I want to know the answer to the following question:
What does a DCT do?
All the background I'm provided with is that "Other methods, such as fractal compression, matching pursuit and the use of a discrete wavelet transform (DWT) have been the subject of some research, but are typically not used in practical products (except for the use of wavelet coding as still-image coders without motion compensation).". Is that enough to answer the question?
Answer: no