911 tape - Problems with analyses

Discussion in 'JonBenet Ramsey' started by Jayelles, Dec 22, 2005.

  1. Jayelles

    Jayelles New Member

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    Here is a message to you all:-[​IMG]
     
  2. Loading...


  3. Jayelles

    Jayelles New Member

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    Can you read it? Perhaps someone with a "trained eye" can read it?

    EDITED TO SAY - Play along with me here. There is a point to this.
     
  4. FULTON

    FULTON New Member

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    The link goes no where is that the point??? :doh:
     
  5. why_nutt

    why_nutt New Member

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    You are a naughty, naughty person.

    Edit, Select All.

    Edited to add: Or in other words....

    Dave: I have a 60-inch HDTV I built myself, and I see nothing.

    Aerospace Corporation: We have found secret_message.jpg.
     
  6. Jayelles

    Jayelles New Member

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    Cheeky Why_Nut! You're on the right track though. The jpg does indeed contain a message. Who can figure it out?

    I've tested this and it works so someone who understands graphics will work it out. Computers deal with sound and graphics in a very similar way and this little experiment may help explain how the correct equipment can analyse/enhance the 911 tape.
     
  7. Seeker

    Seeker Former Member

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    "HI" to you too Jayelles!
     
  8. why_nutt

    why_nutt New Member

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    Oh ho! Let me just "adjust" my monocle to view the "image" better. I see. My "levels" of understanding just soared.
     
  9. Jayelles

    Jayelles New Member

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    Good for you. The message was of course "HI".

    Graphics are made up of little dots called pixels. This image uses 24 bit colour - which means that the colour information about every pixel is stored using 24 binary digits - which means we can use over 16 million colours in the image. For example, if you used 2 bits to store each colour - you could have 4 colours - 00 01 10 and 11. 3 bits would have 8 colours - 000 001 010 011 100 101 110 and 111. The formula is 2 to the power number of bits.

    This is more colours than the human eye can differentiate between - but they are quite different to a computer.

    So I made the background white - code 255 255 255 and wrote the message in a slightly different shade of white - code 254 254 254. Total different codes to a computer which would see them as the following bit patterns:-

    background pixels - 111111111111111111111111
    message pixels- 111111101111111011111110

    a graphics program would allow you to show the colours or to replace one colour for another colour - thus revealing the message. If for example, you used the software to change all the 254 254 254 pixels to (say) 255 0 0, then the message would show in red. - you could say it was "digitally enhanced" to make it clearer.

    In forensic audio analysis - a sound is "sampled" at intervals (tens of thousands of samples per second) and stored in bit patterns - in much the same way as above. Tiny changes in these bit patterns would be detected by the computer even they cannot be heard by the human ear. Analysis of a sound recording such as this is performed using a piece of equipment called a spectrograph.

    It is therefore nonsense to claim that a "trained ear" is all that is necessary to determine the presence of voices on the 911 tape. Sophisticated computer equipment is used by the top forensic audio labs.

    If you were to use fewer bits to store each pixel in a graphic, then the number of colours would be reduced. The software would work to a set palette of colours and pixel colours might change slightly. This change may be imperceptable to a human eye but nevertheless, the colour would be different.

    Same with sound. If a sound is converted from analogue to digital and stored using (say) 16 bit sampling resolution, then only 16 bits worth of the sound sample could be stored and no matter how much a person tweaked the sound or saved it onto a computer with a 24 bit sound card - minute sound detail would be lost forever.
     
  10. Seeker

    Seeker Former Member

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    I didn't use any program....does this mean I just have good eyes?

    The letters looked like a very, very pale pink to me...
     
  11. Jayelles

    Jayelles New Member

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    Could be the settings on your computer - but it makes my point - the colours are seen as different by a computer. (I thought you were just a smarty pants!).

    Anyway - here is a screen capture of the graphic software showing the codes for pixels at different parts of the image:-

    http://www.forumsforjustice.org/forums/attachment.php?attachmentid=1585&stc=1

    And here is a screen capture of the image being revealed afer I instructed the software to replace the message colour with a darker colour. It is a coincidence that I chose pink for this. I could just as easily have chosen blue or black:-

    http://www.forumsforjustice.org/forums/attachment.php?attachmentid=1586&stc=1
     
  12. Seeker

    Seeker Former Member

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    Your probably right Jayelles. I have no idea what the settings are as far as color on my computer (I think the standard 16 bits?).
     

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