Abstract
Using the voice to interact with systems is attractive in medicine and other areas due to its friendliness and flexibility. Video indexing and retrieval have benefited from this resource. However, few initiatives use speech recognition to support both tasks. This work aims to develop and evaluate a prototype system to index and retrieve videos from speech transcription. In particular, the user can narrate each video’s content, generating the utterance that is captured, transformed into text and timestamped by the computational system. Simple text processing techniques are then applied to the obtained transcript before indexing. Afterward, the user can also query by speech or text to find relevant videos previously indexed. We conducted an experimental evaluation of the prototype in sets of 50 and 10 public videos. As part of this process, one collaborator manually narrated the 50 videos, while four others narrated a subset of 13 videos. An automatic narration scheme was also applied to this subset and the set of 10 videos. The evaluation showed promising results regarding Brazilian Portuguese speech recognition and retrieval performance. For example, the average word error rate reached down to 0.03 and the mean average precision achieved up to 1.00. Besides performing well, the computational tool is flexible since few changes are required to support other languages.
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Data availability
The videos used by us are publicly available in Portuguese in the links reported in Sect. 3.3. More information on the data or the prototype’s configuration files is available under request to the authors.
Code availability
Currently, the code is not available.
Notes
References
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Funding
We would like to thank Araucária Foundation for the Support of the Scientific and Technological Development of Paraná through a Research and Technological Productivity Scholarship for H. D. Lee (grant 028/2019). We also would like to thank PGEEC/UNIOESTE through a postdoctoral scholarship for N. Spolaôr, the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 through a MSc. scholarship for L. A. Ensina and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) through the grant number 142050/2019-9 for A. R. S. Parmezan. These agencies did not have any further involvement in this paper.
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Appendix
Appendix
1.1 Calibration text in Brazilian Portuguese
Tudo indica que a Reforma da Previdência será o tema de destaque. A proposta deve começar a ser discutida no plenário na quinta-feira, mas a expectativa de votação é só pra semana que vem. Está na pauta do plenário ainda uma proposta que parcela dívidas dos produtores rurais com a previdência, que substitui uma medida provisória que perdeu a validade. O texto base foi aprovado.
1.2 Queries used for video retrieval
1.3 Speech recognition results
1.4 Video retrieval results
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Spolaôr, N., Lee, H.D., Takaki, W.S.R. et al. A video indexing and retrieval computational prototype based on transcribed speech. Multimed Tools Appl 80, 33971–34017 (2021). https://doi.org/10.1007/s11042-021-11401-1
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DOI: https://doi.org/10.1007/s11042-021-11401-1