iphone update uilabel and uiimageview

I have three labels and one uimageview object. The labels displays info about the image. My problem is that I can't update both the labels and image. The code below updates only labels. How to update uiimageview (ARView2) as well?

- (void)captureOutput:(AVCaptureOutput *)captureOutput 
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
       fromConnection:(AVCaptureConnection *)connection 
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    bufferContent = createIplImageFromSampleBuffer(sampleBuffer);   
    [self performSelectorOnMainThread:@selector(updateLabels) withObject:nil waitUntilDone:YES];

    [pool drain];
} 
-(void)updateLabels
{
    results = tracking(bufferContent);
    labelFPS.text =[NSString stringWithFormat:@"%.2f ms",results.resultTime];
    labelKeypoints.text = [NSString stringWithFormat:@" %d",results.noKeypoints];
    labelRecognised.text = [NSString stringWithFormat:@"%d",results.resultTime];
    [ARview2 setImage:[self UIImageFromIplImage:results.resultImg]];

}

When I use this code:

    - (void)captureOutput:(AVCaptureOutput *)captureOutput 
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
       fromConnection:(AVCaptureConnection *)connection 
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    bufferContent = createIplImageFrom开发者_开发知识库SampleBuffer(sampleBuffer); 
    results = tracking(bufferContent);
    labelFPS.text =[NSString stringWithFormat:@"%.2f ms",results.resultTime];
    labelKeypoints.text = [NSString stringWithFormat:@" %d",results.noKeypoints];
    labelRecognised.text = [NSString stringWithFormat:@"%d",results.resultTime];
    [ARView2 performSelectorOnMainThread:@selector(setImage:) withObject:[self UIImageFromIplImage:results.resultImg] waitUntilDone:YES];

    [pool drain];
} 

only ARView2 is updated with new image. But labels don't change their values.

FINAL ANSWEAR ok. Somehow I manage to achieve my goal. I don't know if it's correct but it works. I post the code, hope somebody will find it useful.

- (void)captureOutput:(AVCaptureOutput *)captureOutput 
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer 
       fromConnection:(AVCaptureConnection *)connection 
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    bufferContent = createIplImageFromSampleBuffer(sampleBuffer); 
    results = tracking(bufferContent);

    [arView performSelectorOnMainThread:@selector(setImage:) withObject:[self UIImageFromIplImage:results.resultImg] waitUntilDone:YES];
    [self performSelectorInBackground:@selector(updateLabels) withObject:nil];

    [pool drain];
} 
-(void)updateLabels
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    labelFPS.text =[NSString stringWithFormat:@"%.2f ms",results.resultTime];
    labelKeypoints.text = [NSString stringWithFormat:@" %d",results.noKeypoints];
    labelRecognised.text = [NSString stringWithFormat:@"%d",results.resultTime];
    [pool drain];
    pool = nil;

}

• Check if you connected properly ARview2 in UI;
• What is in results.resultImg? Is it a valid image?