@Misc{FialhoCarv:2022:DaFrFl,
               author = "Fialho, M{\'a}rcio Afonso Arimura and Carvalho, Camila Miranda",
                title = "Dark Frame and Flat Field corrections for images generated by a 
                         CMOS image sensor used in a star tracker",
                 year = "2022",
                 date = "S{\~a}o Jos{\'e} dos Campos, SP",
           targetfile = "poster_XXI_CBDO_en.pdf",
             abstract = "This work presents improvements obtained in night sky images 
                         generated by a star tracker after basic dark frame and flat field 
                         corrections are applied. These operations led to reduced noise in 
                         images and corresponding improvements in detection of faint stars. 
                         Improvements in signal to noise ratio and in centroiding accuracy 
                         are also presented. To reduce the effects of temporal noise when 
                         applying these corrections, averages of hundreds of dark frames 
                         and flat field frames were used. Night sky images acquired by this 
                         star tracker will be used in a future work as an alternative 
                         method to perform its geometric calibration, using the observed 
                         stars as a calibration source. The goal of dark field and flat 
                         field corrections is to improve centroiding accuracy by mitigating 
                         fixed pattern noise and vignetting, therefore improving geometric 
                         calibration of this star tracker.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
             language = "en",
        urlaccessdate = "16 jun. 2024"
}