MATLAB: How to read images stored in mat files using variables

.mat fileimages

I have a set of images stored in mat file. In the program I have a variable using which i need to the corresponding image file in mat.
For Example :
I = imread('1.jpg'); 
J = imread('2.jpg'); 
save imgs.mat
a = 'I';
imshow(a); --- this should get the image I from mat file displayed. But I am getting the error message 
Cannot find the specified file: "I"
How to do this ?

Best Answer

input_data = load('imgs.mat', a);
imshow(input_data.(a))
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