## Copyright (C) 2020 Jens
## 
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
## 
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
## 
## You should have received a copy of the GNU General Public License
## along with this program.  If not, see
## <https://www.gnu.org/licenses/>.

## -*- texinfo -*- 
## @deftypefn {} {@var{retval} =} bluescreen (@var{input1}, @var{input2})
##
## @seealso{}
## @end deftypefn

## Author: Jens <jens@orion>
## Created: 2020-10-03

# chromakey('adventure_rose', 20, 10)
# chromakey('cineon_before', 200, 100)

function chromakey (prj_name, k_e_matte, k_e_edge)

k_ds_matte = 1.0;
clip_white_thresh = 0.60;
clip_white_amp = 5;

clip_black_thresh = 0.40;
clip_black_amp = 5;

[im_rgb, ref_rgb] = prj_load(prj_name);

close all;
figure;
[matte, dev, conf] = supermatte(im_rgb, ref_rgb, k_e_matte);
imshow(matte); title("matte")
figure;
imshow(dev); title("dev")
figure;
imshow(conf); title("conf")

matte_clipped_w = clip_white(matte, clip_white_thresh, clip_white_amp);
matte_clipped_b = clip_black(matte_clipped_w, clip_black_thresh, clip_black_amp);
matte = matte_clipped_w;

figure;
imshow(matte_clipped_w.*matte_clipped_b); title("matte_{clipped}")

figure;
intermediate = im_rgb.*matte;
imshow(intermediate); title("intermediate")

figure;
edges = 1-supermatte(intermediate, ref_rgb, k_e_edge);
imshow(edges); title("edges")

figure;
final = max(0, intermediate - k_ds_matte.*edges.*ref_rgb);
imshow(final); title("final")

imwrite(intermediate, sprintf('%s.intermediate.png',prj_name),'png','alpha', matte);
imwrite(edges, sprintf('%s.edges.png',prj_name),'png');
imwrite(final, sprintf('%s.final.png',prj_name),'png','alpha', matte);
imwrite(matte, sprintf('%s.alpha.png',prj_name),'png');
imwrite(matte_clipped_w, sprintf('%s.alpha_clipped_w.png',prj_name),'png');
imwrite(matte_clipped_b, sprintf('%s.alpha_clipped_b.png',prj_name),'png');

function mask = mask_clip_above(mask_in, thresh)
		k = mask_in < thresh;
		mask = k .* mask_in + kn;
endfunction

function mask = mask_clip_below(mask_in, thresh)
		k = mask_in > thresh;
		mask = k .* mask_in  + 0;
endfunction

endfunction