Pablo Picasso according to wikipedia ... fauvism complimentary - - PowerPoint PPT Presentation

Pablo Picasso

The Fauvist Works of

fauvism

strong

brush strokes

complimentary

colours

bold wide heavy visible textured

simplified abstracted

according to wikipedia ...

the inspiration

paintings of Marie-Thérèse Walter by Pablo Picasso circa 1932

combination of f auvist and cubist elements

previous work

“Cubist Style Rendering from Photographs”

J.P. Collomosse and P.M. Hall

• general salient f

eatures identified

• planar f

eatures distorted using vector fields

• multiple perspectives achieved by use of multiple images
• assemble planes using image registration
• painterly render

characterization design future work

contents

characterization

shape

flowing curves bulbous exaggeration pinching thick black outlines simplification circles

characterization

colour

bright complimentary reversed surreal solid note - the artists colour wheel is red, yellow, blue ...

characterization

style

women patterns f ew gradients not exceptionaly painterly rough canvas texture dry brush additional lines

design

directly related to characterization three major components to consider shape

detect distort

colour

discover choose

style

strokes texture

components are seperable!

design

pre-process segment

edge discovery

set of curves

shape

distortion find circles local pinch

rot/scale/trans

extra lines eg - segmentation input image

design

to find circles ...

find center

C x=∑ xi Nx ,C y=∑ yi Ny

find radius

r=∑∣P−C∣

N

if f

• r all points P

valid++

∣r −k∣≤∣P−C∣≤∣rk∣

if circle! not circle!

validallowed valid≥allowed

point set

eg

design

ini tial point set polygonal shape

center point

result

approximating circle a=50% k=15 *actual output

point set

compute θ

=arccos  PQ⋅  PR

θ P Q R compute d f

• r P, Q, & R

d=∣ ∣C−P∣ ∣

d=C x−Px

if move P

P0=Pt C−P t= 1 2

split edge

E={e0,e1,... ,en} E0={e0,e1,... ,ei ,P0} E1={P0,ei1,...,en}

continue while more points

dP≤dR∧d P≤d Q∧≤min

set of edges no more points

design

local pinch ...

• riginal curve

point P shif ted pinched curve set P P P C C C Q R Q Q R R θ

design

eg

local pinching ...

*actual output

design

colour

enumerate colours group by major hue

RG∧RB GB∧GR BG∧BR ∣B−G∣≤30∧minB,GR ∣R−G∣≤30∧minR,GB ∣R−B∣≤30∧minR,BG

remove grays combine colours

∣ ∣C1−C2∣ ∣2≤k

BC1BC2 delete BC2

input paintings possible palette outputs ...

design

colour

draw cruves re-segment

• curves associated wi

th segments

• controls segment colour af

ter distortions

paint pixels paint patterns painterly render

paint black edges texturize

• paint flat colours

design

• pick regions of shadow and patternize
• alpha blending using

canvas texture

style

future work

• segmentation algori

thms and f eature recognition to allow characteristic distortion of specific f eatures such as eyes

• 3D models instead of photographs could allow f
• r

f eature recogni tion, shadow detection and perspective distorions

• extra distortions such as addi

tion of extra lines, shape cutting, intelligent replication, ...

WYSIWY G NPR: Drawing Strokes Directly on 3D Models

Kalnins, Markosian, Meier, Kowalski, Lee, Davidson, Webb, and Hughes

Cubist Style Rendering from Photographs

Collomosse and Hall