how to find lowest vertical and horizontal DCT coefficient of an image block

I have an image of size 256x256 and it is divided into equal non overlapping blocks of size 8x8. I have to find the lowest vertical and horizontal DCT (Discrete Cosine Transform)coefficients of each image block. Is there any method available for this problem in MATLAB?

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The usual method is to create an array of indices that maps from the most important to the least important as you have stored them.

This is the pattern used in JPEG. What we don't know is how you have arranged your coefficients so we cannot give you the ordering.

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