A convolutional network video action recognition algorithm based on a three-dimensional attention mechanism

There are issues with capturing the actions of moving objects in video sequences with sufficient accuracy. Introducing a three-dimensional convolutional neural network (3D-CNN) can effectively capture dynamic information in video sequences. However, due to its fixed receptive field, it cannot capture long-range dependencies. To address these issues, this paper proposes an algorithm that combines a three-dimensional convolutional neural network and a 3D self-attention mechanism. This method primarily improves action recognition accuracy by capturing spatiotemporal information in video sequences. Firstly, 3D-CNN is utilized to perform convolution operations in width, height, and time dimensions, extracting spatiotemporal features from video frames. Secondly, the self-attention mechanism is extended to three dimensions by introducing a 3D self-attention mechanism to process spatiotemporal data. This mechanism calculates the relationship between each frame in the video sequence and all other frames, capturing long-range dependencies. Experimental results show that, compared to other algorithms, the recognition accuracy of the proposed algorithm increases by at least 7.2% and 5.4% on the UCF-101 and HMDB51 datasets, respectively. Additionally, the proposed algorithm has good interpretability, allowing for understanding of the model's decision-making process through visualizing attention weights.