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(Optics-Linux)

Lionel RUIZ
(Software-Videos)

Olivier NIVOIX
(Software-Linux)
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Lhoumeau Sky System - VIDEOS  
VIDEO IN TWIN MODE

To adapt 720p or 1080p rectangular video contents into fisheye format, you need to use the maximum of the circular surface of the screen.

To do this, you can use rectangular to polar coordinates with Photoshop or The Gimp to maximize the surface area of a quarter of the sphere and duplicate to the other side to get a good viewpoint for each user.

For linux users, JACQUES MONTIER (jacques.montier at numericable.fr) has made an automatic shell very efficient. 

download


Source image


duplicate and create a black border at the top to match the final desired proportion


transform into a square with Photoshop


Apply the polar filter distortion


truncate the excess to get a circle 

It is obviously advisable to create a script or batch to automate the process:

Tools to distort images from video can be downloaded here.

Programs to install:

-Mplayer for windows
http://www.numerama.com/telecharger/download/7511-mplayer-for-windows.html

-Imagemagick:
http://www.imagemagick.org/script/binary-releases.php#windows

Whatever version is compatible with your version of Windows (32 or 64 bit)

To rebuild the video (apart from mencoder)
-Virtualdub
http://www.virtualdub-fr.org/telechargement

To change codec
-MediaCoder
http://mediacoder.sourceforge.net/ http://mediacoder.sourceforge.net/

A/ decomposition of the video frame by frame

Use the batch file start.bat

1) into the image directory-by-frame
2) copy the video to break into this directory (*. avi, *. mpg, etc.)
3) change the file start.bat (right click on start and then edit)

for windows during the 1st use to change the first line of the script, the path to find mplayer, for example c: \ program files \ mplayer for windows
après la commande decompose, modifier le nom du fichier (ici in.wmv) decomposed after ordering, change the file name (here in.wmv)

4) launch the file start (double click it)
5) retrieve data in the subdirectory out, all png images, and sound in the file son.wav

B/ modification of a video

1) hooping video by a circular mask in 1080 pixels high: run cerclage.bat
2) add a black frame to the image: start encadrement.bat
3) dome deformation

To avoid artifacts during deformation in 1080p, you must add a black wire to each image. Operation in 2 stages:

1) adjust the parameters of black-start adjusts noir.bat typically the size of the image is that of the first in set
2) launch dome1080.bat

Recompose the video, we recommend to use Virtualdub

1) launch virtualdub
2) open the file menu, select the first frame of directory out
3) add the soundtrack (specify)
4) save format Avi
5) change the format: use MediaCoder



aurora_tromso2010-tor_even_mathisen.avi
Video of aurorae by Tor Even Mathisen
TWIN format 1200x1200
Xvid codec
2min42sec
Timelapses of different aurorae at Tromso (Norway) adapted to the dome projection.

Lionel RUIZ
© 2016 LSS Group - Yves LHOUMEAU & Lionel RUIZ