Laura Sesma-Sanchez

Universidad de Pamplona, Памплона, Norte de Santander, Colombia

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Publications (4)5.33 Total impact

  • Laura Sesma-Sanchez, Arantxa Villanueva, Rafael Cabeza
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    ABSTRACT: One of the goals of the eye tracking community is to build systems that allow users to move freely. In general, there is a trade-off between the field of view of an eye tracking system and the gaze estimation accuracy. We aim to study how much the field of view of an eye tracking system can be increased, while maintaining acceptable accuracy. In this paper, we investigate all the issues concerning remote eye tracking systems with large range of movement in a simulated environment and we give some guidelines that can facilitate the process of designing an eye tracker. Given a desired range of movement and a working distance, we can calculate the camera focal length and sensor size or given a certain camera, we can determine the user's range of movement. The robustness against large head movement of two gaze estimation methods based on infrared light is analyzed: an interpolation and a geometrical method. We relate the accuracy of the gaze estimation methods with the image resolution around the eye area for a certain feature detector's accuracy and provide possible combinations of pixel size and focal length for different gaze estimation accuracies. Finally, we give the gaze estimation accuracy as a function of a new defined eye error, which is independent of any design parameters.
    Proceedings of the Symposium on Eye Tracking Research and Applications; 03/2014
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    ABSTRACT: A multistage procedure to detect eye features is presented. Multiresolution and topographic classification are used to detect the iris center. The eye corner is calculated combining valley detection and eyelid curve extraction. The algorithm is tested in the BioID database and in a proprietary database containing more than 1200 images. The results show that the suggested algorithm is robust and accurate. Regarding the iris center our method obtains the best average behavior for the BioID database compared to other available algorithms. Additional contributions are that our algorithm functions in real time and does not require complex post processing stages.
    ACM Transactions on Multimedia Computing Communications and Applications 08/2013; 9(4). · 0.90 Impact Factor
  • Source
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    ABSTRACT: The number of references per paper, perhaps the best single index of a journal's scholarliness, has been studied in different disciplines and periods. In this paper we present a four decade study of eight engineering journals. A data set of over 70000 references was generated after automatic data gathering and manual inspection for errors. Results show a significant increase in the number of references per paper, the average rises from 8 in 1972 to 25 in 2013. This growth presents an acceleration around the year 2000, consistent with a much easier access to search engines and documents produced by the generalization of the Internet.
    Scientometrics 06/2013; · 2.27 Impact Factor
  • L Sesma-Sanchez, A Villanueva, R Cabeza
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    ABSTRACT: Video oculography (VOG) is one of the most commonly used techniques for gaze tracking because it enables nonintrusive eye detection and tracking. Improving the eye tracking's accuracy and tolerance to user head movements is a common task in the field of gaze tracking; thus, a thorough study of how binocular information can improve a gaze tracking system's accuracy and tolerance to user head movements has been carried out. The analysis is focused on interpolation-based methods and systems with one and two infrared lights. New mapping features are proposed based on the commonly used pupil-glint vector using different distances as the normalization factor. For this study, an experimental procedure with six users based on a real VOG gaze tracking system was performed, and the results were contrasted with an eye simulator. Important conclusions have been obtained in terms of configuration, equation, and mapping features, such as the outperformance of the interglint distance as the normalization factor. Furthermore, the binocular gaze tracking system was found to have a similar or improved level of accuracy compared to that of the monocular gaze tracking system.
    IEEE transactions on bio-medical engineering 05/2012; 59(8):2235-43. · 2.15 Impact Factor