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Open Source Computer Vision Library
https://opencv.org/
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35 lines
1.1 KiB
35 lines
1.1 KiB
#include <jni.h> |
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#include <opencv2/core/core.hpp> |
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#include <opencv2/imgproc/imgproc.hpp> |
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#include <opencv2/features2d/features2d.hpp> |
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#include <vector> |
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using namespace std; |
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using namespace cv; |
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extern "C" { |
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JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial3_Sample3View_FindFeatures(JNIEnv* env, jobject, jint width, jint height, jbyteArray yuv, jintArray bgra) |
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{ |
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jbyte* _yuv = env->GetByteArrayElements(yuv, 0); |
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jint* _bgra = env->GetIntArrayElements(bgra, 0); |
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Mat myuv(height + height/2, width, CV_8UC1, (unsigned char *)_yuv); |
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Mat mbgra(height, width, CV_8UC4, (unsigned char *)_bgra); |
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Mat mgray(height, width, CV_8UC1, (unsigned char *)_yuv); |
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//Please make attention about BGRA byte order |
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//ARGB stored in java as int array becomes BGRA at native level |
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cvtColor(myuv, mbgra, CV_YUV420sp2BGR, 4); |
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vector<KeyPoint> v; |
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FastFeatureDetector detector(50); |
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detector.detect(mgray, v); |
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for( size_t i = 0; i < v.size(); i++ ) |
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circle(mbgra, Point(v[i].pt.x, v[i].pt.y), 10, Scalar(0,0,255,255)); |
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env->ReleaseIntArrayElements(bgra, _bgra, 0); |
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env->ReleaseByteArrayElements(yuv, _yuv, 0); |
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} |
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}
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