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