The earliest pre 2000 JPG specification included compression based on FFT and Fourier theory - using long (infinite) additive waveforms to match image features and then knocking off least terms to compress with some sense of "least" loss.
Using traditional FFT long waveforms introduced particular kinds of artifacts.
The 2000 JPG spec included the use of localised cosine wavelets .. just like trad. FFT (kind of) but scaled from one at origin to zero at a local radius to suppress the echoing artifacts.
The notion first (IIRC) appeared in the "infinitely scrollable" and "instantly loading" (at top level .. with infill as time passed) not-JPEG earth scale mapping images used by both LizardTech (DejaVu(?)) and ERMapper (ECW images) in the early 1990s.
The "google map style" applications kind of died on the vine for a bit after a series of dragged out patent arguments then came back in modified form.
Using traditional FFT long waveforms introduced particular kinds of artifacts.
The 2000 JPG spec included the use of localised cosine wavelets .. just like trad. FFT (kind of) but scaled from one at origin to zero at a local radius to suppress the echoing artifacts.
The notion first (IIRC) appeared in the "infinitely scrollable" and "instantly loading" (at top level .. with infill as time passed) not-JPEG earth scale mapping images used by both LizardTech (DejaVu(?)) and ERMapper (ECW images) in the early 1990s.
The "google map style" applications kind of died on the vine for a bit after a series of dragged out patent arguments then came back in modified form.
https://en.wikipedia.org/wiki/LizardTech,_Inc._v._Earth_Reso....