Abstract: In some examples, a system receives a request for digital content that is responsive to a capture of an image of a mark, receives information relating to a captured image of a user, and in response to the request, identifies, from a plurality of different digital content items associated with the mark, a first digital content item, the first digital content item identified responsive to a characteristic of the user determined based on the captured image of the user, and the plurality of digital content items associated with respective different characteristics of users. The system communicates the identified first digital content item to output, by an output device, information based on the identified first digital content item.

Abstract: In an example, a capture system includes a content capture mechanism, an isolation engine, a mark strength engine, and a parameter controller. In that example, the isolation engine generates mark data, the mark strength engine identifies a first variance level in a first region of a first set of mark data, and the parameter controller adjusts a parameter of the content capture mechanism in accordance with a strength change based on a comparison of the first variance level to a second variance level in a first region of a second set of mark data.