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arXiv 2110.08063cs.CV
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基于视觉语义嵌入的复杂事件检测镜头可靠识别

Reliable Shot Identification for Complex Event Detection via Visual-Semantic Embedding

School of Computer Science and Technology, Xi’an Jiaotong University(西安交通大学计算机科学与技术学院);School of Computing Technologies, RMIT University(皇家墨尔本理工大学计算技术学院);Nanjing University of Science and Technology(南京理工大学)

Minnan Luo, Xiaojun Chang, Chen Gong

摘要:

多媒体事件检测是在网站上的用户生成的视频中检测感兴趣的特定事件的任务。这一任务面临的最根本的挑战在于视频的质量变化巨大,以及事件本身的高级语义抽象。在本文中,我们将视频分解成几个片段,并直观地将复杂事件检测的任务建模为多实例学习问题,将每个视频表示为一个“袋”的片段,其中每个片段被称为一个实例。我们不是平等对待实例,而是将每个实例与可靠性变量相关联以指示其重要性,然后选择可靠的实例进行训练。为了精确地度量不同实例的可靠性,我们提出了一种视觉语义引导的损失,利用低级别的功能,从视觉信息与实例-事件相似性为基础的高级语义特征。受课程学习的启发,我们引入了一个负弹性网络正则化项,从可靠性高的实例开始训练分类器,并逐渐考虑可靠性相对较低的实例。一种替代的优化算法来解决所提出的具有挑战性的非凸非光滑问题。在标准数据集上的实验结果,即,TRECVID MEDTest 2013和TRECVID MEDTest 2014证明了所提出的方法相对于基线算法的有效性和优效性。

英文摘要:

Multimedia event detection is the task of detecting a specific event of interest in an user-generated video on websites. The most fundamental challenge facing this task lies in the enormously varying quality of the video as well as the high-level semantic abstraction of event inherently. In this paper, we decompose the video into several segments and intuitively model the task of complex event detection as a multiple instance learning problem by representing each video as a "bag" of segments in which each segment is referred to as an instance. Instead of treating the instances equally, we associate each instance with a reliability variable to indicate its importance and then select reliable instances for training. To measure the reliability of the varying instances precisely, we propose a visual-semantic guided loss by exploiting low-level feature from visual information together with instance-event similarity based high-level semantic feature. Motivated by curriculum learning, we introduce a negative elastic-net regularization term to start training the classifier with instances of high reliability and gradually taking the instances with relatively low reliability into consideration. An alternative optimization algorithm is developed to solve the proposed challenging non-convex non-smooth problem. Experimental results on standard datasets, i.e., TRECVID MEDTest 2013 and TRECVID MEDTest 2014, demonstrate the effectiveness and superiority of the proposed method to the baseline algorithms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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