to make 5 image to be an unit using histogram

Can help me?

How do I take 5 grayscale images, which have the different size/dimensions, be an unit using histogram?

My image grayscale:

for i = 1:5
  citra1{i} = imread(['D:imageGray\' num2str(i) '.jpg']);
end

thank you for help.

[Image Analyst]

Please explain better. What does the histogram have to do with anything? What is "an unit"? Do you mean a single variable, such as a cell array? If so, then what is wrong with the way you did it?

[Walter Roberson]

Do you mean that you want to use the images as what is drawn for the histogram instead of bars? The way sometimes magazines illustrate using (for example) stacks of '$' signs?

$
$     $
$  $  $
$  $  $

[Dian Permatasari]

yes, i mean is 5 grayscale images into a single variable. My code:

for i = 1:5
  citra1{i} = imread(['D:imageGray\' num2str(i) '.jpg']);
end
%for single variable
  OneCitra=([citra3{1} citra3{2} citra3{3} citra3{4} citra3{5}]); 
%2D to vektor
  foo = reshape((OneCitra),1,numel(OneCitra));

    numberOfBins = 256;
    foobar = double(foo);
    r = hist(foobar,numberOfBins);
    plot(r);
save data_r r;
save(fullfile(pwd, 'data_r r'));

and error:

??? Error using ==> horzcat CAT arguments dimensions are not consistent.

Error in ==> ekstrasi_ciri_histo>axes47_CreateFcn at 312

OneCitra=([citra1{1} citra1{2} citra1{3} citra1{4} citra1{5}]);

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> ekstrasi_ciri_histo at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)ekstrasi_ciri_histo('axes47_CreateFcn',hObject,eventdata,guidata(hObject))

??? Error using ==> struct2handle Error while evaluating axes CreateFcn

if I find a histogram with the code as it is true? because when the dimensions of the image is the same, the code runs fine.

[Image Analyst]

That's not the error for that code. Your code is:

OneCitra=([citra3{1} citra3{2} citra3{3} citra3{4} citra3{5}]);

but the error refers to a citra1, not citra3:

OneCitra=([citra1{1} citra1{2} citra1{3} citra1{4} citra1{5}]);

You have to make sure that when you give an error message you give the actual code that generated the error message.

[Dian Permatasari]

i'm sorry IA. i mean:

for i = 1:5
    citra1{i} = imread(['D:imageGray\' num2str(i) '.jpg']);
  end
  %for single variable
    OneCitra=([citra1{1} citra1{2} citra1{3} citra1{4} citra1{5}]); 
  %2D to vektor
    foo = reshape((OneCitra),1,numel(OneCitra));

      numberOfBins = 256;
      foobar = double(foo);
      r = hist(foobar,numberOfBins);
      plot(r);
  save data_r r;
  save(fullfile(pwd, 'data_r r'));

Answer 1

[Walter Roberson]

You cannot construct your OneCitra the way you do if the images do not all have the same number of rows, or do not all have the same third dimension. (Different number of columns would be okay.)

Fortunately you do not need to construct OneCitra. Comment it out and instead use

foo = [citra1{1}(:); citra1{2}(:); citra1{3}(:); citra1{4}(:); citra1{5}(:)];

Note: the code you show does not match your error message. The code you show initializes citra1 but then uses citra3, but your error message uses citra1 as is probably proper.

[Dian Permatasari]

i'm sorry. i make mistake on copy - paste. and thank you WR. can you explain me about this?

[citra1{1}(:); citra1{2}(:); citra1{3}(:); citra1{4}(:); citra1{5}(:)]

[Walter Roberson]

citra1{1} is your first image. (:) after that reshapes that image to a single column vector. citra1{2} is your second image, the (:) after it reshapes that second image to a single column vector; the ";" between the two parts means to use horizontal concatenation, which would produce a single column vector from the original two.

[Dian Permatasari]

thank you, i understand now. your code running my program.

Answer 2

[Image Analyst]

The problem is that when you do something like

OneCitra=([citra3{1} citra3{2} citra3{3} citra3{4} citra3{5}]);

you have to make sure that the array inside citra3(1) has the same number of rows as the arrays inside all the other cells. Evidently your images have different sizes. When you use braces like citra3{1}, it means the "contents" of the cell, in other words, the actual array itself contained in the first cell of citra3. If you use parentheses, citra3(1), it means the first cell itself, not the contents of the cell. So citra3(1) is a cell, and citra3{1} is a 2D uint8 matrix (not a cell).