A security team wants an alert whenever a person enters a marked zone in a camera feed. Which capability should the solution use?
Show answer and explanation
Answer: A
The requirement is spatial: is a person inside this polygon at this moment? An object detector supplies person bounding boxes, and your application compares their coordinates with the zone geometry to raise an alert. Restricting analysis to a region of interest reduces false triggers from irrelevant areas. Whole-image classification cannot say where anything is, identification is unnecessary for anonymous intrusion, and OCR reads signs rather than people.
Why the other options are wrong
- B. Classification labels the frame as a whole and provides no location, so it cannot tell whether someone crossed the boundary.
- C. Identification establishes who a person is; entry detection does not require knowing identity and would fail for unenrolled people.
- D. OCR extracts text from signs and has no way to detect a person's position.
Exam tip. Zone alerts are built from detection coordinates plus your own polygon logic; spatial analysis itself was retired in March 2025.