Question

我正在开发一个检测黄色物体的应用程序，每当检测到物体时，它都会检测到物体。我面临的问题是它给我一个非常低的帧速率，大约每秒1-2帧。我想提高这个帧速率。请帮我。有没有办法降低分辨率，即使这会增加帧速率。这是我的代码：

package org.opencv.samples.imagemanipulations;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.util.Log;


import android.view.WindowManager;

public class ImageManipulationsActivity extends Activity implements     CvCameraViewListener2, TextToSpeech.OnInitListener {
private static final String  TAG                 = "OCVSample::Activity";

private CameraBridgeViewBase mOpenCvCameraView;


private Mat                  mRgba;

int count = 0;


private TextToSpeech myTTS;

private int MY_DATA_CHECK_CODE = 0;



private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");
                mOpenCvCameraView.enableView();
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

public ImageManipulationsActivity() {
    Log.i(TAG, "Instantiated new " + this.getClass());
}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    Log.i(TAG, "called onCreate");
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    setContentView(R.layout.image_manipulations_surface_view);

    myTTS= new TextToSpeech(this,this);
     Intent checkTTSIntent = new Intent();
        checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);
    mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.image_manipulations_activity_surface_view);
    mOpenCvCameraView.setCvCameraViewListener(this);
}

@Override
public void onPause()
{
    super.onPause();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}

@Override
public void onResume()
{
    super.onResume();
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}

public void onDestroy() {
    super.onDestroy();
    if (mOpenCvCameraView != null)
        mOpenCvCameraView.disableView();
}




public void onCameraViewStarted(int width, int height) {

    mRgba = new Mat();

    new Size();
    new Mat();
}



public void onCameraViewStopped() {
    // Explicitly deallocate Mats


    if (mRgba != null)
        mRgba.release();



    mRgba = null;


}

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
    mRgba = inputFrame.rgba();

    Size s=mRgba.size();

    for (int i = 0; i < s.height; i++) {
        for (int j = 0; j < s.width; j++) {


            double[] rgb=mRgba.get(i,j);

        double  a=rgb[0];
        double  b=rgb[1];
        double  c=rgb[2];


            if ((a>=225) && (a<=240) && (b>=215) && (b<= 230) && (c>=90) && (c<= 150)) {
                count=count++;
            }
        }
    }

    if (count>1000) {

        myTTS.speak("object detected", TextToSpeech.QUEUE_FLUSH, null);

    }
    return mRgba;
}

protected void onActivityResult1(int requestCode, int resultCode, Intent data) {

    if (requestCode == MY_DATA_CHECK_CODE) {
        if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {

        myTTS = new TextToSpeech(this, this);
        }
        else {

            Intent installTTSIntent = new Intent();
            installTTSIntent.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
            startActivity(installTTSIntent);
        }
    }
}


public void onInit(int initStatus) {


    if (initStatus == TextToSpeech.SUCCESS) {
        if(myTTS.isLanguageAvailable(Locale.US)==TextToSpeech.LANG_AVAILABLE)
            myTTS.setLanguage(Locale.US);
    }
    else if (initStatus == TextToSpeech.ERROR) {
        Toast.makeText(this, "Sorry! Text To Speech failed...", Toast.LENGTH_LONG).show();
    }
}
}

Answer 1

显然，你的大部分时间都花在onCameraFrame上。现在你正在检查每个像素，但你不必这样做。如果（0,0）不是黄色，那么（0,1）可能也不是。

尝试检查每10个像素。如果这些像素中的任何一个是黄色，则在黄色像素周围进行二次全分辨率扫描。

for (int i = 0; i < s.height; i+=10)
    for (int j = 0; j < s.width; j+=10)
        if(yellow)    
            addPixelToListToCheckLater(i, j);

while(pixels still remain to be double checked){
    currenti = nextIInList;
    currentj = nextJInList;

    for (int i = currenti - 10; i < currenti + 10; i++)
        for (int j = currentj - 10; j < currentj + 10; j++)
            if(yellow)    
                count++;

}

提高android + opencv项目的帧率

1 个答案: