Multi-task Joint Learning for Videos in the Wild

Most of the conventional state-of-the-art methods for video analysis achieve outstanding performance by combining two or more different inputs, e.g. an RGB image, a motion image, or an audio signal, in a two-stream manner. Although these approaches generate pronounced performance, it underlines that each considered feature is tantamount in the classification of the video. This dilutes the nature of each class that every class depends on the different levels of information from different features. To incorporate the nature of each class, we present the class nature specific fusion that combines the features with a different level of weights for the optimal class result. In this work, we first represent each frame-level video feature as a spectral image to train convolutional neural networks (CNNs) on the RGB and audio features. We then revise the conventional two-stream fusion method to form a class nature specific one by combining features in different weight for different classes. We evaluate our method on the Comprehensive Video Understanding in the Wild dataset to understand how each class reacted on each feature in wild videos. Our experimental results not only show the advantage over conventional two-stream fusion, but also illustrate the correlation of two features: RGB and audio signal for each class.