Uma Proposta de Protocolo Técnico para Leitura Labial Forense
Technical Protocol Proposal for Forensic Lipreading
Keywords:
lip reading, speech, forensic phonetics, articulatory phonetics, visemes, language as evidence, technical evidence, forensic linguisticsAbstract
Lipreading is used as a technical tool in forensic contexts, especially in cases involving videos without audio or with compromised recordings. Despite its growing application, systematized protocols are still lacking to guide the analysis of silent speech using technical, linguistic, and forensic criteria. This article presents a technical-descriptive protocol for forensic lipreading, structured in five stages and grounded in documented practices. The analytical framework considers parameters such as image resolution, frame rate, camera angle, viseme visibility, geolinguistic variation, and pragmatic context. The discussion also addresses the limits of visual inference and the criteria for media admissibility, emphasizing the integrity and traceability of the analyzed material. Anchored in the forensic linguistics perspective that treats language as evidence, the proposal aims to establish lipreading as a legitimate and auditable practice. It provides a methodological foundation for professional training, practical use, and future empirical validation in applied forensic communication studies.
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Associação Brasileira de Normas Técnicas. (2022). NBR ISO/IEC 27002:2022 – Tecnologia da informação – Técnicas de segurança – Código de prática para a gestão da segurança da informação. Rio de Janeiro: ABNT.
Assael Y.M., Shillingford B., Whiteson S., e de Freitas N. (2016). LipNet: End-to-End Sentence-level Lipreading. arXiv:1611.01599.
Barbosa P.A., e Albano E.C. (2004). Brazilian Portuguese. Journal of the International Phonetic Association, 34(2), 227–232.
Bear H.L., e Harvey R. (2019). Alternative Visual Units for Visual Speech Recognition. Applied Sciences, 9(18), 3870.
Bernstein, L. E., Auer E.T., e Eberhardt S.P. (2022). Lipreading training with sentence stimuli. American Journal of Audiology, 31(1), 57–77.
Brendel O. (2023). Some aspects of visual-auditory perception of oral speech while video and sound recordings examination. Theory and Practice of Forensic Science and Criminalistics, 28, 13–22.
Broeders A.P.A. (2001). Forensic speech and audio analysis forensic linguistics 1998 to 2001: a review. Paper at the 13th INTERPOL Forensic Science Symposium.
Caldas-Coulthard C.R. (2014). ReVEL na escola: O que é a linguística forense? ReVEL, 12(23).
Caroll J. (2004). Questões institucionais para deter, detectar e lidar com o plágio estudantil. JISC online, http://www.jisc.ac.uk/publications/briengpapers/2005/pub_plagiarism.aspx, Acessado em 14 de novembro de 2021.
Cascone L., Battaglino C., e Galasso F. (2023). Language identification for lip-based biometric systems. arXiv:2302.13902.
CaseMine. (2004). R v Luttrell & Ors. Recuperado de https://www.casemine.com/judgement/uk/5a8ff7b460d03e7f57eb1590, Acessado em 14 de maio de 2025.
Dörnyei Z. (2007). Research methods in applied linguistics. Oxford: Oxford University Press.
Feng D., Yang S., Shan S., e Chen X. (2020). Learn an effective lip reading model without pains. arXiv:2011.07557.
Figueiredo R.M. (1994). Identificação de falantes: aspectos teóricos e metodológicos. Tese de Doutorado. Universidade Estadual de Campinas.
Gáscon Abellán M. (2010). Prueba científica: mitos y paradigmas. Anales de la Cátedra Francisco Suárez, 44. Recuperado de https://revistaseug.ugr.es/index.php/acfs/article/view/500/590, Acessado em 14 de maio de 2025.
Gimeno-Gómez D., e Martínez-Hinarejos C.D. (2023). Continuous Lip Reading in Spanish. arXiv:2311.12468.
Gloe T., Fischer A., e Kirchner M. (2014). Forensic analysis of video file formats. Digital Investigation, 11, S68–S76.
Grant T. (2010). Text messaging forensics: Txt 4n6 – Idiolect free authorship analysis? Em M. Coulthard, A. Johnson e D. Wright (eds), The Routledge Handbook of Forensic Linguistics. London; New York: Routledge, 517–533.
Home Office UK. (2009). CCTV Operational Requirements Manual.
IBM Corporation; Microsoft Corporation. (1991). Multimedia Programming Interface and Data Specifications 1.0.
International Organization for Standardization (ISO). (2012). ISO/IEC 14496-12:2012 – Coding of audiovisual objects – Part 12: ISO base media file format. Geneva: ISO.
Kaur M., Rastogi D., Sharma A., Mahajan P., Dahiya A., e Nagrath P. (2024). Crime Investigation Using Lip Reading. SCCTT.
Kim M., et al. (2023). Lip Reading for Low-resource Languages. Proceedings of the IEEE International Conference on Computer Vision (ICCV).
Labov W. (1966). The social stratification of English in New York City. Washington, DC: Center for Applied Linguistics.
Labov W. (1972). Sociolinguistic patterns. Philadelphia: University of Pennsylvania Press.
Macedo A.T., e Silva G.M.O. (1996). Análise sociolinguística de alguns marcadores conversacionais. Em A.T. Macedo, C.N. Roncarati e M.C. Mollica (eds), Variação e discurso. Rio de Janeiro: Tempo Brasileiro.
Migalhas. (2024). TJ-SC confirma júri após prova recuperada por leitura labial. Migalhas. Recuperado de https://www.migalhas.com.br/quentes/420959/tj-sc-confirma-juri-apos-prova-recuperada-por-leitura-labial, Acessado em 14 de maio de 2025.
Nolan F. (1983). The phonetic bases of speaker recognition. Cambridge: Cambridge University Press.
Nolan F., McDougall K., e Hudson T. (2013). Efeitos do telefone na semelhança de voz percebida: implicações para as escalações de voz. The International Journal of Speech, Language and the Law, 20(2), 229--246.
Northern Scot. (2014). Feature: A decade since final chapter of Arlene Fraser murder. The Northern Scot. Recuperado de https://www.northern-scot.co.uk/news/feature-decade-since-final-chapter-of-arlene-fraser-murder-329389/, Acessado em 14 de maio de 2025.
Oghbaie M., Sabaghi A., Hashemifard K., e Akbari M. (2021). Advances and Challenges in Deep Lip Reading. arXiv:2110.07879.
Pessoa A.F., et al. (2024). Admissibilidade de amostras forenses. Em L.P. Ferreira e S.C.O. Limongi (eds), Tratado de Fonoaudiologia. São Paulo: Manole.
Peymanfard J., Chatrzarrin H., e Reda H.T. (2023). Leveraging Visemes for Lip Reading. arXiv:2307.10157.
Rose P. (2002). Forensic speaker identification. London: Taylor & Francis.
Silva J.C.B. (2011). Contornos atuais e novas questões sobre a prova documental no processo civil brasileiro – o anteprojeto de código de processo civil. Revista Direito, 2011.
Silva Sousa R., e Coulthard M. (2016). Linguística forense. Em R.J. Dinis-Oliveira e T. Magalhães (eds), O que são as ciências forenses? – Conceitos, abrangência e perspetivas futuras. Lisboa: Pactor.
Thangthai K., Bear H.L., e Harvey R. (2018). Comparing phonemes and visemes for lipreading. arXiv:1805.02924.
Theobald B.J., Bangham J.A., Cox S., et al. (2006). Lip-reading enhancement for law enforcement applications. Proceedings of SPIE, 6402.
Turell M.T. (2010). The use of textual, grammatical and sociolinguistic evidence in forensic text comparison. The International Journal of Speech, Language and the Law, 17(2), 211–250.
Tye-Murray N., Sommers M.S., Spehar B., et al. (2022). Teaching children with hearing loss to recognize speech: a review of evidence-based approaches. Ear and Hearing, 43(1), 181–191.
Vieira R.C. (2017). Contribuições dos estudos sociofonéticos para a identificação de falantes. Revista Intercâmbio – Especial Expressividade, XXXVI, 86–102. São Paulo: LAEL/PUCSP.
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