Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
* besma@utk.edu; phone 865 974-9918; fax 865 974-5459 Grayscale enhancement techniques of x-ray images of carry-on luggage
 

Summary: * besma@utk.edu; phone 865 974-9918; fax 865 974-5459
Grayscale enhancement techniques of x-ray images of carry-on luggage
Besma Abidi*, Mark Mitckes, Mongi Abidi, and Jimin Liang
University of Tennessee Imaging, Robotics, and Intelligent Systems Laboratory
317 Ferris Hall, Knoxville, TN 37996-2100
ABSTRACT
Very few image processing applications dealt with x-ray luggage scenes in the past. In this paper, a series of common
image enhancement techniques are first applied to x-ray data and results shown and compared. A novel simple
enhancement method for data de-cluttering, called image hashing, is then described. Initially, this method was applied using
manually selected thresholds, where progressively de-cluttered slices were generated and displayed for screeners. Further
automation of the hashing algorithm (multi-thresholding) for the selection of a single optimum slice for screener
interpretation was then implemented. Most of the existing approaches for automatic multi-thresholding, data clustering, and
cluster validity measures require prior knowledge of the number of thresholds or clusters, which is unknown in the case of
luggage scenes, given the variety and unpredictability of the scene's content. A novel metric based on the Radon transform
was developed. This algorithm finds the optimum number and values of thresholds to be used in any multi-thresholding or
unsupervised clustering algorithm. A comparison between the newly developed metric and other known metrics for image
clustering is performed. Clustering results from various methods demonstrate the advantages of the new approach.
Keywords: luggage scenes, threat detection, x-ray, image enhancement, decluttering, auto-thresholding, cluster validity
1. INTRODUCTION
Luggage inspection is an essential process for airports and airplane security due to the presence of large crowds (customers

  

Source: Abidi, Mongi A. - Department of Electrical and Computer Engineering, University of Tennessee

 

Collections: Computer Technologies and Information Sciences