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How to increase image quality in android camera2 api

N

nagamothu

Newbie
Hi guys, in my app i have added custom camera using camera2, but the captured image is of 300kb and 240 X 320 resolution. and looks blurry. How can i increase quality of image?
 
wseng92 said:
Can you post your code?
Click to expand...
Code: 
public class Custom_CameraActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private static final String CAMERA_BACK = "0" ;
    public static Bitmap rotatedBitmap;
    private ImageButton takePictureButton;
    private TextureView textureView;
    public static Bitmap loadedImage,loadedImage1;

    private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
    static {
        ORIENTATIONS.append( Surface.ROTATION_0, 90);
        ORIENTATIONS.append(Surface.ROTATION_90, 0);
        ORIENTATIONS.append(Surface.ROTATION_180, 270);
        ORIENTATIONS.append(Surface.ROTATION_270, 180);
    }
    private String cameraId = CAMERA_BACK;
    protected CameraDevice cameraDevice;
    protected CameraCaptureSession cameraCaptureSessions;
    protected CaptureRequest captureRequest;
    protected CaptureRequest.Builder captureRequestBuilder;
    private Size imageDimension;
    private ImageReader imageReader;
    private File file;
    private static final int REQUEST_CAMERA_PERMISSION = 200;
    private boolean mFlashSupported;
    private Handler mBackgroundHandler;
    private HandlerThread mBackgroundThread;

    private ImageButton capture,close_camera,flashCameraButton;

    private boolean isTorchOn;
    private CameraManager cameraManager;
    private boolean isFlashSupported;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_custom__camera );
        textureView = (TextureView) findViewById(R.id.texture);
        assert textureView != null;
        textureView.setSurfaceTextureListener(textureListener);

        getWindow().addFlags( WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON );

        capture = (ImageButton) findViewById( R.id.captureImage );
        capture.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                takePicture();
            }
        } );

    
        flashCameraButton = (ImageButton) findViewById( R.id.flash );
        isTorchOn=false;
        flashCameraButton.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switchFlash();
            }
        } );

    }

    private void switchFlash() {
        try {
            if (cameraId.equals(CAMERA_BACK)) {
                if (isFlashSupported) {
                    if (isTorchOn) {
                        captureRequestBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_OFF);
                        cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, null);
                        flashCameraButton.setImageResource(R.drawable.bulboff);
                        isTorchOn = false;
                    } else {
                        captureRequestBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_TORCH);
                        cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, null);
                        flashCameraButton.setImageResource(R.drawable.bulb);
                        isTorchOn = true;
                    }
                }
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    TextureView.SurfaceTextureListener textureListener = new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
            configureTransform(width,height);
            //open your camera here
            openCamera();
        }
        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
            // Transform you image captured size according to the surface width and height
            configureTransform(width,height);
        }
        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
            return false;
        }
        @Override
        public void onSurfaceTextureUpdated(SurfaceTexture surface) {
        }
    };
    private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(CameraDevice camera) {
            //This is called when the camera is open
            Log.e(TAG, "onOpened");
            cameraDevice = camera;
            createCameraPreview();
            if(null != textureView ){
                configureTransform(textureView.getWidth(),textureView.getHeight());
            }
        }

        @Override
        public void onDisconnected(CameraDevice camera) {
            cameraDevice.close();
        }

        @Override
        public void onError(CameraDevice camera, int error) {
            cameraDevice.close();
            cameraDevice = null;
        }
    };


    private void configureTransform(int viewWidth, int viewHeight) {
        if (null == textureView || null == imageDimension) {
            return;
        }
        int rotation = getWindowManager().getDefaultDisplay().getRotation();
        Matrix matrix = new Matrix();
        RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
        RectF bufferRect = new RectF(0, 0, imageDimension.getHeight(), imageDimension.getWidth());
        float centerX = viewRect.centerX();
        float centerY = viewRect.centerY();
        if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
            bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
            matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
            float scale = Math.max(
                    (float) viewHeight / imageDimension.getHeight(),
                    (float) viewWidth / imageDimension.getWidth());
            matrix.postScale(scale, scale, centerX, centerY);
            matrix.postRotate(90 * (rotation - 2), centerX, centerY);
        }
        textureView.setTransform(matrix);
    }

    final CameraCaptureSession.CaptureCallback captureCallbackListener = new CameraCaptureSession.CaptureCallback() {
        @Override
        public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
            super.onCaptureCompleted(session, request, result);
            Toast.makeText(Custom_CameraActivity.this, "Saved:" + file, Toast.LENGTH_SHORT).show();
            createCameraPreview();
        }
    };
    protected void startBackgroundThread() {
        mBackgroundThread = new HandlerThread("Camera Background");
        mBackgroundThread.start();
        mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
    }
    protected void stopBackgroundThread() {
        mBackgroundThread.quitSafely();
        try {
            mBackgroundThread.join();
            mBackgroundThread = null;
            mBackgroundHandler = null;
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    protected void takePicture() {
        if(null == cameraDevice) {
            Log.e(TAG, "cameraDevice is null");
            return;
        }
        CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        try {
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraDevice.getId());
            Size[] jpegSizes = null;
            if (characteristics != null) {
                jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes( ImageFormat.JPEG);
            }
            int width = 640;
            int height = 480;
            if (jpegSizes != null && 0 < jpegSizes.length) {
                width = jpegSizes[0].getWidth();
                height = jpegSizes[0].getHeight();
            }
            ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
            List<Surface> outputSurfaces = new ArrayList <Surface>(2);
            outputSurfaces.add(reader.getSurface());
            outputSurfaces.add(new Surface(textureView.getSurfaceTexture()));
            final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
            captureBuilder.addTarget(reader.getSurface());
            //Flash
            if(isTorchOn){
                captureBuilder.set(captureRequest.CONTROL_AE_MODE,CameraMetadata.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
           captureBuilder.set( CaptureRequest.FLASH_MODE,CameraMetadata.FLASH_MODE_SINGLE );
            }else{
                captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_ON);
                captureBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_OFF);
            }
            captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
          
            //Quality
            captureBuilder.set(CaptureRequest.JPEG_QUALITY, (byte) 100 );
            // Orientation
            int rotation = getWindowManager().getDefaultDisplay().getRotation();
            captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
            ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
                @Override
                public void onImageAvailable(ImageReader reader) {

                    Image image = null;
                    try {
                        image = reader.acquireLatestImage();
                        ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                        buffer.rewind();
                        byte[] bytes = new byte[buffer.capacity()];
                        buffer.get(bytes);
                        loadedImage1 = BitmapFactory.decodeByteArray( bytes, 0, bytes.length );

                          } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        if (image != null) {
                            image.close();
                        }
                    }
                }

            };
            reader.setOnImageAvailableListener(readerListener, mBackgroundHandler);
            final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
                @Override
                public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {
                    super.onCaptureCompleted(session, request, result);

                    SimpleDocumentScannerActivity.startScanner(Custom_CameraActivity.this, pathCamera, "");
                }
            };
            cameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(CameraCaptureSession session) {
                    try {
                        session.capture(captureBuilder.build(), captureListener, mBackgroundHandler);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                @Override
                public void onConfigureFailed(CameraCaptureSession session) {
                }
            }, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }


    }

    protected void createCameraPreview() {
        try {
            SurfaceTexture texture = textureView.getSurfaceTexture();
            assert texture != null;
            texture.setDefaultBufferSize(imageDimension.getWidth(), imageDimension.getHeight());
            Surface surface = new Surface(texture);
            captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            captureRequestBuilder.addTarget(surface);
            cameraDevice.createCaptureSession( Arrays.asList(surface), new CameraCaptureSession.StateCallback(){
                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    //The camera is already closed
                    if (null == cameraDevice) {
                        return;
                    }
                    // When the session is ready, we start displaying the preview.
                    cameraCaptureSessions = cameraCaptureSession;
                    updatePreview();
                }
                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                    Toast.makeText(Custom_CameraActivity.this, "Configuration change", Toast.LENGTH_SHORT).show();
                }
            }, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void openCamera() {
        CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        Log.e(TAG, "is camera open");
        try {
            cameraId = manager.getCameraIdList()[0];
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
            StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            assert map != null;
            imageDimension = map.getOutputSizes(SurfaceTexture.class)[0];

            //flash button code
            Boolean available =characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
            isFlashSupported = available == null ? false : available;
            setupFlashButton();
            // Add permission for camera and let user grant the permission
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(Custom_CameraActivity.this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CAMERA_PERMISSION);
                return;
            }
            manager.openCamera(cameraId, stateCallback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
        Log.e(TAG, "openCamera X");
    }




    private void setupFlashButton() {
        if (cameraId.equals(CAMERA_BACK) && isFlashSupported) {
            flashCameraButton.setVisibility(View.VISIBLE);

            if (isTorchOn) {
                flashCameraButton.setImageResource(R.drawable.bulboff);
            } else {
                flashCameraButton.setImageResource(R.drawable.bulb);
            }

        } else {
            flashCameraButton.setVisibility(View.GONE);
        }
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    protected void updatePreview() {
        if(null == cameraDevice) {
            Log.e(TAG, "updatePreview error, return");
        }
        captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
        try {
            cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(), null, mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
 
Last edited:
Maybe you've just got a crap quality camera on your phone?
 
Sagar Shah said:
The only way you have to increase your image quality is increasing your ImageReaderSize to the biggest resolution:

Code: 
mImageReader = ImageReader.newInstance(pictureSizeValue.getWidth(), pictureSizeValue.getHeight(), format, maxImages);

Also, you can improve the quality using the key CaptureRequest.JPEG_QUALITY in your CaptureRequest.

Java: 
mCaptureRequestBuilder.set(CaptureRequest.JPEG_QUALITY, (byte) 100);

More: https://stackoverflow.com/questions...-using-camera-2-api-android/41809079#41809079
Click to expand...
Yes Done it already.Any other Way
 

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