1#include <jni.h>
2#include <opencv2/core/core.hpp>
3#include <opencv2/imgproc/imgproc.hpp>
4#include <opencv2/features2d/features2d.hpp>
5#include <vector>
6
7using namespace std;
8using namespace cv;
9
10extern "C" {
11JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba);
12
13JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)
14{
15    Mat& mGr  = *(Mat*)addrGray;
16    Mat& mRgb = *(Mat*)addrRgba;
17    vector<KeyPoint> v;
18
19    Ptr<FeatureDetector> detector = FastFeatureDetector::create(50);
20    detector->detect(mGr, v);
21    for( unsigned int i = 0; i < v.size(); i++ )
22    {
23        const KeyPoint& kp = v[i];
24        circle(mRgb, Point(kp.pt.x, kp.pt.y), 10, Scalar(255,0,0,255));
25    }
26}
27}
28