mkdir helloworld
cd helloworld/
vi HelloWorld.java
javac HelloWorld.java
javah -jni HelloWorld
vi HelloWorld.h
vi HelloWorld.c
cc -I /usr/lib/jvm/java-1.5.0-gcj/include/linux/ -I /usr/lib/jvm/java-1.5.0-gcj/include/ -I/usr/local/opencv/include/opencv -L/usr/local/opencv/lib -lcv -lhighgui -fPIC -shared -o libHelloWorld.so HelloWorld.c
java HelloWorld
java -Djava.library.path='.' HelloWorld
HelloWorld.c源码:
#include <jni.h>
#include "cv.h"
#include "highgui.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <float.h>
#include <limits.h>
#include <ctype.h>
int ImageAdjust(IplImage *src,IplImage *dst,
double low,double high, //x direction
double bottom,double top, //y direction
double gamma);
// int main(void)
int ImageAdjust(IplImage* src, IplImage* dst,
double low, double high, // X方向:low and high are the intensities of src
double bottom, double top, // Y方向:mapped to bottom and top of dst
double gamma )
{
double low2 = low*255;
double high2 = high*255;
double bottom2 = bottom*255;
double top2 = top*255;
double err_in = high2 - low2;
double err_out = top2 - bottom2;
int x,y;
double val;
if(low<0 && low>1 && high <0 && high>1&&
bottom<0 && bottom>1 && top<0 && top>1 && low>high)
return -1;
// intensity transform
for( y = 0; y < src->height; y++)
{
for (x = 0; x < src->width; x++)
{
val = ((uchar*)(src->p_w_picpathData + src->widthStep*y))[x];
val=pow((val - low2)/err_in, gamma)*err_out+bottom2;
if(val>255)
val=255;
if(val<0)
val=0; // Make sure src is in the range [low,high]
((uchar*)(dst->p_w_picpathData + dst->widthStep*y))[x] = (uchar) val;
}
}
return 0;
}
//JNIEXPORT jint JNICALL Java_com_opencvtest_opencvtest_getKeypointNum(JNIEnv* env,jobject thiz)
JNIEXPORT void JNICALL Java_HelloWorld_print(JNIEnv* env,jobject thiz)
{
//char *filename="../Histogram/Equalize DarkClouds.jpg";
char *filename="lena.jpg";
IplImage *dst,*src = cvLoadImage(filename,0);
if(!src)
{
printf("Couldn't seem to Open %s, sorry\n",filename);
return -1;
}
// cvNamedWindow( "src", 1 );
// cvNamedWindow( "result", 1 );
// Image adjust
dst = cvCloneImage(src);
// 输入参数 [0,0.5] 和 [0.5,1], gamma=1
// if( ImageAdjust( src, dst, 0, 0.5, 0.5, 1, 1)!=0)
if( ImageAdjust( src, dst, 0, 1, 1, 0, 1)!=0)
return -1;
// cvShowImage( "src", src );
// cvShowImage( "result", dst );
cvSaveImage("conre.jpg",dst,0);
cvSaveImage("consrc.jpg",src,0);
// cvWaitKey(0);
// cvDestroyWindow("src");
// cvDestroyWindow("result");
cvReleaseImage( &src );
cvReleaseImage( &dst );
return 0;
}
HelloWorld.h源码:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloWorld */
#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: HelloWorld
* Method: print
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_HelloWorld_print
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif
HelloWorld.java源码:
class HelloWorld
{
private native void print();
public static void main(String[] args)
{
new HelloWorld().print();
}
static
{
System.loadLibrary("HelloWorld");
}
}