the attached utility is a work I ve submitted to the universityIt shows what a jpeg compression is all about.the function implements the DCT transform, using a matrix operator.note that matlab has a function for the DCT and iDCT transforms that might be more efficient .

jpeg
....\0.tif
....\1.tif
....\2.tif
....\3.tif
....\4.tif
....\5.tif
....\6.tif
....\7.tif
....\8.tif
....\9.TIF
....\jpeg.m
....\readme.txt

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