Abstract: A method for detecting a demountable accessory in an image-forming device is disclosed. The image-forming device comprises a controller, a print platen suitable for receiving a substrate, and a handling mechanism. The print platen has an optical sensor associated therewith adapted to capture an image of an item on the print platen. A first image is captured. The handling mechanism carries out an adjustment action suitable for adjusting the position of the substrate on the print platen. A second image is captured. The first and second images are analyzed to identify any changes and of the captured images is analyzed to detect an accessory identifier. The presence of an item on the platen is determined from the analysis.

Abstract: A method for detecting a demountable accessory in an image-forming device is disclosed. The image-forming device comprises a controller, a print platen suitable for receiving a substrate, and a handling mechanism. The print platen has an optical sensor associated therewith adapted to capture an image of an item on the print platen. A first image is captured. The handling mechanism carries out an adjustment action suitable for adjusting the position of the substrate on the print platen. A second image is captured. The first and second images are analysed to identify any changes and of the captured images is analysed to detect an accessory identifier. The presence of an item on the platen is determined from the analysis.