分別使用OpenCV for Android應用程序顯示紅色藍色和綠色值

我正在嘗試創建一個應用程序，在該應用程序中我將相機指向某個內容，並且該應用程序將顯示對象的紅色藍色和綠色。我正在使用OpenCV庫在android studio中開發應用程序。我已成功完成所有設置並可以轉換實況視頻的色彩空間。但是，我無法分別顯示R，G和B值。說實話，我不知道該怎麼做。我已經完成了谷歌搜索，並在C++中得到了一些幫助，但是對於java沒有找到太多幫助。分別使用OpenCV for Android應用程序顯示紅色藍色和綠色值

我的活動文件是這樣的

package com.example.virus.bloodpressurereader; 
import android.hardware.Camera; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.SurfaceView; 

import org.opencv.android.BaseLoaderCallback; 
import org.opencv.android.CameraBridgeViewBase; 
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.dnn.Importer; 
import org.opencv.imgproc.Imgproc; 

public class VideoRecordingActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{ 

//custom toolbar 
private Toolbar toolbar; 

//java camera view 
JavaCameraView javaCameraView; 

Mat mRgba, rgb_scale; 


//callback loader 
BaseLoaderCallback mCallBackLoader = new BaseLoaderCallback(this) { 
    @Override 
    public void onManagerConnected(int status) { 


     switch (status){ 
      case BaseLoaderCallback.SUCCESS: 
       javaCameraView.enableView(); 
       break; 
      default: 
       super.onManagerConnected(status); 
       break; 
     } 
    } 
}; 


public static String TAG="VideoRecordingActivity"; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_video_recording); 

    //custom toolbar 
    toolbar = (Toolbar)findViewById(R.id.nav_action); 
    setSupportActionBar(toolbar); 


    //connect the camera 
    javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view); 

    //set visibility 
    javaCameraView.setVisibility(SurfaceView.VISIBLE); 
    //set callback function 
    javaCameraView.setCvCameraViewListener(this); 


} 

@Override 
protected void onPause() { 
    super.onPause(); 

    if(javaCameraView!=null){ 
     javaCameraView.disableView(); 
    } 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (javaCameraView!=null){ 
     javaCameraView.disableView(); 
    } 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    if (OpenCVLoader.initDebug()){ 
     Log.d(TAG, "Connected"); 

     //display when the activity resumed,, callback loader 
     mCallBackLoader.onManagerConnected(LoaderCallbackInterface.SUCCESS); 


    }else{ 
     Log.d(TAG, "Not connected"); 
     OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mCallBackLoader); 
    } 
} 

@Override 
public void onCameraViewStarted(int width, int height) { 
    //4 channel 
    mRgba = new Mat(height, width, CvType.CV_8UC4); 
    //rgb_scale = new Mat(height, width, CvType.CV_8UC1); 
} 

@Override 
public void onCameraViewStopped() { 
    //release 
    mRgba.release(); 
} 

@Override 
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) { 
    //get each frame from camera\ 
    mRgba = inputFrame.rgba(); 

    //Imgproc.cvtColor(mRgba, rgb_scale, Imgproc.COLOR_RGB2HSV); 

    return mRgba; 
} 
}

注：我沒有textviews顯示紅色藍色和綠色，我想只要登錄值了。

來源

2017-09-16 Mill3r

檢查這可能會幫助你：https://stackoverflow.com/q/44017224/4146722 –

謝謝你的建議。我目前在外面。一旦我得到，我會通過它.. – Mill3r

你提供給我的鏈接實際上並沒有幫助。我一直試圖解決這個問題很長一段時間。鏈接中的問題以某種方式起作用，以提供rgb值，但幀速率降至2fps。除此之外，我無法讓它發揮作用。 – Mill3r

public class VideoRecordingActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{ 

//custom toolbar 
private Toolbar toolbar; 

//java camera view 
JavaCameraView javaCameraView; 

Mat mRgba, mHsv; 

//callback loader 
BaseLoaderCallback mCallBackLoader = new BaseLoaderCallback(this) { 
    @Override 
    public void onManagerConnected(int status) { 


     switch (status){ 
      case BaseLoaderCallback.SUCCESS: 
       javaCameraView.enableView(); 
       break; 
      default: 
       super.onManagerConnected(status); 
       break; 
     } 
    } 
}; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_video_recording); 

    //custom toolbar 
    toolbar = (Toolbar)findViewById(R.id.nav_action); 
    setSupportActionBar(toolbar); 

    //connect the camera 
    javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view); 

    //set visibility 
    javaCameraView.setVisibility(SurfaceView.VISIBLE); 
    javaCameraView.setMaxFrameSize(320, 240); 

    javaCameraView.enableFpsMeter(); 
    javaCameraView.clearFocus(); 

    //set callback function 
    javaCameraView.setCvCameraViewListener(this); 


} 

@Override 
protected void onPause() { 
    super.onPause(); 

    if(javaCameraView!=null){ 
     javaCameraView.disableView(); 
    } 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    if (javaCameraView!=null){ 
     javaCameraView.disableView(); 
    } 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    if (OpenCVLoader.initDebug()){ 
     Log.d("openCV", "Connected"); 

     //display when the activity resumed,, callback loader 
     mCallBackLoader.onManagerConnected(LoaderCallbackInterface.SUCCESS); 


    }else{ 
     Log.d("openCV", "Not connected"); 
     OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mCallBackLoader); 
    } 
} 

@Override 
public void onCameraViewStarted(int width, int height) { 
    //4 channel 
    mRgba = new Mat(width, height, CvType.CV_8UC4); 
    mHsv = new Mat(width, height, CvType.CV_8UC3); 

} 

@Override 
public void onCameraViewStopped() { 
    //release 
    mRgba.release(); 
} 

@Override 
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) { 
    //get each frame from camera 
    mRgba = inputFrame.rgba(); 


    /**********HSV conversion**************/ 
    //convert mat rgb to mat hsv 
    Imgproc.cvtColor(mRgba, mHsv, Imgproc.COLOR_RGB2HSV); 

    //find scalar sum of hsv 
    Scalar mColorHsv = Core.sumElems(mHsv); 

    int pointCount = 320*240; 


    //convert each pixel 
    for (int i = 0; i < mColorHsv.val.length; i++) { 
     mColorHsv.val[i] /= pointCount; 
    } 

    //convert hsv scalar to rgb scalar 
    Scalar mColorRgb = convertScalarHsv2Rgba(mColorHsv); 

    /*Log.d("intensity", "Color: #" + String.format("%02X", (int)mColorHsv.val[0]) 
      + String.format("%02X", (int)mColorHsv.val[1]) 
      + String.format("%02X", (int)mColorHsv.val[2]));*/ 
    //print scalar value 
    //Log.d("intensity", "R:"+ String.valueOf(mColorRgb.val[0])+" G:"+String.valueOf(mColorRgb.val[1])+" B:"+String.valueOf(mColorRgb.val[2])); 


    /*Convert to YUV*/ 

    int R = (int) mColorRgb.val[0]; 
    int G = (int) mColorRgb.val[1]; 
    int B = (int) mColorRgb.val[2]; 

    int Y = (int) (R * .299000 + G * .587000 + B * .114000); 
    int U = (int) (R * -.168736 + G * -.331264 + B * .500000 + 128); 
    int V = (int) (R * .500000 + G * -.418688 + B * -.081312 + 128); 

    //int I = (R+G+B)/3; 


    //Log.d("intensity", "I: "+String.valueOf(I)); 
    //Log.d("intensity", "Y:"+ String.valueOf(Y)+" U:"+String.valueOf(U)+" V:"+String.valueOf(V)); 

    /*calibration*/ 


    return mRgba; 

} 



//convert Mat hsv to scalar 
private Scalar convertScalarHsv2Rgba(Scalar hsvColor) { 
    Mat pointMatRgba = new Mat(); 
    Mat pointMatHsv = new Mat(1, 1, CvType.CV_8UC3, hsvColor); 
    Imgproc.cvtColor(pointMatHsv, pointMatRgba, Imgproc.COLOR_HSV2RGB); 

    return new Scalar(pointMatRgba.get(0, 0)); 
} 
}

來源

2017-09-21 20:16:33 Mill3r

分別使用OpenCV for Android應用程序顯示紅色藍色和綠色值

回答

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