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arXiv 2101.03478cs.CVcs.HC
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利用移动摄像机和少量训练样本的活动识别:在自闭症相关头部撞击检测中的应用

Activity Recognition with Moving Cameras and Few Training Examples: Applications for Detection of Autism-Related Headbanging

Stanford University(斯坦福大学)

Peter Washington, Aaron Kline, Onur Cezmi Mutlu, Emilie Leblanc, Cathy Hou, Nate Stockham, Kelley Paskov, Brianna Chrisman, Dennis P. Wall

摘要:

活动识别计算机视觉算法可用于通过诊断仪器检测自闭症相关行为的存在,包括所谓的“限制性和重复性行为”或刺激。在这个领域中存在的有限的数据通常是用手持摄像机记录的,该摄像机可能是摇晃的甚至是移动的,这对用于活动检测的传统特征表示方法构成了挑战,该方法错误地将摄像机的运动捕获为特征。为了解决这些问题,我们首先记录当前的活动识别的特征表示技术的优点和局限性时,适用于头部撞击检测。然后,我们提出了一个专门的头部姿势的关键点组成的特征表示。我们创建了一个计算机视觉分类器,用于使用时间分布式卷积神经网络(CNN)检测家庭视频中的头部撞击,其中单个CNN从输入序列中的每一帧中提取特征,并将这些提取的特征作为输入馈送到长短期记忆(LSTM)网络。在预测来自自刺激行为数据集(SSBD)的视频中的头部撞击和没有头部撞击的二元任务中,当确保在所有折叠中没有出现在训练集中的儿童出现在测试集中时,我们使用3折交叉验证(单个折叠F1分数为83.3%、89.0%和100.0%)达到90.77%的平均F1分数。这项工作记录了一个成功的技术,用于训练计算机视觉分类器,它可以检测人体运动与几个训练样本,甚至当摄像机记录的源剪辑是不稳定的。这里描述的一般方法可以应用于其他人体运动和姿势分类问题中使用的移动和无处不在的交互系统的交互系统的设计者和开发人员。

英文摘要:

Activity recognition computer vision algorithms can be used to detect the presence of autism-related behaviors, including what are termed "restricted and repetitive behaviors", or stimming, by diagnostic instruments. The limited data that exist in this domain are usually recorded with a handheld camera which can be shaky or even moving, posing a challenge for traditional feature representation approaches for activity detection which mistakenly capture the camera's motion as a feature. To address these issues, we first document the advantages and limitations of current feature representation techniques for activity recognition when applied to head banging detection. We then propose a feature representation consisting exclusively of head pose keypoints. We create a computer vision classifier for detecting head banging in home videos using a time-distributed convolutional neural network (CNN) in which a single CNN extracts features from each frame in the input sequence, and these extracted features are fed as input to a long short-term memory (LSTM) network. On the binary task of predicting head banging and no head banging within videos from the Self Stimulatory Behaviour Dataset (SSBD), we reach a mean F1-score of 90.77% using 3-fold cross validation (with individual fold F1-scores of 83.3%, 89.0%, and 100.0%) when ensuring that no child who appeared in the train set was in the test set for all folds. This work documents a successful technique for training a computer vision classifier which can detect human motion with few training examples and even when the camera recording the source clips is unstable. The general methods described here can be applied by designers and developers of interactive systems towards other human motion and pose classification problems used in mobile and ubiquitous interactive systems.

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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