deda_compare_prints

deda_compare_prints [options] file...

deda_compare_prints reads the tracking-dot pattern on each scan and groups the files by the printer it detected. When every file resolves to the same printer, it prints IDENTICAL. Otherwise it prints how many printers it found, a manufacturer label for each group, and the paths in that group. Files it could not read are listed under Errors.The scans should be lossless and about 300 dpi, the same kind of input deda_parse_print expects.

file...

One or more scans. At least one path is required.

Resolution of the scans. 0, the default, asks the reader to detect it.

Repeat to print more diagnostic detail.

A page with no detectable dots, or a pattern this toolkit does not know, shows up as an error or as its own group. That is not evidence that the printers differ. Pass -d when the image file does not store its resolution.

deda_compare_prints is part of DEDA, written by Timo Richter and Stephan Escher and described in their 2018 paper on forensic analysis and anonymisation of printed documents.

deda_parse_print(1), deda_extract_yd(1), deda_clean_document(1)

Source code