Convert Android Bitmap to OpenCV Mat and backwards -

i wanted convert bitmap android mat object opencv. topic adressed on stack overflow. example:

convert mat bitmap opencv android ;

convert bitmap mat after capture image using android camera ;

templatematching mattobitmap opencv android

there more find. followed instrcutions in answers, i'm still unable done right way.

minimal code:

//first convert bitmap mat mat imagemat = new mat ( image.getheight(), image.getwidth(), cvtype.cv_8u, new scalar(4)); bitmap mybitmap32 = image.copy(bitmap.config.argb_8888, true); utils.bitmaptomat(mybitmap32, imagemat);  //do smth. imgproc.cvtcolor(imagemat, imagemat, imgproc.color_rgb2gray,4);  //then convert processed mat bitmap bitmap resultbitmap = bitmap.createbitmap(imagemat.cols(),  imagemat.rows(),bitmap.config.argb_8888);; utils.mattobitmap(imagemat, resultbitmap);  //set member result bitmap. member displayed in imageview mresult = resultbitmap; 

(note: image bitmap supplied lines of code)

errors:

08-07 15:13:59.188: e/androidruntime(2115): fatal exception: main

08-07 15:13:59.188: e/androidruntime(2115): java.lang.noclassdeffounderror: org.opencv.core.mat

but imports are:

import android.graphics.bitmap; import android.graphics.bitmap.config;   //opencv import org.opencv.android.utils; import org.opencv.core.cvtype; import org.opencv.core.mat; import org.opencv.core.scalar; import org.opencv.imgproc.imgproc; 

would appreciate sort of help. dans

you can work opencv after initialized. need initialize that:

1.create callback:

private baseloadercallback mopencvcallback = new baseloadercallback(this) {     @override     public void onmanagerconnected(int status) {         switch (status) {         case loadercallbackinterface.success:             //do work/stuff here              break;         default:             super.onmanagerconnected(status);             break;         }     } }; 

2.you need initialize callback in onresume method of activity:

@override     protected void onresume() {         super.onresume();         opencvloader.initasync(opencvloader.opencv_version_2_4_8, this,                 mopencvcallback);     } 

and thats it, hope helpful :d