android/opencv - load cascade files from app folder in NDK

Question

I'm writing an android app which does face detection in native code using OpenCV. Right now, I save lbpcascade_frontalface.xml in SD card and load it in NDK/C++ as below.

CascadeClassifier fc.load("absolute path to sd card/Downloads/lbpcascade_frontalface.xml");

However, I want to save it in the app package, may be in assets/res folder. Does anyone know how can I load it in C++/NDK? Rather how can i get the absolute path to this file if I need to save it somewhere in the app package itself?

Answer 1

opencv can't read from zip files directly.

so if you put the cascade into your apk, you'll have to load it and save it again to internal/external storage, like in the facedetect sample