include <stdio.h>

include <string.h>

include <math.h>

include <libfreenect.h>

include <pthread.h>

include "opencv2/imgproc/imgproc.hpp"

include "opencv2/highgui/highgui.hpp"

include <stdlib.h>

include <iostream>

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <libfreenect.h>
#include <pthread.h>
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <stdlib.h>
#include <iostream>

using namespace cv;
using namespace std;
 
std;

Mat img_depth;
Mat img_rgb;
Mat img_temp;
Mat img_canny;
Mat img_canny_temp;
 
img_canny_temp;

pthread_mutex_t mutex_depth = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex_rgb = PTHREAD_MUTEX_INITIALIZER;
pthread_t cv_thread;
 
cv_thread;

//callback for depthimage, called by libfreenect
void depthCallback(freenect_device *dev, void *depth, uint32_t timestamp)
{
    Mat depth8;
    Mat mydepth = Mat(Size(640, 480), CV_16UC1, depth);
 
depth);

    mydepth.convertTo(depth8, CV_8UC1, 1.0/4.0);
 pthread_mutex_lock(&mutex_depth);
 memcpy(img_depth.data, depth8.data, 640*480);

 //unlock mutex
 pthread_mutex_unlock(&mutex_depth);
 
}
 

}

//callback for rgbimage, called by libfreenect
void RGBCallback(freenect_device *dev, void *rgb, uint32_t timestamp)
{
    //lock mutex for opencv rgb image
    pthread_mutex_lock(&mutex_rgb);
 
pthread_mutex_lock(&mutex_rgb);

    memcpy(img_rgb.data, rgb, FREENECT_VIDEO_RGB_SIZE);

 //unlock mutex
 pthread_mutex_unlock(&mutex_rgb);
 
}
 
}

/*
 * thread for displaying the opencv content
 */
void *cv_threadfunc(void *ptr)
{
    img_depth = Mat(Size(640, 480), CV_8UC1);
    img_rgb = Mat(Size(640, 480), CV_8UC3);
    img_temp = Mat(Size(640, 480), CV_8UC3);
    img_canny = Mat(Size(640, 480), CV_8UC1);
    img_canny_temp = Mat(Size(640, 480), CV_8UC1);
 
CV_8UC1);

    //use image polling
 while(1)
 {
     //lock mutex for depth image
     pthread_mutex_lock(&mutex_depth);

     vector< vector<Point> > contours;

     Canny(img_depth, img_canny, 60, 110);

     findContours(img_canny, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);

     imshow("First",img_thresh);
     imshow("Canny", img_canny);

     //unlock mutex for depth image
     pthread_mutex_unlock(&mutex_depth);

     //lock mutex for rgb image
     pthread_mutex_lock(&mutex_rgb);

     //show image to window
     cvtColor(img_rgb,img_temp,CV_BGR2RGB);

     imshow("Second", img_temp);

     //unlock mutex
     pthread_mutex_unlock(&mutex_rgb);

     //wait for quit key
     if(cvWaitKey(15) == 27)
     {
         break;
     }
 }

 pthread_exit(NULL);

 return NULL;
 
}
 

}

int main(int argc, char **argv)
{
    freenect_context *f_ctx;
    freenect_device *f_dev;
 
*f_dev;

    int res = 0;
 int die = 0;

 printf("Kinect camera test\n");

 if(freenect_init(&f_ctx, NULL) < 0)
 {
     printf("freenect_init() failed\n");
     return 1;
 }

 if(freenect_open_device(f_ctx, &f_dev, 0) < 0)
 {
     printf("Could not open device\n");
     return 1;
 }

 freenect_set_depth_callback(f_dev, depthCallback);
 freenect_set_video_callback(f_dev, RGBCallback);
 freenect_set_video_format(f_dev, FREENECT_VIDEO_RGB);

 //create opencv display thread
 res = pthread_create(&cv_thread, NULL, cv_threadfunc, NULL);
 if(res)
 {
     printf("pthread_create failed\n");
     return 1;
 }

 printf("init done\n");

 freenect_start_depth(f_dev);
 freenect_start_video(f_dev);

 while(!die && freenect_process_events(f_ctx) >= 0);
}
 
} 
The error I'm getting is as follows:
 
/build/buildd/cairo-1.10.2/src/cairo-surface.c:1287: cairo_surface_set_device_offset: Assertion `status == CAIRO_STATUS_SUCCESS' failed. Aborted (core dumped)
 
I spent 5 hours on the internet searching for this, but still am clueless about this. Please help.