How to Build Fingerprint Verification in ASP.NET Core Using Open-Source SourceAFIS

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A developer tutorial published on DEV Community explains how to implement 1:1 fingerprint verification in ASP.NET Core using SourceAFIS, a free open-source library. The guide covers the full pipeline: decoding an uploaded fingerprint image into raw grayscale pixels, extracting a minutiae-based template, comparing two templates to produce a similarity score, and applying a threshold to determine a match. The article distinguishes 1:1 verification — confirming a fingerprint matches a specific enrolled user — from the more complex 1:N identification problem of searching across an entire database. SourceAFIS handles the core matching mathematics, while the developer is responsible for setting the threshold and building the API plumbing. The tutorial uses SixLabors.ImageSharp for image decoding and wraps the logic in a minimal ASP.NET Core web API, noting that a production-grade system would require additional considerations beyond this basic implementation.

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