CPG-PAD: Concept-Guided Presentation Attack Detection

Biometric authentication through facial recognition has become a cornerstone of digital security, but it is not without risks. Presentation attacks —such as printed photos, reused videos, or 3D masks— exploit the vulnerabilities of traditional systems. To protect these processes, the industry has developed detection mechanisms (PAD) that, however, face a critical challenge: generalizing across unseen environments, sensors, and attack materials. This is where artificial intelligence provides more robust solutions. Instead of memorizing specific patterns from each dataset, the most advanced models learn transferable visual concepts. An innovative approach involves using explainable AI (XAI) techniques to automatically discover image regions relevant to the attack, and then inject that knowledge into the learning space through concept-guided visual prompts. Thus, the system captures domain-invariant signals —such as textures or reflections typical of a mask— and avoids overfitting to particular camera or lighting artifacts. This abstraction capability is key to deploying solutions in real-world environments, where conditions constantly change. At Q2BSTUDIO, we understand that effective cybersecurity requires pentesting services and protection against advanced threats, but also a solid foundation in artificial intelligence. That is why we develop AI for businesses that integrates generalizable, explainable, and easy-to-audit models. Our teams combine custom applications with cloud platforms on AWS and Azure, ensuring scalability and low latency. Additionally, we implement AI agents that automate continuous monitoring tasks, while Business Intelligence solutions (such as Power BI) allow real-time visualization of detection system effectiveness. From custom software development to monitoring with business intelligence, we offer a complete ecosystem so your organization stays one step ahead of attackers. If you need to strengthen your biometric systems or explore new PAD capabilities, our team is ready to advise you.