Interpreting Human Behaviour in Video using FSA's and Object Context

主要研究者：大卫福赛斯标题：使用FSA和对象上下文解释视频中的人类行为理解人们在视频中做什么是计算机视觉尚未解决的重大问题之一。 一个公平的解决方案打开了巨大的应用可能性。 拟议的工作将使用现有的工具，从语音和对象识别社区-特别是，有限状态自动机或FSA的-以获得对活动的理解，依赖于有关身体的详细信息。特别关注的是日常活动。 在这种情况下，固定的词汇表要么不存在，要么不合适。 例如，一个人不知道看起来熟悉的行为的单词。解决这个问题的一种方法是使用符号（例如，拉班符号）;但这种符号通常很难映射到视觉可观察性（例如，运动的权重）。另一种方法是开发一个词汇表，或者开发用于创作模型的表达工具。这个项目将探索第三种方法，即使用有限状态方法快速而有表达地构建行为模型的创作工具。研究将探索一类易于从现有或易于获得的数据中创作的模型。 对某人正在做的事情的解释受到附近物体的影响-一个站在公共汽车站附近的人正在做的事情与一个站在办公室门口的人不同。 研究的模型使得研究对象上下文的这种现象变得实用，使用对象识别文献的最新进展。评估日常行为的模型是困难的，因为没有获得大量标记视频的前景（除其他外，没有一个词汇表来标记它）。 这个项目将使用代理-统计数据，如果没有准确的行为推断，很难从视频中测量，但很容易以其他方式测量-来评估行为表示。 这将使人们能够判断，例如，购买饮料的模型是否准确地代表了概念。智力优势：这个项目将使用与语音中使用的相同的分层创作方法来产生非常大的有限状态行为模型。 将有一个特别强调的行为，需要一个人了解身体的运动配置，一个主题，一直是非常困难的研究，以确定日常行为的词汇的基本构建块的意图。 结果应该包括可以传播的公共行为数据集，而不会遇到隐私问题。对人类运动和行为结构的新见解应该来自（a）对公共场所的人的观察;（B）创作模型的过程;以及（c）识别和建模运动中的组成结构的方法。 该项目应该在计算机视觉中的关键开放和应用问题之一上取得实质性进展。 可以搜索特定行为的视频并计算行为统计数据的方法有着广泛的应用，包括围绕可以观察身体的计算机构建的人机界面;更好地了解人们在公共场合的行为，这将导致更好的建筑规划;更有效地管理监控数据，允许搜索危险行为，同时保护隐私。 教育和机会：这个项目将有助于几个学生的研究生培训，所描述的工作将有助于一个计划的文本计算与人体运动。http://luthuli.cs.uiuc.edu/~daf/action.html

PI: David ForsythTitle: Interpreting Human Behavior in Video using FSA's and Object ContextUnderstanding what people are doing in a video is one of the great unsolved problems of computer vision. A fair solution opens tremendous application possibilities. The proposed work will use existing tools from the speech and object recognition community --- in particular, finite state automata or FSA's --- to obtain an understanding of activities that depend on detailed information about the body.The particular focus is everyday activity. In this case, a fixed vocabulary either doesn't exist, or isn't appropriate. For example, one does not know words for behaviors that appear familiar. One way to deal with this is to work with a notation (for example, laban notation); but such notations typically work in terms that are difficult to map to visual observables (for example, the weight of a motion). The alternatives are either to develop a vocabulary, or to develop expressive tools for authoring models.This project will explore the third approach of building tools for authoring models of behavior quickly and expressively using finite-state methods. Research will explore a class of models that are easy to author from existing, or easily available, data. The interpretation of what someone is doing is affected by the objectsnearby --- a person standing near a bus stop is doing something different from a person standing near an office door. The models studied make it practical to investigate this phenomenon of object context, using recent advances from the object recognition literature.Evaluating models for everyday behaviors is hard, because there is no prospect of obtaining a large collection of marked up video (among other things, there isn't a vocabulary in which to mark it up). This project will use proxies --- statistics that are hard to measure from video without accurate inferences of behavior, but easy to measure in other ways --- to evaluate behavior representations. These will make it possible to tell whether, for example, a model of buying a beverage represents the concept accurately.Intellectual merits: This project will produce very large finite state models of behavior using the same hierarchical authoring methods used in speech. There will be a particular emphasis on behaviors which require one to understand the kinematic configuration of the body, a topic that has been very difficult to study to date, with an intention of identifying basic building blocks of a vocabulary of everyday behavior. The results should include datasets of public behavior that can be disseminated, without encountering privacy concerns. New insights into the structure of human motion and behavior should emerge from (a) observations of people in public; (b) the process of authoring models; and (c) methods for identifying and modelling compositional structure in motion.Broader impact: This project should make substantial progress on one of the key open and applicable problems in computer vision. Methods that can search video for particular behaviors and compute statistics of behaviors have a wide range of applications, including human-computer interfaces built around computers that can watch the body; an improved understanding of what people do in public which will result in better architectural planning; more efficient management of surveillance data, allowing searches for dangerous behaviors while preserving privacy. Education and access: This project will contribute to the graduate training of several students, and work described will contribute to a planned text on computing with human motion.URL: http://luthuli.cs.uiuc.edu/~daf/action.html