async Task UpdateImageSource()
{
CleanImageSource();
_softwareBitmap = _bitmap.ToSoftwareBitmap();
_sbs = new SoftwareBitmapSource();
await _sbs.SetBitmapAsync(_softwareBitmap);
image.Source = _sbs;
imageGrid.Width = _bitmap.PixelWidth;
imageGrid.Height = _bitmap.PixelHeight;
InitSelection();
}