Merge branch 'master' of https://github.com/fordreaming/qt_opencv3_le…

…arning

FindContour/FindContour.pro

@@ -15,3 +15,14 @@ DEFINES += QT_DEPRECATED_WARNINGS
 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
 
 SOURCES += main.cpp
+
+INCLUDEPATH += D:/ProgramFiles/opencv/opencv2.4.9/opencv/build/include\
+               D:/ProgramFiles/opencv/opencv2.4.9/opencv/build/include/opencv\
+               D:/ProgramFiles/opencv/opencv2.4.9/opencv/build/include/opencv2\
+
+
+
+LIBS += -LD:/ProgramFiles/opencv/opencv2.4.9/opencv/build/x64/vc12/lib\
+        -lopencv_core249d                           \
+        -lopencv_highgui249d                        \
+        -lopencv_imgproc249d

FindContour/main.cpp

@@ -1,8 +1,66 @@
-#include <QCoreApplication>
+#include<opencv2/core/core.hpp>
+#include<opencv2/opencv.hpp>
+#include <iostream>
+#include <math.h>
 
-int main(int argc, char *argv[])
-{
-    QCoreApplication a(argc, argv);
+using namespace cv;
+using namespace std;
 
-    return a.exec();
+Mat src, dst, gray_src;
+char input_image[] = "input image";
+char output_image[] = "output image";
+
+int main(int argc, char ** argv){
+
+    src = imread("case6.jpg");
+    if (src.empty()){
+        printf("colud not load image ..\n");
+        return -1;
+    }
+
+    namedWindow(input_image, CV_WINDOW_AUTOSIZE);
+    namedWindow(output_image, CV_WINDOW_AUTOSIZE);
+    imshow(input_image, src);
+
+    // 均值降噪
+    Mat blurImg;
+    GaussianBlur(src, blurImg, Size(15, 15), 0, 0);
+    imshow("input image", src);
+
+    // 二值化
+    Mat binary;
+    cvtColor(blurImg, gray_src, COLOR_BGR2GRAY);
+    Threshold(gray_src, binary, 0, 255, THRESH_BINARY | THRESH_TRIANGLE);
+    imshow("binary", binary);
+
+    // 闭操作进行联通物体内部
+    Mat morphImage;
+    Mat kernel = getStructuringElement(MORPH_RECT, Size(3, 3), Point(-1, -1));
+    morphologyEx(binary, morphImage, MORPH_CLOSE, kernel, Point(-1, -1), 2);
+    imshow("morphology", morphImage);
+
+    // 获取最大轮廓
+    vector<vector<Point>> contours;
+    vector<Vec4i> hireachy;
+    findContours(morphImage, contours, hireachy, CV_RETR_EXTERNAL, CHAIN_APPROX_SIMPLE, Point());
+    Mat connImage = Mat::zeros(src.size(), CV_8UC3);
+    for (size_t t = 0; t < contours.size(); t++){
+        Rect rect = boundingRect(contours[t]);
+        if (rect.width < src.cols / 2) continue;
+        if (rect.width > src.cols - 20) continue;
+
+        double area = contourArea(contours[t]);
+        double len = arcLength(contours[t], true);
+
+
+        drawContours(connImage, contours, t, Scalar(0, 0, 255), 1, 8, hireachy);
+        printf("area of star could : %f \n", area);
+        printf("lenght of star could : %f \n", len);
+    }
+    imshow(output_image, connImage);
+
+
+
+    waitKey(0);
+    return 0;
 }