convert serial into parallel

while converting from serial to parallel , i encountered with some dependency variable related problems. the variables initiated outside the parfor loop cant use inside the loop. variables like row_counter, column_counter and r causing problem, am new to matlab so please help. my code is below !!!!

    myfile=dir('path\*.jpg'); % the folder inwhich ur images exists
myfile2=dir('path\*.jpg'); % the folder inwhich ur centroid  images exists
row_counter=1;
column_counter= 1;
r=0;
parfor i = 1 : length(myfile)
    filename = strcat('path:',myfile(i).name);
    img= imread(filename);
    k=datafilename;
    L1=load (k,'data'); % Making it a structure
    label=L1.data(:,5);
    for j=1: size(L1.data,1)
        C1 = image() 
        for h = 1 : length(myfile2) %%OPening the centroid Image

            filename2 = strcat('D:path\',myfile2(h).name);
            C2=imread(filename2);
            im_A=rgb2gray(C1);
            im_B=rgb2gray(C2);
             r(row_counter,column_counter)=corr2(im_A,im_B); 
            Parsave(r);
            column_counter=1+column_counter;

        end
        r(row_counter,column_counter)=L1.data(j,5);% Assigning label in the end
        row_counter=row_counter+1; 
        column_counter=1; % col counter reset
    end
end