How can I concatenate multiple histograms in a for loop into 1 histogram using matlab

I am new to MATLAB. I have calculated 25 histograms using imhist function, which are created from subdividing the image into 25 blocks (1block=1histogram) using for loop. How can I concatenate these histograms on the same graph to make one histogram where for instance, the histogram for the first block stretches on the x axis from 0 to 255, the histogram for the second block stretches from 256 to 511, and so on until the 25th block. How can I do this?

I had found a solution like this https://stackoverflow.com/questions/30951480/how-to-concatenate-3-histograms-on-the-same-graph-in-matlab but my problem is I calculated all 25 histograms using for loop and I don't know what variable should I pass so that I can concatenate all histograms in 1 long histogram as I want it to be.

This is what I had done:

%declare variable
B=12; %B represent the block size
overlapp=3; %overlapping block is slid by 3 pixels along the image 
nob=0; %no of blocks

%get input from grayscale image
gray_path = 'D:\gray_image_folder\*.png';
total_gray_images=dir(gray_path);

for noOfGRAYimage = 1:length(total_gray_images)
% Specify images names with full path and extension    
    grayfilename=strcat('D:\gray_image_folder\', total_gray_images(noOfGRAYimage).name);
    grayImage = imread(grayfilename);% Read gray images 
    [r, c, p]=size(grayImage);

      for i=1:overlapp:(r-B)+1; 
  %         fprintf('i = %d\n', i);
  %         numberofblock = sprintf('%s_%d','block',nob)
          for j=1:overlapp:(c-B)+1;
  %             fprintf('j = %d\n', j);
              nob=nob+1;
              fy_mad(nob).block=grayImage(i:i+B-1,j:j+B-1); %partition (12x12) of blocks
              fy_mad(nob).position=[i j]; 
              fy_mad(nob).index=nob; 

              [rb, cb]=size(fy_mad(nob).block); %[12,12]
              localBinaryPatternImage = fy_mad(nob).block;
              %call function LBP
              LBP_centre = LBP (localBinaryPatternImage);
              figure;imhist(uint8(LBP_centre)) %histogram for each block

             % How to concatenate all histograms?
             %////
          end
      end
  end

[fy_mad]

I got the answer already. Should I post it here since nobody is answering me?

[Balaji M. Sontakke]

dear fy_mad please post the answer, i also have this problem

[jasmine htwe]

fy_mad I read your answer from this link https://stackoverflow.com/questions/45656214/how-can-i-concatenate-multiple-histograms-in-a-for-loop-into-1-histogram-using-m .

But, I am not sure which allBinLocs do you use in code?

allBinLocs = [allBinLocs; binLocs(:) + length(allBinLocs)];

Or

allBinLocs = (0:256*numBlocks-1)

And the other question is "stem is same with histogram value or not"?

I am also trying to concatenate histograms.

[fy_mad]

I used the first one.

Answer 1

[Image Analyst]

See my attached local binary image program.