Recently, video captioning has been attracting an increasing amount of interest, due to its potential for improving accessibility and information retrieval. While existing methods rely on different kinds of visual features and model structures, they do not fully exploit relevant semantic information. We present an extensible approach to jointly leverage several sorts of visual features and semantic attributes. Our novel architecture builds on LSTMs for sentence generation, with several attention layers and two multimodal layers. The attention mechanism learns to automatically select the most salient visual features or semantic attributes, and the multimodal layer yields overall representations for the input and outputs of the sentence generation component. Experimental results on the challenging MSVD and MSR-VTT datasets show that our framework outperforms the state-of-the-art approaches, while ground truth based semantic attributes are able to further elevate the output quality to a near-human level.

本文提出了一种新的视频字幕生成方法，利用多种视觉特征和语义属性的层次，采用LSTM网络进行句子生成，实现自动选取最突出的视觉特征或语义属性，有望提高字幕生成的精确度。实验结果表明，该框架胜过现有最先进的方法，并可进一步提升精度至近于人类水平。

多面向注意力的视频字幕生成