matlab - creating database
i'm working on a project of image processing, i have an image and convert it like this:    

    a = imread ('4.jpg');  
    b = rgb2gray (a);  
    c = imadjust (b);  
    d = im2bw (c);  
    subplot (2,2,1), imshow (a),  
    subplot (2,2,2), imshow (b),  
    subplot (2,2,3), imshow (c),  
    subplot (2,2,4), imshow (d)  

the data of **a,b,c and d** show on the workspace. which data can i use for the database and how could i store the feature of that image into a database?
matlab - creating database
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i'm working on a project of image processing, i have an image and convert it like this:    

    a = imread ('4.jpg');  
    b = rgb2gray (a);  
    c = imadjust (b);  
    d = im2bw (c);  
    subplot (2,2,1), imshow (a),  
    subplot (2,2,2), imshow (b),  
    subplot (2,2,3), imshow (c),  
    subplot (2,2,4), imshow (d)  

the data of **a,b,c and d** show on the workspace. which data can i use for the database and how could i store the feature of that image into a database?