Re: Ping: dawn, some mvl questions

David Cressey wrote:

"Keith H Duggar" <duggar@xxxxxxxxxxxx> wrote in message
news:1148249698.686154.221010@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

dawn wrote:

information never verbalized

(though "verbalized" seems a poor choice of words perhaps
for "modeled" or "represented"?)

Your over all response seems to me to assume that if data is lost,
information is lost.

Noise is information. I am reminded of an article I read long ago. I think it was perhaps one of the first Byte magazines I read--back when the magazine was good and stuff.

The article explained some aspects of image processing. How NASA found it necessary to invent image processing to 'sell' the photographic and video results they got back from various space missions etc.

The article showed the effects of a median filter to remove thermal noise. The 'before' image showed a very snowy picture of some white flowers on a dark background. The 'after' image clearly showed highly detailed pictures of some trilliums growing in a forest near a log. One could see the texture of the log, the leaves of the surrounding trees and details in the petals.

The article made the point that the 'after' image had less information than the original. If you remove more noise than signal, the signal to noise ratio improves. But the result has less information.

Had the picture shown mayflies and blackflies instead of thermal noise, the clear image would remove all information about the insects.

Since data is information encoded for automated processing, a loss of data is a loss of information. However, not all information is equally valuable.


I would contend that there are sitations where data
can be discarded without losibg information, provided its information about
some specific context.

Your contention would be false. Had you contended, instead, that there are situations where one can lose information without losing anything of value, your contention would have been true.
.

Relevant Pages

  • Re: BT line rerouted?
    ... exchange is a source of interference and noise. ... with cable length as does attenuation. ... much interference to other users as they do to you. ... Yes, technically that's contention. ...
    (uk.telecom.broadband)
  • Please Help Me find SNR!
    ... Now I do work about image processing. ... and my work now have to find SNR value when the picture have noise. ... In this case I use ' cameraman.tif ' and noise is Jpeg noise value of quality 100-1 ... I have to find SNR value in each noise. ...
    (comp.soft-sys.matlab)
  • Re: Vinyl to Digital
    ... and was the noise of the core changing shape each time ... Maybe they should issue free earplugs to ... lower frequency, and each line scan was triggered by the broadcast line ... This meant that if there was no picture signal, ...
    (uk.comp.sys.mac)
  • Re: Use of high definition mini DV tape
    ... Block noise, shimmering, banding, etc. ... the DVD and ultra-cheap miniDV SF camcorder. ... picture quality worse than HDV. ...
    (rec.video.desktop)
  • Re: Power Conditioners Worth the Money?
    ... sales guy said it would improve audio and video quality. ... Do you have a lot of noise on the picture? ... there are few true power conditioners on the market today. ...
    (alt.tv.tech.hdtv)