Comparison of applied methods. Top left panel: GCs present in the reference catalog from Kartha et al. (2014). Top right panel: GCs detected using the Source Extractor method that are also presented in Kartha et al. (2014). Bottom left panel: GCs detected using the median smoothing method that are also found in Kartha et al. (2014). Bottom right panel: Objects detected using ISOFIT and CMODEL method (Ciambur 2015) that are also reported in Kartha et al. (2014). In the background we show the white image of NGC 1023 used for the detection of sources. FoV is ≈ 0.1 deg².