Consistent 3d hand reconstruction in video via self-supervised learning
Abstract: We present a method for reconstructing accurate and consistent 3D hands from a monocular video. We observe that the detected 2D hand keypoints and the image texture provide important cues about the geometry and texture of the 3D hand, which can reduce or even eliminate the requirement on 3D hand annotation. Accordingly, in this work, we propose **S\(^2\)HAND**, a self-supervised 3D hand reconstruction model that can jointly estimate pose, shape, texture, and the camera viewpoint from a single RGB input through the supervision of easily accessible 2D detected keypoints. We leverage the continuous hand motion information contained in the unlabeled video data and explore **S\(^2\)HAND(V)**, which uses a set of weights shared across **S\(^2\)HAND** to process each frame and exploits additional motion, texture, and shape consistency constraints to obtain more accurate hand poses, and more consistent shapes and textures. Experiments on benchmark datasets demonstrate that our self-supervised method produces comparable hand reconstruction performance compared with recent fully supervised methods in single-frame input setups, and notably improves the reconstruction accuracy and consistency when using the video training data.
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