@pklab Thanks It worked fine after editing and debugging. I will oblige you if give me some small hint of this code mean Algorithms used in it or something like this.

hello sir, i investigate the code and yeah!! it shows me one error now as drawMarker was not declare in this scope, i added highgui.hpp and imgproc.hpp as weel but it shows the error. When i remove 2.0 from this then i got no error except this drawmarker Point2f pt0 = (rect_points[0] + rect_points[3]) / 2.0; Point2f pt1 = (rect_points[1] + rect_points[2]) / 2.0; Point2f pt2 = (rect_points[0] + rect_points[1]) / 2.0; Point2f pt3 = (rect_points[2] + rect_points[3]) / 2.0;

@pklab i update the opencv but still same things.this time not error but some NOTE like /usr/include/c++/valarray :note template class........something like this . am i compiling it right as g++ -ggbd 'pkg-config' --cflags --libs opencv' <filename> -o object and point2f pt3 =(rect_points[2] +rect_points[3] /2.0); is common in every line

Ok sir thanks for your kind help......i will investigate it if error occurs i will ask you also updating my opencv

@pklab it shows error in Morph. morph was not declared in this scope

@berak dear berak i don't know why my compiler not reading vector<> i have example code of opencv also have vector. i also shows the errors. i have done with it but nothing happens

include<vector>

@pklab Thanks very much i am really oblige you. Ok i will implement it if any problem occurs i will ask you.

@v4ven27 thanks sir But i want to know how to use lines.size() simply. i don't know how to use it because i m new in opencv

@pklab i edit the original image i don't bother about corner crack

@berak line.size().i didn't find any function in opencv and how to use it

SO tell me your email id so i can mail it to you sir. i don't understand what the houghlines() function returns. So if i stores the values and make decision

Hello there i used the thresolding techniques(thresold TOZERO) of my biscuit image and used canny edge detection. After then i used hough transform of it. it detect the biscuit crack. Now i want to make it decision based mean if crack in biscuit is detected it tells Detected in my terminal. So i want to know what is the function returns and how to do this. Please reply. Here is the example image in this image u can see red line which detects the crack. if somehow i adjust to findout not by seeing image that image is crack ..like counting red pixels .if presents mean image is crack.

Hello there i used the thresolding techniques(thresold TOZERO) of my biscuit image and used canny edge detection. After then i used hough transform of it. it detect the biscuit crack. Now i want to make it decision based mean if crack in biscuit is detected it tells Detected in my terminal. So i want to know what is the function returns and how to do this. Please reply.

Yes command run correct but again no change in o/p while compiling the code. In opencv docs there is command but when i run it Here is the error. CMake Error: The source directory "/home/sachin/Desktop/pics" does not appear to contain CMakeLists.txt. Specify --help for usage, or press the help button on the CMake GUI. THIS IS THE COMMAND cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/home/sachin/opencv /home/sachin/opencv is the folder path and /usr/local/include/opencv2 is my library path

cmake -DBUILD_JPEG -DBUILD_TIFF -DBUILD_PNG Parse error in command line argument: -DBUILD_JPEG Should be: VAR:type=value CMake Error: No cmake script provided. CMake Error: Problem processing arguments. Aborting.

Sir how can i do it i see all steps of installation from http://docs.opencv.org/2.4/doc/tutori...

Hello Berak i have one biscuit image captured from camera using opencv now i am detecting lines in the pic so i used haughline transform but line is not detected mean output is coming but the red lines where crack is, not coming.i can send you a pic,,and code is from http://opencvexamples.blogspot.com/20...

sir i actually update my system after that it is not running.

sir this code iis ok with ubuntu but while i run it on raspberry pi it gives error like videoc_dqbuf: no such devices

Hello There i have opencv in my ubuntu platform .Today i started it and comile the programme but it tells many error while compiling it. Here it is

sachin@sachin-desktop:~/Desktop$ g++ `pkg-config --cflags opencv` haugh.cpp -o haugh `pkg-config --libs opencv`

/usr/bin/ld: warning: libjpeg.so.62, needed by /usr/local/lib/libopencv_imgcodecs.so, not found (try using -rpath or -rpath-link)
/usr/lib/libtiff.so.4: undefined reference to `jpeg_read_raw_data'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_resync_to_restart'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_std_error'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_CreateDecompress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_start_compress'
/usr/lib/libjasper.so.1: undefined reference to `jpeg_default_colorspace'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_set_quality'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_read_header'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_alloc_huff_table'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_write_raw_data'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_destroy_decompress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_stdio_dest'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_destroy'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_calc_output_dimensions'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_abort'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_finish_compress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_destroy_compress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_finish_decompress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_set_defaults'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_start_decompress'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_suppress_tables'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_write_scanlines'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_set_colorspace'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_CreateCompress'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_read_scanlines'
/usr/lib/libtiff.so.4: undefined reference to `jpeg_write_tables'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_simple_progression'
/usr/local/lib/libopencv_imgcodecs.so: undefined reference to `jpeg_stdio_src'
collect2: ld returned 1 exit status

Can this do the segment of image like background substraction. Mean i have to fix the Background first and take the picture and apply absdiff(bg,fg);because i want to totally black my background because neglating the effect of light while taking the picture with camera

Sir i have actually cracked round biscuit i want to detect the crack it it. so first do it background substaction of image for segment then thresholding of this image. now use haugh line transform. but i am segment the image here with watershad algo. but results is not coming. Actually i am Newbie in image Processing And i ma from electric engg. this is my Project work. i am learning it.

The question is how can i give input while run code as ./bs_a -img p.jpg it shows error. i only want to background sub. of only 1 image.

i does mean that camera is opening and taking picture and segment it and save segment image but camera is running .My camera light is on.

Hello There i want to segment image which is capture from cam so here is the code i wrote with help of @berak.

#include "opencv2/opencv.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

using namespace cv;
using namespace std;
///////////////////////////////////////////image capture and stop camera//////////////////////////////
int main(int, char**)

{
    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened())  // check if we succeeded
        return -1;

    Mat frame; // keep it out of the loop, so we can save latest img.
    int64 t0 = getTickCount(); // start time
    for(;;)
    {
        cap >> frame; // get a new frame from camera
        int64 t1 = getTickCount(); // time now
        double timeRunning = double(t1-t0)/getTickFrequency();
        if (timeRunning >= 1.0) // 2 seconds
              break;
    }
    // write last frame to  disk:
    imwrite("/home/sachin/Desktop/a.jpg", frame);
    // the camera will be deinitialized automatically in VideoCapture destructor

////////////////////////////////////Adaptive segmentation /////////////////////////////

Mat src,dst,img;
   img = imread("/home/sachin/Desktop/a.jpg"); //read the image data in the file "MyPic.JPG" and store it in 'img'

if (img.empty()) //check whether the image is loaded or not
{
cout << "Error : Image cannot be loaded..!!" << endl;
          //system("pause"); //wait for a key press
return -1;
}
cvtColor(img,src,CV_BGR2GRAY);
//cvtColor( src, src_gray, CV_BGR2GRAY );
adaptiveThreshold(src,dst,230,ADAPTIVE_THRESH_MEAN_C,THRESH_BINARY ,5,2);

namedWindow("Adaptive", CV_WINDOW_NORMAL); //create a window with the name "MyWindow"
imshow("Adaptive", dst); //display the image which is stored in the 'img' in the "MyWindow" window

waitKey(0); //wait infinite time for a keypress

     destroyWindow("MyWindow"); //destroy the window with the name, "MyWindow"
    return 0;
}

here camera capture the image and segment the image but camera can't stop. please help me out.

Hello there i am newbie in opencv. i am doing with camera capturing nd got the code from some google source. i understood the code.

#include "opencv2/opencv.hpp"

using namespace cv;

int main(int, char**)
{
    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened())  // check if we succeeded
        return -1;

    for(;;)
    {
        Mat frame;
        cap >> frame; // get a new frame from camera
        // do any processing
        imwrite("/home/sachin/Desktop/a.jpg", frame);
        if(waitKey(1) >= 0) break;   // you can increase delay to 2 seconds here

cap.release(); } // the camera will be deinitialized automatically in VideoCapture destructor return 0; }

here camera capture the image while I press ctrl+c. but i want to do it as automatically close the camera in 2 second. i don't how to close camera . please help me anticipation of your help.