Access image header information on roslibjs side

edit

Hi all,

I can access an image of type opencv format and send it to a web browser using roslibjs library.

What I am not sure in is how to access the header information eg. header.stamp and header.frame_id on the roslibjs side of things. Any help would be greatly appreciated?

this is the c++ side of things

  cv_bridge::CvImagePtr cv_ptr(new cv_bridge::CvImage);
  ros::Time time = ros::Time::now();
  cv_ptr->encoding = "bgr8";
  cv_ptr->header.stamp = time;
  cv_ptr->header.frame_id = "/camera/image123";  
  cv_ptr->image = img;    
  image_pub_.publish(cv_ptr->toImageMsg());

on the js side of things

var image_listener = new ROSLIB.Topic({
      ros : ros,      
      name : '/camera/image/compressed',
      messageType : 'sensor_msgs/CompressedImage'
    });

    image_listener.subscribe(function(message) {      
      console.log("image listener event fired");      
      var imagedata = "data:image/jpeg;base64," + message.data;      
      document.getElementById("liveimage").src = imagedata;                             
    });