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What's a "Rippling xOr?" - Mac Programming

Hi, I just came across the description of an image compression algorithm, and it mentions a "rippling xOr". I know what an xOr is, but what would a "rippling" one be? Any clues would be appreciated. Cheers, -- M. Uli Kusterer http://www.zathras.de...

  1. #1

    Default What's a "Rippling xOr?"

    Hi,

    I just came across the description of an image compression algorithm,
    and it mentions a "rippling xOr". I know what an xOr is, but what would
    a "rippling" one be?

    Any clues would be appreciated.

    Cheers,
    -- M. Uli Kusterer
    http://www.zathras.de
    Uli Guest

  2. #2

    Default Re: What's a "Rippling xOr?"

    In article <t-online.com>,
    Uli Kusterer <de> wrote:
     

    its not a specific operator, i would guess, but a species of
    algorithm--probably one which applies the xOr multiple times
    successively on adjacent areas of the image

    (total shot in the dark :)

    --
    |\/| /| |2 |<
    mehaase(at)sas(dot)upenn(dot)edu
    Mark Guest

  3. #3

    Default Re: What's a "Rippling xOr?"

    In article <upenn.edu>,
    Mark Haase <net> wrote:
     

    Thanks,

    that was my guess as well, though it doesn't help much :-( I had hoped
    there was some more detailed definition of this somewhere...

    Cheers,
    -- Uli
    Uli Guest

  4. #4

    Default Re: What's a "Rippling xOr?"

    In article <t-online.com>, Uli
    Kusterer <de> wrote:
     
    >
    > Thanks,
    >
    > that was my guess as well, though it doesn't help much :-( I had hoped
    > there was some more detailed definition of this somewhere...[/ref]

    Here's my guess:

    (((A xor B) xor C) xor D)...

    --
    Jack
    Jack Guest

  5. #5

    Default Re: What's a "Rippling xOr?"

    In article <241020031323257095%spam>,
    Jack B <spam> wrote:
     

    Thanks,

    how would one 'decompress' images 'compressed' that way?

    -- Uli
    Uli Guest

  6. #6

    Default Re: What's a "Rippling xOr?"

    In article <t-online.com>, Uli
    Kusterer <de> wrote:
     
    >
    > Thanks,
    >
    > how would one 'decompress' images 'compressed' that way?[/ref]

    I have no idea. And, by itself, it surely doesn't compress.

    I only mentioned it because in the past I've applied the "rippling"
    term to various primitive encoding/encryption techniques. Like:

    for (i = 0, seed = starter; i <= max; i++)
    seed = image[i] ^= seed;

    Wish I could help more.

    --
    Jack
    Jack Guest

  7. #7

    Default Re: What's a "Rippling xOr?"

    In article <t-online.com>,
    Uli Kusterer <de> wrote:
     

    An add ? Maybe it ripples to the right instead of the left.


    Simon Guest

  8. #8

    Default Re: What's a "Rippling xOr?"

    In article <BBC0D05C966881F610.0.0.0>,
    demon.co.uklocalhost (Simon Slavin) wrote:
     
    >
    > An add ? Maybe it ripples to the right instead of the left.[/ref]

    Yeah, looks like it is the same as an add in the end, just that it
    doesn't carry.

    Thanks for all your attempts at help :-)

    Cheers,
    -- Uli
    Uli Guest

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