1. A medical image data processing system for automatically identifying a catheterization device including marker objects for use in identifying the catheterization device in a medical image for Angiography or another medical procedure, comprising: an image data processor for, automatically identifying non-marker objects in a medical image by comparing image data representing individual non-marker objects with image data representing a template non-marker object, automatically identifying catheterization device marker objects by comparing image data representing individual candidate marker objects with image data representing a template marker object and processing image representative data to provide processed image data excluding image data representing non-marker objects; and a user interface for generating data representing a display image indicating identified marker objects and an associated catheterization device using said processed image data for presentation to a user.