detect fiducial of dots

edit

added image above, thanks for your reply!

I can find each dot individually, but what is the best way to search for the whole pattern at once? if that makes sense...

I think the best way is to search the individual points and then merge the detections. Do you have real world images of your marker?

I am yet to make them, but they will be ir-leds, viewed with an infrared camera. So pretty much just white dots on a black background, as above.

like this:

http://tinypic.com/r/2qjf9le/8

only brighter...

thanks! will port your code to c++ and try it out.

ok so i have this:

std::vector< int > cleaned;
double sum = 0;

for (int i = 0; i < contours.size(); i++)
{
    double a = contourArea(contours[i]);

    if (a < 50 && a > 5)
    {
        cleaned.push_back(a);
    }

     sum =(sum + cleaned[i]);   

}

which gives the sum of the contours, as your code does. But i can't get it to draw the rectangle. I ideally need a bounding box that rotates based on the angle of the marker, eg, constrained by the corner points of the square.

apologies for idiocy...

you should have again a look at the code. The area is nowhere summed. I just select some of contours. (and please don't forget to upvote/accept)

ah right. sorry! Still, I can't draw the contour... Any time i use 'cleaned', it crashes..

drawContours(drawing, cleaned, -1, color, CV_FILLED, 8, hierarchy);

Possibly i need to go read some opencv docs. gaargh.

thanks.

std::vector< int > cleaned;

    for (int i = 0; i < contours.size(); i++){
        double a = contourArea(contours[i]);
        if (a < 50 && a > 5)
            cleaned.push_back(i);
    }


    for (int i = 0; i < cleaned.size(); i++){
      drawContours(drawing, contours, cleaned[i], color, CV_FILLED, 8); 
    }