The robust detection of stars on CCD images

Two parameters are developed to analyze the CCD images from ground-based an d/or space telescopes. The first parameter, deduced from the intensity prof ile of the object sharp, is useful to resolve stars and hot pixels. The sec ond parameter shape distinguishes the stars from the background cosmic-ray events using geometric characteristics defined by its shapes. The parameter s are applied to a simulated OMC/INTEGRAL image and a HST image.