Richard Youmaran

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This paper develops a new approach to understand and measure variations in biometric sample quality. We begin with the intuition that degradations to a biometric sample will reduce the amount of identiiable information available. In order to measure the amount of identiiable information, we deene biometric information as the decrease in uncertainty about(More)
Visual Cryptography is based on cryptography where n images are encoded in a way that only the human visual system can decrypt the hidden message without any cryptographic computations when all shares are stacked together. This paper presents an improved algorithm based on Chang's and Yu visual cryptography scheme for hiding a colored image into multiple(More)
We ask: how many bits of information (in the Shannon sense) do we get from a set of EIT measurements? Here, the term information in measurements (IM) is defined as: the decrease in uncertainty about the contents of a medium, due to a set of measurements. This decrease in uncertainty is quantified by the change from the inter-class model, q, defined by the(More)
This paper develops an approach to measure the information content of a biometric feature representation. We define biometric information as the decrease in uncertainty about the identity of a person due to a set of biometric measurements. We then show that the biometric feature information for a person may be calculated by the relative entropy D(pq)(More)
  • Andy Adler, David Dawson, Robert Evans, Laurin Garland, Mike Miller, Ian Sinclair +1 other
  • 2011
Conducted Energy Weapons (CEWs), such as those manufactured by TASER International Inc., are seeing increased use by law enforcement agencies as a less lethal force option; but, at the same time, these weapons are also seeing an increased level of concern in terms of their safety of use. In order to enable consistent evaluation of CEW performance, a(More)
  • R Youmaran, P Dicorato, R Munger, T Hall, A Adler
  • 2005
In closed angled Glaucoma, fluid pressure in the eye increases because of inadequate fluid flow between the iris and the cornea. One important technique to assess patients at risk of glaucoma is to analyze ultrasound images of the eye to detect the structural changes. We propose an algorithm to automatically identify important features in the ultrasound(More)
—Current background subtraction methods require background modeling to handle dynamic backgrounds. The purpose of our study is to investigate a background template substraction method to detect foreground objects in the presence of background variations. The method uses a single reference image but the change detection process allows change in the(More)