// we like to find a document in a photo
Var request As New VNDetectDocumentSegmentationRequestMBS
Var requests() As VNRequestMBS = Array(request)

Var file As FolderItem = SpecialFolder.Desktop.Child("IMG_4302.jpeg")
Var imageRequestHandler As VNImageRequestHandlerMBS = VNImageRequestHandlerMBS.RequestWithFile(file)

// perform request synchronously. Asynchronously with callback is also possible
Var error As NSErrorMBS
Var r As Boolean = imageRequestHandler.performRequests(requests, error)

If r Then
  
  Var results() As VNObservationMBS = request.results
  Var result As VNObservationMBS = results(0)
  If result IsA VNRectangleObservationMBS Then
    Var hresult As VNRectangleObservationMBS = VNRectangleObservationMBS(result)
    Var boundingBox As CGRectMBS = hresult.boundingBox
    
    MessageBox _
      boundingBox.Origin.X.ToString+"/"+_
      boundingBox.Origin.Y.ToString+" "+_
      boundingBox.Size.Width.ToString+"x"+_
      boundingBox.Size.Height.ToString
    
  End If
End If