November 10, 2025

Multi-Level ID Scanning:
NFC Chip ↔ Face Image ↔ VIZ ↔ MRZ

For modern ID scanning systems, recognizing general information from the ID document’s visual inspection zone (VIZ) and the information encoded in the machine-readable zone (MRZ) is no longer sufficient. The need for stronger security, faster processing, and more reliable identity verification in both physical and digital environments dictates enabling other levels of identity verification. One of them is reading of the NFC chip, which is commonly used in biometric passports and other eIDs, already issued by more than 140 countries worldwide.

Moreover, today we are witnessing a large shift toward mobile platforms. This means that the latest anti-fraud systems widely used in banking, insurance, and telecom not only have to be highly effective but also run even on low-budget devices with limited computational resources. OCR Studio’s ID scanner meets both of these demands – below, we showcase it.

What Is Cross-Validation and How Is It Deployed in the OCR ID-scan?

Cross-validation in ID document recognition is a system that checks if the information displayed in VIZ matches the data encoded in the MRZ and NFC chip. In authentic documents this information duplicates fully, but in counterfeits there may be discrepancies. Cross-validation technology detects even single-digit differences and identifies such forgeries with high accuracy.

Let’s take a little more precise look at what each level of checks is aimed at:

• VIZ: all passport holder’s information that is printed and visually inspected. This includes the document holder’s photo, nationality, name, passport number, issuing state, sex, birth date, signature, etc.
• MRZ: two or three lines of characters (at the bottom of the document) that encode most of the information from the VIZ – document type, document number, holder’s full name, date of birth, etc. It may also contain «optional data», which varies by issuing authority.
• NFC chip: a small electronic component inside the ID document that stores corresponding data fields, including the document holder’s photo and the signature (held in data groups 1, 2, 7). The information on the chip is protected by a cryptographic signature, which assures that it was issued by the legitimate authority and has not been altered since production.

When OCR ID-scan performs cross-validation, it safely and instantly extracts data stored in VIZ, MRZ and NFC chip. Immediately after the extraction the algorithm conducts document integrity checks and verifies its authenticity by comparing the information across sources. Specifically, ID scanner compares:

• VIZ to MRZ: verifies if name, ID document number, issuing state, and other information is identical in both zones. If not, the system identifies the document as forged and tells exactly which data has been altered.
• MRZ to NFC chip: checks if the encoded information is the same. In some forgeries, the MRZ is altered to duplicate the VIZ – that’s why an NFC chip additional check is necessary.
• NFC chip to VIZ: reviews if the document holder’s image encrypted in the chip repeats the photo from the VIZ. This prevents scenarios when the photo used in the document was replaced, morphed or compromised, using AI-technologies.

OCR ID-scan is capable of reading any chip compliant with the ISO and ICAO standards. It supports 4 000+ document templates, including certain national identity cards, in 100+ languages from 250+ countries and territories.

For added assurance, the solution incorporates face images verification by comparing the document photo with a real-time selfie of the user, confirming that the document holder is genuinely present – this is the extra level of cross-validation. Technology enables remote customer service and defends against impersonation and fraudulent use of stolen credentials.

Is Cross-Validation Available on Mobile Phones?

Cross-validation technology along with other OCR ID-scan features is available on mobile phones, desktops, and tablets thanks to ultra-lightweight neural networks at its core. Furthermore, all data is processed entirely on the user’s device – which is crucial for protecting the users’ sensitive information. Nothing is transmitted to external servers, which guarantees regulatory compliance and preserves personal details from leakage. This is relevant for businesses that handle large volumes of identity data, such as banks, airlines, and government agencies.

Multi-Level ID scanning by OCR Studio

OCR Studio develops powerful, secure ID and passport scanning solutions that work under any conditions – even offline. Our advanced OCR technology instantly recognizes text in any document, works fully on-premise, and integrates seamlessly with your existing systems.

OCR Studio’s OCR ID-scan with cross-validation and NFC chip verification allows businesses to build a much stronger security arrangement. Find out more about the technology here.