The algorithm to perform discrete cosine transform is
break image into 8*8 block of pixels
from left to right top to bottom subtract 128 from each block of pixels
apply dct to each block
the algorithm continues however I have a few questions
1)how to break the image into 8*8 block of pixels.What is the meaning of this statement and how should i proceed about doing it?
2)subtract 128 from what value?
3)how to apply dct?