A security system uses sensors, a camera and a microprocessor to capture images of each person entering a large shopping mall.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.

1. [1] naming a suitable sensor, e.g infra-red, pressure, motion sensors, send signal/data to microprocessor
2. [1] signal/data is converted to digital (using an ADC)
3. [1] microprocessor instructs/send signals to camera to capture image/video
4. [1] captured image/video data sent to microprocessor
5. [1] microprocessor compares the image/video with stored images/video...
6. [1] ...if person detected = stored image
7. [1] ...alert given to signal a person has been identified
8. [1] microprocessor compares the biometric data from an image/video with stored biometric data for images/video
9. [1] if biometric data matched = stored data
10. [1] alert given to signal a person has been identified
11. [1] Continual/repeated process
12. [1] number of photos = 12 × 60 × 24 = 17280
13. [1] memory requirement = 17280/1024 = 16.9 (16.875) / (17280/1000 = 17.28/17.3 is acceptable)
14. [1] (data transmission) is faster
15. [1] more secure/safer (because it is a dedicated line)
16. [1] (fibre optic transmission) is more reliable