Windows 8 应用程序中的 CameraCaptureUI 拍摄镜像照片

Question

我在我的 windows 8 应用程序中编写了拍照服务。我使用了 CameraCaptureUI API。它有效，但结果是，拍摄的图像是镜像的：左边在右边，反之亦然。我在 CameraCapture 的 PhotoSettings 中搜索，并在互联网上搜索，但没有。

我在想也许解决方案是旋转我从相机流中保存的位图图像。这是我到目前为止尝试过的方法，但没有用：/

    public async Task<IPhoto> TakePhotoAsync(string filename)
    {   

        var dialog = new CameraCaptureUI();          
        dialog.PhotoSettings.CroppedAspectRatio = new Size(4, 3);
        dialog.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Png;
        StorageFile file = await dialog.CaptureFileAsync( CameraCaptureUIMode.Photo );
        if (file != null)
        {

            var stream = await file.OpenAsync(FileAccessMode.Read);
            //create decoder and encoder
            BitmapDecoder dec = await BitmapDecoder.CreateAsync(stream);
            BitmapEncoder enc = await BitmapEncoder.CreateForTranscodingAsync(stream, dec);
            enc.BitmapTransform.Rotation = BitmapRotation.Clockwise180Degrees;
            await enc.FlushAsync();
            var bitmap = new BitmapImage();
            bitmap.SetSource(stream);
            return new WPhotos(file);
        }
        return null;                   
    }

提前感谢您的宝贵时间和帮助:)

Answer 1

如果你想翻转你从流中保存的图像，试试这个：

How to Verticaly Flip an BitmapImage

基本上你应该使用 ScaleTransform 而不是 Rotation。

Answer 2

将 CameraCaptureUI 拍摄的照片的方向标准化的另一种解决方案是将其解码为 SoftwareBitmap，然后重新编码：

var captureUI = new CameraCaptureUI();
captureUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
captureUI.PhotoSettings.MaxResolution = CameraCaptureUIMaxPhotoResolution.SmallVga;

var photo = await captureUI.CaptureFileAsync(CameraCaptureUIMode.Photo);

if (photo == null) { return false; }

var photoprops = await photo.Properties.GetImagePropertiesAsync();

if (photoprops.Orientation != PhotoOrientation.Normal)
{
    using (var readStream = await photo.OpenAsync(FileAccessMode.Read))
    {
        var decoder = await BitmapDecoder.CreateAsync(readStream);

        using (var sb = await decoder.GetSoftwareBitmapAsync())
        using (var memStream = new Windows.Storage.Streams.InMemoryRandomAccessStream())
        {
            BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, memStream);
            encoder.SetSoftwareBitmap(sb);
            encoder.IsThumbnailGenerated = false;
            await encoder.FlushAsync();

            // photo data with normalised orientation available in memStream
        }
    }
}

Windows 8 应用程序中的 CameraCaptureUI 拍摄镜像照片

CameraCaptureUI in Windows 8 application takes a mirrored photo

c#

bitmapimage

windows-store-apps