: No such file or directory #include "opencv2/core.hpp"

                        ^

compilation terminated.

opencv 3.1.0

is there a way to implement it in C++?

Please ignore the first question that i have posted

Again the problem i encountered is about SIFT

Here is my actual code and error

   #include "opencv2/core/core_c.h"
   #include "opencv2/core/core.hpp"
   #include "opencv2/flann/miniflann.hpp"
   #include "opencv2/imgproc/imgproc_c.h"
   #include "opencv2/imgproc/imgproc.hpp"
   #include "opencv2/video/video.hpp"
   #include "opencv2/features2d/features2d.hpp"
   #include "opencv2/objdetect/objdetect.hpp"
   #include "opencv2/calib3d/calib3d.hpp"
   #include "opencv2/ml/ml.hpp"
   #include "opencv2/highgui/highgui_c.h"
   #include "opencv2/highgui/highgui.hpp"
   #include "opencv2/contrib/contrib.hpp"


int main()
{    
 import cv2
  import numpy as np

     img = cv2.imread('python.jpeg')
     gray= cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

     sift = cv2.xfeatures2d.SIFT_create()
     kp = sift.detect(gray,None)

    img=cv2.drawKeypoints(gray,kp)

    cv2.imwrite('sift_keypoints.jpg',img)

   img=cv2.drawKeypoints(gray,kp,flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)
    cv2.imwrite('sift_keypoints.jpg',img)

}

the error i have encountered

sift.cpp:21:23: warning: character constant too long for its type [enabled by default]

      img = cv2.imread('python.jpeg')
                       ^
sift.cpp:29:17: warning: character constant too long for its type [enabled by default]

     cv2.imwrite('sift_keypoints.jpg',img)
                 ^
sift.cpp:31:17: warning: character constant too long for its type [enabled by default]

     cv2.imwrite('sift_keypoints.jpg',img)
                 ^
sift.cpp: In function ‘int main()’:

sift.cpp:18:2: error: ‘import’ was not declared in this scope

  import cv2
  ^
sift.cpp:18:9: error: expected ‘;’ before ‘cv2’

  import cv2
         ^

please ignore this question i accidentally used the wrong code i will post up another question with the error i really encountered

http://docs.opencv.org/3.1.0/da/df5/t... i copied this code into my c++ code and i am not sure if it is correct. Here is my code

#include "opencv2/core/core_c.h"

#include "opencv2/core/core.hpp"

#include "opencv2/flann/miniflann.hpp"

#include "opencv2/imgproc/imgproc_c.h"

#include "opencv2/imgproc/imgproc.hpp"

#include "opencv2/video/video.hpp"

#include "opencv2/features2d/features2d.hpp"

#include "opencv2/objdetect/objdetect.hpp"

#include "opencv2/calib3d/calib3d.hpp"

#include "opencv2/ml/ml.hpp"

#include "opencv2/highgui/highgui_c.h"

#include "opencv2/highgui/highgui.hpp"

#include "opencv2/contrib/contrib.hpp"

int main()

{

import cv2

import numpy as np

img = cv2.imread('python.jpeg') gray= cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

sift = cv2.xfeatures2d.SIFT_create() kp = sift.detect(gray,None) img=cv2.drawKeypoints(gray,kp)

cv2.imwrite('sift_keypoints.jpg',img)

img=cv2.drawKeypoints(gray,kp,flags=cv2.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)

 cv2.imwrite('sift_keypoints.jpg',img)

}

this is the error that occured when the gode is executed

maurice@maurice-OptiPlex-9020:~$ g++ -ggdb pkg-config --cflags opencv -o basename sift.cpp .cpp sift.cpp pkg-config --libs opencv

sift.cpp:2:43: fatal error: opencv2/xfeatures2d/nonfree.hpp:

No such file or directory

include <opencv2 xfeatures2d="" nonfree.hpp="">