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A novel multimodal fusion approach is proposed for Chinese sign language (CSL) recognition. This framework, the LSTM2+CHMM model, uses dual long short-term memory (LSTM) and a couple hidden Markov model (CHMM) to fuse hand and skeleton sequence information. Novel contributions, first, include a unique hand segmentation algorithm using power rate transforms and the RGB-D image fusion. This approach effectively overcomes common limitations, such as complex backgrounds, inconsistent lighting, and variable skin tones. Then, as a result, the proposed skeleton-hand fusion framework can be used for the vision-based sign language recognition (SLR) of non-specific people in non-specific environments. Finally, this LSTM2+CHMM model combines the probability theory with a neural network to provide a unified methodology for multiple-sequence fusion. The proposed SLR framework was tested using the two CSL datasets, and the experimental results showed it to be effective.

Multimodal Fusion Based on LSTM and a Couple Conditional Hidden Markov Model for Chinese Sign Language Recognition