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Starner, Thad

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    Multimodel gestural control using on-body sensors
    (Georgia Institute of Technology, 2006-06-01) Starner, Thad
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    Reading on the Go: An Evaluation of Three Mobile Display Technologies
    (Georgia Institute of Technology, 2006) Vadas, Kristin ; Lyons, Kenton Michael ; Ashbrook, Daniel ; Yi, Ji Soo ; Starner, Thad ; Jacko, Julie A.
    As mobile technology becomes a more integral part of our everyday lives, understanding the impact of different displays on perceived ease of use and overall performance is becoming increasingly important. In this paper, we evaluate three mobile displays: the MicroOptical SV-3, the Sony Librie, and the OQO Model 01. These displays each use different underlying technologies and offer unique features which could impact mobile use. The OQO is a hand-held device that utilizes a traditional transflective liquid crystal display (LCD). The MicroOptical SV-3 is a head-mounted display that uses a miniature LCD and offers hands free use. Finally, the Librie uses a novel, low power reflective electronic ink technology. We present a controlled 15-participant evaluation to assess the effectiveness of using these displays for reading while in motion.
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    Revisiting and Validating a Model of Two-Thumb Text Entry
    (Georgia Institute of Technology, 2006) Clarkson, Edward C. ; Lyons, Kenton Michael ; Clawson, James ; Starner, Thad
    MacKenzie and Soukoreff have previously introduced a Fitts' Law--based performance model of expert two--thumb text entry on mini--QWERTY keyboards. In this work we validate the original model and update it to account for observed behavior. We conclude by corroborating our updated version of the model with our empirical data. The result is a validated model of two-thumb text entry that can inform the design of mobile computing devices.
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    Handheld, Non-Contact Wound Measurement Device
    (Georgia Institute of Technology, 2006) Sprigle, Stephen ; Patel, Nirmal ; Joshi, Aditya ; Starner, Thad
    Repeatable and accurate wound measurement forms an important part in the assessment and treatment of chronic wounds and pressure ulcers. Current wound measurement methods span a continuum, from the ruler method which is easy to perform but lacks accuracy to devices using stereophotogrammetry which are accurate and repeatable but are expensive. A prototype handheld wound measurement system has been developed that measures wounds without contact, processes images in <1 min and is low cost. The device is based upon a simple digital camera such as those found in cell phones. Using computer vision techniques, device software suggests a wound boundary and gives the calculated area. The user can then 1) accept the area (if the wound boundary detection is correct), 2) modify the wound boundary by dragging the outline using a stylus on the touch screen, or 3) reject the wound boundary and retrace the wound manually using the stylus. Accurate wound dimensions using photography require knowing the distance between the camera and wound and the ability to correct for a skewed image. The use of four laser pointers and computer vision techniques overcome these technical challenges. To test accuracy, repeatability and skew correction, a model wound with known dimensions was measured at four distances and skew angles between 0º and 35º. Accuracy across distance and skewness ranged from 5%-7.5% with a coefficient of variation (repeatability) of <4%. This performance exceeds values reported for rulers, tracing methods and photography and equals performance of higher cost structured light devices.