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HelicopterMain Discussion › FAI Time Warp "Ghost Hover"
03-19-2009 04:31 PM  8 years agoPost 1
Jlerch

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Parrish, Florida

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Here is a little something I'm playing with. This is a temporally cohesive image stack of Dwight Shilling's Sunday morning hovering routine during the Can-Am FAI contest in Tampa last weekend.

Each image was created by grabbing a still frame from the video sequence every 2 seconds. Then stacking with a bit of home brewed software. The result is a 2 dimensional representation of a 4 dimensional event. Every helicopter image is separated by 2 seconds of time and in the accurate position with respect to each other, the course, and the pilot.

Click for larger image.

"Ghost Hover"

Watch at YouTube

in High Def -> http://www.youtube.com/watch?v=GsVCSNgvQs4&fmt=22

I have data for a few of the other competitors that I am currently working on.

I am THANKFULL that the camera died before I got up in front of it, because that would have been ugly! :-)

James Lerch - Tampa Bay FL

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03-19-2009 04:32 PM  8 years agoPost 2
Aox

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Irvine, CA

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Jim, this is very cool. Thumbs up, man, a stroke of genius.

-Aox

Synergy N9~/~Trex250-450-600N~/~Logo 500 3D~/~Rave 3D~/~Mini-Titan A109K2
AMA #902257 - OCMA

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03-19-2009 05:33 PM  8 years agoPost 3
QuantumPSI

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Atlanta, GA

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This is actually a testament of the kind of maneuvers involved and the precision needed to perform them. I am very impressed with the hexagon. When I get my nitros back in the air, I'm going to try some of these maneuvers just to see if I'm as good as I think I am

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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03-19-2009 05:43 PM  8 years agoPost 4
GM1

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Tallahassee, Florida​US

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Whoa!

James,
If you got mine, I'd LOVE to have it but I suspect I'd be embarrassed for anyone else to see it.

Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

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03-19-2009 06:01 PM  8 years agoPost 5
Dood

rrProfessor

Wescanson

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If the processing was instant, looks like it could help to the judges' advantage tremendously.

Never again could there be an argument about unfair judges when you have proof in pictures.

  ▲
▲ ▲

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03-19-2009 06:27 PM  8 years agoPost 6
RCHeliJim

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Orem, UT USA

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Wonderful pics and flying - absolutely beautiful!!



Go Fly, Have Fun!!
-Team Quick UK

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03-19-2009 07:23 PM  8 years agoPost 7
Clearance

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Rain Forest of​Western Canada

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Let's eliminate the subjective nature of judging and let computer analysis of these images do the job

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03-19-2009 08:36 PM  8 years agoPost 8
Jlerch

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Parrish, Florida

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Gordie,

I'm sorry to say, but the camera pooped out before your flight came around. I've got data for Dwight, Cliff, and Tim.

However, do you know what place you were in line Sunday Morning? I may have your upstairs maneuvers on a 2nd camera I have yet to process. The heli will only be a dot, but at 30fps the dots will connect to reveal the flight path in all its detail :-)

James Lerch - Tampa Bay FL

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03-19-2009 08:40 PM  8 years agoPost 9
Daves

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Tallahassee, Florida

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James,

That's really cool! That really allows someone who has never seen a hovering maneuver before get a accurate representation of what is involved. It is far more than picking the model up into a hover, doing a few periouettes and setting the model down again.

Ain't technology great, especially when you know how to use it <VBG>.

Dave Sellars

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03-19-2009 09:00 PM  8 years agoPost 10
TachyonDriver

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Chipping, Lancs, UK

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+1 to the above!

James - "temporally cohesive" - I really do like that term!

Thanks,
Tach.

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!

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03-19-2009 09:53 PM  8 years agoPost 11
Dilbeck

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Springdale Arkansas

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The last picture, Rectangle 4 point pirouettes, shows just how precise this event is. The pilots do this in gusty winds also. Heck if the NFL/NBA can have instant replay to help the referees/judges then so be it. By the way how did you do it? I want to use this tool to see how BAD I really am.

Clint

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03-19-2009 11:04 PM  8 years agoPost 12
Jlerch

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Parrish, Florida

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I'm glad the images are getting a warm reception. More to come.
James - "temporally cohesive" - I really do like that term!
I've been Jonesing to use that term since whatever STTNG episode it was mentioned in, some several decades ago!
By the way how did you do it? I want to use this tool to see how BAD I really am.
Oh Its "easy"
  • Load the video into Ulead video studio and trim to to length for each manuever, then save it as an uncompressed AVI file
  • Load the AVI file into Virtual Dub and export the file as a sequence of jpg images (4000 or so)
  • Pick an image at the 1/3 mark and the 2/3 mark, open in Paint shop pro and average the two images together, manually remove the helicopter, and save the new image as a "reference file"
  • using visual basic, create a program to loop thru each still image in steps of 60 (2 seconds). For each pixel in the new image, compare it to the reference image, if the pixel is different "enough" copy the pixel to an output file, and flag that pixel location as being modified (so we don't change it again in the future) Once your out of still images, save the output file.
  • repeat the above step, altering the "different enough" pixel values to get a decent looking image
If I was a real programmer, I could do all this in one program, prefereable in C or Visual C, but I just aint that hardcore!

James Lerch - Tampa Bay FL

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03-20-2009 02:05 AM  8 years agoPost 13
nighttrain

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Louisville KY

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Wow, that is so cool. This is gonna be big!
Doug

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03-20-2009 02:17 AM  8 years agoPost 14
cstoneman

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Colorado

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That is very cool. I want to get back into it. I haven't flown any FAI for a long time. So long in fact, that there was a 4 point box back then, and you couldn't use a HH gyro.

That stuff is the most fun I have had. It really takes a lot of concentration, and the pressure really messes with you.

I could never fly as good in front of the judges, as during practice.

FAI is an area where jittery thumbs don't work well.

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03-20-2009 02:41 AM  8 years agoPost 15
Pureadrenalin

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Waipahu,Hi. 96797

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wow that is cool.

hammerhead_customs

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03-20-2009 03:04 AM  8 years agoPost 16
Boidman (RIP)

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The Home Stretch

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Jlerch,

Many years ago I looked over the shoulder of a professional Photoshop user for about an hour, and was impressed and often amazed.

My efforts are done with comparatively antique software. Everything done involves substantial grunt, grind , and time.

Your output is a-one, top-notch, first-class, peachy-flockin'-keen.

Do more. Tickle our collective fancies further. Get no sleep.

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03-21-2009 02:22 AM  8 years agoPost 17
Jlerch

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Parrish, Florida

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A little more, too wet your whistle, follow the links for the HD versions

Watch at YouTube

Watch at YouTube

Watch at YouTube

Watch at YouTube

Watch at YouTube

Watch at YouTube

James Lerch - Tampa Bay FL

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03-21-2009 02:53 AM  8 years agoPost 18
cstoneman

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Colorado

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That auto is very nice.

Maybe not impressive to the crowd, but flyers know how nice it is.

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03-21-2009 08:09 PM  8 years agoPost 19
Jlerch

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Parrish, Florida

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To complete the set, I present:

"Ghost Hover"

Watch at YouTube

in High Def -> http://www.youtube.com/watch?v=GsVCSNgvQs4&fmt=22

PS. Try to ignore the 1st twelve seconds.

James Lerch - Tampa Bay FL

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03-21-2009 08:21 PM  8 years agoPost 20
QuantumPSI

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Atlanta, GA

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TOO COOL!

...now where was I, dh/dt = BS-dx/dt
I will fly you forever... till earth do us part

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HelicopterMain Discussion › FAI Time Warp "Ghost Hover"
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