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measuring height of color using pixel.

hello,

I am very new to opencv, I want to measure the height of the color as in attached figure there is pipette with blood and i want to measure the level of blood in unit like mm. i try with contour but still not get any success to measure the volume. is there any suggestion or code please help me. i tryed also (http://answers.opencv.org/question/15992/measuring-the-dimensionheight-and-width-of-an-object/) but i am getting error. `#include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

include <opencv cxcore.h="">

include <iostream>

include <stdio.h>

include <stdlib.h>

using namespace cv; using namespace std;

int main(int argc, char** argv) { VideoCapture stream1(0); //0 is the id of video device.0 if you have only one camera.

stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640); stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480); int thresh = 100; int max_thresh = 255; RNG rng(12345);

if (!stream1.isOpened()) { //check if video device has been initialised cout << "cannot open camera"; }

//unconditional loop while (true) { Mat cameraFrame; Mat src_gray; Mat threshold_output; vector<vector<point> > contours; vector<vec4i> hierarchy;

cvtColor( cameraFrame,src_gray, CV_BGR2GRAY ); // produces out2, a one-channel image (CV_8UC1) blur( src_gray, src_gray, Size(5,5) );

threshold( src_gray, threshold_output, 150, 200, CV_THRESH_BINARY_INV);

findContours( threshold_output, contours, hierarchy,CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

/// Find the rotated rectangles
vector<RotatedRect> minRect( contours.size() );

for( int i = 0; i < contours.size(); i++ ) { minRect[i] = minAreaRect( Mat(contours[i]) ); }

/// Draw contours + rotated rects + ellipses Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 ); for( int i = 0; i < contours.size(); i++ ) { Scalar color = Scalar( rng.uniform(0,0), rng.uniform(0,0), rng.uniform(250,250) ); // contour drawContours( drawing, contours, i, color, 1, 8, vector<vec4i>(), 0, Point() ); // rotated rectangle
Point2f rect_points[4]; minRect[i].points( rect_points );

for(int j = 0; j < 4; j++ ) line( cameraFrame, rect_points[j], rect_points[(j+1)%4], color, 1, 8 ); }

if (stream1.read(cameraFrame))
{

 namedWindow("cam", 1);
 imshow("cam", cameraFrame);

}

waitKey(33);

} return 0; }

` i want to do measurement using usb camera. Thank you very much in advance for any possible help.

measuring height of color using pixel.

hello,

`#include "opencv2/highgui/highgui.hpp"
 include "opencv2/imgproc/imgproc.hpp"
 include <opencv cxcore.h="">
 include <iostream>
 include <stdio.h>
 include <stdlib.h>
 "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv/cxcore.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace cv;
using namespace std;
 std;


int main(int argc, char** argv) {
VideoCapture stream1(0);   //0 is the id of video device.0 if you have only one camera.
 camera.

stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640);
stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
int thresh = 100; int max_thresh = 255; RNG rng(12345);
 rng(12345);

if (!stream1.isOpened()) { //check if video device has been initialised
cout << "cannot open camera";
}
 }

//unconditional loop
while (true) {
Mat cameraFrame;
Mat src_gray;
Mat threshold_output;
vector<vector<point> vector<vector<Point> > contours;
vector<vec4i> hierarchy;
 vector<Vec4i> hierarchy;

cvtColor( cameraFrame,src_gray, CV_BGR2GRAY ); // produces out2, a one-channel image (CV_8UC1)
    blur( src_gray, src_gray, Size(5,5) );
 );

    threshold( src_gray, threshold_output, 150, 200, CV_THRESH_BINARY_INV);

 findContours( threshold_output, contours, hierarchy,CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

 /// Find the rotated rectangles
 vector<RotatedRect> minRect( contours.size() );
 for( int i = 0; i < contours.size(); i++ )
{ minRect[i] = minAreaRect( Mat(contours[i]) ); }
 }
/// Draw contours + rotated rects + ellipses
Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
for( int i = 0; i < contours.size(); i++ )
{ Scalar color = Scalar( rng.uniform(0,0), rng.uniform(0,0), rng.uniform(250,250) ); // contour drawContours( drawing, contours, i, color, 1, 8, vector<vec4i>(), 0, Point() ); // rotated rectangle 
 
Point2f rect_points[4]; minRect[i].points( rect_points );
 );
for(int j = 0; j < 4; j++ )
line( cameraFrame, rect_points[j], rect_points[(j+1)%4], color, 1, 8 );
}
 }

    if (stream1.read(cameraFrame))
 {

  namedWindow("cam", 1);
  imshow("cam", cameraFrame);

    }
waitKey(33);

}
return 0;
}
 waitKey(33);
 }
return 0;
} ` i want to do measurement using usb camera.
Thank you very much in advance for any possible help.

          3    No.3 Revision 
      updated 
2015-04-04 06:23:35 -0600
 
    wuling  
 424  ●4 ●15 ●25  
 
 
 
  
 
 
 
  measuring height of color using pixel.
 hello,
 I am very new to opencv, I want to measure the height of the color
is there any suggestion or code please help me. i tryed also (http://answers.opencv.org/question/15992/measuring-the-dimensionheight-and-width-of-an-object/) but i am getting error.
 `#include #include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv/cxcore.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace cv;
using namespace std;


int main(int argc, char** argv) {
VideoCapture stream1(0);   //0 is the id of video device.0 if you have only one camera.

stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640);
stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
int thresh = 100; int max_thresh = 255; RNG rng(12345);

if (!stream1.isOpened()) { //check if video device has been initialised
cout << "cannot open camera";
}

//unconditional loop
while (true) {
Mat cameraFrame;
Mat src_gray;
Mat threshold_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;

cvtColor( cameraFrame,src_gray, CV_BGR2GRAY ); // produces out2, a one-channel image (CV_8UC1)
    blur( src_gray, src_gray, Size(5,5) );

    threshold( src_gray, threshold_output, 150, 200, CV_THRESH_BINARY_INV);

    findContours( threshold_output, contours, hierarchy,CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

    /// Find the rotated rectangles
    vector<RotatedRect> minRect( contours.size() );
for( int i = 0; i < contours.size(); i++ ) 
{ minRect[i] = minAreaRect( Mat(contours[i]) ); }

/// Draw contours + rotated rects + ellipses
Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
for( int i = 0; i < contours.size(); i++ )
{ Scalar color = Scalar( rng.uniform(0,0), rng.uniform(0,0), rng.uniform(250,250) ); // contour drawContours( drawing, contours, i, color, 1, 8, vector<vec4i>(), 0, Point() ); // rotated rectangle    
    Point2f rect_points[4]; minRect[i].points( rect_points );

   for(int j = 0; j < 4; j++ ) 
   line( cameraFrame, rect_points[j], rect_points[(j+1)%4], color, 1, 8 );
 }

    if (stream1.read(cameraFrame))
    {

     namedWindow("cam", 1);
     imshow("cam", cameraFrame);

    }
waitKey(33);

}
return 0;
}
 ` i want to do measurement using usb camera.
Thank you very much in advance for any possible help.
 
 
 
          4    No.4 Revision 
      updated 
2015-04-04 06:24:28 -0600
 
    wuling  
 424  ●4 ●15 ●25  
 
 
 
  
 
 
 
  measuring height of color using pixel.
 hello,
 I am very new to opencv, I want to measure the height of the color
is there any suggestion or code please help me. i tryed also (http://answers.opencv.org/question/15992/measuring-the-dimensionheight-and-width-of-an-object/) but i am getting error.
 #include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv/cxcore.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace cv;
using namespace std;


int main(int argc, char** argv) {
VideoCapture stream1(0);   //0 is the id of video device.0 if you have only one camera.

stream1.set(CV_CAP_PROP_FRAME_WIDTH, 640);
stream1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
int thresh = 100; int max_thresh = 255; RNG rng(12345);

if (!stream1.isOpened()) {  //check if video device has been initialised
cout << "cannot open camera";
}

//unconditional loop
while (true) {
Mat cameraFrame;
Mat src_gray;
Mat threshold_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;

cvtColor( cameraFrame,src_gray, CV_BGR2GRAY ); // produces out2, a one-channel image (CV_8UC1)
    blur( src_gray, src_gray, Size(5,5) );

    threshold( src_gray, threshold_output, 150, 200, CV_THRESH_BINARY_INV);

    findContours( threshold_output, contours, hierarchy,CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

    /// Find the rotated rectangles
    vector<RotatedRect> minRect( contours.size() );
for( int i = 0; i < contours.size(); i++ ) 
{ minRect[i] = minAreaRect( Mat(contours[i]) ); }

/// Draw contours + rotated rects + ellipses
Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
for( int i = 0; i < contours.size(); i++ )
{ Scalar color = Scalar( rng.uniform(0,0), rng.uniform(0,0), rng.uniform(250,250) ); // contour drawContours( drawing, contours, i, color, 1, 8, vector<vec4i>(), 0, Point() ); // rotated rectangle    
    Point2f rect_points[4]; minRect[i].points( rect_points );

   for(int j = 0; j < 4; j++ ) 
   line( cameraFrame, rect_points[j], rect_points[(j+1)%4], color, 1, 8 );
 }

    if (stream1.read(cameraFrame))
    {

     namedWindow("cam", 1);
     imshow("cam", cameraFrame);

    }
waitKey(33);

}
return 0;
}
 ` i want to do measurement using usb camera.
Thank you very much in advance for any possible help.