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Definitely a jelly of some sort.  If you know the speed of the ROV
decent and the diameter of the pipe, it should be possible to
calculate the size of the critter by determining its distance in
front of the pipe. This can be done by measuring the movement up the
image frame of the pipe compared to the head of the jelly.

However I am not competent to do that math. I would say it is a large
jelly, but not monstrous. Is should be possible to model it in 3D if
you have the camera's lens angle of view. Then Match the images up to
get a size.  You could also use Matchmove software to analyze the
image.

There is an inexpensive program with a free trial called PFHoe
http://www.thepixelfarm.co.uk/contentfull.aspx?content=pfhoe.htm

This might be able to define the spacial relation ships and export
the results to a 3D package for analysis.

Britt


>This may be a little easier for everyone.
>The video was captured from an ROV in the Gulf of Mexico at 3,540 feet.
>  http://video.google.com/videoplay?docid=8765811176506381835&pr=goog-sl
>
>
>>>
>>>I need some assistance identifying a marine organism.  My
>>>brother-in-law captains a ship in the Gulf of Mexico and their ROV
>>>recorded video of an unidentified marine organism.  Some believe
>>>that they've seen a giant squid and others think its a large
>>>species of jellyfish.  The pipe in the middle of the video is a
>>>marine riser and is 36" in diameter.  If you check the left side
>>>of the screen you'll see it swim upward past the riser as the ROV
>>>slowly pans down. It's tough to estimate size though because
>>>they're not sure exactly how close they were to the riser.  The
>>>ROV descends approximately 25' during the clip.  Some estimate the
>>>creature to be 75-100' in length.
>>>
>>>Any assistance, guesses, or thoughts would be appreciated.  Thanks.
>>>
>>>Joel
>>>
>>>
>>>
>>>Joel Lake
>>>Biological Sciences Department

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