[英]Camera2 preview and captured image looks different
默認情況下,我得到一個旋轉 -90 度的捕獲圖像,我需要將它旋轉回來,但它的高度與屏幕的高度不同,所以我的圖像沒有填滿屏幕。
在照片后的橫向模式下,它只顯示捕獲圖像的右上角..
我嘗試了所有可用的示例,但找不到解決方案。
private void SetUpCameraOutputs(int width, int height)
{
_manager = (CameraManager)_context.GetSystemService(Context.CameraService);
string[] cameraIds = _manager.GetCameraIdList();
_cameraId = cameraIds[0];
CameraCharacteristics chararc = _manager.GetCameraCharacteristics(cameraIds[i])
var characteristics = _manager.GetCameraCharacteristics(_cameraId);
var map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
if (_supportedJpegSizes == null && characteristics != null){
_supportedJpegSizes = ((StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap)).GetOutputSizes((int)ImageFormatType.Jpeg);
}
if (_supportedJpegSizes != null && _supportedJpegSizes.Length > 0){
_idealPhotoSize = GetOptimalSize(_supportedJpegSizes, 1050, 1400);
}
_imageReader = ImageReader.NewInstance(_idealPhotoSize.Width, _idealPhotoSize.Height, ImageFormatType.Jpeg, 1);
var readerListener = new ImageAvailableListener();
readerListener.Photo += (sender, buffer) =>
{
Photo?.Invoke(this, buffer);
};
_flashSupported = HasFLash(characteristics);
_imageReader.SetOnImageAvailableListener(readerListener, _backgroundHandler);
_previewSize = GetOptimalSize(map.GetOutputSizes(Class.FromType(typeof(SurfaceTexture))), _idealPhotoSize.Height, _idealPhotoSize.Width);
}
拍照方法:
public void TakePhoto()
{
if (_context == null || CameraDevice == null) return;
if (_captureBuilder == null)
_captureBuilder = CameraDevice.CreateCaptureRequest(CameraTemplate.StillCapture);
_captureBuilder.AddTarget(_imageReader.Surface);
_captureBuilder.Set(CaptureRequest.ControlAfMode, (int)ControlAFMode.ContinuousPicture);
var windowManager = _context.GetSystemService(Context.WindowService).JavaCast<IWindowManager>();
var rotation = windowManager.DefaultDisplay.Rotation;
_captureBuilder.Set(CaptureRequest.JpegOrientation, new Integer(Orientations.Get((int)rotation)));
_previewSession.StopRepeating();
_previewSession.Capture(_captureBuilder.Build(),
new CameraCaptureStillPictureSessionCallback
{
OnCaptureCompletedAction = session =>
{
UnlockFocus();
}
}, null);
}
還有我的 OnPhoto 方法:
private void OnPhoto(object sender, byte[] imgSource)
{
Android.Graphics.Bitmap bitmap = BitmapFactory.DecodeByteArray(imgSource, 0, imgSource.Length);
var windowManager = _context.GetSystemService(Context.WindowService).JavaCast<IWindowManager>();
var rotation = windowManager.DefaultDisplay.Rotation;
if (rotation == SurfaceOrientation.Rotation0 || rotation == SurfaceOrientation.Rotation180)
{
bitmap = resizeAndRotate(bitmap, bitmap.Width, bitmap.Height); //rotate bitmap by 90
}
var SkBitmap = bitmap.ToSKBitmap();
Application.Current.Properties["bitmap"] = SkBitmap;
Device.BeginInvokeOnMainThread(() =>
{
_currentElement?.PictureTaken();
});
}
在為縱向模式創建位圖時,您必須更改位圖的寬度和高度。 所以寬度變成高度,高度變成縱向圖像的寬度。
int newWidth = oldHeight;
int newHeight = oldWidth;
Bitmap newBitmap =Bitmap.createScaledBitmap(oldbitmap,newWidth,newHeight,true);
現在你已經完成了 newBitmap 的真實面貌,沒有拉伸。
根據您的代碼,只需使用以下命令恢復位圖寬度和高度:
bitmap = resizeAndRotate(bitmap, bitmap.height, bitmap.width);
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