public static Rectangle ToRectangle(this Common.Rectangle rectangle)
=> new Rectangle
{
Height = rectangle.Height,
Width = rectangle.Width,
Left = rectangle.Left,
Top = rectangle.Top
};
private FaceAPI.Contract.Face CreateFace(Common.Rectangle rect)
{
return(new FaceAPI.Contract.Face
{
FaceRectangle = new FaceAPI.Contract.FaceRectangle
{
Left = rect.Left,
Top = rect.Top,
Width = rect.Width,
Height = rect.Height
}
});
}
private Face CreateFace(Microsoft.ProjectOxford.Common.Rectangle rect)
{
return(new Face
{
FaceRectangle = new FaceRectangle
{
Left = rect.Left,
Top = rect.Top,
Width = rect.Width,
Height = rect.Height
}
});
}
async private static Task CropBitmapAsync(Stream localFileStream, Microsoft.ProjectOxford.Common.Rectangle rectangle, StorageFile resultFile)
{
var pixels = await GetCroppedPixelsAsync(localFileStream.AsRandomAccessStream(), rectangle);
using (Stream resultStream = await resultFile.OpenStreamForWriteAsync())
{
IRandomAccessStream randomAccessStream = resultStream.AsRandomAccessStream();
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, randomAccessStream);
encoder.SetPixelData(BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Ignore,
(uint)rectangle.Width, (uint)rectangle.Height,
DisplayInformation.GetForCurrentView().LogicalDpi, DisplayInformation.GetForCurrentView().LogicalDpi, pixels);
await encoder.FlushAsync();
}
}
private Windows.UI.Xaml.Shapes.Rectangle ConvertPreviewToUiRectangle(Microsoft.ProjectOxford.Common.Rectangle faceRectangle)
{
var result = new Windows.UI.Xaml.Shapes.Rectangle();
var previewStream = _previewProperties as VideoEncodingProperties;
// If there is no available information about the preview, return an empty rectangle, as re-scaling to the screen coordinates will be impossible
if (previewStream == null)
{
return(result);
}
// Similarly, if any of the dimensions is zero (which would only happen in an error case) return an empty rectangle
if (previewStream.Width == 0 || previewStream.Height == 0)
{
return(result);
}
double streamWidth = previewStream.Width;
double streamHeight = previewStream.Height;
// For portrait orientations, the width and height need to be swapped
if (_displayOrientation == DisplayOrientations.Portrait || _displayOrientation == DisplayOrientations.PortraitFlipped)
{
streamHeight = previewStream.Width;
streamWidth = previewStream.Height;
}
// Get the rectangle that is occupied by the actual video feed
var previewInUI = GetPreviewStreamRectInControl(previewStream, PreviewControl);
// Scale the width and height from preview stream coordinates to window coordinates
result.Width = (faceRectangle.Width / streamWidth) * previewInUI.Width;
result.Height = (faceRectangle.Height / streamHeight) * previewInUI.Height;
// Scale the X and Y coordinates from preview stream coordinates to window coordinates
var x = (faceRectangle.Left / streamWidth) * previewInUI.Width;
var y = (faceRectangle.Top / streamHeight) * previewInUI.Height;
Canvas.SetLeft(result, x);
Canvas.SetTop(result, y);
return(result);
}
async public static Task <ImageSource> GetCroppedBitmapAsync(Func <Task <Stream> > originalImgFile, Microsoft.ProjectOxford.Common.Rectangle rectangle)
{
try
{
using (IRandomAccessStream stream = (await originalImgFile()).AsRandomAccessStream())
{
return(await GetCroppedBitmapAsync(stream, rectangle));
}
}
catch
{
// default to no image if we fail to crop the bitmap
return(null);
}
}
async public static Task <ImageSource> GetCroppedBitmapAsync(IRandomAccessStream stream, Microsoft.ProjectOxford.Common.Rectangle rectangle)
{
var pixels = await GetCroppedPixelsAsync(stream, rectangle);
// Stream the bytes into a WriteableBitmap
WriteableBitmap cropBmp = new WriteableBitmap(rectangle.Width, rectangle.Height);
cropBmp.FromByteArray(pixels);
return(cropBmp);
}
/// <summary>
/// Recognize emotions on faces in an image.
/// </summary>
/// <param name="imageStream">Stream of the image</param>
/// <returns>Async task, which, upon completion, will return rectangle and emotion scores for each face.</returns>
public async Task<Contract.Emotion[]> RecognizeAsync(Stream imageStream, Rectangle[] faceRectangles)
{
return await PostAsync<Stream, Contract.Emotion[]>(GetRecognizeUrl(faceRectangles), imageStream);
}
/// <summary>
/// Recognize emotions on faces in an image.
/// </summary>
/// <param name="imageUrl">URL of the image.</param>
/// <param name="faceRectangles">Array of face rectangles.</param>
/// <returns>Async task, which, upon completion, will return rectangle and emotion scores for each recognized face.</returns>
public async Task<Contract.Emotion[]> RecognizeAsync(String imageUrl, Rectangle[] faceRectangles)
{
return await PostAsync<UrlReqeust, Contract.Emotion[]>(GetRecognizeUrl(faceRectangles), new UrlReqeust { url = imageUrl });
}
private string GetRecognizeUrl(Rectangle[] faceRectangles)
{
var builder = new StringBuilder("/recognize");
if (faceRectangles != null && faceRectangles.Length > 0)
{
builder.Append("?faceRectangles=");
builder.Append(string.Join(";", faceRectangles.Select(r => String.Format("{0},{1},{2},{3}", r.Left, r.Top, r.Width, r.Height))));
}
return builder.ToString();
}
async public static Task CropBitmapAsync(Func <Task <Stream> > localFile, Microsoft.ProjectOxford.Common.Rectangle rectangle, StorageFile resultFile)
{
await CropBitmapAsync(await localFile(), rectangle, resultFile);
}
public static bool AreFacesPotentiallyTheSame(Microsoft.ProjectOxford.Common.Rectangle face1, FaceRectangle face2)
{
return(AreFacesPotentiallyTheSame((int)face1.Left, (int)face1.Top, (int)face1.Width, (int)face1.Height, face2.Left, face2.Top, face2.Width, face2.Height));
}
private void drawEmotionRectangle(Canvas RectangleCanvas, Rectangle FaceRectangle, float score, string emotion)
{
double ratio = 1;
double leftMargin = 0;
double topMargin = 0;
if (captureWidth > 0)
{
var hratio = RectangleCanvas.ActualHeight / captureHeight;
var wratio = RectangleCanvas.ActualWidth / captureWidth;
if (hratio < wratio)
{
ratio = hratio;
leftMargin = (RectangleCanvas.ActualWidth - (captureWidth * ratio)) / 2;
}
else
{
ratio = wratio;
topMargin = (RectangleCanvas.ActualHeight - (captureHeight * ratio)) / 2;
}
}
RectangleCanvas.Children.Clear();
var r = new Windows.UI.Xaml.Shapes.Rectangle();
RectangleCanvas.Children.Add(r);
r.Stroke = new SolidColorBrush(Windows.UI.Colors.Yellow);
r.StrokeThickness = 5;
r.Width = FaceRectangle.Width * ratio;
r.Height = FaceRectangle.Height * ratio;
Canvas.SetLeft(r, (FaceRectangle.Left * ratio) + leftMargin);
Canvas.SetTop(r, (FaceRectangle.Top * ratio) + topMargin);
Border b = new Border();
b.Background= new SolidColorBrush(Windows.UI.Colors.Yellow);
b.Width = r.Width;
RectangleCanvas.Children.Add(b);
b.Padding = new Thickness(2);
var t = new TextBlock();
b.Child=t;
t.Width = r.Width;
t.FontSize = 16;
t.Foreground = new SolidColorBrush(Windows.UI.Colors.Black);
Canvas.SetLeft(b, (FaceRectangle.Left * ratio) + leftMargin);
Canvas.SetTop(b, (FaceRectangle.Top * ratio) + topMargin + r.Height -1);
t.Text = $"{emotion}\r\n{score:N1}%";
}