Visual Speech Recognition (VSR) differs from the common perception tasks as it requires deeper reasoning over the video sequence, even by human experts. Despite the recent advances in VSR, current approaches rely on labeled data to fully train or finetune their models predicting the target speech. This hinders their ability to generalize well beyond the training set and leads to performance degeneration under out-of-distribution challenging scenarios. Unlike previous works that involve auxiliary losses or complex training procedures and architectures, we propose a simple approach, named Lip2Vec that is based on learning a prior model. Given a robust visual speech encoder, this network maps the encoded latent representations of the lip sequence to their corresponding latents from the audio pair, which are sufficiently invariant for effective text decoding. The generated audio representation is then decoded to text using an off-the-shelf Audio Speech Recognition (ASR) model. The proposed model compares favorably with fully-supervised learning methods on the LRS3 dataset achieving 26 WER. Unlike SoTA approaches, our model keeps a reasonable performance on the VoxCeleb test set. We believe that reprogramming the VSR as an ASR task narrows the performance gap between the two and paves the way for more flexible formulations of lip reading.

基于Lip2Vec的视觉语音识别（VSR）模型通过学习先验模型，将嘴唇序列的编码潜在表示映射到对应的音频潜在表示，以实现有效的文本解码。利用现成的音频语音识别（ASR）模型将生成的音频表示解码为文本，该方法在LRS3数据集上实现了26的错误率（WER），并在VoxCeleb测试集上保持了合理的性能，为更灵活的口型阅读形式拉近了口语识别与视觉语音识别之间的性能差距。

Lip2Vec: 通过隐藏到隐藏的视听表示映射实现高效稳健的视觉语音识别