mo z i l l a I n t r o d u c t i o n D a a l a - - PowerPoint PPT Presentation

mo z i l l a
SMART_READER_LITE
LIVE PREVIEW

mo z i l l a I n t r o d u c t i o n D a a l a - - PowerPoint PPT Presentation

D a a l a : A P e r c e p t u a l l y - D r i v e n S t i l l P i c t u r e C o d e c J e a n - M a r c V a l i n , N a t h a n E . E g g e , T h o ma s J . D a e d e


slide-1
SLIDE 1

D a a l a : A P e r c e p t u a l l y

  • D

r i v e n S t i l l P i c t u r e C

  • d

e c

J e a n

  • M

a r c V a l i n , N a t h a n E . E g g e , T h

  • ma

s J . D a e d e , T i mo t h y B . T e r r i b e r r y , C h r i s t

  • p

h e r M

  • n

t g

  • me

r y

I C I P 2 1 6 h t t p s : / / j m v a l i n . c a / s l i d e s / i c i p 2 1 6 _ s l i d e s . p d f

mo z i l l a

slide-2
SLIDE 2

I n t r

  • d

u c t i

  • n
  • D

a a l a i s a R

  • y

a l t y

  • f

r e e v i d e

  • c
  • d

e c

  • R

e p l a c e s t r a d i t i

  • n

a l c

  • d

i n g t

  • l

s w i t h n e w / u n c

  • mmo

n

  • n

e s

  • I

n t r a f r a me s u s e d a s s t i l l p i c t u r e c

  • d

e c

– E

v a l u a t e d a t P C S 2 1 5

– S

i g n i fi c a n t l y i mp r

  • v

e d s i n c e t h e n

slide-3
SLIDE 3

D a a l a T e c h n i q u e s

  • L

a p p e d t r a n s f

  • r

ms

– 4

x 4 t

  • 6

4 x 6 4 D C T s , 4

  • p
  • i

n t l a p p i n g

  • M

u l t i

  • s

y mb

  • l

a r i t h me t i c c

  • d

i n g

– A

l p h a b e t s i z e u p t

  • 1

6 ( f e w e r s y mb

  • l

s t

  • c
  • d

e )

  • P

e r c e p t u a l v e c t

  • r

q u a n t i z a t i

  • n

( P V Q )

– G

a i n

  • s

h a p e q u a n t i z a t i

  • n

w i t h s p h e r i c a l q u a n t i z e r

– S

i g n a l

  • f

r e e a c t i v i t y ma s k i n g

  • C

h r

  • ma

f r

  • m

l u ma ( C f L ) p r e d i c t i

  • n
  • D

e r i n g i n g fi l t e r

slide-4
SLIDE 4

P C S 2 1 5

  • D

i d w e l l

  • n

e s

  • me

i ma g e s

  • N
  • t

s

  • w

e l l

  • n
  • t

h e r s

0.25 bpp

slide-5
SLIDE 5

I m p r

  • v

e m e n t s S i n c e P C S 2 1 5

  • N

e w d e r i n g i n g fi l t e r

  • F

i n e r c h r

  • ma

q u a n t i z a t i

  • n
  • L

a p p i n g r e d u c e d t

  • 4

p

  • i

n t s

  • 6

4 x 6 4 D C T

  • R

e d u c e d

  • v

e r h e a d e n t r

  • p

y c

  • d

e r

slide-6
SLIDE 6

D e r i n g i n g F i l t e r D e s i g n G

  • a

l s

  • S

mo

  • t

h

  • u

t r i n g i n g a r t i f a c t s

  • P

r e s e r v e e d g e s a n d t e x t u r e

  • H

a v e r e a s

  • n

a b l e c

  • mp

l e x i t y

– B

e e a s y t

  • v

e c t

  • r

i z e ( S I M D )

  • O

r i g i n a l l y d e s i g n e d f

  • r

v i d e

slide-7
SLIDE 7

D e r i n g i n g F i l t e r O v e r v i e w

  • C
  • mp

u t e d

  • n

c

  • d

e d 8 x 8 b l

  • c

k s

  • C
  • n

d i t i

  • n

a l r e p l a c e me n t fi l t e r

  • D

i r e c t i

  • n

a l 3 5

  • t

a p s e p a r a b l e fi l t e r

  • D

e c

  • d

e r

  • s

i d e d i r e c t i

  • n

e s t i ma t i

  • n

( n

  • s

i g n a l i n g )

  • F

i l t e r s t r e n g t h s i g n a l e d

  • n

c

  • d

e d s u p e r b l

  • c

k s ( 6 4 x 6 4 )

slide-8
SLIDE 8

C

  • n

d i t i

  • n

a l R e p l a c e m e n t F i l t e r

  • F
  • r

e a c h fi l t e r e d p i x e l

– R

e p l a c e t a p v a l u e s t

  • d

i s s i mi l a r t

  • c

e n t e r p i x e l

– m

a s k

i , j

: = | t a p

i , j

– c e n t e r

i

| < T

– I

F m a s k

i , j

= T H E N t a p

i , j

: = c e n t e r

i

26 8 22 25 24 23 80 R e p l a c e me n t ma s k f

  • r

T = 5 1 17 3 1 2 55 26 25 22 25 24 23 25 A v e r a g e = 2 9 A v e r a g e = 2 4 I n p u t I n p u t a f t e r r e p l a c e me n t F i l t e r e d P i x e l

slide-9
SLIDE 9

C

  • n

d i t i

  • n

a l R e p l a c e m e n t F i l t e r ( c

  • n

t )

  • E

x p r e s s fi l t e r i n t e r ms

  • f

d i f f e r e n c e t

  • c

e n t e r

  • W

e i g h t n

  • r

ma l i z a t i

  • n

i s c

  • n

s t a n t

  • R(x,T)

e a s y t

  • c
  • mp

u t e

  • V

e c t

  • r

i z e s c

  • mp

l e t e l y

slide-10
SLIDE 10

D i r e c t i

  • n

a l F i l t e r i n g

  • 7
  • t

a p fi l t e r a l

  • n

g d i r e c t i

  • n
  • 5
  • t

a p fi l t e r a c r

  • s

s l i n e s ( l

  • w

e r t h r e s h

  • l

d )

26 8 22 25 24 23 80 Second filter Effective spatial support Filtered pixel

w e i g h t s : [ 1 2 3 ( 4 ) 3 2 1 ] w e i g h t s : [ 1 1 ( 1 ) 1 1 ]

slide-11
SLIDE 11

D i r e c t i

  • n

E s t i m a t i

  • n
  • M

i n i mi z e e r r

  • r

b e t w e e n d e c

  • d

e d i ma g e a n d d i r e c t i

  • n

a l l i n e a v e r a g e s

  • F

a s t , v e c t

  • r

i z a b l e a l g e b r a i c s i mp l i fi c a t i

  • n

s

slide-12
SLIDE 12

B e f

  • r

e D e r i n g i n g

slide-13
SLIDE 13

A f t e r D e r i n g i n g

slide-14
SLIDE 14

R e s u l t s

  • C
  • mp

a r e d t

  • P

C S 2 1 5 ( B D

  • r

a t e )

– N

e w d e r i n g i n g fi l t e r

– F

i n e r c h r

  • ma

q u a n t i z a t i

  • n

– L

a p p i n g r e d u c e d t

  • 4

p

  • i

n t s

– 6

4 x 6 4 D C T

– R

e d u c e d

  • v

e r h e a d e n t r

  • p

y c

  • d

e r

slide-15
SLIDE 15

B i k e . 2 5 b p p ( P C S 2 1 5 )

slide-16
SLIDE 16

B i k e . 2 5 b p p ( I C I P 2 1 6 )

slide-17
SLIDE 17

F u t u r e W

  • r

k

  • E

x p e r i me n t w i t h i n t r a p r e d i c t i

  • n
  • I

mp r

  • v

e n

  • n
  • p

h

  • t
  • g

r a p h i c c

  • n

t e n t c

  • d

i n g

  • A

d d a l p h a c h a n n e l s u p p

  • r

t

  • S

u p p

  • r

t f

  • r
  • t

h e r c

  • l
  • r

s p a c e s ( e . g . Y C g C

  • )
  • D

e fi n e c

  • n

t a i n e r f

  • r

ma t

  • A

d d r e s s r e s u l t s f r

  • m

I C I P 2 1 6 G r a n d C h a l l e n g e

slide-18
SLIDE 18

C

  • n

c l u s i

  • n
  • D

a a l a c

  • u

l d b e a g

  • d

s t a r t i n g p

  • i

n t f

  • r

a r

  • y

a l t y

  • f

r e e s t i l l i ma g e c

  • d

e c

Questions?