nbun's profile - activity

Its the other way around, when my camera is far from screen the rgb are correct, but when its right up to it its more than 100 even if the screen is black.

I'm writing a program that test for display lag. I have a variables that tell me the rgb values of a pixel so I use System.nanotime with and an empty while loop that ends when the rgb variables reaches 100, combined with the subtraction of another System.nanotimeafter the loop to get the amount of time for a color to show up (second System.nanotime - first System.nanotime). I get the time in nanoseconds and divide it by 1,000,000 so I can get the time in milliseconds, the issue is that rgb is alway over 100 when i have it right up to the display, even when a white square is on the display. When I back the camera about a foot away the rgb seem normal. Is there a way to make the rgb values normal when it is close up to the display?

I need to sample a 1x1 Mat that is converted to an int. When I make a loop like this

while (grayVal <= 100){
            Log.i("Mat Value", String.valueOf(grayVal));                
        }

grayVal never changes, I know that I need to resample grayVal and pass it back into the loop. How would I go about doing this.

edit: here is my code http://pastebin.com/4HA9H39f

I want the loop run until grayVal get hits the right value

How would I take grayVal and sample it over and over again till it reaches the right int?

I want to compare a 1x1 Mat to an int to see if it passes a threshold. I do not know how to do this on android.

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    rgbMat = inputFrame.rgba();
    bgrPixel= rgbMat.submat(1,2,1,2).clone();
    grayPixel = new Mat();
    Imgproc.cvtColor(bgrPixel, grayPixel, Imgproc.COLOR_RGBA2GRAY, 1);
    return rgbMat;
}

I got it to work thank you so much!!

I got rid of if(rgbMat == null){ but am not getting the value of grayPixel.

how would you suggest I fix this?

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();
}


}