Conditional Random Field Features and Structure Assessment for Digital Terrain Modeling

Tito Arevalo-Ramirez, Fernando Auat Cheein*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
55 Downloads (Pure)

Abstract

The conditional random field is a suitable framework for contextual classification of two-dimensional (images) and three-dimensional (point clouds) data. This framework is based on probabilistic graphical models, an alternative representation of a conditional probability distribution over random variables. In general, a graphical model encodes probabilistic relationships between random variables by their edges. However, graph structure (set of edges) is not always known in advance. In particular, if we consider each point of a point cloud as a graph node, we might not have information about nodes interaction (i.e. graph structure is unknown). Given that there is no agreement about what structure to use for point cloud contextual classification, we focused on determining a suitable graph structure by comparing the performance of four different graph structures and twenty feature sets. All experiments were performed in urban environments. The quantitative errors (type I, type II and total error) and classification accuracy were the metrics we used to evaluate the performance of Conditional Random Fields. Results suggest that optimal neighbor and 3D Delaunay structures achieved best classification performance. Theses structures combined with point-slope, curvature, and segment height node based features performed a classification accuracy error of 93.5% and the best type I error, 1.56%.

Original languageEnglish
Pages (from-to)37146-37155
Number of pages10
JournalIEEE Access
Volume9
Early online date23 Feb 2021
DOIs
Publication statusPublished - 2021

Keywords

  • Conditional random field
  • graph structure
  • ground filtering
  • machine learning

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering
  • Electrical and Electronic Engineering

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