Materials-based 3D segmentation of unknown objects from dual-energy computed tomography imagery in baggage security screening. Issue 6 (June 2015)

• Record Type: Journal Article
• Authors: Mouton, Andre; Breckon, Toby P.
• Is Part Of: Pattern recognition. Volume 48:Issue 6(2015:Jun.)
• Page Start: 1961
• Page End: 1978
• Publication Date: 2015-06
• Subjects: Pattern perception -- Periodicals; Perception des structures -- Périodiques; Patroonherkenning; 006.4
• DOI: 10.1016/j.patcog.2015.01.010
• Languages: English
• ISSNs: 0031-3203

Abstract

<abstract abstract-type="author" id="ab0005"> <title id="sect0005">Abstract</title> <sec> <p id="sp0155">We present a novel technique for the 3D segmentation of unknown objects from cluttered dual-energy Computed Tomography (CT) data obtained in the baggage security-screening domain. Initial materials-based coarse segmentations, generated using the Dual-Energy Index (DEI), are refined by partitioning at automatically detected regions. Partitioning is guided by a novel random forest based quality metric, trained to recognise high-quality, single-object segments. A second novel segmentation quality measure is presented for quantifying the quality of full segmentations based on the random forest metric of the constituent parts and the error in the number of objects segmented. In a comparative evaluation between the proposed approach and three state-of-the-art volumetric segmentation techniques designed for single-energy CT data (two region-growing <xref id="crs0005" rid="bib1 bib2">[1, 2]</xref> and one graph-based <xref id="cr0165" rid="bib3">[3]</xref>) our method is shown to outperform both region-growing methods in terms of segmentation quality and speed. Although the graph-based approach generates more accurate partitions, it is characterised by high processing times and is significantly outperformed by the proposed method in this regard. The observations made in this study indicate that the proposed segmentation technique is well-suited to the baggage security-screening domain, where the demand for computational efficiency is paramount to maximise throughput.</p> </sec> </abstract>