在Java语言编程中,如何使用Java将图片转换为灰度?
注意:需要访问网址:http://book2s.com/java/jar/o/opencv/download-opencv-3.2.0-0.html , 下载一个OpenCV软件包。这里下载最新版本: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:OpenCV3.2,并指配置构建路径为:D:\software\opencv\opencv\build\java\x64,如下图所示 -
注:可参考: http://blog.csdn.net/shawncheer/article/details/51098456
以下是使用Java将图像转换为灰度的程序 -
package com.yiibai;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class ConvertingImageToGrayScale {
public static void main(String args[]) throws Exception {
//Loading the OpenCV core library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME );
String input = "images/zhonglou.jpg";
//Reading the image
Mat src = Imgcodecs.imread(input);
//Creating the empty destination matrix
Mat dst = new Mat();
//Converting the image to gray scale and saving it in the dst matrix
Imgproc.cvtColor(src, dst, Imgproc.COLOR_RGB2GRAY);
//Writing the image
Imgcodecs.imwrite("images/zhonglouToGrayScale.jpg", dst);
System.out.println("Converted to Grayscale");
}
}
执行上面示例代码,得到以下结果 -
Converted to Grayscale
原图 -
在执行上面示例代码成功后,应该会在 F:\worksp\javaexamples\java_opencv\images 目录中有看到生成一个文件:zhonglouToGrayScale.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)
解决上述问题可通过参考: http://blog.csdn.net/shawncheer/article/details/51098456