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@InProceedings{BorsatoMori:2018:AsStSt,
               author = "Borsato, Frank Helbert and Morimoto, Carlos Hitoshi",
          affiliation = "{Universidade Tecnol{\'o}gica Federal do Paran{\'a}} and 
                         {Universidade de S{\~a}o Paulo}",
                title = "Asynchronous stroboscopic structured lighting image processing 
                         using low-cost cameras",
            booktitle = "Proceedings...",
                 year = "2018",
               editor = "Ross, Arun and Gastal, Eduardo S. L. and Jorge, Joaquim A. and 
                         Queiroz, Ricardo L. de and Minetto, Rodrigo and Sarkar, Sudeep and 
                         Papa, Jo{\~a}o Paulo and Oliveira, Manuel M. and Arbel{\'a}ez, 
                         Pablo and Mery, Domingo and Oliveira, Maria Cristina Ferreira de 
                         and Spina, Thiago Vallin and Mendes, Caroline Mazetto and Costa, 
                         Henrique S{\'e}rgio Gutierrez and Mejail, Marta Estela and Geus, 
                         Klaus de and Scheer, Sergio",
         organization = "Conference on Graphics, Patterns and Images, 31. (SIBGRAPI)",
            publisher = "IEEE Computer Society",
              address = "Los Alamitos",
             keywords = "stroboscopic structured lighting, rolling shutter, asynchronous 
                         lighting.",
             abstract = "Structured lighting (SL) image processing relies on the generation 
                         of known illumination patterns synchronized with the camera frame 
                         rate and is commonly implemented using syncing capable cameras. In 
                         general, such cameras employ global shutters, that exposes the 
                         whole frame at once. However, most modern digital cameras use 
                         rolling shutters, which expose each line at different intervals, 
                         impairing most structured lighting applications. In this paper we 
                         introduce an asynchronous SL technique that can be used by any 
                         rolling shutter digital camera. While the use of stroboscopic 
                         illumination partially solves for the line exposure shift, the 
                         phase difference between the camera and lighting clocks results in 
                         stripe artifacts that move vertically in the video stream. These 
                         stripes are detected and tracked using a Kalman filter. Two 
                         asynchronous stroboscopic SL methods are proposed. The first 
                         method, image differencing, minimizes the stripe artifacts. The 
                         second method, image compositing, completely removes the 
                         artifacts. We demonstrate the use of the asynchronous differential 
                         lighting technique in a pupil detector using a low-cost high-speed 
                         camera with no synchronization means, with the lighting running 
                         independently at a higher, unknown frequency to the application.",
  conference-location = "Foz do Igua{\c{c}}u, PR, Brazil",
      conference-year = "Oct. 29 - Nov. 1, 2018",
             language = "en",
           targetfile = "sibgrapi2018.pdf",
        urlaccessdate = "2020, Nov. 29"
}


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