java通过jni调用opencv处理图像的方法

java通过jni调用opencv处理图像的方法

1. 建立java文件

public class getImageFeature {

static{

System.loadLibrary("getImageFeatureDll");

}

public native int getImageFeatureByName(String filename);

public native int getImageFeatureByMemory();

publihttp://c 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

/* DO NOT EDIT THIS FILE - it is machine generated */

#include

/* Header for class getImageFeature */

#ifndef _Included_getImageFeature

#define _Included_getImageFeature

#ifdef __cplusplus

extern "C" {

#endif

/*

* Class: getImageFeature

* Method: getImageFeatureByName

* Signature: (Ljava/lang/String;)I

*/

JNIEXPORT jint JNICALL Java_getImageFeature_getImageFeatureByName

(JNIEnv *, jobject, jstring);

/*

* Class: getImageFeature

* Method: getImageFeatureByMemorxJcQJMOpgcy

* 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

#include "getImageFeatureDll.h"

#include

/*

* 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

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