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Generic, deformable models for 3-d vehicle surveillance.

机译:用于3D车辆监控的通用,可变形模型。

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摘要

Vehicle surveillance is the task of measuring moving road vehicles to automatically obtain information about vehicle shape, appearance, identity, path of motion, and, ultimately, driver behavior. While various vehicle sensors exist, none are as versatile as the surveillance camera. Computer vision algorithms can interpret digital images to make a wide variety of vehicle measurements using a single sensor. An ideal algorithm would reconstruct a detailed three-dimensional (3-d) representation of the dynamic traffic scene complete with 3-d vehicle surfaces, trajectories of motion, and identities. Unfortunately, much of the 3-d information is lost during the projection of the world into a 2-d image. As a result, the reconstruction problem is ill-posed. Several researchers have addressed this problem by incorporating prior knowledge about the world to rule out implausible reconstructions. Specifically, in the case of vehicle surveillance, a prior model of 3-d vehicle shape is often used. A constrained alignment of the model to images allows for 3-d shape recovery, tracking, and recognition. Previous 3-d vehicle models are either generic but overly simple or rigid and overly complex. Rigid models represent exactly one vehicle design, so a large collection is needed. A single generic model can deform to a wide variety of shapes, but those shapes have been far too primitive. This thesis presents a new generic 3-d vehicle model that deforms to match a wide variety of passenger vehicles. It is adjustable in complexity between the two extremes. The model is aligned to images by predicting and matching image intensity edges. Novel algorithms are presented for fitting models to images, tracking in video, and learning shape deformation from a collection of detailed rigid models. Experiments compare the proposed model to simple generic models in accuracy and reliability of 3-d shape recovery from images and tracking in video. Standard techniques for recognition are also used to compare the models. The proposed model out performs the existing simple models at each task. Yet, there is still much room for improvement, especially since training data is limited.
机译:车辆监视是测量行驶中的道路车辆以自动获取有关车辆形状,外观,身份,运动路径以及最终驾驶员行为的信息的任务。尽管存在各种车辆传感器,但没有任何一个像监视摄像机那样用途广泛。计算机视觉算法可以使用单个传感器解释数字图像,以进行各种车辆测量。理想的算法将重建具有3d车辆表面,运动轨迹和身份的动态交通场景的详细三维(3-d)表示。不幸的是,在将世界投影为2D图像时,许多3D信息会丢失。结果,重建问题不适当。一些研究人员通过结合有关世界的先验知识来解决这个问题,以排除难以置信的重建。具体地,在车辆监视的情况下,经常使用3-d车辆形状的现有模型。模型与图像的约束对齐允许进行3维形状恢复,跟踪和识别。先前的3D车辆模型要么通用,要么过于简单,要么僵化,要么过于复杂。刚性模型仅代表一种车辆设计,因此需要大量的收藏。单个通用模型可以变形为多种形状,但是这些形状太原始了。本文提出了一种新的通用3D车辆模型,该模型可以变形以匹配各种乘用车。在两个极端之间,它的复杂度是可调整的。通过预测和匹配图像强度边缘使模型与图像对齐。提出了用于将模型拟合到图像,在视频中进行跟踪以及从详细的刚性模型集合中学习形状变形的新颖算法。实验将提出的模型与简单的通用模型进行了比较,从图像和视频跟踪中恢复3D形状的准确性和可靠性。识别的标准技术也用于比较模型。提出的模型在每个任务上执行现有的简单模型。但是,仍有很大的改进空间,尤其是由于培训数据有限。

著录项

  • 作者

    Leotta, Matthew J.;

  • 作者单位

    Brown University.;

  • 授予单位 Brown University.;
  • 学科 Engineering Electronics and Electrical.;Computer Science.;Artificial Intelligence.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 248 p.
  • 总页数 248
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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