how to access first subimage from mat2cell when it is divided into 8x8 images?

suppose we have image which is split into 8x8 subimages by using mat2cell. now i have to access first subimage from this 8x8 cells. how to do this.suggest some code

[Birdman]

Can you share your code?

[ramya]

            a=VideoReader('test.mp4 ');
            b = read(a,1 );
            c=rgb2gray(b ); 
            nframe=a.NumberOfFrames ;
            for i=115
                prev_frame =read(a,i-1 ); 
                e=rgb2gray(prev_frame  ); 
                figure 
                imshow(e );  
                pause(0.2)
                current_frame =read(a,i); 
                h=rgb2gray(current_frame ); 
                figure 
                imshow(h);  
                rows = 8 ; 
                columns = 8 ; 
                [H,W,~] = size(c );
                szH = [repmat(fix(H/rows),1,rows )]; 
                szW = [repmat(fix(W/columns),1,columns )]; //to split into window size of 8x8 as per my algorithm
                C = mat2cell(e, szH, szW )'; 
                D = mat2cell(h, szH, szW )'; 
                figure
                for j=1:rows*columns 
                    subplot(rows,columns,j), imshow( C{j } ) //to plot above cells
                end  
                figure
                for j=1:rows*columns 
                    subplot(rows,columns,j), imshow( D{j } ) 
                end  
           end
here is the code now i have to access C{1},C{2} and so on to perform std on each subimage