java - NDK and OpenCV setup in Android Studio -


i imported module "opencv android" android studio , tried implement image processing features in java code.

most of opencv methods core.multiply , core.add work fine, however, found opencv methods mat.put() , mat.get() not quite efficient, , program run slow in device.

so, questions are,

  1. if set ndk in android studio, make program run faster? (i think program more efficient if use pointer in c++, not sure if correct)

  2. i use opencv methods mat.get() , mat.put() in way, 

     bitmap bitmap = bitmapfactory.decoderesource(this.getresources(), r.drawable.testphoto);     mat m1 = new mat(bitmap.getheight(), bitmap.getwidth(), cvtype.cv_8uc4);     mat m2 = m1.clone();     utils.bitmaptomat(bitmap, m1);     byte[] arr = new byte[(int)(m1.total() * m1.channels())];     m1.get(0,0,arr);     //some processing here...     m2.put(0,0,arr);

so, there more efficient way use mat.get() , mat.put()?

  1. if using ndk better way, how can set both opencv , ndk in android project? tried follow tutorial set ndk in android studio, once set ndk, not import opencv project.

to setup opencv , ndk, first import opencv library module in android project , add dependencies. can research how setup android ndk.

after getting image input through bitmapfactory , conveting mat, can process image in ndk, makes program run faster , efficient.


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