how sent data as serial data opencv c++

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um make template matching program using opencv and c++. this is my code

C++

void track()
{
    if (select_flag)
    {
        //roiImg.copyTo(mytemplate);
//         select_flag = false;
        go_fast = true;
    }

//     imshow( "mytemplate", mytemplate ); waitKey(0);

    Mat result  =  TplMatch( img, mytemplate );
    Point match =  minmax( result ); 

    rectangle( img, match, Point( match.x + mytemplate.cols , match.y + mytemplate.rows ), CV_RGB(255, 0, 255), 1 );

	 char test[] =match;
	 WriteFile(hSerial,test,strlen(test),&btsIO,NULL);

     



    std::cout << "match: " << match << endl;

    /// latest match is the new template
  /*  Rect ROI = cv::Rect( match.x, match.y, mytemplate.cols, mytemplate.rows );
    roiImg = img( ROI );
    roiImg.copyTo(mytemplate);
    imshow( "roiImg", roiImg ); //waitKey(0);*/
}

how i send image cordinate into arduino as serial communication. " char test[] =match;" this line not work. pls help me

Posted 3-Jun-15 22:25pm

Amal anjula

Updated 3-Jun-15 22:32pm

CPallini

v2

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2 solutions

Solution 2

Admittedly you have a mismatch on match.
Even the technical workaround

char * p = (char * ) match;

would be a mistake, because, on the Arduino side, there is no notion about the Point struct).
Probably you have to send the value of the point coordinates (namely match.x, match.y) to the Arduino device. However the format you should use (e.g. binary or textual representation) depends on what is expected by the other side.

Posted 3-Jun-15 22:51pm

CPallini

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Jochen Arndt · Accepted Answer · 2015-06-03T22:42:00

Solution 1

You must create a string containing the point members x and y. How to create (format) the string depends on how the data are interpreted by the receiving program on your Arduino. Example:

C++

// Buffer must be large enough for all possible values to be send
char test[32];
// If Arduino expects data as 'x y' integers followed by line feed.
sprintf(test, "%d %d\n", (int)match.x, (int)match.y);

Posted 3-Jun-15 22:42pm

Jochen Arndt

Comments

Jochen Arndt 4-Jun-15 5:12am

Just change the format string to "x%d y%d\n".

Amal anjula 5-Jun-15 2:27am

its ok sir. but i need another thing. when x=15 serial data is 15. i need it as "050". and when x=204 i need it as "204"is this possible?

Jochen Arndt 5-Jun-15 2:42am

What do you mean by that (x=15 should be printed as '050').

If that is a typo and you need leading zeroes use "x%03d y%03d" where the '0' defines that numbers should be left padded with zeroes and the '3' defines the minimum number of characters to be printed. If the coordinates may be also negative you might use "x%+04d y%+04d". Then all numbers will have a sign.

Have a look at the printf format specifications. You should know them because you will need them as C/C++ programmer.

Amal anjula 11-Jun-15 6:06am

sir , another problem. my code is change to like this below. but now serial data not work properly. have any idea?

cv::RotatedRect boundingBox = cv::minAreaRect(contours[biggestContourIdx]);
cv::Point2f corners[4];
boundingBox.points(corners);
cv::line(drawing, corners[0], corners[1], cv::Scalar(255,255,255));

cv::line(drawing, corners[1], corners[2], cv::Scalar(255,255,255));
cv::line(drawing, corners[2], corners[3], cv::Scalar(255,255,255));
cv::line(drawing, corners[3], corners[0], cv::Scalar(255,255,255));

int w=0;
int h=0;
int area;

//area=abs(corners[0].x-corners[1].x);
w=(corners[0].x-corners[1].x);
h=(corners[0].y-corners[1].y);
area=h*w;

cout<<w;
cout<<"\t";
cout<<h;
cout<<"\t";
cout<<area;
cout<<"\t";

cout<<boundingBox.size;
cout<<"\n";

char test[32];
sprintf(test,"%dx\n%dy\n", (int)w, (int)h);

imshow("MyVideo1", drawing);

cv::namedWindow("Canny");
cv::imshow("Canny",canny_output);

cv::namedWindow("Fill");
cv::imshow("Fill",drawing);

Jochen Arndt 11-Jun-15 6:11am

This

sprintf(test,"%dx\n%dy\n", (int)w, (int)h);

does not look like the previously used format where the x and y characters has been printed in front of the corresponding values.

Amal anjula 11-Jun-15 7:52am

port open, but serial data not going to arduino. arduino Rx and Tx led also not blink every time

Jochen Arndt 11-Jun-15 7:56am

According to your posted code: You forgot to call WriteFile.

Amal anjula 25-Dec-16 7:47am

Above code work nicely.now i want read serial data from the arduino. Im used readfile method. On this way programe wait untill serial data come.how do that.
Thank you.

Jochen Arndt 26-Dec-16 6:22am

How about raising a new question so that everybody here sees it and might answer?

The usual method to do that is using a thread that handles the receiving and sends a message to the GUI (main) thread when new data are available.