java - Overlapping shapes recognition (OpenCV) -


i have simple image containing shapes: rectangles , ellipses, in total number of 4 or 5. shapes can rotated, scaled , overlapped. there sample input: sample image task detect of these figures , prepare information them: size, position, rotation, etc. in opinion, core problem fact shapes can overlapped each other. tried search information kind of problem , find opencv library can useful.

opencv has ability detect contours , try fit ellipses or rectangles these contours. problem when shapes overllaped, contours mixed up.

i think following algorithm: detect characteristic points: , put white dot @ them. got these every figure divided separate sections: enter image description here can try link these parts using information, example complexity value (i fit curve approxpolydp contour , read how many parts has). starts hard. other idea try of permutations of linking contours , trying fit figures them. best compilation output.

any ideas how create simple elegant solution?

blurring image helps find intersections seen in code

#include "opencv2/imgproc.hpp" #include "opencv2/highgui.hpp"  using namespace cv;  int main( int argc, char** argv ) {     mat src = imread( argv[1] );     mat gray, blurred;     cvtcolor( src, gray, color_bgr2gray );     threshold( gray, gray, 127, 255, thresh_binary );     gaussianblur( gray, blurred, size(), 9 );     threshold( blurred, blurred, 200, 255, thresh_binary_inv );     gray.setto( 255, blurred );     imshow("result",gray);     waitkey();      return 0; }

result image:enter image description here

step 2

simply, borrowed code generalcontours_demo2.cpp

#include "opencv2/imgproc.hpp" #include "opencv2/highgui.hpp"  using namespace cv; using namespace std;  int main( int argc, char** argv ) {     mat src = imread( argv[1] );     mat gray, blurred;     cvtcolor( src, gray, color_bgr2gray );     threshold( gray, gray, 127, 255, thresh_binary );     gaussianblur( gray, blurred, size(), 5 );     threshold( blurred, blurred, 180, 255, thresh_binary_inv );     gray.setto( 255, blurred );     imshow("result of step 1",gray);      vector<vector<point> > contours;      /// find contours     findcontours( gray.clone(), contours, retr_tree, chain_approx_simple );      /// find rotated rectangles , ellipses each contour     vector<rotatedrect> minrect( contours.size() );     vector<rotatedrect> minellipse( contours.size() );      for( size_t = 0; < contours.size(); i++ )     {         minrect[i] = minarearect( mat(contours[i]) );         if( contours[i].size() > 5 )         {             minellipse[i] = fitellipse( mat(contours[i]) );         }     }      /// draw contours + rotated rects + ellipses     for( size_t = 0; i< contours.size(); i++ )     {         mat drawing = src.clone();         // contour         //drawcontours( drawing, contours, (int)i, color, 1, 8, vector<vec4i>(), 0, point() );         // ellipse         ellipse( drawing, minellipse[i], scalar( 0, 0, 255 ), 2 );         // rotated rectangle         point2f rect_points[4];         minrect[i].points( rect_points );         for( int j = 0; j < 4; j++ )             line( drawing, rect_points[j], rect_points[(j+1)%4], scalar( 0, 255, 0 ), 2 );         /// show in window         imshow( "results of step 2", drawing );         waitkey();     }      return 0; }

you can following result images among others. hope solve final step. enter image description here enter image description here enter image description here enter image description here


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more

ruby on rails - Seeing duplicate requests handled with Unicorn -

recently upgraded our ec2 instances c3.large in order boost more unicorn workers handle increased traffic our site. (6xworkers per machine - 2 ec2 instances). when did this, started seeing duplicate records being created! looks somehow, maybe 2 unicorn workers attempting process same request? in nginx logs see 1 [post] request particular rails controller - yet 2 records being created in database. i'm hitting kind of race condition issue - have no idea how debug this. doesn't happen time, when it's frustrating well. noticed 2 database records within 5 seconds of each other. (and yes disable button when user clicks submit button). unicorn 4.8.2 ruby 1.9.3 rails 3.2.14 any great! thanks! although may not fix problem, upgrade ruby 2.0.0. there blog mentioning idea upgrade ruby 2.0.0 if using unicorn. for example: https://www.digitalocean.com/community/articles/how-to-optimize-unicorn-workers-in-a-ruby-on-rails-app specifically: if using ruby 1.9, ...
Read more