dct coefficient calculation

hello everybody i am doing small experiment on face reccognition , for that i need the following i want to find the dct of 10 images and and i need to find the dct of another one image(test image)and i want to find the difference between these 10 image and the test image dct coefficients , i tried but i could not, can anyone give me suggestion

[Ashish Uthama]

Muthu Kumar, you might a faster/helpful response if you posted what you tried and where specifically you did not get the answer you were hoping to get.

[muthu kumar]

thank u for ur suggestion

for example how to check the similiarity between 2 image dct coefficients