Facial payment systems allow customers to authorise transactions by simply looking at a camera. The technology relies on fast, accurate face recognition, which in turn depends on the camera module. Unlike a standard webcam, a facial payment terminal must work in a wide range of lighting conditions, capture fine facial features, and often include anti‑spoofing (liveness detection). In this article, we explore the camera modules used in these systems, from compact embedded sensors to custom OEM camera module designs.
1. CMOS Camera Module – The Core Sensor
Almost every facial payment terminal uses a cmos camera module. CMOS sensors offer low power consumption, fast readout, and good image quality at a reasonable cost. For facial recognition, the sensor needs at least 2 MP (1080p) resolution, and often 5 MP or more to capture detailed features such as eye corners and skin texture. Global shutter sensors are preferred because they eliminate motion blur when the user moves their head slightly.
Popular sensors include Sony IMX290 (2 MP, excellent low‑light) and IMX415 (8 MP, 4K). These are integrated into a mini camera module that fits behind the terminal's display.
2. USB Camera Module (UVC) for PC‑Based Systems
Some facial payment systems are built on a standard PC or tablet running the recognition software. For these, a USB Camera Module with UVC compliance is the easiest choice. Plug‑and‑play UVC camera module works immediately on Windows, Linux, or Android without custom drivers. The terminal developer can then use standard webcam APIs (OpenCV, MediaPipe) to capture frames.
However, USB introduces a small amount of latency and consumes more power than an embedded interface. For high‑volume payment terminals, an embedded solution is usually preferred.
3. OEM Camera Module – Customised for Payment Terminals
Most dedicated facial payment terminals are not designed with off‑the‑shelf webcams. Instead, they use an OEM camera module that is tailored to the product's mechanical, optical, and security requirements. An OEM camera module allows the manufacturer to:
Choose a specific lens (field of view, aperture, focus distance) suited for the typical user distance (30‑80 cm).
Integrate an infrared (IR) filter for liveness detection – often with a separate IR camera and illuminator.
Embed the camera on a small PCB that fits inside the terminal's slim enclosure.
Ensure long‑term availability and consistent image quality across thousands of units.
For example, a payment terminal might include two OEM camera modules: one visible‑light camera for face matching and one IR camera for detecting spoofing (e.g., printed photos or masks).
4. Mini Camera Module for Space‑Constrained Designs
Modern payment terminals are compact and often have a screen‑to‑body ratio similar to a smartphone. A mini camera module (often 5 mm × 5 mm or smaller) can be placed above the display without creating a large notch. These miniature modules use wafer‑level optics and COB assembly to achieve a tiny footprint. While they share the same CMOS sensor technology, the lens is usually fixed‑focus and optimised for distances between 40 cm and 1 m.
Although a mini camera module is also used in endoscope camera module for medical applications, the payment version does not need waterproofing or sterilisation, but it does need consistent colour reproduction and good dynamic range (backlit scenes).
5. UVC Camera Module for Prototyping and Low‑Volume Systems
For small‑scale deployments or for testing facial recognition algorithms, a UVC camera module is ideal. Developers can buy a high‑quality USB camera (e.g., a 1080p module with global shutter) and connect it to a Raspberry Pi or an industrial PC. The UVC standard ensures that the camera is recognised as a video device, and the developer can focus on the recognition software. Once the design matures, they can migrate to an OEM camera module for mass production.
Key Requirements for Facial Payment Cameras
| Requirement | Why It Matters |
|---|---|
| High resolution (2‑8 MP) | Captures fine facial features for accurate matching. |
| Good low‑light performance | Works in dimly lit stores or outdoor kiosks. |
| Wide dynamic range (WDR) | Handles backlight from windows or bright displays. |
| Global shutter (preferred) | Avoids motion blur from slight head movements. |
| IR camera + illuminator | For liveness detection (anti‑spoofing). |
| Fixed focus at 40‑100 cm | User stands at a natural distance from the terminal. |
| Compact size | Fits into slim payment terminal housing. |
How Endoscope Camera Modules Relate
An endoscope camera module is designed for medical inspection inside the body – very small diameter, flexible, waterproof. While a facial payment terminal does not use an endoscope module, the miniaturisation techniques (chip‑on‑board, tiny lenses) are similar. Both fields benefit from advances in cmos camera module technology, such as back‑illuminated sensors and low‑power operation.
Conclusion
Facial payment systems rely on specialised camera modules that balance image quality, speed, size, and security. The most common choices are:
cmos camera module – The underlying sensor technology for all modern cameras.
OEM camera module – Custom‑designed for the terminal's optics, size, and liveness requirements.
mini camera module – For space‑constrained terminals without sacrificing quality.
USB Camera Module / UVC camera module – Used in prototyping, low‑volume systems, and development.
While an endoscope camera module is not directly used in payment terminals, the same CMOS technology and miniaturisation principles apply. When selecting a camera for a facial payment system, prioritise resolution, low‑light performance, global shutter, and IR capability for anti‑spoofing. For high‑volume production, an OEM camera module is the best investment.
If you need a custom OEM camera module for a facial payment terminal or any other computer vision application, contact Sincere. We design and manufacture cmos camera module based solutions tailored to your exact requirements.
