java识别图片中的图形形状_如何使用java绘制几何形状到图片？

在Java语言编程中&＃xff0c;如何使用Java绘制几何形状到图片&＃xff1f;

注意&＃xff1a;需要访问网址&＃xff1a;http://book2s.com/java/jar/o/opencv/download-opencv-3.2.0-0.html &＃xff0c; 下载一个OpenCV软件包。这里下载最新版本&＃xff1a;opencv-3.2.0-vc14.exe并解压此文件到D:\software\opencv目录中。

项目结构如下图所示 -

添加一个用户自定义库&＃xff1a;OpenCV3.2&＃xff0c;并指配置构建路径为&＃xff1a;D:\software\opencv\opencv\build\java\x64&＃xff0c;如下图所示 -

以下是使用Java绘制几何形状到图片的程序 -

package com.yiibai;

import org.opencv.core.Core;

import org.opencv.core.Mat;

import org.opencv.core.Point;

import org.opencv.core.Scalar;

import org.opencv.imgcodecs.Imgcodecs;

import org.opencv.imgproc.Imgproc;

public class DrawingshapesOnImage {

public static void main(String args[]) {

// Loading the OpenCV core library

System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

// Reading the Image from the file and storing it in to a Matrix object

String file &＃61; "images/zhonglou.jpg";

Mat matrix &＃61; Imgcodecs.imread(file);

/*

* //Drawing an Ellipse Imgproc.ellipse(matrix, //Matrix obj of the

* image new RotatedRect( new Point(20, 150),new Size(260, 180), 180 ),

* //RotatedRect(Point c, Size s, double a) new Scalar(0, 0, 255),

* //Scalar object for color 10); //Thickness of the line

*/

// Drawing a Rectangle

Imgproc.rectangle(matrix, // Matrix obj of the image

new Point(10, 10), // p1

new Point(390, 390), // p2

new Scalar(0, 100, 255), // Scalar object for color

5); // Thickness of the line

// Writing image

Imgcodecs.imwrite("images/drawingShapesOnImage.jpg", matrix);

System.out.println("Image processed");

}

}

执行上面示例代码&＃xff0c;得到以下结果 -

Image processed

原图 -

在执行上面示例代码成功后&＃xff0c;应该会在 F:\worksp\javaexamples\java_opencv\images 目录中有看到生成一个文件&＃xff1a;drawingShapesOnImage.jpg 。

问题

F:\worksp\javaexamples\java_opencv

Exception in thread "main" java.lang.UnsatisfiedLinkError: no opencv_java320 in java.library.path

at java.lang.ClassLoader.loadLibrary(Unknown Source)

at java.lang.Runtime.loadLibrary0(Unknown Source)

at java.lang.System.loadLibrary(Unknown Source)

at com.yiibai.CopyAndPasteAnImage.main(CopyAndPasteAnImage.java:13)

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