نبذة مختصرة : International audience ; The ChemCam and SuperCam instruments onboard the Curiosity and Perseverance Martian rovers provide high-resolution imaging capabilities thanks to their Remote Microscopic Imager (RMI) cameras [1, 2, 3, 4]. RMI images are critical to document the spectroscopic analyses (LIBS for ChemCam and LIBS, Raman and passive infrared for SuperCam). They also provide a powerful tool to investigate the detailed texture and morphology of soils and rocks, and to perform geologic investigations at a long distance in Gale and Jezero craters, extending the scientific reach of rover assets.In both cases, the standard calibration pipeline of RMI images provides accurate corrections of most of the observations. In a few cases, in very specific observing geometries, we sometimes observe a more or less pronounced bright halo at the edges of the images, which may come from stray light. This effect is currently not fully accounted for in the standard calibration pipeline of the two instruments. We here discuss some post-processing imaging tests aimed at evaluating this residual halo effect and decreasing its contribution in order to homogenize the mosaics.
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