Which display systems consist of a small video camera mounted vertically over a tabletop platform?

The correct answer pertains to visual presenters, commonly known as document cameras. These devices utilize a small video camera positioned vertically above a surface, such as a tabletop platform, to capture and project images of documents, objects, or other materials to an audience. This setup allows for real-time viewing and interaction, making it an effective tool for presentations in educational and training environments.

Visual presenters enable instructors to showcase details clearly, enhancing engagement and understanding among learners. Unlike other systems, such as video conferencing, which primarily connects participants for communication, or interactive displays and closed-circuit television, visual presenters focus specifically on displaying physical materials in a live context. This unique function sets visual presenters apart as an essential resource for hands-on teaching and demonstrations.