Face recognition attendance system for schools

What is a face recognition attendance system?

A face recognition attendance system marks students present by recognising their faces with a camera, instead of calling names, scanning fingerprints or tapping cards. Each student's face is enrolled once. After that, a camera pointed at the class finds each face, compares it with the enrolled faces and fills in the attendance register.

Calling the roll for a class of 40 eats into every lesson, and friends answer for each other. Fingerprint machines mean a queue and every child pressing the same sensor. Cards get forgotten or lent. A camera scan in the classroom avoids all three.

How does face recognition attendance work?

There are two stages, enrolment and the scan. In Premeena both run in the browser on the school's own phone, tablet or laptop.

1. Enrolment turns a face into numbers. The student looks at the camera, then turns their head in one slow circle, which takes about five seconds. The software captures five angles and turns each into a face signature: a list of 128 numbers that summarises what the face looks like. A short live test confirms it.
2. Only the numbers are saved. Camera frames are processed on the device and discarded. A signature is not an image, and the photo it came from is never stored.
3. The scan finds faces. When the teacher starts a scan, the device downloads the signatures for that one class. A face-detection model called YuNet finds every face in each video frame.
4. Each face is compared with the class. A face-recognition model called SFace turns each detected face into a 128-number signature and compares it with the class's enrolled signatures. A match must be close enough, and clearly closer than the next most similar student. A borderline match has to be seen twice.
5. The register is pre-filled, not finalised. Recognised students become Present and everyone else Absent, in a draft. Students already marked Late or Excused are left alone. The teacher fixes anything wrong, then saves or finalises.

Matching against one class of a few dozen students, not the whole school, keeps it fast enough for a moving camera.

Key features

Setting up face attendance in Premeena

Once per student: register Face ID

1. Open Front Desk → Face ID and find the student by name or ID, or scan the QR code on their ID card.
2. Tick the consent box: the student agrees, or a parent or guardian agrees on the student's behalf.
3. Start the face scan: one look at the camera, then one slow head circle. Even light and no cap, mask or sunglasses work best.
4. Pass the live test. The student now shows as Enrolled.

Whenever you take the register: scan the class

1. Open the class's attendance page and pick the date. The Scan the class card shows coverage, for example 32 of 40 students have Face ID.
2. Tap Start scan and pan slowly. A dashed amber outline means a face is too far away, so step closer.
3. Tap Mark N present · others absent to return to the register.
4. Check it, mark students without Face ID by hand, then save a draft or Finalise. Finalising sends absence alerts to guardians.

Anyone who can mark the register can scan it: class and subject teachers, a substitute on the day they cover, and owners or managers. See the face attendance help article, or attendance management for the registers the scan feeds.

Privacy and consent

What is stored

• Up to five face signatures per student (128 numbers each), the model version and a quality score.
• Who gave consent (the student, or a parent or guardian), when, and which staff member did the enrolment.

What isn't stored

• No photos and no video, at enrolment or during a scan.
• No face signatures in the audit log or the register, which only records Present or Absent.

Who can see or use it

• Enrolling or deleting faces needs the Face ID permission, which owners and managers have by default. It is flagged as sensitive in positions and permissions so it isn't granted by accident.
• A class's signatures go only to the device of someone who can mark that class's register.
• Every enrolment, re-enrolment and deletion appears in the audit trail.

Consent and the law

Face ID is optional for every student. Premeena records whether consent came from the student or a guardian, but the school is responsible for obtaining it. In India, the Digital Personal Data Protection Act, 2023 treats anyone under 18 as a child and requires verifiable consent from a parent or lawful guardian before a child's personal data is processed, so collect written parental consent before enrolling students. Other countries have similar rules; schools in England, for example, need a parent's consent to use a child's biometric data. Premeena doesn't certify legal compliance, so check the rules that apply to you.

Paper register vs fingerprint device vs RFID card vs camera scan

A general comparison. Costs vary by vendor, so it shows trade-offs, not prices.

Accuracy and limits

Face recognition is good, not perfect, so the teacher stays in charge. Plan for these limits:

• Light. Even light on faces works best. Don't point the camera into a bright window.
• Visibility. Caps, masks, hands or a raised book can hide a face. Ask the class to look up.
• Distance. Back rows look small to the camera. If outlines stay amber, walk a few steps toward the back.
• Speed. Pan slowly; each face needs about a second in view.
• Missed faces stay Absent in the draft until the teacher changes them.
• Only the class is matched. A visitor or a student from another class isn't in that class's list, and the scanner stops trying after a few attempts on an unknown face.
• Finalised means locked. Reopen a finalised register before scanning it again.
• Daily registers only. Classes on period-wise attendance mode, and elective groups, are marked by hand.

Who uses it

What Premeena doesn't do (yet)

Frequently asked questions