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View Adaptive Recurrent Neural Networks for High Performance Human Action Recognition from Skeleton Data (1703.08274v2)

Published 24 Mar 2017 in cs.CV

Abstract: Skeleton-based human action recognition has recently attracted increasing attention due to the popularity of 3D skeleton data. One main challenge lies in the large view variations in captured human actions. We propose a novel view adaptation scheme to automatically regulate observation viewpoints during the occurrence of an action. Rather than re-positioning the skeletons based on a human defined prior criterion, we design a view adaptive recurrent neural network (RNN) with LSTM architecture, which enables the network itself to adapt to the most suitable observation viewpoints from end to end. Extensive experiment analyses show that the proposed view adaptive RNN model strives to (1) transform the skeletons of various views to much more consistent viewpoints and (2) maintain the continuity of the action rather than transforming every frame to the same position with the same body orientation. Our model achieves significant improvement over the state-of-the-art approaches on three benchmark datasets.

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Authors (6)
  1. Pengfei Zhang (261 papers)
  2. Cuiling Lan (60 papers)
  3. Junliang Xing (80 papers)
  4. Wenjun Zeng (130 papers)
  5. Jianru Xue (35 papers)
  6. Nanning Zheng (146 papers)
Citations (551)

Summary

  • The paper introduces a view adaptive RNN that dynamically optimizes skeleton data transformations for human action recognition.
  • It deploys a dual-network architecture combining a view adaptation subnetwork with a main LSTM to enhance temporal feature extraction.
  • Empirical results demonstrate a 6% accuracy improvement on the NTU dataset, validating the model's robust performance.

View Adaptive Recurrent Neural Networks for High Performance Human Action Recognition from Skeleton Data

The paper, titled "View Adaptive Recurrent Neural Networks for High Performance Human Action Recognition from Skeleton Data," addresses the complexities associated with human action recognition in computer vision, specifically when using 3D skeleton data. This research focuses on overcoming the challenges posed by varying observation viewpoints, a common issue in real-world action recognition applications.

Overview

Human action recognition is an essential area in computer vision, with applications spanning surveillance, human-computer interaction, and video analytics. Traditional methods often rely on color video data, but 3D skeleton data provides a high-level representation resilient to changes in viewpoint and background noise. These advantages make skeleton data a focus of recent research efforts. This paper contributes to the field by proposing a novel view adaptation scheme within recurrent neural networks (RNNs).

Methodology

The core of this research is the development of a view adaptive RNN using Long Short-Term Memory (LSTM) architecture. Unlike prior methods that preprocess skeleton data using fixed human-defined transformations, this approach allows the network to dynamically determine the most advantageous observation viewpoints for action recognition. This is achieved by incorporating a View Adaptation Subnetwork alongside a Main LSTM Network.

  1. View Adaptation Subnetwork: This component automatically adjusts the observation viewpoint through translation and rotation of the skeleton data. It leverages LSTM layers to learn these transformations based on input skeleton joints, optimizing for improved recognition accuracy.
  2. Main LSTM Network: This component handles temporal dynamics and feature abstractions, utilizing the adjusted skeleton representations to classify actions.

Results

The proposed model demonstrates significant improvements over state-of-the-art techniques across three benchmark datasets: NTU RGB+D, SBU Kinect Interaction, and SYSU 3D Human-Object Interaction. Notably, it achieves an accuracy increase of approximately 6% on the NTU dataset compared to previous leading methods. This enhancement underscores the efficiency of the dynamic view adaptation strategy.

Implications

The implications of this research are manifold. Practically, this method improves the robustness of action recognition systems by enabling them to adapt to varying viewpoints in real-time, without extensive preprocessing. Theoretically, it highlights the potential of RNNs equipped with adaptive modules to learn optimal conditions for specific tasks.

Future Directions

Future work could explore extending this concept to larger datasets and more complex action sequences. Additionally, integrating this approach with other sensory data, such as RGB videos or LiDAR, may yield further improvements. As AI continues to evolve, developing models that adaptively optimize for varying conditions will be crucial to achieving real-world applicability.

In conclusion, this paper presents a significant advancement in skeleton-based human action recognition by introducing a novel view adaptive RNN framework, demonstrating notable improvements in performance across several benchmarks. This work sets a precedent for future research aiming to enhance action recognition systems' adaptability and accuracy.