vuforia camera picture

using UnityEngine;
using System.Collections;
public class CameraImageAccess : MonoBehaviour, ITrackerEventHandler
{
    public QCARBehaviour qcarBehaviour;
    private Image.PIXEL_FORMAT m_PixelFormat = Image.PIXEL_FORMAT.RGB888;
    private bool m_RegisteredFormat = false;
    private bool m_LogInfo = true;

    private bool takePictureNextTrackablesUpdated = false;

    public void OnInitialized()
    {
        Debug.Log(" OnInitialized CameraImageAccess " + Time.realtimeSinceStartup);
    }

    void Start()
    {
        if (qcarBehaviour)
        {
            qcarBehaviour.RegisterTrackerEventHandler(this);
        }
    }

    public void SavePictureNextUpdate()
    {
        takePictureNextTrackablesUpdated = true;
    }

    public void OnTrackablesUpdated()
    {
        if (takePictureNextTrackablesUpdated == true)
        {
            GetFrame();
            takePictureNextTrackablesUpdated = false;
        }
    }

    private void GetFrame()
    {
        if (!m_RegisteredFormat)
        {
            bool formatOK = CameraDevice.Instance.SetFrameFormat(m_PixelFormat, true);
            if (formatOK)
            {
                m_RegisteredFormat = true;
            }
            else
            {
                Debug.Log("Format NOT OK, failed to set " + m_PixelFormat);
                return;
            }
        }

        CameraDevice cam = CameraDevice.Instance;
        Image image = cam.GetCameraImage(m_PixelFormat);
        StartCoroutine(ImageSaver(image));

    }

    IEnumerator ImageSaver(Image image)
    {
        while (image == null)
        {
            yield return new WaitForSeconds(0.03f);
            Debug.Log(m_PixelFormat + " image is not available yet ");
        }

        string s = m_PixelFormat + " image: \n";
        s += "  size: " + image.Width + "x" + image.Height + "\n";
        s += "  bufferSize: " + image.BufferWidth + "x" + image.BufferHeight + "\n";
        s += "  stride: " + image.Stride;
        Debug.Log(s);

    }
}