怎么在java中使用jni调用opencv对图像进行处理？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
1. 建立java文件
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数据库
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企业服务
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
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* 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: getImageFeatureByMemory
* Signature: ()I
*/
JNIEXPORT jint JNICALL Java_getImageFeature_getImageFeatureByMemory
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif3. 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 <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
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