How to convert cell operations into C++

Hello

I am not getting how to convert the cell operations in this code to C++. Please anyone get me the solution for this problem. Thank you.

clc
clear all;
close all;
%#codegen
% Reading target image and secret image
x=imread('C:\Users\DEEPAK\Desktop\project\code\final project code\B.bmp');
l=1;
[m n o]=size(x);
  % Creating secret image tiles for R G B Color Channels
for k=1:3
for i=1:4:m
    for j=1:4:n
        x1{k,l}=x(i:i+3,j:j+3,k);% secret images tiles in an array
        y1(k,l)=mean2(x1{k,l});
     l=l+1;           
    end
end
l=1;
end

Regards Deepak

[Geoff Hayes]

Deepak - why are you using a cell array for x1? Why can't you just use a multidimensional matrix to store this data (is it even necessary to store this data)? As an aside, if m is the number of rows of x and i iterates from 1 to m in steps of four, could you not have a problem for the case where i is identical to m and you try to access

 x(m:m+3,...)

because m+3 is exceeds the (row) dimension of the array?

Answer 1

[Walter Roberson]

malloc() a pointer to a data area large enough to store the required information. Copy the data into the resulting array. Store the pointer in the appropriate element of x1.

In C you must decide whether you are going to store the sub-arrays as rectangular blocks, or if instead you are going to store them as a vector of pointers to row vectors. The vector of pointers is easier to find examples of; see http://c-faq.com/aryptr/dynmuldimary.html, but rectangular blocks is more memory efficient and is the way that MATLAB handles it.

Side note: you will have a difficult time finding code to replace imread()