Convolutional neural networks (CNNs) have been extensively applied for image
recognition problems giving state-of-the-art results on recognition, detection,
segmentation and retrieval. In this work we propose and evaluate several deep
neural network architectures to combine image information across a video over
longer time periods than previously attempted. We propose two methods capable
of handling full length videos. The first method explores various convolutional
temporal feature pooling architectures, examining the various design choices
which need to be made when adapting a CNN for this task. The second proposed
method explicitly models the video as an ordered sequence of frames. For this
purpose we employ a recurrent neural network that uses Long Short-Term Memory
(LSTM) cells which are connected to the output of the underlying CNN. Our best
networks exhibit significant performance improvements over previously published
results on the Sports 1 million dataset (73.1% vs. 60.9%) and the UCF-101
datasets with (88.6% vs. 88.0%) and without additional optical flow information
(82.6% vs. 72.8%).

本论文提出和评估了几个深度神经网络架构，用于对比以往更长时间段内视频图像信息的组合。通过一些新的方法，包括卷积时间特征池化和循环神经网络结构，该论文指出最佳神经网络在 Sports 1 million 数据集（73.1％对 60.9％）和 UCF-101 数据集中（88.6％对 88.0％）及无附加光流信息（82.6％对 72.8％）上明显性能提高。