Publications

Publications related to the VIS Team

Automatic validation of ICAO compliance regarding head coverings

This paper contributes with a dataset and an algorithm that automatically veri es the compliance with the ICAO requirements related to the use of head coverings on facial images used on machine-readable travel documents. All the methods found in the literature ignore that some coverings might be accepted because of religious or cultural reasons, and basically only look for the presence of hats/caps. Our approach speci cally includes the religious cases and distinguishes the head coverings that might be considered compliant. We built a dataset composed by facial images of 500 identities to accommodate these type of accessories. That data was used to ne-tune and train a classi cation model based on the YOLOv8 framework and we achieved state of the art results with an accuracy of 99.1% and EER of 5.7%.

  • Author(s): Carla Guerra, João Marcos, Nuno Gonçalves
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  • Featured In: BIOSIG 2023 – 22nd international conference of the biometrics special interest group
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  • Publication Type: Thesis
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  • Year: 2023
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Uniquemark: A computer vision system for hallmarks authentication

Uniquemark is a vision system for authentication based on random marks, particularly hallmarks. Hallmarks are worldwide used to authenticate and attest the legal fineness of precious metal artefacts. Our authentication method is based on a multiclass classifier model that uses mark descriptor composed by several geometric features of the particles.

  • Author(s): Ricardo Barata, Leandro Cruz, Bruno Patrão, Nuno Gonçalves
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  • Featured In: Recpad 2018-24th Portuguese Conference on Pattern Recognition
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  • Publication Type: Thesis
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  • Year: 2018
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