[PD] Blur FX on a specific area on video and camera focus blur

Samuel Burt composer.samuel.burt at gmail.com
Wed Jun 30 21:18:51 CEST 2010

On a related note, I've been hoping to find a way to add movable
camera focus blur to 3-d primitives.  Is there an easy way to do this
with Gem?

See the example on this page:


> Message: 2
> Date: Wed, 30 Jun 2010 10:47:12 -0400 (EDT)
> From: Mathieu Bouchard <matju at artengine.ca>
> Subject: Re: [PD] Blur FX on a specific area on video.
> To: Olivier Baudu <lamouraupeuple at gmail.com>
> Cc: PD List <pd-list at iem.at>
> Message-ID: <alpine.DEB.2.00.1006301030550.10917 at paik.artengine.ca>
> Content-Type: text/plain; charset="iso-8859-15"; Format="flowed"
> On Tue, 29 Jun 2010, Olivier Baudu wrote:
>> We want to process a blur effect on a specific area on video.
>> To be clearer, we want to blur faces...
>> To find faces, we use [pix_opencv_haarcascade ]...
> 1. blur the whole picture
> 2. use the output of your detector to make a mask
> 3. use the mask to "cut holes" through the normal picture, using the
> blurred picture. if you were to only do [pix_texture] on the
> final result, you can do [pix_texture] on both the normal and
> the fully blurred image and combine them using two separate
> [rectangle], an [alpha], and a [pix_alpha].
> even though it may waste a lot of blurred pixels, at least you can do it
> on all sorts of nonrectangle shapes.
> je suis pass? tr?s proche d'utiliser ?a hier, mais avec une autre sorte de
> d?tection compl?tement diff?rente, en particulier parce qu'on voulait que
> la zone floue soit nonrectangulaire et graduelle (un "gradient" d'alpha,
> dans l'jargon).
>  _ _ __ ___ _____ ________ _____________ _____________________ ...
> | Mathieu Bouchard, Montr?al, Qu?bec. t?l?phone: +1.514.383.3801

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