Photos of construction projects are as common as hardhats and work boots on a jobsite these days.

但是，如果施工人员可以使用照片和视频在几秒钟内使用照片和视频来组装其项目的更新的3D建筑信息模型，以使用该覆盖层来检查建筑物在4D BIM时间表上的进度，该怎么办？

这只是由弗吉尼亚理工学院和州立大学建设工程教授和学生开发的混合4D增强现实平台（4DAR）平台的可能性和新应用程序的一个例子。由于其能够以实时的和精确的精度将工作现场数据与虚拟BIM数据合并，因此该技术正在在创新者和吸引开发人员之间引起嗡嗡声。

该技术由Mani Golparvar教授，Jules White教授和研究生Hyojoon Bae开发，该技术已从弗吉尼亚理工学院获得许可PAR Works Inc.,由Golparvar-Fard 8月启动了and White and funded by a $1-million investment from venture firm Allied Minds, Boston. The platform works with algorithms developed by the researchers that let smart-device owners use images to retrieve customized, information tagged to any building, product, street scene or object.

他们称该平台为移动增强现实系统（MARS）。与其他类型的增强现实应用程序不同，只能在卫星接收方面最有效，该技术不需要任何GPS，无线或标记来进行本地化。研究人员在一份有关该技术的屡获殊荣的研究论文中写道：“从施工站点图像中产生物理模型在计算上是昂贵的，可能需要数小时。”

"Producing a physical model from a set of construction photographs requires non-linear multi-dimensional optimization as well as exhaustive matching of the photographs in the data set. A specific aim of our proposed work is to overcome these challenges, speeding up overall time of 3D reconstruction and localization by developing and optimizing enhanced structure from motion algorithms," they note. Golparvar-Fard says MARS provides augmented-reality overlays at millimeter-level accuracy on images or other data types.

The overlay of information may not be in real time, but it's close enough. The interval between uploading the image to the server and augmenting it with context information such as BIM data, is one to four seconds. The platform's precision in rendering the data over the image sets a new benchmark.

"This should address some of the challenges of using AR for the construction industry and can significantly improve field reporting systems that benefit from iPads, such as Autodesk [BIM 360 Field]," says Golparvar-Fard, who is settling in as a faculty member at University of Illinois at Urbana-Champaign after developing the platform at Virginia Tech. The company says the platform's bread-and-butter use is for converting 2D files to 3D point-cloud models. From there, the possibilities can grow as thousands of workers start taking images of a jobsite and integrate them with BIM data.

怀特说：“我们的许多技术都是您如何有效，迅速地支持[覆盖]。”“覆盖层可以包含任何类型的信息。它可以是视频，可以是另一张照片，它可以是BIM模型中的信息或承包商的时间表。

每个覆盖物本质上都有一个与之相关的标识符，您可以将其附加到您想要的任何[类型]信息上。通过举行应用程序开发竞赛的应用程序，用于火星平台的应用程序。开发人员的AR应用程序最佳地判断了最佳的AR应用程序（即使是这个世界之外）的现金25,000美元，并于3月在South By South By South By South（SXSW）会议上亮相。