如何在Android中提高Camera 2的图像质量？
我使用谷歌示例创建Android相机应用程序。 在几天内我无法解决输出图像质量问题。这是捕获照片/视频的基本片段。
public class Camera2BaseFragment extends Fragment implements View.OnTouchListener {
protected static final SparseIntArray DEFAULT_ORIENTATIONS = new SparseIntArray();
protected final String FRAGMENT_DIALOG = "dialog";
protected Integer[] mExposureCompensation = {};
protected String mCameraId = "0";
protected float mFingerSpacing = 0f;
protected double mZoomLevel = 1;
protected int mCurrentProgress = 0;
protected int mSensorOrientation;
protected ImageView mToolbarBackIcon;
protected TextView mTvZoomLevel;
protected Rect mZoomRect;
protected View mView;
protected Camera2FitTextureView mTextureView;
protected CameraCaptureSession mCaptureSession;
protected CameraDevice mCameraDevice;
protected Size mPreviewSize;
protected HandlerThread mBackgroundThread;
protected Handler mBackgroundHandler;
protected CaptureRequest.Builder mPreviewRequestBuilder;
protected Semaphore mCameraOpenCloseLock = new Semaphore(1);
private CameraCharacteristics mCharacteristics;
private float mRatio = 1.0f;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_camera2, container, false);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
try {
mCharacteristics = MainFragment.getCameraCharacteristics(getActivity());
if (mCharacteristics == null) return true;
if (mCharacteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM) == null)
return true;
float maxZoom = mCharacteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM) * 10;
Rect m = mCharacteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
if (m == null) return true;
float current_finger_spacing;
if (event.getPointerCount() > 1) {
// Multi touch logic
current_finger_spacing = getFingerSpacing(event);
if (mFingerSpacing != 0) {
if (current_finger_spacing > mFingerSpacing && maxZoom > mZoomLevel) {
//mZoomLevel++;
mZoomLevel = mZoomLevel + .5;
} else if (current_finger_spacing < mFingerSpacing && mZoomLevel > 1) {
//mZoomLevel--;
mZoomLevel = mZoomLevel - .5;
}
int minW = (int) (m.width() / maxZoom);
int minH = (int) (m.height() / maxZoom);
int difW = m.width() - minW;
int difH = m.height() - minH;
int cropW = difW / 100 * (int)mZoomLevel;
int cropH = difH / 100 * (int)mZoomLevel;
cropW -= cropW & 3;
cropH -= cropH & 3;
mZoomRect = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoomRect);
mRatio = (int)mZoomLevel >= 1 ? ((float)mZoomLevel / 10) : (float) mZoomLevel;
setZoomLevelText(mRatio);
}
mFingerSpacing = current_finger_spacing;
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, null);
} else {
// Single touch logic
}
} catch (CameraAccessException | NullPointerException e) {
//..
}
return true;
}
private void setZoomLevelText(float ratio) {
if(ratio <= 1.0f) ratio = 1.0f;
mTvZoomLevel.setText(String.format(Locale.US, "%.1fX", ratio));
}
private float getFingerSpacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return (float) Math.sqrt(x * x + y * y);
}
static class CompareSizesByArea implements Comparator<Size> {
@Override
public int compare(Size lhs, Size rhs) {
return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
(long) rhs.getWidth() * rhs.getHeight());
}
}
}
My Fragment for capture Photo
public class Camera2PhotoFragment extends Camera2BaseFragment
implements View.OnClickListener, ActivityCompat.OnRequestPermissionsResultCallback {
private static final int STATE_PREVIEW = 0;
private static final int STATE_WAITING_LOCK = 1;
private static final int STATE_WAITING_PRECAPTURE = 2;
private static final int STATE_WAITING_NON_PRECAPTURE = 3;
private static final int STATE_PICTURE_TAKEN = 4;
private static final int MAX_PREVIEW_WIDTH = 1920;
private static final int MAX_PREVIEW_HEIGHT = 1080;
private ImageReader mImageReader;
private File mFile = new File("ImagePath");
private final ImageReader.OnImageAvailableListener mOnImageAvailableListener
= new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader reader) {
mBackgroundHandler.post(new ImageSaver(reader.acquireLatestImage(), mFile,
mOnImageSavedListener));
}
};
private int mState = STATE_PREVIEW;
private boolean isEnabledCameraImg = true;
private final OnImageSavedListener mOnImageSavedListener = new OnImageSavedListener() {
@Override
public void onImageSavedSuccessfully() {
// Do something with saved image
isEnabledCameraImg = true;
}
};
private CameraCaptureSession.CaptureCallback mCaptureCallback
= new CameraCaptureSession.CaptureCallback() {
private void process(CaptureResult result) {
switch (mState) {
case STATE_PREVIEW: {
break;
}
case STATE_WAITING_LOCK: {
Integer afState = result.get(CaptureResult.CONTROL_AF_STATE);
if (afState == null) {
captureStillPicture();
} else if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState ||
CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) {
Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
if (aeState == null ||
aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
mState = STATE_PICTURE_TAKEN;
captureStillPicture();
} else {
runPrecaptureSequence();
}
} else {
mState = STATE_PICTURE_TAKEN;
captureStillPicture();
}
break;
}
case STATE_WAITING_PRECAPTURE: {
Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
if (aeState == null ||
aeState == CaptureResult.CONTROL_AE_STATE_PRECAPTURE ||
aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED) {
mState = STATE_WAITING_NON_PRECAPTURE;
}
break;
}
case STATE_WAITING_NON_PRECAPTURE: {
Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
if (aeState == null || aeState != CaptureResult.CONTROL_AE_STATE_PRECAPTURE) {
mState = STATE_PICTURE_TAKEN;
captureStillPicture();
}
break;
}
}
}
@Override
public void onCaptureProgressed(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureResult partialResult) {
process(partialResult);
}
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
process(result);
}
};
private final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice cameraDevice) {
mCameraOpenCloseLock.release();
mCameraDevice = cameraDevice;
createCameraPreviewSession();
}
};
private final TextureView.SurfaceTextureListener mSurfaceTextureListener
= new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture texture, int width, int height) {
openCamera(width, height);
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture texture, int width, int height) {
configureTransform(width, height);
}
};
public static Camera2PhotoFragment newInstance() {
return new Camera2PhotoFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
return mView;
}
@Override
public void onResume() {
super.onResume();
isEnabledCameraImg = true;
if (mTextureView.isAvailable()) {
openCamera(mTextureView.getWidth(), mTextureView.getHeight());
} else {
mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
}
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.imgCameraTakePicture: {
takePicture();
break;
}
}
}
private static Size chooseOptimalSize(Size[] choices, int textureViewWidth,
int textureViewHeight, int maxWidth, int maxHeight, Size aspectRatio) {
List<Size> bigEnough = new ArrayList<>();
List<Size> notBigEnough = new ArrayList<>();
int w = aspectRatio.getWidth();
int h = aspectRatio.getHeight();
for (Size option : choices) {
if (option.getWidth() <= maxWidth && option.getHeight() <= maxHeight &&
option.getHeight() == option.getWidth() * h / w) {
if (option.getWidth() >= textureViewWidth &&
option.getHeight() >= textureViewHeight) {
bigEnough.add(option);
} else {
notBigEnough.add(option);
}
}
}
if (bigEnough.size() > 0) {
return Collections.min(bigEnough, new CompareSizesByArea());
} else if (notBigEnough.size() > 0) {
return Collections.max(notBigEnough, new CompareSizesByArea());
} else {
return choices[0];
}
}
private void setUpCameraOutputs(int width, int height) {
Activity activity = getActivity();
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
for (String cameraId : manager.getCameraIdList()) {
CameraCharacteristics characteristics
= manager.getCameraCharacteristics(cameraId);
Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {
continue;
}
StreamConfigurationMap map = characteristics.get(
CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
if (map == null) {
continue;
}
Size largest = Collections.max(
Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)),
new CompareSizesByArea());
mImageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(),
ImageFormat.JPEG, /*maxImages*/2);
mImageReader.setOnImageAvailableListener(
mOnImageAvailableListener, mBackgroundHandler);
int displayRotation = activity.getWindowManager().getDefaultDisplay().getRotation();
mSensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
boolean swappedDimensions = false;
switch (displayRotation) {
case Surface.ROTATION_0: {
// do nothing
}
case Surface.ROTATION_180: {
if (mSensorOrientation == 90 || mSensorOrientation == 270) {
swappedDimensions = true;
}
break;
}
case Surface.ROTATION_90: {
// do nothing
}
case Surface.ROTATION_270: {
if (mSensorOrientation == 0 || mSensorOrientation == 180) {
swappedDimensions = true;
}
break;
}
}
Point displaySize = new Point();
activity.getWindowManager().getDefaultDisplay().getSize(displaySize);
int rotatedPreviewWidth = width;
int rotatedPreviewHeight = height;
int maxPreviewWidth = displaySize.x;
int maxPreviewHeight = displaySize.y;
if (swappedDimensions) {
rotatedPreviewWidth = height;
rotatedPreviewHeight = width;
maxPreviewWidth = displaySize.y;
maxPreviewHeight = displaySize.x;
}
if (maxPreviewWidth > MAX_PREVIEW_WIDTH) {
maxPreviewWidth = MAX_PREVIEW_WIDTH;
}
if (maxPreviewHeight > MAX_PREVIEW_HEIGHT) {
maxPreviewHeight = MAX_PREVIEW_HEIGHT;
}
mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
rotatedPreviewWidth, rotatedPreviewHeight, maxPreviewWidth,
maxPreviewHeight, largest);
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
mTextureView.setAspectRatio(
mPreviewSize.getWidth(), mPreviewSize.getHeight());
} else {
mTextureView.setAspectRatio(
mPreviewSize.getHeight(), mPreviewSize.getWidth());
}
mCameraId = cameraId;
return;
}
} catch (CameraAccessException e) {
//..
}
}
private void openCamera(int width, int height) {
setUpCameraOutputs(width, height);
configureTransform(width, height);
Activity activity = getActivity();
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Time out waiting to lock camera opening.");
}
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.CAMERA}, REQUEST_OPEN_CAMERA);
return;
}
manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
} catch (CameraAccessException | InterruptedException e) {
e.printStackTrace();
}
}
private void closeCamera() {
//...
}
private void createCameraPreviewSession() {
try {
SurfaceTexture texture = mTextureView.getSurfaceTexture();
assert texture != null;
texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
Surface surface = new Surface(texture);
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mPreviewRequestBuilder.addTarget(surface);
if (mZoomRect != null) {
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoomRect);
}
mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
if (null == mCameraDevice) {
return;
}
mCaptureSession = cameraCaptureSession;
try {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_AUTO);
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
mCaptureCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(
@NonNull CameraCaptureSession cameraCaptureSession) {
//...
}
}, null
);
} catch (CameraAccessException e) {
//..
}
}
private void configureTransform(int viewWidth, int viewHeight) {
Activity activity = getActivity();
if (null == mTextureView || null == mPreviewSize || null == activity) {
return;
}
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
Matrix matrix = new Matrix();
RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.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 / mPreviewSize.getHeight(),
(float) viewWidth / mPreviewSize.getWidth());
matrix.postScale(scale, scale, centerX, centerY);
matrix.postRotate(90 * (rotation - 2), centerX, centerY);
} else if (Surface.ROTATION_180 == rotation) {
matrix.postRotate(180, centerX, centerY);
}
mTextureView.setTransform(matrix);
}
private void takePicture() {
lockFocus();
}
private void lockFocus() {
try {
mState = STATE_WAITING_LOCK;
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, mBackgroundHandler);
} catch (CameraAccessException e) {
//..
}
}
private void runPrecaptureSequence() {
try {
mState = STATE_WAITING_PRECAPTURE;
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
} catch (CameraAccessException | NullPointerException e) {
//..
}
}
private void captureStillPicture() {
try {
final Activity activity = getActivity();
if (null == activity || null == mCameraDevice) {
return;
}
final CaptureRequest.Builder captureBuilder =
mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(mImageReader.getSurface());
if (mZoomRect != null) captureBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoomRect);
if (mCurrentProgress != 0) {
captureBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, mExposureCompensation[mCurrentProgress]);
}
captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CameraMetadata.CONTROL_AF_MODE_AUTO);
// Orientation
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));
captureBuilder.set(CaptureRequest.JPEG_QUALITY, (byte) 100);
CameraCaptureSession.CaptureCallback CaptureCallback
= new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
isEnabledCameraImg = true;
}
};
mCaptureSession.stopRepeating();
mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
unlockFocus();
if (mZoomRect != null)
mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, mZoomRect);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_AUTO);
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
mCaptureCallback, mBackgroundHandler);
} catch (Throwable e) {
//..
}
}
private int getOrientation(int rotation) {
return (DEFAULT_ORIENTATIONS.get(rotation) + mSensorOrientation + 270) % 360;
}
private void unlockFocus() {
try {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_IDLE);
mState = STATE_PREVIEW;
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
} catch (Throwable e) {
//..
}
}
interface OnImageSavedListener {
void onImageSavedSuccessfully();
}
private static class ImageSaver implements Runnable {
private final Image mImage;
private final File mFile;
private final OnImageSavedListener mOnImageSavedListener;
public ImageSaver(Image image, File file, OnImageSavedListener onImageSavedListener) {
mImage = image;
mFile = file;
mOnImageSavedListener = onImageSavedListener;
}
@Override
public void run() {
ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
buffer.get(bytes);
FileOutputStream output = null;
try {
output = new FileOutputStream(mFile);
output.write(bytes);
mOnImageSavedListener.onImageSavedSuccessfully();
} catch (IOException e) {
//..
} finally {
mImage.close();
if (null != output) {
try {
output.close();
} catch (IOException e) {
//..
}
}
}
}
}
相机预览和保存的图像之间存在图像质量差异。
在左侧：相机预览的屏幕截图（带缩放）
在右侧：捕获/保存的图像。左侧的图像更好。
如何为输出图像获得良好的图像质量？可能是缩放问题吗？
我在相机2文档中发现了CaptureRequest的以下常量：
captureBuilder.set(CaptureRequest.EDGE_MODE, CameraMetadata.EDGE_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.SHADING_MODE, CameraMetadata.SHADING_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.TONEMAP_MODE, CameraMetadata.TONEMAP_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.COLOR_CORRECTION_ABERRATION_MODE, CameraMetadata.COLOR_CORRECTION_ABERRATION_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.COLOR_CORRECTION_MODE, CameraMetadata.COLOR_CORRECTION_ABERRATION_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.HOT_PIXEL_MODE, CameraMetadata.HOT_PIXEL_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.NOISE_REDUCTION_MODE, CameraMetadata.NOISE_REDUCTION_MODE_HIGH_QUALITY);
captureBuilder.set(CaptureRequest.LENS_OPTICAL_STABILIZATION_MODE, CameraMetadata.LENS_OPTICAL_STABILIZATION_MODE_ON);
为了测试，我在代码的代码行下面添加了所有这些常量： captureBuilder.set（CaptureRequest.JPEG_QUALITY，（byte）100）;
但这并没有解决我的问题。
有人在相机2上有类似的图像质量问题，或者有人知道这个问题的原因吗？
感谢您的回复！
如果需要，我可以在github上传我的代码。
0 个答案:
没有答案
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？