.. _hull:

璁＄畻鐗╀綋鐨勫嚫鍖�
***************

鐩爣
=====

鍦ㄨ繖涓暀绋嬩腑浣犲皢瀛︿範鍒板浣�:

.. container:: enumeratevisibleitemswithsquare

   * 浣跨敤OpenCV鍑芥暟 :convex_hull:`convexHull <>` 


鍘熺悊
======

渚嬬▼
====

鏁欑▼鐨勪唬鐮佸湪涓嬮潰缁欏嚭. 浣犱篃鍙互浠� `杩欓噷 <https://code.ros.org/svn/opencv/trunk/opencv/samples/cpp/tutorial_code/ShapeDescriptors/hull_demo.cpp>`_ 涓嬭浇

.. code-block:: cpp 

   #include "opencv2/highgui/highgui.hpp" 
   #include "opencv2/imgproc/imgproc.hpp"
   #include <iostream>
   #include <stdio.h>
   #include <stdlib.h>

   using namespace cv;
   using namespace std;

   Mat src; Mat src_gray;
   int thresh = 100; 
   int max_thresh = 255;
   RNG rng(12345);

   /// Function header
   void thresh_callback(int, void* );

  /** @function main */
  int main( int argc, char** argv )
   {
     /// 鍔犺浇婧愬浘鍍�
     src = imread( argv[1], 1 );

     /// 杞垚鐏板害鍥惧苟杩涜妯＄硦闄嶅櫔
     cvtColor( src, src_gray, CV_BGR2GRAY );
     blur( src_gray, src_gray, Size(3,3) );

     /// 鍒涘缓绐椾綋
     char* source_window = "Source";
     namedWindow( source_window, CV_WINDOW_AUTOSIZE );
     imshow( source_window, src );

     createTrackbar( " Threshold:", "Source", &thresh, max_thresh, thresh_callback );
     thresh_callback( 0, 0 );

     waitKey(0);
     return(0);
   }

   /** @function thresh_callback */
   void thresh_callback(int, void* )
   {
     Mat src_copy = src.clone();
     Mat threshold_output;
     vector<vector<Point> > contours;
     vector<Vec4i> hierarchy;

     /// 瀵瑰浘鍍忚繘琛屼簩鍊煎寲
     threshold( src_gray, threshold_output, thresh, 255, THRESH_BINARY );

     /// 瀵绘壘杞粨 
     findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

     /// 瀵规瘡涓疆寤撹绠楀叾鍑稿寘
     vector<vector<Point> >hull( contours.size() );
     for( int i = 0; i < contours.size(); i++ )
        {  convexHull( Mat(contours[i]), hull[i], false ); } 

     /// 缁樺嚭杞粨鍙婂叾鍑稿寘
     Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
     for( int i = 0; i< contours.size(); i++ )
        { 
          Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
          drawContours( drawing, contours, i, color, 1, 8, vector<Vec4i>(), 0, Point() ); 
          drawContours( drawing, hull, i, color, 1, 8, vector<Vec4i>(), 0, Point() );       
        }

     /// 鎶婄粨鏋滄樉绀哄湪绐椾綋
     namedWindow( "Hull demo", CV_WINDOW_AUTOSIZE );
     imshow( "Hull demo", drawing );
   }


渚嬬▼璇存槑
============

缁撴灉
======

#. 鍘熷浘鍜岀粨鏋滃浘濡備笅:

   ========== ==========  
    |Hull_0|   |Hull_1|   
   ========== ==========   

   .. |Hull_0|  image:: images/Hull_Original_Image.jpg
                     :align: middle

   .. |Hull_1|  image:: images/Hull_Result.jpg
                     :align: middle

缈昏瘧鑰�
=================
zhlifly@ `OpenCV涓枃缃戠珯 <http://www.opencv.org.cn>`_  <zhlifly@gmail.com>