I have superview to display the ImageView in EAGLview while target detect. It displays the image, then i have a button to hide the image from superview. After hiding imageView i can't display again, So, it won't displaying second time scan the target.

if(!strcmp(trackable.getName(), "Stones")){

              dispatch_async(dispatch_get_main_queue(), ^(void) {

                if (!annotation1.superview) {

                    [self addSubview:annotation1];

                       imgView_depress = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 600, 500)];

                     imgView_depress.image = [UIImage imageNamed:@"brain.jpg"];

                               [annotation1 addSubview: imgView_depress];

}

-(void)closeButtonTapped:(id)sender{

     [closeButton setHidden:YES];

     [imgView_depress setHidden:YES];

 }

After closing the button the imageView goes off (hiding), but again scan the imageTarget the imageView not displaying