private float GetBarcodeHeight(Quadrilateral predictedLocation)
{
var topLeft = picker.ConvertPoint(predictedLocation.topLeft);
var bottomLeft = picker.ConvertPoint(predictedLocation.bottomLeft);
var topRight = picker.ConvertPoint(predictedLocation.topRight);
var bottomRight = picker.ConvertPoint(predictedLocation.bottomRight);
return((float)Math.Max(bottomLeft.Y - topLeft.Y, bottomRight.Y - topRight.Y));
}