Completeness check of a value document

A system configured for checking the completeness and/or authenticity of value documents, wherein at least one value document comprises at least one machine-readable feature substance at at least two locations of the value document, the system comprising:

• a light source configured to apply an excitation energy to at least a local portion of the at least one value document;
• a detector device configured to capture a location-resolved feature intensity with respect to the at least one machine-readable feature substance at several different locations of the at least one value document;
• and
• a processing machine configured to:
• perform location-based classification of the captured location resolved feature intensities for each of the several different locations of the at least one value document using a threshold value;
• determine location-based limits of a location distribution to be expected of the at least one machine-readable feature substance relative to the at least one value document, said location-based limits being established from a location-based distribution of the classified feature intensities or from including further measurement values;
• and
• assess a location-based distribution of the classified feature intensities with respect to a relative position of pixels classified as below-threshold relative to the location-based limits of the location distribution to be expected of the machine-readable feature substance;
• wherein the location-based limits represent a longitudinal extension and/or a width extension of the at least one value document.