i am writing the matlab code for bi-histogram equalization for the color image...i am using the 'function' to extend to all three planes i.e, RG&B ...but i am getting error 'Function definitions are not permitted in this context.'.

Question

vishwas h s 2014-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/114788-i-am-writing-the-matlab-code-for-bi-histogram-equalization-for-the-color-image-i-am-using-the-fun

评论： CSE 2014-3-26

clc;
 close all;
 clear all;
   function y = BBHE(x);
   sz = size(x);
   o_mean = round(mean(x(:)));
                                                                                 % HISTOGRAM
   h_l = zeros(256,1);
   h_u = zeros(256,1);
   for i = 1:sz(1)
       for j = 1:sz(2)
           g_val = x(i,j);
            if(g_val<=o_mean)
             h_l(g_val+1) = h_l(g_val+1) + 1;
           else
              h_u(g_val+1) = h_u(g_val+1) + 1;
           end
       end
   end
   disp(h_l)
   disp(h_u)
nh_l = zeros(256,1);
nh_u = zeros(256,1);
                                                                                % NORMALIZED HISTOGRAM OR PDF
   nh_l = h_l/sum(h_l);
   nh_u = h_u/sum(h_u);
% % CDF
   hist_l_cdf = double(zeros(256,1));
   hist_u_cdf = double(zeros(256,1));
   hist_l_cdf(1) = nh_l(1);
   hist_u_cdf(1) = nh_u(1);
   for k = 2:256
       hist_l_cdf(k) =  hist_l_cdf(k-1) + nh_l(k);
       hist_u_cdf(k) =  hist_u_cdf(k-1) + nh_u(k);
   end
                                                                                  % IMAGE REMAPPING 
   equalized_img = zeros(sz);
   range_l = [0 o_mean];
   range_u = [(o_mean+1) 255];
   for i =1:sz(1)
       for j =1:sz(2)
           g_val = x(i,j);
           if(g_val<=o_mean)
              equalized_img(i,j) = range_l(1) + round(((range_l(2)-range_l(1))*hist_l_cdf(g_val+1))); 
           else
              equalized_img(i,j) = range_u(1) + round(((range_u(2)-range_u(1))*hist_u_cdf(g_val+1))); 
           end
      end
   end
the above code is in one .m file  and following code is in another .m file 
a = imread('C:\Users\Public\Pictures\Sample Pictures\imageo1.jpg');
x = a(:,:,1);
y = BBHE(x);
figure,imshow(y);

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CSE 2014-3-26

please help me if you have run this code on color images..my code is not working on color images.please send me suggestion for code on manjeetg9@gmail.com.

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Answer 1

Image Analyst 2014-2-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/114788-i-am-writing-the-matlab-code-for-bi-histogram-equalization-for-the-color-image-i-am-using-the-fun#answer_123306

在 MATLAB Online 中打开

Get rid of the

clc;
 close all;
 clear all;

and get rid of the semicolon after

function y = BBHE(x);

replace y with equalized_img:

function equalized_img = BBHE(x)

and it should work fine. I did (with a standard color demo image) and it worked fine.

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vishwas h s 2014-2-5

thanks for the solution sir....but now i am getting a new kind of error saying that "Output argument "equalized_image" (and maybe others) not assigned during call to "C:\Users\vishwas\Documents\MATLAB\BBHE.m>BBHE".