Silent speech recognition using visual cascading fusion of tongue-lip movements based on pre-trained and fine-tuned model

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Tongue-lip movement visual information exhibits superior performance in the task of silent speech recognition (SSR) and is increasingly focused on by researchers. Traditionally, in the field of SSR using tongue-lip visual information, data augmentation and feature fusion have received the most attention. Different from traditional approaches, we proposed to fuse the tongue-lip visual information by a cascading fusion algorithm to achieve “visual co-occurrence” of the tongue and lip frame by frame. Besides, the pre-trained and fine-tuned frameworks based on Visual-HuBERT using masked technology are used to address the overfitting problems of model due to a lack of training data. The proposed model is evaluated based on the TaL and self-made Chinese data corpus. Experimental results show that the average word error rate (WER) of proposed model can achieve to 23.34%, representing a 1.75% reduction compared to the baseline model. In addition, the average WER of proposed model based on self-made Chinese data corpus can achieve 50.23%, and the average tone error rate can achieve to 47.04%. The above results illustrate that our proposed model not only performs better than the baseline model, but also handles tonal language in SSR, such as Mandarin.