メタメリズムを使ったアート作品を作るための絵の具の調合割合を計算する手法を開発しました.ある光のもとで観測した油絵と別の光のもとで観測した油絵が異なる絵に見えるトリックアート作品を作ることができます.
We proposed a method to estimate the mixing ratio of oil paints in order to create artistic illusion caused by metameric paints. You can create artistic illusion that makes different picture seen under different light.
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Metamerism Art 2013
1. Mixing paints for generating
metamerism art under 2 lights and 3
object colors
Daisuke Miyazaki
Masashi Baba
Ryo Furukawa
Shinsaku Hiura
Kanami Takahashi
Hirooki Aoki
Masahito Aoyama
Computer Graphics Laboratory, Hiroshima City University
http://www.cg.info.hiroshima-cu.ac.jp/
3. Introduction(2/3)
Perception(3)
Reflection model(5)
Art [Valluzzi 2012]
Cost function(4)
Experiment(3)
CG Lab, Hiroshima City University
http://www.cg.info.hiroshima-cu.ac.jp/
Watermark [Bala, Braun, Loce 2009]
Microbiology [Kobayashi, Yamada,
Hiraishi, Nakauchi 2012]
[Our work]
Intentionally cause expected metamerism for oil painting art
Related work
8. Introduction(3)
Perception(3)
Reflection model(1/5)
Cost function(4)
Previous model: linear model
Experiment(3)
Our model: exponential model
[Finlayson, Morovic 2005]
[Alsam, Finlayson 2007]
[Miyazaki, Nakamura, Baba, Furukawa,
Aoyama, Hiura, Asada 2012]
s
w1 d 1
w2 d 2
wN p d N p
CG Lab, Hiroshima City University
http://www.cg.info.hiroshima-cu.ac.jp/
d: spectral reflectance
w: mixing weight
s
d
w1
1
d
w2
2
wN
dNpp
Elegant relationship
s
d
w1
1
d
w2
2
wN
dNpp
exp w1 log d 1
w 2 log d 2
w N p log d N p
Our model = linear model in logarithmic space
Reflection model of mixing paints
16. CG Lab, Hiroshima City University
http://www.cg.info.hiroshima-cu.ac.jp/
w1
w
min
PE1 D
3
PE1 Dmax
max
PE 2 Dw1
3
PE 2 Dmin
w
Cost function
w2
PE1 D
PE2 Dw2
18. Introduction(3)
arg min
w 1, w 2, w 3
Perception(3)
Reflection model(5)
w1
PE1 D
w1
PE 2 D
Cost function(4/4)
w3
2
w3
0.5
PE1 D
PE 2 D
Experiment(3)
CG Lab, Hiroshima City University
http://www.cg.info.hiroshima-cu.ac.jp/
w3
PE1 D
w3
PE 2 D
Cost function
w2
0.5
w2
2
PE1 D
PE2 D