کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10360329 | 869777 | 2014 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Humans in groups: The importance of contextual information for understanding collective activities
ترجمه فارسی عنوان
انسان در گروه: اهمیت اطلاعات متنی برای درک فعالیت های جمعی
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کلمات کلیدی
تشخیص فعالیت جمعی، طبقه بندی جهت گیری فضایی افراد، شرح مفاهیم افراد، هسته گراف، یادگیری نیمه نظارتی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
چشم انداز کامپیوتر و تشخیص الگو
چکیده انگلیسی
In this work we consider the problem of modeling and recognizing collective activities performed by groups of people sharing a common purpose. For this aim we take into account the social contextual information of each person, in terms of the relative orientation and spatial distribution of people groups. We propose a method able to process a video stream and, at each time instant, associate a collective activity with each individual in the scene, by representing the individual - or target - as a part of a group of nearby people - the target group. To generalize with respect to the viewpoint we associate each target with a reference frame based on his spatial orientation, which we estimate automatically by semi-supervised learning. Then, we model the social context of a target by organizing a set of instantaneous descriptors, capturing the essence of mutual positions and orientations within the target group, in a graph structure. Classification of collective activities is achieved with a multi-class SVM endowed with a novel kernel function for graphs. We report an extensive experimental analysis on benchmark datasets that validates the proposed solution and shows significant improvements with respect to state-of-art results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pattern Recognition - Volume 47, Issue 11, November 2014, Pages 3535-3551
Journal: Pattern Recognition - Volume 47, Issue 11, November 2014, Pages 3535-3551
نویسندگان
Nicoletta Noceti, Francesca Odone,