emg2face: Expressive Facial Animation with High-Density Surface EMG
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The paper presents emg2face, a system that uses high‑density surface electromyography (HD‑sEMG) to capture facial expressions without optical cameras, addressing issues of occlusion and privacy. It records 64 EMG channels with textile grids, synchronizes the data with video using analog audio bursts, and fits a high‑resolution parametric head model to 3D facial landmarks. A deep neural network then predicts blendshape parameters from the EMG signals, enabling real‑time facial animation on various characters.
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The paper introduces GALA, a distillation technique that replaces costly neural decoding in 3D Gaussian avatars with a shallow MLP predicting blendshape coefficients, enabling real‑time animation. By constructing a basis via block‑local PCA under a rendering‑aware metric, GALA achieves high fidelity while reducing memory usage. Experiments on three avatar models show up to three orders of magnitude lower CPU cost and frame rates up to 60fps on mobile devices.
The paper presents a method for emotion recognition in virtual reality where head‑mounted displays occlude the upper face. By fusing lower‑face video with electromyography (EMG) signals from the occluded upper face, the authors achieve a 51% macro‑F1 score across seven emotional categories, outperforming image‑only and EMG‑only baselines. A new synchronized multimodal dataset from 20 participants is introduced and will be shared under an ethical‑use agreement.
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