[PPT] - V i d e o C o d e c T e s t i n g a n d Q u a PowerPoint Presentation

SLIDE 1

1

V i d e

C
d

e c T e s t i n g a n d Q u a l i t y M e a s u r e me n t

d r a f t

d

a e d e

n

e t v c

t

e s t i n g

1

T h

ma

s D a e d e

SLIDE 2

2

O v e r v i e w

O

p e r a t i n g c

n

d i t i

n

s

f

c

d

e c

M

e t h

d
f

q u a l i t y me a s u r e me n t

T

e s t i n g ma t e r i a l

SLIDE 3

3

A r e W e C

mp

r e s s e d Y e t ?

T

e s t i n g d e s c r i b e d i n t h i s p r e s e n t a t i

n

i s i mp l e me n t e d a t a r e w e c

mp

r e s s e d y e t . c

m

SLIDE 4

4

O p e r a t i n g P a r a me t e r C h

i

c e s

R

a t e c

n

t r

l

me t h

d
M

a x i mu m d e l a y

F

r a me t y p e p a t t e r n s

L
k

a h e a d / 2 p a s s

SLIDE 5

5

J C T

L

1 1

Specifies test sequences and operating

conditions

– Constant quantizer, no rate control

Setup is HEVC specific
Large source of contention for libvpx

comparisons

SLIDE 6

6

C

n

fi g u r a t i

n

: H i g h

l

a t e n c y

T

e s t s e q u e n c e s a r e s h

r

t ( 2

4

s e c

n

d s , d e p e n d i n g

n

f r a me r a t e ) , t y p i c a l f

r

D A S H s t r e a mi n g

r

s t

r

e d c

n

t e n t

A

l l c

d

i n g t

l

s a r e a l l

w

e d

L
n

g l

k

a h e a d

r

t w

p

a s s i s a l l

w

e d

G
a

l i s t

g

e t ma x i mu m q u a l i t y p e r fi l e s i z e f

r

t e s t s e q u e n c e

C

u r r e n t l y

n

l y s u p p

r

t e d mo d e i n A W C Y

SLIDE 7

7

C

n

fi g u r a t i

n

: L

w
l

a t e n c y mo d e

M

u c h l

n

g e r s e q u e n c e s ( 1 5 s e c

n

d s )

N
f

r a me d e l a y a l l

w

e d

– N

l
k

a h e a d

– N

u

t

f
r

d e r f r a me s

C

B R mo d e w i t h b u f f e r mo d e l

SLIDE 8

8

Q u a l i t y M e a s u r e me n t f a l l s i n t

t

w

c

a t e g

r

i e s :

O

b j e c t i v e ( me t r i c s )

S

u b j e c t i v e ( h u ma n t e s t i n g )

SLIDE 9

9

O b j e c t i v e M e t r i c s

P

S N R

– M

e a n s q u a r e d e r r

r
n

a l

g

s c a l e

– V

e r y e a s y t

u

n d e r s t a n d

– C

r

r e l a t e s p

r

l y w i t h v i s u a l q u a l i t y

SLIDE 10

10

SLIDE 11

11

0.5dB PSNR

SLIDE 12

12

O b j e c t i v e M e t r i c s

S

S I M

– C

mmo

n p e r c e p t u a l me t r i c

P

S N R

H

V S

– P

S N R i n t h e f r e q u e n c y d

ma

i n , t a k i n g t h e c

n

t r a s t s e n s i t i v i t y f u n c t i

n

( C S F ) i n t

a

c c

u

n t

F

a s t M S

S

S I M ( F A S T S S I M )

– S

S I M c a l c u l a t e d a t mu l t i p l e s c a l e s t

a

c c

u

n t f

r

t h e C S F

SLIDE 13

13

O b j e c t i v e M e t r i c s

S

S I M a n d F A S T S S I M g i v e l i n e a r r e s u l t s f r

m
1

, s

t

h e C i mp l e me n t a t i

n

s i n t h e D a a l a c

d

e b a s e c

n

v e r t t

a

l

g

a r i t h mi c d e c i b e l s c a l e t

ma

t c h P S N R a n d P S N R

H

V S

SLIDE 14

14

O b j e c t i v e M e t r i c P i t f a l l s

O

n l y t a k e i n t

a

c c

u

n t l u ma

S

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

– I

n p u t a n d

u

t p u t f r a me s mu s t h a v e a 1 : 1 c

r

r e s p

n

d e n c e

I

mp l e me n t a t i

n

s ma y g i v e s l i g h t l y d i f f e r e n t r e s u l t s

– U

s e r e f e r e n c e i mp l e me n t a t i

n

s i n t h e D a a l a r e p

s

i t

r

y

SLIDE 15

15

M e t r i c G r a p h i n g Linear

SLIDE 16

16

M e t r i c G r a p h i n g Logarithmic

SLIDE 17

17

B D

r

a t e

C
mp

u t e s t h e a r e a d i f f e r e n c e b e t w e e n t w

c

u r v e s i n t h e l

g
l
g

d

ma

i n

G

i v e s a s i n g l e n u mb e r f

r

a g i v e n r a n g e ( e . g . c

d

e c A g i v e s 5 % t h e fi l e s i z e f

r

t h e s a me me t r i c s c

r

e a s c

d

e c B )

SLIDE 18

18

B D

r

a t e

SLIDE 19

19

T e s t c l i p s

T

e s t c l i p s

r

g a n i z e d i n t

t

e s t s e t s

S

t

r

e d l

s

s l e s s l y

P

r e p r

c

e s s i n g a l r e a d y a p p l i e d ( d e i n t e r l a c i n g , f r a me d r

p

p i n g , e t c )

A

l l c l i p s i n t h e s e t s h

u

l d h a v e t h e s a me r e s

l

u t i

n

a n d l e n g t h

R

e d i s t r i b u t a b l e f

r

r e p l i c a t i

n
f

r e s u l t s

SLIDE 20

20

T e s t c l i p s

V

i d e

h

d

2

– 1

8 p 4 : 2 : c l i p s f r

m

D e r f ' s T e s t V i d e

C
l

l e c t i

n

( h t t p s : / / me d i a . x i p h .

r

g / v i d e

/

d e r f / )

4

k T e a r s

f

S t e e l

S

c r e e n s h

t

s

N

e e d mo r e !

SLIDE 21

21

S e e M

r

e

h

t t p s : / / w i k i . x i p h .

r

g / D a a l a

D

a a l a me t r i c t

l

s

– h

t t p s : / / g i t . x i p h .

r

g / ? p = d a a l a . g i t

A

r e W e C

mp

r e s s e d Y e t s

u

r c e s :

– h

t t p s : / / g i t h u b . c

m/

t d a e d e / r d _ t

l

/

– h

t t p s : / / g i t h u b . c

m/

t d a e d e / a w c y

SLIDE 22

22

Q u e s t i

n