I am trying the make an app that recognizes it white is on screen. I have written code that take an RGBA mat and converts it to a one pixel gray mat. I am trying to see the value of the grayPixel so I know what to use when I make my loop. Everytime I put
Log.i("Mat Value", grayPixel.dump());
I get 90 no matter what I point the camera at. When I do
Log.i("Mat Value", grayPixel..toString());
I get the mat size of 1*1, which is correct, and the address of the camera.
import android.nfc.Tag;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceView;
import android.hardware.camera2.CameraCaptureSession;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfKeyPoint;
import org.opencv.core.MatOfPoint;
import org.opencv.imgproc.Imgproc;
import org.opencv.highgui.Highgui;
public class testActivity extends AppCompatActivity implements CvCameraViewListener2 {
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status){
switch (status){
case LoaderCallbackInterface.SUCCESS:
{
mOpenCvCameraView.enableView();
break;
}
default:
{
super.onManagerConnected(status);
}
}
}
};
private JavaCameraView mOpenCvCameraView;
Mat bgrPixel;
Mat grayPixel;
Mat rgbMat;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
mOpenCvCameraView = (JavaCameraView) findViewById(R.id.testVideoView);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
getSupportActionBar().hide();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
public void onResume() {
super.onResume();
if (!OpenCVLoader.initDebug()) {
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mLoaderCallback);
} else {
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
@Override
public void onPause() {
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
if(rgbMat == null){
rgbMat = inputFrame.rgba();
bgrPixel= rgbMat.submat(1,2,1,2).clone();
grayPixel = new Mat();
Imgproc.cvtColor(bgrPixel, grayPixel, Imgproc.COLOR_RGBA2GRAY, 1);
}
rgbMat= inputFrame.rgba();
Log.i("Mat Value", grayPixel.toString());
return rgbMat;
}
@Override
public void onCameraViewStarted(int width, int height) {
}
@Override
public void onCameraViewStopped() {
bgrPixel.release();
grayPixel.release();
rgbMat.release();
}
}
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