Convert image to a c++ header file

Can someone tell me why can't I get this to work?! It should be working!

The script is as below;

function export_Img_2_Header( img, filename ) 
%EXPORT_IMG_2_HEADER Summary of this function goes here 
% Detailed explanation goes here 
sizeArray = numel(img); 
fileID = fopen(filename,'w'); 
fprintf(fileID,'//Image on header\n'); 
fprintf(fileID,'unsigned char img[%d] = {',sizeArray); 
img_sq = reshape(img,[1 sizeArray]); 
for idx = 1:numel(img_sq)
  val = img_sq(idx); 
  if idx ~= sizeArray
    fprintf(fileID,'%d ,',val); 
  else
    fprintf(fileID,'%d',val); 
  end 
end
fprintf(fileID,'};\n'); 
fclose(fileID);
end

[Jan]

Please mention, what "can't get it to work" means. The code looks fine, so I guess you made a mistake at calling it.

Answer 1

[Saipraveen]

In this file exchange - https://www.mathworks.com/matlabcentral/fileexchange/72535-image-to-c-c-array-converter, I have written a script to generate a C/C++ array which can be saved as a header file for use with various embedded displays.

Hope that helps.

Answer 2

[Jan]

Maybe this helps - smarter without a loop:

function export_Img_2_Header( img, filename ) 
% EXPORT_IMG_2_HEADER Create C++ header file containing image data
[fileID, msg] = fopen(filename, 'W'); 
if fileID == -1
    error('Cannot open file for writing: %s, %s', filename, msg);
end

% Maybe:
img = im2uint8(img);

n = numel(img);
fprintf(fileID, '// Image on header\nunsigned char img[%d] = {', n); 
fprintf(fileID,'%d ,', img(1:n-1));
fprintf(fileID,'%d};\n', img(n));
fclose(fileID);
end