How to create a database for image retrieval system

hi,

i'm new in image processing and matlab, i would like to know how can'i store the features ( such: color hist, color moments.....) that i extracted from an image, in a database. and which database is the most suitable in the case of image retrieval.

Thanks.

Answer 1

[Image Analyst]

Using a mat file is probably the most convenient for a small single user project, like something for your thesis or dissertation. You can use save() and load(). There is a database toolbox if you need something more professional to talk to things like Oracle databases: http://www.mathworks.com/products/database/

[rama farfoufa]

Thank you for the reply,

but how can'i use mat file, and where can'i foud it! please help me.

[Image Analyst]

Did you look up the help for the load() and save() functions I referred you to?

[rama farfoufa]

but sorry;

so, to use the mat file, i' must create a file that have an extension "NameofFile.mat", then for example if i calculate the histogram for an image, i will save the value in the mat file that i create it. (is that what i should do!)

[Image Analyst]

Yes.

% To save:
save('d:\folder\nameOfFile.mat', 'myHistogram', 'someOtherVariable');

% To recall:
storedStructure = load('d:\folder\nameOfFile.mat');
% Extract the variables from the structure into separate
% variables just for convenience.
myHistogram = storedStructure.myHistogram;
someOtherVariable = storedStructure.someOtherVariable;

[rama farfoufa]

thank you again, i create the .mat file now. but how can' i create a multi-dimension array, that contain the image path for example and the histogram value and how can' i see this value . such the code below.

[File, Folder] = uigetfile('*.*', 'MultiSelect', 'on');
handles.img = cell(1, length(File));
for K = 1:length(File)
  filename = strcat(Folder, File{K});
  I = imread(filename);
  IGray = rgb2gray(I);
  H = hist(IGray(:), 32);  %32 bins in the histogram
  imgs(K).image = I;
  imgs(K).histogram = H;
end
save('ImgDatabase.mat', 'H');

[Image Analyst]

Every time you loop over an new image, you're overwriting H. So your save() has only the H from the last image. You might make H an array H(K).

[rama farfoufa]

can' i contact you in private! (for example: Skype, email.. ) because i have a lot questions that i would like to ask you.

[Image Analyst]

You can click here to communicate privately with me or other MATLAB programmers.

[rama farfoufa]

thank you,

how can' i create cells for the mat file, and store the hist value in this cells.

[Image Analyst]

A mat file doesn't really have cells , like Excel has cells or a MATLAB cell array has cells. Just consider it a binary file with proprietary format that you can use to save or recall variables, using code I already showed you.

[Walter Roberson]

$5 ? That's inexpensive. I wouldn't get out of bed for $5.