You have a security system that analyzes images from CCTV to provide authorized staff entry into restricted area. Which type of computer vision does the system use?

Optical character recognition (OCR) is used to extract text from images, which is not the primary function for granting access based on a person's identity.

Semantic segmentation assigns a class label to each pixel in an image (e.g., "person," "door"), but it does not identify specific individuals for access control.

To provide authorized staff entry into a restricted area based on CCTV images, the system must first locate human faces (facial detection) and then verify their identity against a database of authorized personnel (facial recognition). This combination is essential for access control.

Image analysis is a broad term that encompasses many computer vision tasks, but "facial detection and facial recognition" is the specific and most accurate description for identifying individuals for access control.