Enhancement of sketch contours on paintings infrared photographies: A comparison

This work reports and illustrates the application of optimal filtering to enhance sketch contours on infrared photograhies of wood paintings. In [14] the authors tested three approaches of the symmetric exponential filter of an infinitely large window size proposed by Shen and Castan [13]: the DRF, GEF and SDEF filters. The DRF filter presented the best results and was chosen to have a fine tuning of its parameters. In this paper the DRF filter results obtained in [14] are now compared to methods proposed by Marr [9] and Canny [12].