🚀 go-pugleaf

Thomas Kinsman (thomas@acadia.Kodak.COM) wrote:
:     There is no set terminology.  However, some terms you  will  find  in  the
:     literature which span the ideas you are talking about are:
:     A.  LOSSLESS COMPRESSION
:         This communicates that no  information  is  lost.   Categories  within
:         lossless  compression  describe  the  methods used to achieve lossless
:         compression.
:     B.  LOSSY COMPRESSION.
:         Of course, this communicates that the information content is reduced.

Ed Hall writes(message-ID: <3953@randvax.rand.org>
>One thing that is commonly forgotten is that /all/ digital coding of analog
>information is "lossy."  This includes both visual and audible information.
>It is a mistake to ignore the quantization step when considering the loss
>in a compression system. ...

Again... a good point! If you had looked through A.K.Jain's paper on 
Image Data compressioin: a review- He points out that it is quite remarkable 
to express a continuous infinite picture in a finite number of samples 
without visually noticeable loss of information- we inherently assume an 
ideally low pass filter! Remarkable! isn't it? So are we not, in truth, 
losing information right from where we sample then? Maybe thats why they 
call lossy coding when you deliberately throw away some information and 
yet get the reconstructed image with a reasonably good quality 


--Joseph.
provine@enel.ucalgary.ca