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    <p>This is the OpenCV Tutorial code for Android. I remember that it took a while for me to understand the JNI convention. Just look into JNI code first </p> <pre><code>#include &lt;jni.h&gt; #include &lt;opencv2/core/core.hpp&gt; #include &lt;opencv2/imgproc/imgproc.hpp&gt; #include &lt;opencv2/features2d/features2d.hpp&gt; #include &lt;vector&gt; using namespace std; using namespace cv; extern "C" { JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial3_Sample3View_FindFeatures(JNIEnv* env, jobject thiz, jint width, jint height, jbyteArray yuv, jintArray bgra) { jbyte* _yuv = env-&gt;GetByteArrayElements(yuv, 0); jint* _bgra = env-&gt;GetIntArrayElements(bgra, 0); Mat myuv(height + height/2, width, CV_8UC1, (unsigned char *)_yuv); Mat mbgra(height, width, CV_8UC4, (unsigned char *)_bgra); Mat mgray(height, width, CV_8UC1, (unsigned char *)_yuv); //Please make attention about BGRA byte order //ARGB stored in java as int array becomes BGRA at native level cvtColor(myuv, mbgra, CV_YUV420sp2BGR, 4); vector&lt;KeyPoint&gt; v; FastFeatureDetector detector(50); detector.detect(mgray, v); for( size_t i = 0; i &lt; v.size(); i++ ) circle(mbgra, Point(v[i].pt.x, v[i].pt.y), 10, Scalar(0,0,255,255)); env-&gt;ReleaseIntArrayElements(bgra, _bgra, 0); env-&gt;ReleaseByteArrayElements(yuv, _yuv, 0); } } </code></pre> <p>and then Java code</p> <pre><code>package org.opencv.samples.tutorial3; import android.content.Context; import android.graphics.Bitmap; class Sample3View extends SampleViewBase { public Sample3View(Context context) { super(context); } @Override protected Bitmap processFrame(byte[] data) { int frameSize = getFrameWidth() * getFrameHeight(); int[] rgba = new int[frameSize]; FindFeatures(getFrameWidth(), getFrameHeight(), data, rgba); Bitmap bmp = Bitmap.createBitmap(getFrameWidth(), getFrameHeight(), Bitmap.Config.ARGB_8888); bmp.setPixels(rgba, 0/* offset */, getFrameWidth() /* stride */, 0, 0, getFrameWidth(), getFrameHeight()); return bmp; } public native void FindFeatures(int width, int height, byte yuv[], int[] rgba); static { System.loadLibrary("native_sample"); } } </code></pre>
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