Syed A. Rizvi

Learn More
Two of the most critical requirements in support of producing reliable face-recognition systems are a large database of facial images and a testing procedure to evaluate systems. The Face Recognition Technology (FERET) program has addressed both issues through the FERET database of facial images and the establishment of the FERET tests. To date, 14,126(More)
Two critical performance characterizations of biometric algorithms, including face recognition, are identiication and veriication. In face recognition, FERET is the de facto standard evaluation methodology. Identiication performance of face recognition algorithms on the FERET tests has been previously reported. In this paper we report on veriication(More)
Advances in residual vector quantization (RVQ) are surveyed. Definitions of joint encoder optimality and joint decoder optimality are discussed. Design techniques for RVQs with large numbers of stages and generally different encoder and decoder codebooks are elaborated and extended. Fixed-rate RVQs, and variable-rate RVQs that employ entropy coding are(More)
Two key performance characterization of biometric algorithms (face recognition in particular) are (1) verification performance and (2) and performance as a function of database size and composition. This characterization is required for developing robust face recognition algorithms and for successfully transitioning algorithms from the laboratory to real(More)
Multiple sclerosis (MS), a neurologic disorder that affects 400,000 persons in the United States, consists of an inflammatory and a neurodegenerative phase. Treatment options now approved by the FDA specifically target the inflammatory phase of MS and include immunomodulators (i.e., interferon betas and glatiramer acetate) and an immunosuppressant,(More)
The finite-state vector quantization scheme called dynamic finite-state vector quantization (DFSVQ) is investigated with regard to its subcodebook construction. In the DFSVQ, each input block is encoded by a small codebook called the subcodebook which is created from a much larger codebook called supercodebook. Each subcodebook is constructed by selecting,(More)
The symptoms that affect individuals with MS are diverse and change over time. Addressing symptoms in a multidisciplinary fashion and helping patients address problems as they occur are the major elements of symptom management. Successful management involves treating not only the more readily recognized manifestations of MS but also the less apparent MS(More)
Research into therapy for multiple sclerosis (MS) is occurring at a rapid pace, and current treatment options approved by the FDA specifically target the inflammatory phase of MS. However, drugs that are not FDA-approved are routinely used to treat MS. One example is corticosteroids, which are commonly used to treat acute relapses. Other drugs that are(More)