111

src/main/java/Test.java

@@ -1,22 +1,23 @@
-import org.opencv.core.*;
+import base.DllLoad;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfPoint;
+import org.opencv.core.MatOfPoint2f;
+import org.opencv.core.Point;
+import org.opencv.core.Rect;
+import org.opencv.core.RotatedRect;
+import org.opencv.core.Scalar;
+import org.opencv.core.Size;
 import org.opencv.highgui.HighGui;
 import org.opencv.imgcodecs.Imgcodecs;
 import org.opencv.imgproc.Imgproc;
 
 import java.io.File;
-import java.net.URL;
 import java.util.ArrayList;
 import java.util.List;
 
 
-public class Test {
-    static {
-        URL systemResource = ClassLoader.getSystemResource("lib/x64/opencv_java460.dll");
-        System.load(systemResource.getPath());
-//        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
-        //注意程序运行的时候需要在VM option添加该行 指明opencv的dll文件所在路径
-        //-Djava.library.path=$PROJECT_DIR$\opencv\x64
-    }
+public class Test extends DllLoad {
 
     public static void main(String[] args) {
 
@@ -32,10 +33,10 @@ public class Test {
          */
 
 
-        File file = new File("D://1.png");
+        File file = new File("imgs/3.png");
         Mat src = Imgcodecs.imread(file.getAbsolutePath());
-        HighGui.imshow("源图片", src);
-        HighGui.waitKey();
+//        HighGui.imshow("源图片", src);
+//        HighGui.waitKey();
         // 放大图像
 //        Mat resize = new Mat();
 //        Imgproc.resize(src, resize, new Size(src.cols()*1.5,src.rows()*1.5));
@@ -45,14 +46,14 @@ public class Test {
         //图片灰度化 https://blog.csdn.net/ren365880/article/details/103869207
         Mat gary = new Mat();
         Imgproc.cvtColor(src, gary, Imgproc.COLOR_BGR2GRAY);
-        HighGui.imshow("灰度化图片", gary);
-        HighGui.waitKey();
+//        HighGui.imshow("灰度化图片", gary);
+//        HighGui.waitKey();
 
         //图像边缘处理 https://blog.csdn.net/ren365880/article/details/103938232
         Mat edges = new Mat();
         Imgproc.Canny(gary, edges, 200, 200, 3, false);
-        HighGui.imshow("边缘处理", edges);
-        HighGui.waitKey();
+//        HighGui.imshow("边缘处理", edges);
+//        HighGui.waitKey();
 
         //发现轮廓
         List<MatOfPoint> list = new ArrayList<MatOfPoint>();
@@ -83,8 +84,7 @@ public class Test {
          * CHAIN_APPROX_TC89_KCOS = 4; 使用teh-Chinl chain 近似算法。
          */
 
-        Imgproc.findContours(edges, list, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_NONE);
-
+        Imgproc.findContours(edges, list, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);
 
         /*
          * 绘制轮廓轮廓或填充轮廓。
@@ -96,7 +96,79 @@ public class Test {
          * @param thickness绘制轮廓的线的粗细。如果为负（例如，thickness =＃FILLED），则绘制轮廓内部。
          * @param lineType线路连接。请参阅https://blog.csdn.net/ren365880/article/details/103952856
          */
-        Imgproc.drawContours(src, list, -1, new Scalar(0, 255, 0), 1, Imgproc.LINE_AA);
+//        Imgproc.drawContours(src, list, -1, new Scalar(0, 255, 0), 1, Imgproc.LINE_AA);
+
+//        Mat mat = new Mat();
+//        Imgproc.Sobel(gary,mat,1,1,0);
+//        HighGui.imshow("轮廓", mat);
+//        HighGui.waitKey();
+//        Imgproc.Sobel(gary,mat,1,0,1);
+//        HighGui.imshow("轮廓", mat);
+//        HighGui.waitKey();
+
+        for (MatOfPoint matOfPoint : list) {
+            MatOfPoint2f c = new MatOfPoint2f();
+            matOfPoint.convertTo(c, CvType.CV_32F);
+//            double peri = Imgproc.arcLength(c, false);
+//            MatOfPoint2f c2 = new MatOfPoint2f();
+//            Imgproc.approxPolyDP(c,c2,0.015*peri,true);
+
+            // 查找矩形
+            Rect rect = Imgproc.boundingRect(c);
+
+            if (rect.height < 20) {
+                continue;
+            }
+            if (rect.width < rect.height) {
+                continue;
+            }
+            if (rect.width / rect.height < 2 || rect.width / rect.height > 3) {
+                continue;
+            }
+            System.out.println(rect.width + "," + rect.height);
+            Imgproc.rectangle(src, rect, new Scalar(0, 255, 0));
+
+            // 获取最小面积矩形，可能为旋转状态
+            RotatedRect rotatedRect = Imgproc.minAreaRect(c);
+            // 获取四个点
+            Point[] point = new Point[4];
+            rotatedRect.points(point);
+            // 绘制四条边
+            Imgproc.line(src, point[0], point[1], new Scalar(0, 0, 255));
+            Imgproc.line(src, point[1], point[2], new Scalar(0, 0, 255));
+            Imgproc.line(src, point[2], point[3], new Scalar(0, 0, 255));
+            Imgproc.line(src, point[3], point[0], new Scalar(0, 0, 255));
+
+            Mat dst = new Mat(src,rotatedRect.boundingRect());
+
+            Mat dst2 = new Mat(dst.size(), dst.type());
+            //旋转中心点
+            Point cp = new Point(src.width() / 2, src.height() / 2);
+            //旋转角度
+            int angle = 45;
+            //缩放系数
+            int scale = 1;
+            //获取变换矩阵
+            Mat matrix2D = Imgproc.getRotationMatrix2D(cp, angle, scale);
+            Imgproc.warpAffine(dst,dst2,matrix2D,dst2.size(),Imgproc.INTER_NEAREST);
+
+            show(dst2);
+            HighGui.waitKey();
+
+//            Mat mat = new Mat();
+//            Imgproc.Sobel(src, mat, -1, 0, 1);
+//            System.out.println();
+//            HighGui.imshow("轮廓", mat);
+//            HighGui.waitKey();
+
+//
+//            Imgproc.boundingRect()
+//
+//            ArrayList<MatOfPoint> matOfPoints = new ArrayList<>();
+//            rotatedRect.boundingRect()
+//            matOfPoints.add()
+//            Imgproc.drawContours(src, matOfPoints, -1, new Scalar(0, 255, 0), 1, Imgproc.LINE_AA);
+        }
 
         HighGui.imshow("轮廓", src);
         HighGui.waitKey();

src/main/java/base/DllLoad.java

@@ -0,0 +1,21 @@
+package base;
+
+import org.opencv.core.Mat;
+import org.opencv.highgui.HighGui;
+
+import java.net.URL;
+
+public class DllLoad {
+    static {
+        URL systemResource = ClassLoader.getSystemResource("lib/x64/opencv_java460.dll");
+        System.load(systemResource.getPath());
+        //System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
+        //注意程序运行的时候需要在VM option添加该行 指明opencv的dll文件所在路径
+        //-Djava.library.path=$PROJECT_DIR$\opencv\x64
+    }
+
+    public static void show(Mat mat) {
+        HighGui.imshow("展示", mat);
+        HighGui.waitKey();
+    }
+}

src/main/java/base/ImageCut.java

@@ -0,0 +1,26 @@
+package base;
+
+import org.opencv.core.Mat;
+import org.opencv.core.Rect;
+import org.opencv.highgui.HighGui;
+import org.opencv.imgcodecs.Imgcodecs;
+
+import java.io.File;
+
+/**
+ * 图片剪切
+ */
+public class ImageCut extends DllLoad {
+
+    public static void main(String[] args) {
+        File file = new File("imgs/3.png");
+        Mat src = Imgcodecs.imread(file.getAbsolutePath());
+
+        // 剪切为原图像的1/4
+        Rect rect = new Rect(0, 0, src.width() / 2, src.height() / 2);
+        Mat dst = new Mat(src, rect);
+
+        show(dst);
+        System.exit(0);
+    }
+}

src/main/java/base/ImageResize.java

@@ -0,0 +1,26 @@
+package base;
+
+import org.opencv.core.Mat;
+import org.opencv.core.Size;
+import org.opencv.imgcodecs.Imgcodecs;
+import org.opencv.imgproc.Imgproc;
+
+import java.io.File;
+
+/**
+ * 图片缩放操作
+ */
+public class ImageResize extends DllLoad {
+
+    public static void main(String[] args) {
+        File file = new File("imgs/3.png");
+        Mat src = Imgcodecs.imread(file.getAbsolutePath());
+
+        // 放大两倍
+        Mat dst = new Mat();
+        Imgproc.resize(src, dst, new Size(src.width() * 2, src.height() * 2));
+
+        show(dst);
+        System.exit(0);
+    }
+}

src/main/java/base/ImageRotate.java

@@ -0,0 +1,33 @@
+package base;
+
+import org.opencv.core.Mat;
+import org.opencv.core.Point;
+import org.opencv.imgcodecs.Imgcodecs;
+import org.opencv.imgproc.Imgproc;
+
+import java.io.File;
+
+/**
+ * 图片旋转
+ */
+public class ImageRotate extends DllLoad {
+
+    public static void main(String[] args) {
+        File file = new File("imgs/3.png");
+        Mat src = Imgcodecs.imread(file.getAbsolutePath());
+
+        Mat dst = new Mat(src.size(), src.type());
+        //旋转中心点
+        Point c = new Point(src.width() / 2, src.height() / 2);
+        //旋转角度
+        int angle = 45;
+        //缩放系数
+        int scale = 1;
+        //获取变换矩阵
+        Mat matrix2D = Imgproc.getRotationMatrix2D(c, angle, scale);
+        Imgproc.warpAffine(src,dst,matrix2D,dst.size(),Imgproc.INTER_NEAREST);
+
+        show(dst);
+        System.exit(0);
+    }
+}

src/main/java/base/ImageSave.java

@@ -0,0 +1,21 @@
+package base;
+
+import org.opencv.core.Mat;
+import org.opencv.imgcodecs.Imgcodecs;
+
+import java.io.File;
+
+/**
+ * 图片保存
+ */
+public class ImageSave extends DllLoad {
+
+    public static void main(String[] args) {
+        File file = new File("imgs/3.png");
+        Mat src = Imgcodecs.imread(file.getAbsolutePath());
+
+        // 保存为其他文件
+        Imgcodecs.imwrite("imgs/4.png", src);
+        System.exit(0);
+    }
+}

src/main/java/base/README.md

@@ -0,0 +1 @@
+Java OpenCV 基本操作学习