How to convert structure to variable seperately?

I want to same effect. Like this,

a1 = imread('2015_01_26_1.jpg);

a2 = imread('2015_01_26_2.jpg);

a3 = imread('2015_01_26_3.jpg);

a4 = imread('2015_01_26_4.jpg);

I try this.

a = dir('C:~~~~~\*.jpg');

for i = 1 : length(a)

    filename = strcat('C:~~~~\',a(i).name);

    I = imread(filename);

end

how can I get same result?? I want to variables.

[Jan]

The question is not clear.

[heo jaemu]

I have a structure like above image.

the structure is that load all jpg files in folder.

(so many files i have, so i want to read automatically.)

but, I can't use structure.

I want to variables.

and I want to answer like this,

 image(i) = ~~~

 for i = 1 : length(a)

~~~~
end

finally,

image(i) = ~~~~ % = imread('~~~.jpg'

image(2) = ~~~~