Face recognition emgu.cv.dll exception object reference not set to an instance of an object

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i want recognize faces using Emgu.CV library i selected the trained faces from the database and store them in image list as well as the labels

my problem is that when even i run the program it show me this error

An unhandled exception of type 'System.NullReferenceException' occurred in Emgu.CV.dll

Additional information: Object reference not set to an instance of an object.

please what is the cause of this problem and how can i solve if?

What I have tried:

i have tried this code

VB

Dim trainingImages() As Image(Of Gray, Byte) = New Image(Of Gray, Byte)((5) - 1) {}
        trainingImages(0) = New Image(Of Gray, Byte)(PictureBox1.Image)
        Dim labels() As String = New String() {"Brad"}

        Dim termCrit As New MCvTermCriteria(30, 0.001)
        recognizer = New EigenObjectRecognizer(trainingImages.ToArray, labels.ToArray, 1000, termCrit)
        Dim testImage As Image(Of Gray, Byte) = New Image(Of Gray, Byte)(imgFrame.Bitmap)
        Dim label As String = recognizer.Recognize(testImage).Label
        Console.Write(label)

i'll appreciate your response. thnx

Posted 26-Mar-16 22:42pm

Engr. S.M. Inuwa

Updated 26-Mar-16 23:19pm

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Patrice T · Answer 1 · 2016-03-26T23:19:00

You should learn to use the debugger as soon as possible. Rather than guessing what your code is doing, It is time to see your code executing and ensuring that it does what you expect.

The debugger allow you to follow the execution line by line, inspect variables and you will see that there is a point where it stop doing what you expect.
Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
http://docs.oracle.com/javase/7/docs/technotes/tools/windows/jdb.html[^]
https://www.jetbrains.com/idea/help/debugging-your-first-java-application.html[^]

Quote:
Face recognition emgu.cv.dll exception object reference not set to an instance of an object

Either a variable is not initialized or a fail made that a variable received NULL instead of the expected object.
The debugger will help you to to find where is the fail.