What key function does a camera's interface serve regarding pixel density?

The key function of a camera's interface in relation to pixel density is primarily centered around adjusting resolution settings. The interface allows users to set and modify the camera’s resolution, which directly influences pixel density. Higher resolutions result in greater pixel density, enhancing image clarity and detail, particularly important in surveillance applications where identifying faces or license plates may be necessary.

While verifying installation requirements, providing user tutorials, and displaying real-time data are important functions of a camera's interface, they do not explicitly relate to pixel density adjustments. The ability to modify resolution through the interface ensures that users can optimize image quality according to specific requirements, such as the environment where the camera is deployed, the expected level of detail, and storage capabilities.