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Zero-shot keyword spotting for visual speech recognition in-the-wild

Tzimiropoulos, Yorgos; Stafylakis, Themos


Yorgos Tzimiropoulos

Themos Stafylakis


Visual keyword spotting (KWS) is the problem of estimating whether a text query occurs in a given recording using only video information. This paper focuses on visual KWS for words unseen during training, a real-world, practical setting which so far has received no attention by the community. To this end, we devise an end-to-end architecture comprising (a) a state-of-the-art visual feature extractor based on spatiotemporal Residual Networks, (b) a grapheme-to-phoneme model based on sequence-to-sequence neural networks, and (c) a stack of recurrent neural networks which learn how to correlate visual features with the keyword representation. Different to prior works on KWS, which try to learn word representations merely from sequences of graphemes (i.e. letters), we propose the use of a grapheme-to-phoneme encoder-decoder model which learns how to map words to their pronunciation. We demonstrate that our system obtains very promising visual-only KWS results on the challenging LRS2 database, for keywords unseen during training. We also show that our system outperforms a baseline which addresses KWS via automatic speech recognition (ASR), while it drastically improves over other recently proposed ASR-free KWS methods.


Tzimiropoulos, Y., & Stafylakis, T. (2018). Zero-shot keyword spotting for visual speech recognition in-the-wild. In Computer Vision – ECCV 2018, 536-552. doi:10.1007/978-3-030-01225-0_32

Conference Name European Conference on Computer Vision
Start Date Sep 8, 2018
End Date Sep 14, 2018
Acceptance Date Jul 3, 2018
Online Publication Date Oct 6, 2018
Publication Date Oct 6, 2018
Deposit Date Oct 15, 2018
Publicly Available Date Oct 7, 2019
Publisher Springer Nature
Pages 536-552
Series Title Lecture notes in computer science
Series Number 11208
Book Title Computer Vision – ECCV 2018
Chapter Number N/A
ISBN 978-3-030-01224-3
Keywords Visual keyword spotting; Visual speech recognition; Zero-shot learning
Public URL
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