A Multimedia IR-based System for the Photo Annotation Task at ImageCLEF2013

The UNED-UV group at the ImageCLEF2013 Campaign have participated in the Scalable Concept Image Annotation subtask. We present a multimedia IR-based system for the annotation task. In this collection, the images do not have any textual description associated, so we have downloaded and preprocessed the web pages which contain the images. Regarding the concepts, we expanded their textual description with additional information from external resources as Wikipedia or WordNet and we generate a KLD concept model using recovered textual information. The multimedia IR-based system uses a logistic relevance algorithm to get a model for each of the concepts to be trained using visual image features. Finally, the fusion subsystem merges textual and visual scores for a certain image to belong a concept, and decides the presence of the concept in the images.