1. 建立java文件
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public class getimagefeature { static{ system.loadlibrary("getimagefeaturedll"); } public native int getimagefeaturebyname(string filename); public native int getimagefeaturebymemory(); public static void main(string[] args) { getimagefeature test=new getimagefeature(); string filename = "d:/testpic/6af1399a64d10a399ad3247c01656bb7.jpg"; system.out.println(test.getimagefeaturebyname(filename)); } } |
2. 切换到工程src文件夹
javac getimagefeature.java
javah getimagefeature
生成 getimagefeature.h 文件
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/* do not edit this file - it is machine generated */#include <jni.h>/* header for class getimagefeature */#ifndef _included_getimagefeature#define _included_getimagefeature#ifdef __cplusplusextern "c" {#endif /* * class: getimagefeature * method: getimagefeaturebyname * signature: (ljava/lang/string;)i */ jniexport jint jnicall java_getimagefeature_getimagefeaturebyname (jnienv *, jobject, jstring); /* * class: getimagefeature * method: getimagefeaturebymemory * signature: ()i */ jniexport jint jnicall java_getimagefeature_getimagefeaturebymemory (jnienv *, jobject);#ifdef __cplusplus}#endif#endif |
3. vs2013建立dll工程
添加getimagefeature.h 头文件，再添加getimagefeature.cpp文件，实现对应函数（工程属性中需包含jdk下的include目录）
c:\program files\java\jdk1.8.0_20\include
c:\program files\java\jdk1.8.0_20\include\win32
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#include "getimagefeaturedll.h"#include <opencv2/opencv.hpp>/** class: getimagefeature* method: getimagefeaturebyname* signature: (ljava/lang/string;)i*/jniexport jint jnicall java_getimagefeature_getimagefeaturebyname(jnienv *env, jobject obj, jstring filename){ const char *str_filename; str_filename = env->getstringutfchars(filename, false); cv::mat image = cv::imread(str_filename); cv::imshow("test", image); cv::waitkey(20000); return 0;}/** class: getimagefeature* method: getimagefeaturebymemory* signature: ()i*/jniexport jint jnicall java_getimagefeature_getimagefeaturebymemory(jnienv *, jobject){ return 0;} |
编译生成对应的dll
4. 执行java程序
将生成dll复制到java工程src文件夹下，java xx 运行程序
以上这篇java通过jni调用opencv处理图像的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/ZengDong_1991/article/details/54312715
