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don't save it as mat file, you can save it as dat file and then do this:

in matlab:
fid=fopen('test.dat','w+');
fprintf(fid,'%d\n',currFrame_Cropped_Gray);
fclose(fid);

This will save you the dat file as a 1 column.

now in java:

private Mat ReadDemoFromFile()
{
    Mat tempmat =  new Mat(new Size(701, 701), CvType.CV_8U);
    InputStream in;
        try {
            in = new FileInputStream(Environment.getExternalStorageDirectory() + "/DCIM/Frames/test.dat");
            InputStreamReader is = new InputStreamReader(in);

            BufferedReader br = new BufferedReader(is);
            String read;
            for(int i = 0 ; i< 701; i++)
                for(int j = 0 ; j < 701 ; j++)
                {
                    try {
                        read = br.readLine();

                        tempmat.put(j, i, Integer.parseInt(read));
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

            return tempmat;
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }



    return tempmat;


}

Here I saved the data file in my device, if you want you can save the file in the RAW folder inside your project. This is an example of what I did, so change all the parameters and sizes as you wish.

don't save it as mat file, you can save it as dat file and then you can do this:

in matlab:
fid=fopen('test.dat','w+');
fprintf(fid,'%d\n',currFrame_Cropped_Gray);
fclose(fid);

This will save you the dat file as a 1 column.

now in java:

private Mat ReadDemoFromFile()
{
    Mat tempmat =  new Mat(new Size(701, 701), CvType.CV_8U);
    InputStream in;
        try {
            in = new FileInputStream(Environment.getExternalStorageDirectory() + "/DCIM/Frames/test.dat");
            InputStreamReader is = new InputStreamReader(in);

            BufferedReader br = new BufferedReader(is);
            String read;
            for(int i = 0 ; i< 701; i++)
                for(int j = 0 ; j < 701 ; j++)
                {
                    try {
                        read = br.readLine();

                        tempmat.put(j, i, Integer.parseInt(read));
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

            return tempmat;
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }



    return tempmat;


}

Here I saved the data file in my device, if you want you can save the file in the RAW folder inside your project. This is an example of what I did, so change all the parameters and sizes as you wish.

don't save it as mat file, you can save it the matrix as dat file you can do by doing this this:

in matlab:
fid=fopen('test.dat','w+');
fprintf(fid,'%d\n',currFrame_Cropped_Gray);
fclose(fid);

This will save your matrix as 1 column in a dat file, so after it you the dat file as a 1 column.can read in java line by line.

now in java:

private Mat ReadDemoFromFile()
{
    Mat tempmat =  new Mat(new Size(701, 701), CvType.CV_8U);
    InputStream in;
        try {
            in = new FileInputStream(Environment.getExternalStorageDirectory() + "/DCIM/Frames/test.dat");
            InputStreamReader is = new InputStreamReader(in);

            BufferedReader br = new BufferedReader(is);
            String read;
            for(int i = 0 ; i< 701; i++)
                for(int j = 0 ; j < 701 ; j++)
                {
                    try {
                        read = br.readLine();

                        tempmat.put(j, i, Integer.parseInt(read));
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }

            return tempmat;
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }



    return tempmat;


}

Here I saved the data file in my device, if you want you can save the file in the RAW folder inside your project. This is an example of what I did, so change all the parameters and sizes as you wish.