FAQ

FAQ

How do I add OpenCV to Android?

implementation("org.opencv:opencv:5.0.0.1")

Then OpenCVLoader.initLocal() once before use. See Quick Start.

Why is org.opencv.ml / SVM gone in 5.0?

It moved from core to the ml contrib module, which isn't in the official AAR. Same for Haar/HOG (xobjdetect) and G-API (gapi). See Migration OpenCV 5. Get them back with OpenCV Pro.

Why don't my Haar cascades work after upgrading?

Haar/HOG detection moved to xobjdetect (contrib) in 5.0 — not in the official AAR. Rebuild with contrib, or use OpenCV Pro.

Face detection vs face recognition?

Detection (find faces) works with the official AAR (DNN / objdetect). Recognition (identify who) needs the face contrib module → OpenCV Pro.

Do I really need to rebuild OpenCV for contrib?

Normally yes, and it's the most-reported OpenCV-on-Android headache (CMake, NDK toolchain, ABI mismatches). OpenCV Pro is a prebuilt AAR with core + all contrib, so you skip the rebuild.

Is this the official OpenCV?

No — the official free AAR is org.opencv:opencv on Maven Central (use it for core). OpenCV Pro by Jokobee is a separate prebuilt core + contrib AAR.

Contact

Jokobee · https://www.jokobee.com · contact@jokobee.com