How to save rgb frame in speechRecognized event handler?

Question

I'm trying to develop a basic photograph capturing application in WPF with Kinect SDK. It looks easy to capture frames in Kinect_ColorFrameReady event handler but what I want to do is to capture frame when the user says "Capture" which is already defined in my Grammar.xml. And then I want to save it with an image extension like bmp,jpeg... What should I do in the commented line in the code below:

private void speechRecognized(object sender, SpeechRecognizedEventArgs e)
{
        recognizedWord = e.Result.Semantics.Value.ToString();

        if (recognizedWord == "Capture")
        {
            // Capture rgb frame?
        }
}

Answer 1

You can have the WriteableBitmap used to display the image stored as a global variable.

WriteableBitmap image;

... //write/display bitmap

private void speechRecognized(object sender, SpeechRecognizedEventArgs e)
{
    recognizedWord = e.Result.Semantics.Value.ToString();

    if (recognizedWord == "Capture")
    {
        using (FileStream stream5 = new FileStream(filename, FileMode.Create))
        {
            JpgBitmapEncoder encoder5 = new JpgBitmapEncoder();
            encoder5.Frames.Add(BitmapFrame.Create(image));
            encoder5.Save(stream5);
            stream5.Close();
        }
    }
}