jitter image splitted on 3 videoprojectors? how do you do that?


Anonymous

Anonymous
Sep 10, 2009 at 2:26pm

Salut Igor!

> with bluring the edge of the images on the 2 or 3 screens

Cherche “softedge” sur Google ou sur le forum.

D.rik

#45414
Sep 12, 2009 at 6:31pm

Last spring I made a patch/app that I call “Edge Blender” to span one HD movie across 2 screens with optional edge blending:
http://www.zachpoff.com/site/software/edgeblenderforum.zip
(forum wouldn’t allow me to attach the 550k zip)

screenshots (with lousy LCD projectors):
http://www.zachpoff.com/site/software/images/edge-blender-full-with-interface.jpg
http://www.zachpoff.com/site/software/images/edge-blender-full.jpg

It handles arbitrary scaling and positioning and has an adjustable opacity contour for the blend (to deal with de-gamma and projector nonlinearities). It’s designed to be released as a standalone app but I never bothered. You can hack it up and use whatever parts you need.

I attached it below and included a preference file, some alignment test images, and more photo documentation.

It works fine but you need to use high-contrast DLP projectors because your black levels need to be very dark. See this excellent web page for an explanation of the basic idea:
also see: http://local.wasp.uwa.edu.au/~pbourke/texture_colour/edgeblend/

The forum thread where I stole the basic idea:
http://www.cycling74.com/forums/index.php?t=msg&goto=176871&rid=4723&S=ea9caf13c654cc4df26f9607c9d9be96&srch=edge+blending#msg_176871

Enjoy,
-Zach

#163728
Sep 13, 2009 at 10:16am

wonderful !!!
thx a lot to share it.

f./

#163729
Sep 14, 2009 at 8:18pm

If you are a fan of GLSL shaders and Matrox D2G’s, I came up with a solution for splitting a source to 2 screens and doing overlap/edgefade. The “tr.overlap3″ shader will do the same for 3 screens (matrox t2g, etc.). The benefit of this solution is that it all works in a single window/context.

Best,
Andrew B.

#163730
Sep 15, 2009 at 2:00pm

Wow Andrew, this is really cool!

#163731
Sep 19, 2009 at 9:36pm

Hi,

Is it 2 screen or 3 screens blending ? To put one on top of the others ?

Merci anyway Wink

Ambroise

#163732
Dec 2, 2009 at 10:30pm

Hello , This tr.overlap is very interesting. I need some help to modify it for cylindrer image with a fade to close the circle. Somebody can help me to reed the shader.
Thanks.

#163733
May 10, 2010 at 9:38pm

Hi,
Is someone have Andrew’s patch “edge blender” ?

Cause, the new forum..

thanks a lot!

#163734
May 10, 2010 at 11:59pm

I think this is it. Enjoy…

– Pasted Max Patch, click to expand. –
#163735
May 30, 2011 at 4:57am

My URL for “edge blender” has changed and I can’t edit my previous post. It lives here now:

http://www.zachpoff.com/site2/wp-content/uploads/software/edgeblenderforum.zip

For archive purposes, the patch is below (but I recommend downloading the ZIP since it has a prefs file, test images and setup photos).

– Pasted Max Patch, click to expand. –
#163736

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