Representation Learning for Compressed Video Action Recognition via Attentive Cross-modal Interaction with Motion Enhancement

TL;DR

This paper introduces MEACI-Net, a novel framework for compressed video action recognition that enhances cross-modal interaction between RGB and motion data using attentive modules and motion enhancement, leading to improved accuracy and efficiency.

Contribution

It proposes a new two-stream network with motion enhancement and attentive cross-modal modules, addressing noise and fusion issues in compressed video action recognition.

Findings

Achieves state-of-the-art results on UCF-101, HMDB-51, and Kinetics-400 datasets.

Demonstrates improved accuracy and efficiency over existing methods.

Effectively enhances motion representation and modality fusion.

Abstract

Compressed video action recognition has recently drawn growing attention, since it remarkably reduces the storage and computational cost via replacing raw videos by sparsely sampled RGB frames and compressed motion cues (e.g., motion vectors and residuals). However, this task severely suffers from the coarse and noisy dynamics and the insufficient fusion of the heterogeneous RGB and motion modalities. To address the two issues above, this paper proposes a novel framework, namely Attentive Cross-modal Interaction Network with Motion Enhancement (MEACI-Net). It follows the two-stream architecture, i.e. one for the RGB modality and the other for the motion modality. Particularly, the motion stream employs a multi-scale block embedded with a denoising module to enhance representation learning. The interaction between the two streams is then strengthened by introducing the Selective Motion Complement (SMC) and Cross-Modality Augment (CMA) modules, where SMC complements the RGB modality with spatio-temporally attentive local motion features and CMA further combines the two modalities with selective feature augmentation. Extensive experiments on the UCF-101, HMDB-51 and Kinetics-400 benchmarks demonstrate the effectiveness and efficiency of MEACI-Net.