init - 初始化项目

samples/cpp/tutorial_code/ShapeDescriptors/pointPolygonTest_demo.cpp

@@ -0,0 +1,88 @@
+/**
+ * @function pointPolygonTest_demo.cpp
+ * @brief Demo code to use the pointPolygonTest function...fairly easy
+ * @author OpenCV team
+ */
+
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+/**
+ * @function main
+ */
+int main( void )
+{
+    /// Create an image
+    const int r = 100;
+    Mat src = Mat::zeros( Size( 4*r, 4*r ), CV_8U );
+
+    /// Create a sequence of points to make a contour
+    vector<Point2f> vert(6);
+    vert[0] = Point( 3*r/2, static_cast<int>(1.34*r) );
+    vert[1] = Point( 1*r, 2*r );
+    vert[2] = Point( 3*r/2, static_cast<int>(2.866*r) );
+    vert[3] = Point( 5*r/2, static_cast<int>(2.866*r) );
+    vert[4] = Point( 3*r, 2*r );
+    vert[5] = Point( 5*r/2, static_cast<int>(1.34*r) );
+
+    /// Draw it in src
+    for( int i = 0; i < 6; i++ )
+    {
+        line( src, vert[i],  vert[(i+1)%6], Scalar( 255 ), 3 );
+    }
+
+    /// Get the contours
+    vector<vector<Point> > contours;
+    findContours( src, contours, RETR_TREE, CHAIN_APPROX_SIMPLE);
+
+    /// Calculate the distances to the contour
+    Mat raw_dist( src.size(), CV_32F );
+    for( int i = 0; i < src.rows; i++ )
+    {
+        for( int j = 0; j < src.cols; j++ )
+        {
+            raw_dist.at<float>(i,j) = (float)pointPolygonTest( contours[0], Point2f((float)j, (float)i), true );
+        }
+    }
+
+    double minVal, maxVal;
+    Point maxDistPt; // inscribed circle center
+    minMaxLoc(raw_dist, &minVal, &maxVal, NULL, &maxDistPt);
+    minVal = abs(minVal);
+    maxVal = abs(maxVal);
+
+    /// Depicting the  distances graphically
+    Mat drawing = Mat::zeros( src.size(), CV_8UC3 );
+    for( int i = 0; i < src.rows; i++ )
+    {
+        for( int j = 0; j < src.cols; j++ )
+        {
+            if( raw_dist.at<float>(i,j) < 0 )
+            {
+                drawing.at<Vec3b>(i,j)[0] = (uchar)(255 - abs(raw_dist.at<float>(i,j)) * 255 / minVal);
+            }
+            else if( raw_dist.at<float>(i,j) > 0 )
+            {
+                drawing.at<Vec3b>(i,j)[2] = (uchar)(255 - raw_dist.at<float>(i,j) * 255 / maxVal);
+            }
+            else
+            {
+                drawing.at<Vec3b>(i,j)[0] = 255;
+                drawing.at<Vec3b>(i,j)[1] = 255;
+                drawing.at<Vec3b>(i,j)[2] = 255;
+            }
+        }
+    }
+    circle(drawing, maxDistPt, (int)maxVal, Scalar(255,255,255));
+
+    /// Show your results
+    imshow( "Source", src );
+    imshow( "Distance and inscribed circle", drawing );
+
+    waitKey();
+    return 0;
+}