ViTA: A flexible CAD-tool-independent automatic grading platform for two-dimensional CAD drawings

Journal Article (Journal Article)

Grading engineering drawings takes a significant amount of an instructor’s time, especially in large classrooms. In many cases, teaching assistants help with grading, adding levels of inconsistency and unfairness. To help in grading automation of CAD drawings, this paper introduces a novel tool that can completely automate the grading process after students submit their work. The introduced tool, called Virtual Teaching Assistant (ViTA), is a CAD-tool-independent platform that can work with exported drawings originating from different CAD software having different export settings. Using computer vision techniques applied to exported images of the drawings, ViTA can not only recognize whether or not a two-dimensional (2 D) drawing is correct, but also offers the detection of many important orthographic and sectional view mistakes such as mistakes in structural features, outline, hatching, orientation, scale, line thickness, colors, and views. We show ViTA’s accuracy and its relevance in the automated grading of 2 D CAD drawings by evaluating it using 500 student drawings created with three different CAD software.

Full Text

Duke Authors

Cited Authors

  • Younes, R; Bairaktarova, D

Published Date

  • January 1, 2022

Published In

Volume / Issue

  • 50 / 1

Start / End Page

  • 135 - 157

Electronic International Standard Serial Number (EISSN)

  • 2050-4586

International Standard Serial Number (ISSN)

  • 0306-4190

Digital Object Identifier (DOI)

  • 10.1177/0306419020947688

Citation Source

  • Scopus