[Bf-vfx] Mango todos & feedback

[Adrian Jeakins]

I am new to blender development but as this is my area of interest I though
I'd jump in. I've done some playing around in the tile branch and I've
implemented a 2d corner pin node in it and I'm interested in doing some
more.

Would we not also need a node for adding the noise back into the cg or are
you planning to shoot grain plates on 50% gray?

The current industry standards for keying are really:

- The Primatte type algorithm where the 3d image space is segmented by a
polygon. The details of this algorithm are of course secret as the
represent the source of significant commercial competition. Time for for an
open source implementation? The good thing about this style of algorithm is
that the  user provides input to converge the algorithm to the correct
solution for the part of the image that they want to key and combine
multiple keys to get the best overall key.

- In nuke(yes sorry), and maybe some other applications now, the IBK keyer
which is a two stage process where we extract a clean screen and then the
keying algorithm where we do the matte extraction. The clean screen is also
useful for Additive keying techniques.

l guess the real state of the art is stuff like this but I haven seen it in
use much and I would image it would be very slow:

http://www.csie.ntu.edu.tw/~cyy/projects/matting/papers/cvpr2001.pdf<https://exchange.imperial.ac.uk/owa/redir.aspx?C=5d2afc43808841ef8294475226ee9b62&URL=http%3a%2f%2fwww.csie.ntu.edu.tw%2f%7ecyy%2fprojects%2fmatting%2fpapers%2fcvpr2001.pdf>

I've found that the ultimate key technique + a simple green-minus-red +
additive keyer (http://www.vfxwiki.org/tiki-index.php?page=additive+keyer)
can give a very good result but I agree there is a need for some more
advanced techniques.

in terms of small things I think we could do with:

- Addition of an abs option to the math node.
- Addition of max, min options in the color mix node.


Adrian


On Sun, Apr 15, 2012 at 12:24 AM, Dalai Felinto <dfelinto at gmail.com> wrote:

> > - Improved chroma key in Blender
>
> Does any one have a reference (paper, ...) of what a state-of-the-art algorithm would be?
>
>
> I helped with some of the matte nodes in Tile and can help someone willing to implement different algorithms (or perhaps implement it myself if it's inside my skill set range).
>
>
> Thanks,
>
> Dalai
>
>
> #### - original email ####
>
> Hi all,
>
> Two days ago we tested a fancy camera to film with, see
> http://mango.blender.org for more info.
>
> We will film in the week of 7-11 May, which is just a month away only now!
> Time to get a couple of issues settled and organized.
>
> Topics I can think of:
>
> - Proper handling of RAW files from cameras like Sony F65 or Red Epic.
>  (F65 RAW stores 10 Mbyte per 4k frame, the exr half size is 40 MByte.
> Suspicious...)
> - Denoise filters
> - Improved chroma key in Blender
>
> Sebastian Koenig is working in the studio here now and will be gathering
> feedback as well. Hopefully we can turn feedback also into actions here for
> coding work!
>
> Laters,
>
> -Ton-
>
> ### - ###
>
>
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>
>
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