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arXiv 2305.05534cs.CVcs.LG

整合整体与局部信息以估计情绪反应强度

Integrating Holistic and Local Information to Estimate Emotional Reaction Intensity

Hong Kong University of Science and Technology(香港科技大学);Bright Nation Limited(Bright Nation有限公司)

Yini Fang, Liang Wu, Frederic Jumelle, Bertram Shi

AI总结:

提出一种结合视频和音频的多模态架构,利用整体与局部特征及Transformer回归标记估计情绪反应强度,在ABAW5挑战中取得显著优于基线的性能。

摘要:

基于视频的情绪反应强度(ERI)估计通过受试者观看刺激时的视频,衡量其反应在多个情绪维度上的强度。我们提出了一种用于基于视频的ERI的多模态架构,该架构结合了视频和音频信息。视频输入首先在空间上进行逐帧编码,将编码受试者面部表情整体方面的特征与编码表情空间局部方面的特征相结合。随后,输入在时间维度上进行整合:首先使用门控循环单元(GRU)进行逐帧处理,然后通过Transformer进行全局处理。我们通过一个回归标记处理可变视频长度,该标记将所有帧的信息累积到一个与视频长度无关的固定维度向量中。音频信息的处理方式类似:每帧内提取的频谱信息通过GRU和带回归标记的Transformer级联在时间上进行整合。视频和音频回归标记的输出通过拼接合并,然后输入到最终的全连接层以生成强度估计。我们的架构在第五届野外情感行为分析竞赛(ABAW5)的ERI估计挑战中,在Hume-Reaction数据集上取得了优异的性能。估计分数与受试者自我报告分数之间的皮尔逊相关系数在所有情绪上的平均值在验证数据集上为0.455,在测试数据集上为0.4547,远高于基线。Transformer的自注意力机制使我们的架构能够聚焦于最关键的帧,而无论视频长度如何。消融实验证实了结合整体/局部特征以及多模态集成的优势。代码可在https://github.com/HKUST-NISL/ABAW5获取。

英文摘要:

Video-based Emotional Reaction Intensity (ERI) estimation measures the intensity of subjects' reactions to stimuli along several emotional dimensions from videos of the subject as they view the stimuli. We propose a multi-modal architecture for video-based ERI combining video and audio information. Video input is encoded spatially first, frame-by-frame, combining features encoding holistic aspects of the subjects' facial expressions and features encoding spatially localized aspects of their expressions. Input is then combined across time: from frame-to-frame using gated recurrent units (GRUs), then globally by a transformer. We handle variable video length with a regression token that accumulates information from all frames into a fixed-dimensional vector independent of video length. Audio information is handled similarly: spectral information extracted within each frame is integrated across time by a cascade of GRUs and a transformer with regression token. The video and audio regression tokens' outputs are merged by concatenation, then input to a final fully connected layer producing intensity estimates. Our architecture achieved excellent performance on the Hume-Reaction dataset in the ERI Esimation Challenge of the Fifth Competition on Affective Behavior Analysis in-the-Wild (ABAW5). The Pearson Correlation Coefficients between estimated and subject self-reported scores, averaged across all emotions, were 0.455 on the validation dataset and 0.4547 on the test dataset, well above the baselines. The transformer's self-attention mechanism enables our architecture to focus on the most critical video frames regardless of length. Ablation experiments establish the advantages of combining holistic/local features and of multi-modal integration. Code available at https://github.com/HKUST-NISL/ABAW5.

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