Question

我想创建一个带有红色通道的项目，当我按下按钮时，它将进行图像处理（通道提取-红色通道），并且输出图像是灰度图像，但是当我合并时存在问题红色通道和灰度脚本。当我按下“灰色”按钮时，该应用程序已停止（无错误消息）。如果您可以解决我的问题，或者有另一种方法，请提供帮助，您所做的一切都是我对您的关心。

这是我的MainActivity.java

public class MainActivity extends AppCompatActivity {

ImageView imageView;
Uri imageUri;
Bitmap grayBitmap, imageBitmap;
Button button2;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView = (ImageView) findViewById(R.id.imageView);

    button2 = (Button) findViewById(R.id.button2);
    button3 = (Button) findViewById(R.id.button3);

    OpenCVLoader.initDebug();
}


public void openGallery (View v){
    Intent myIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

    startActivityForResult(myIntent,100);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 100 && resultCode == RESULT_OK && data !=null)
    {
        imageUri = data.getData();
        try
        {
            imageBitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageUri);
        } catch (IOException e)
        {
            e.printStackTrace();
        }

        imageView.setImageBitmap(imageBitmap);
    }
}

public void convertToGray(View v)
{
    Mat grayMat = new Mat();
    Mat redC = new Mat();

    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inDither=false;
    o.inSampleSize=4;

    int width = imageBitmap.getWidth();
    int height = imageBitmap.getHeight();

    grayBitmap= Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

    //red channel
for (int x = 0; x < imageBitmap.getWidth(); x++)
    {
        for (int y = 0; y < imageBitmap.getHeight(); y++)
        {
            redChannel.setPixel(x, y, imageBitmap.getPixel(x, y) & 0xFFFF0000);

        }
    }
    //bitmap to MAT

    Utils.bitmapToMat(imageBitmap,redC);

    Imgproc.cvtColor(redC, grayMat, Imgproc.COLOR_RGB2GRAY);

    Utils.matToBitmap(grayMat, grayBitmap);

    imageView.setImageBitmap(grayBitmap); }}

这是我的activity_main.xml

 <Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:onClick="openGallery"
    android:layout_alignParentBottom="true"
    android:layout_alignParentStart="true"
    android:text="@string/gallery" />

<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_marginStart="34dp"
    android:layout_toEndOf="@+id/button"
    android:onClick="convertToGray"
    android:text="@string/gray" />

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/button"
    android:layout_alignParentEnd="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    app:srcCompat="@mipmap/ic_launcher" />

如果您不理解或需要更多解释，请发表评论，谢谢

在Android Studio中结合此红色通道和灰度功能

0 个答案: