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Auflistung nach Autor:in "Tapia, Juan"

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  • Konferenzbeitrag
    Image Quality Assessment on Identity Documents
    (BIOSIG 2021 - Proceedings of the 20th International Conference of the Biometrics Special Interest Group, 2021) Yáñez, Claudio; Tapia, Juan
    This paper developed a method for performing Image Quality Assessment (IQA) on ID-Card images. First, we build the dataset, consisting of 204 images from Chilean ID-Cards, containing real and tampered images with varying quality levels. Then, we evaluated different features, obtaining the best results using the BRISQUE features and a newly trained SVR, with an $R^2$ score of 0.5868. This proposed method is called BRISQUE-ID. The IQA on ID-Cards can be used as a pre-processing stage for discarding lousy quality images and helping the subsequent steps in the processing pipeline.
  • Konferenzbeitrag
    Toward to Reduction of Bias for Gender and Ethnicity from Face Images using Automated Skin Tone Classification
    (BIOSIG 2020 - Proceedings of the 19th International Conference of the Biometrics Special Interest Group, 2020) Molina, David; Causa, Leonardo; Tapia, Juan
    This paper proposes and analyzes a new approach for reducing the bias in gender caused by skin tone from faces based on transfer learning with fine-tuning. The categorization of the ethnicity was developed based on an objective method instead of a subjective Fitzpatrick scale. A Kmeans method was used to categorize the color faces using clusters of RGB pixel values. Also, a new database was collected from the internet and will be available upon request. Our method outperforms the state of the art and reduces the gender classification bias using the skin-type categorization. The best results were achieved with VGGNET architecture with 96.71% accuracy and 3.29% error rate.