Technical Fi e ld
[0001]
The p resent d i s c losur e rel a t es to l ivenes s d et ect ion us ing a n
1 0 ima g e .
Background Art
[0002]
A t echnology fo r p e r forming l ivenes s d e t ect ion us ing a c ame r a
1 5 h a s b e e n d e v e l o p e d . Th e l i v e n e s s d e t e c t i o n r e f e r r e d t o h e r e i n me a n s
det ermining whether o r not an o bj ect cap t u red b y a camera i s a l i v i n g
body. F o r exampl e, the l ivenes s d et ect i on i s u s ed fo r p revent i o n o f
imper sonat ion us ing a pho tog raph .
[0003]
2 0 As a p r i o r a r t d o c ume n t r e l a t e d t o l i v e n e s s d e t e c t i o n u s i n g a
camera, fo r examp le, there i s Pat en t Li t erat u re 1 . A sy st em o f P at ent
Li t erat u re 1 d i s clo s es a t echnolog y o f acqui r i n g images o f a per son
capt u red i n d i f ferent i l luminat ion envi ronmen t s b y con t rol l ing an
i l luminat ing l amp t o change the i l luminat ion envi ronment , and
2 5 d e t e rmi n i n g wh e t h e r o r n o t t h e c a p t u r e d o b j e c t i s a p e r s o n u s i n g t h e s e
images .
Ci tat i on Li s t
Patent L i terature
3 0 [ 0 0 0 4 ]
Pat en t L i t erat u re 1 : J apanes e Unexamined P at ent Appl i cat i o n
Pub l i c a t ion No . 2 003-178306
Summary of Invent ion
2
Technical P roblem
[0005]
An ob j ect o f t h i s d i s cl o su re i s t o imp rove the t echnology
di s cl o s ed i n P at ent Li t e rat u re 1.
5
So lut ion to P robl em
[0006]
A c omput e r - readab le med ium o f thi s d i s clos u re s t o res a p rog ram
execut ed by a comput e r . The program c a u s e s the c omput e r to e xecut e :
1 0 a d i s p l a y c o n t r o l s t e p o f c a u s i n g a d i s p l a y a p p a r a t u s t o d i s p l a y a f i r s t
s creen including a di s p l ay i n each of a p l u ral i t y o f reg ion s and a
s econd s creen includ in g a d i s p l ay di f f e r ent f r om the d i s p l ay o f the
f i r s t s c reen; an a c qui s i t ion s tep of a c qui r ing a plur a l i ty o f c a p tured
images tha t a r e gene rated by c a p tur ing a t a rget whi l e e a c h o f the f i r s t
1 5 s c r e e n a n d t h e s e c o n d s c r e e n i s d i s p l a y e d ; a n d a l i v e n e s s d e t e c t i o n
s t ep o f d e t ermining whether o r not the t arget i s a l i v ing b ody u s ing a
pl u ral i ty o f the capt u red images . The f i r s t s c reen inc lude s a t l e a st two
r e g ions h a v ing d i f f e r e n t di s p l ays .
[0007]
2 0 A l i v e n e s s d e t e c t i o n a p p a r a t u s o f t h i s d i s c l o s u r e i n c l u d e s : a
di s p l ay con t r o l u n i t co n figu red to caus e a d i spl ay apparat u s t o di s p l ay
a f i r s t s c reen inc luding a d i s p l ay i n each o f a p l u ral i t y o f reg ions and
a second s c reen including a d i splay di f f e r ent fr om the di spl ay o f the
f i r s t s c reen; a n acqu i s i t ion u ni t con f ig u red t o acqui re a p l u ral i t y o f
2 5 c a p t u r e d ima g e s t h a t a r e g e n e r a t e d b y c a p t u r i n g a t a r g e t wh i l e e a c h o f
the f i r s t s c reen a nd the s econd s c reen i s d i spl ayed; a nd a l ivene s s
det e c t ion un i t co n fi g u red t o d e t ermine whether o r n ot the t arget i s a
l i v ing b o dy us i n g a p l u ral i t y o f the capt u red images . The f i r s t s c reen
includes at l eas t two region s h avi n g d i f feren t d i spl ays .
3 0
a d i spl ay cont rol u ni t con f ig u red t o caus e a d i spl ay apparat u s to
di s p l ay a f i r s t s creen including a n indi cat ion i n each of a p l u ral i ty o f
region s and a s econd s creen including a n ind i cat ion d i f ferent f rom the
indi c a t ion o f the f i r s t s creen;
3
an acqui s i t i o n uni t co n figured to acqui re a p l u ral i ty o f capt u red
images gene rated when a t a rge t i s c a p tured by a came ra whi l e e a ch o f
the f i r s t s c reen a nd the s econd s c reen i s d i spl ayed; a nd
a l ivenes s d e t ect ion uni t con f ig u red to d et ermine whether o r not
the t arget i s a l iving body us in g a p l u ral 5 i t y o f t h e c a p t u r e d ima g e s .
The f i r s t s creen includes at l eas t two reg ions hav i n g d i f feren t
ind i c a t ions .
[0008]
A cont rol method o f t h i s d i s clos u re i s execut ed b y a compu t er .
1 0 Th e c o n t r o l me t h o d i n c l u d e s : a d i s p l a y c o n t r o l s t e p o f c a u s i n g a
di s p l ay apparatu s t o d i spl ay a f i r s t s creen includ ing a di spl ay in e a ch
o f a p lural i t y o f region s and a s eco n d s creen includ in g a di s p l ay
di f f e r ent fr om the di spl ay of the f i r s t s c reen; an acqu i s i t i o n s t ep o f
acqu i r ing a p l u ral i t y o f capt u red images that a r e gene rated b y
1 5 c a p t u r i n g a t a r g e t wh i l e e a c h o f t h e f i r s t s c r e e n a n d t h e s e c o n d s c r e e n
i s d i spl ayed; and a l ivenes s d e t ect ion s t ep of d et ermining whether o r
no t the t arget i s a l i v ing body us in g a p l u ral i t y o f the capt u red images .
The f i r s t s creen includes at l eas t two reg ions hav i n g d i f feren t di s p l ays .
2 0 Br i e f De s c r i p t i o n o f Dr awi n g s
[0009]
Fi g . 1 i s a di ag ram i l l u st rat i n g an over v i ew o f an o p erat i o n o f a
l ivenes s d et ect ion apparatu s o f a f i r s t exampl e embod imen t .
Fi g . 2 i s a b lock d iag ram i l l u st rat in g a funct ional co n figu rat ion
2 5 o f t h e l i v e n e s s d e t e c t i o n a p p a r a t u s o f t h e f i r s t e x amp l e emb o d ime n t .
Fi g . 3 i s a b lock d iag ram i l l u st rat in g a h a rdware con f ig u rat ion
of a comput e r that impl ement s the l i v enes s d et ect i on apparatu s o f the
f i r s t exampl e embodiment .
Fi g . 4 i s a f lowchar t i l lus t rat in g a f low o f p roces s ing execu t ed
3 0 b y t h e l i v e n e s s d e t e c t i o n a p p a r a t u s o f t h e f i r s t e x amp l e emb o d ime n t .
Fi g . 5 i s a d i ag ram i l l u st rat in g a s creen including two reg ions .
Fi g . 6 i s a di ag ram i l l u st rat in g a s creen including t h ree reg ions.
Fi g . 7 i s a d i ag ram i l l u st rat in g a cas e where a s creen i s d i v ided
i n bot h a h o r i zon t al d i rect ion and a v e r t i cal d i rect ion. .
4
Fi g . 8 i s a d i ag ram i l l u st rat in g a cas e where a boundary l ine o n
a s c reen i s det e rmined bas ed o n the pos i t ion o f a c ame r a .
Fi g . 9 i s a f i r s t di ag ram i l lus t rat ing a p l u ral i t y o f s creens
di s p l ayed o n a d i spl ay apparatus b y a d i spl ay cont rol u ni t .
Fi g . 10 i s a s econd d i ag ram i l lus t rat 5 i n g a p l u r a l i t y o f s c r e e n s
di s p l ayed o n the d i spl ay apparatus by the d i s p l ay con t rol uni t .
Fi g . 11 i s a d i ag ram i l l u st rat in g a g u ide ind i cat in g an
appropr i at e s i z e of a f a c e .
Fi g . 12 i s a d i ag ram i l l u st rat in g a s t at e where the o r i ent at ion o f
1 0 a f a c e i s mo v e d l e f t a n d r i g h t i n a s t a t e wh e r e t h e d i r e c t i o n o f t h e l i n e
o f s igh t i s f ixed.
Fi g . 13 i s a d i ag ram i l l u st rat i n g t empo ral changes in a face
di rect ion an d a l ine- o f- s ight di rect ion in a c a se whe r e the f a c e i s
swung l ef t and r ight wi t h the l ine-o f - s igh t d i rect ion b e ing f ixed .
1 5 F i g . 1 4 i s a f i r s t d i a g r am i l l u s t r a t i n g g u i d e i n f o rma t i o n .
Fi g . 15 i s a b lock di ag ram i l lus t rat ing a funct ional co n fi g u rat ion
of a l ivene s s d e t e c t ion apparat u s o f a s econd exampl e embod iment .
Fi g . 16 i s a f lowchar t i l lus t rat ing a f low o f p roces s i n g execut ed
by the l ivenes s d e t ect ion apparat u s o f the s econd exampl e embodiment .
2 0 F i g . 1 7 i s a d i a g r am i l l u s t r a t i n g g u i d e i n f o rma t i o n i n d i c a t i n g a n
act ion that a t arget ob j ect shou l d per f o rm n ext .
Fi g . 18 i s a d i ag ram i l l u st rat in g an imat ion o f a g u ide indi cat ing
the face d i r e c t ion.
Fi g . 19 i s a d i ag ram i l l u st rat in g g uide i n fo rmat ion includ i n g a
2 5 l i n e - o f - s i g h t p o s i t i o n a n d a f a c e d i r e c t i o n o f a t a r g e t o b j e c t .
Fi g . 20 i s a s econd d i ag ram i l lus t rat ing g uide i n f o rmat ion
including a l ine- o f - s igh t p os i t ion a n d a face d i rect i o n o f a t arget
obj e c t .
Fi g . 21 i s a d i ag ram i l l u st rat in g a mot ion o f a t arget o bj ect i n a
3 0 l i v e n e s s d e t e c t i o n a p p a r a t u s o f a f i r s t mo d i f i e d e x amp l e o f t h e s e c o n d
exampl e embodiment .
Fi g . 2 2 i s a d i ag ram i l l u st rat in g g uide i n fo rmat ion o f the
l ivenes s d et ect ion appa r a tus o f the f i r s t m odi f i ed exampl e o f t h e
s econd e x ample embodiment .
5
Fi g . 23 i s a d i ag ram i l l u st rat in g a mot ion o f a t arget o bj ect i n a
l ivenes s d et ect ion appa r a tus of a second modi f ied e xampl e o f the
s econd e x ample embodiment .
Fi g . 2 4 i s a d i ag ram i l l u st rat in g g uide i n fo rmat ion o f the
l ivenes s d et ect ion apparatu s o f the s 5 e c o n d mo d i f i e d e x amp l e o f t h e
s econd e x ample embodiment .
Fi g . 25 i s a f lowchar t i l lus t rat ing a f low o f p roces s i n g in a cas e
whe r e the l ivene s s d e t ect ion by the l ivenes s d e t ect ion apparatu s o f the
f i r s t exampl e embodiment and t h e l ivene s s d et e c t ion by the l ivene s s
1 0 d e t e c t i o n a p p a r a t u s o f t h e s e c o n d e x amp l e emb o d ime n t a r e s e q u e n t i a l l y
per fo rmed.
Exampl e Embodiment
[0010]
1 5 He r e i n a f t e r , e x amp l e emb o d ime n t s o f t h e p r e s e n t d i s c l o s u r e wi l l
be d e s cr ibed i n detai l wi t h reference to the d rawing s. I n the d rawings,
the same o r cor r e sponding e lement s a r e denoted by the same r e f e rence
numeral s , and redundant des cr ipt i o n wi l l b e omi t t ed a s neces s ar y fo r
cl ar i t y o f des cr ipt ion. Fu r ther , in the d rawings , f i l l i n g wi t h a col o r
2 0 o t h e r t h a n wh i t e i s e x p r e s s e d u s i n g a p a t t e r n s u c h a s a d o t p a t t e r n
un l es s o therwi s e speci f i ed . F u rther , var ious p rede t e rmined v alue s
( t h resholds o r the l ike ) a r e s tored in a s torage appa ratus in a dvanc e
un l es s o therwi s e speci f i ed .
[0011]
2 5 Fi r s t Ex amp l e Emb o d imen t

Fi g . 1 i s a di ag ram i l l u st rat i n g an over v i ew o f an o p erat i o n o f a
l ivenes s d et ect ion appa r a tus 200 0 o f the f i r s t examp l e embod iment .
Here, Fi g . 1 i s a d iag ram f o r faci l i t at ing under s t andi n g o f the over v i ew
3 0 o f t h e l i v e n e s s d e t e c t i o n a p p a r a t u s 2 0 0 0 , a n d t h e o p e r a t i o n o f t h e
l ivenes s d et ect ion apparatu s 2 00 0 i s no t l imi t ed to that i l lus t rat ed i n
Fi g . 1 .
[0012]
The l ivene s s d et e c t ion apparat u s 2 000 d et ermines whether o r n ot
6
a t arget obj ect 50 capt u red by a camera 1 0 i s a l i v in g body ( that i s ,
l ivenes s d et ect ion) . F o r exampl e, the l ivenes s d e t ect ion appa ratus
2000 di s t ingui shes a c a se whe r e the t a rget obj e c t 50 i s a real pe r son
and a cas e where the t arget o bj ect 5 0 i s o ther than a l i v ing b od y such
as a photog raph o f a p e r son ( that i s , a cas 5 e wh e r e n o t a r e a l p e r s o n b u t
a photog raph o f a p e r son o r the l ike i s cap t u red ) . However , the t arget
o f the l i v ene s s d e t ect ion i s n ot l imi t ed t o a per so n , and may b e another
animal such a s a dog o r a snake, o r a n inanimat e obj ect such a s a
robot . I n the fol lowing d i s clos u re, a cas e where a per son i s the t arget
1 0 o f t h e l i v e n e s s d e t e c t i o n i s s h own a s a n e x amp l e , b u t a s imi l a r me t h o d
can b e appl i ed to a c a se whe r e a n a n imal o the r than a p e r son o r a n
inanimat e obj ect such a s a robot i s the t arget o f the l ivene s s d et e c t ion.
[0013]
To do so, the l ivenes s d et ect ion apparat u s 2000 cont r o l s output
1 5 o f a s c r e e n p e r f o rme d b y a d i s p l a y a p p a r a t u s 2 0 . Th e d i s p l a y
appa r a tus 20 i s , fo r examp l e, p rovided i n a t erminal 60 ( smar tphone o r
the l ike) u s ed by the us er . Speci f i cal l y , the l ivenes s d et ect ion
apparatu s 200 0 caus es the d i s p l ay apparatu s 2 0 t o di spl ay a p l u ral i ty
of s c r een s 30 a t d i f feren t t iming s . F o r exampl e, in the examp l e o f Fi g .
2 0 1 , a f t e r c a u s i n g t h e d i s p l a y a p p a r a t u s 2 0 t o d i s p l a y a s c r e e n 3 0 - 1 , t h e
l ivenes s d et ect ion apparatu s 200 0 changes the s creen d i spl ayed on the
di s p l ay apparatu s 2 0 f rom the s creen 30- 1 t o a s c reen 30- 2 .
[0014]
Here, a t l eas t o n e s creen 3 0 has a p l u ral i t y o f regions 3 2 . I n the
2 5 p l u r a l i t y o f r e g i o n s 3 2 , t h e r e e x i s t a t l e a s t two r e g i o n s 3 2 t h a t i n c l u d e
di f f e r ent di s p l ays f rom e a ch o the r . Fo r examp l e, the s creen 30-1 i n
Fi g . 1 includes a region 32- 1 f i l l ed wi th whi t e and a r eg ion 3 2 -2 f i l l ed
wi t h bl ack. No t e that , f o r conven i ence o f i l lus t rat ion, b l ack i s
represented by a dot pa t t e rn.
3 0 [ 0 0 1 5 ]
For e a c h of the a t le a st two s c reens 30, the came ra 10 c a p tures
the t a rget obj e c t 50 whi l e the s creens 3 0 are d i spl ayed on the d i spl ay
apparatu s 20, and g enerat es capt u red images 4 0 rep res ent ing the res u l t .
Fo r examp l e, i n Fig. 1 , a cap t u red image 4 0 - 1 i s generated b y the
7
captur ing p e r formed whi l e the s c reen 30-1 i s d i splayed, a nd a c a p tured
image 40-2 i s generat ed b y the capt u ring p e r fo rmed wh i l e the s creen
30-2 i s d i s p l ayed .
[0016]
The l ivene s s d et e c t ion apparat u s 2 000 5 a c q u i r e s t h e p l u r a l i t y o f
capt u red images 4 0 generat ed i n thi s manner , an d d et ermines whether
o r n o t the t arget o bj ect 5 0 i s a l iving b ody u sing the p l u ral i t y o f the
capt u red images 4 0 acqui red.

CLAIMS
[Cl aim 1 ]
A c omput e r - readable medium s t o ring a program executed by a
compu t er , the p ro g ram caus ing 5 t h e c omp u t e r t o e x e c u t e :
a d i spl ay cont rol s tep o f caus ing a d i s p l ay apparatu s t o d i spl ay a
f i r s t s creen includ ing a di spl ay i n each o f a p l u ral i ty o f reg ions and a
s econd s creen includ in g a d i s p l ay di f f e r ent f r om the d i s p l ay o f the
f i r s t s c reen;
1 0 a n a c q u i s i t i o n s t e p o f a c q u i r i n g a p l u r a l i t y o f c a p t u r e d ima g e s
that a r e gene rated by captur ing a t a rget whi l e e a ch o f the f i r s t s c reen
and the second s c reen i s di spl ayed; and
a l ivenes s d e t ect ion s t ep o f d e t ermi n ing whether o r n ot the
t a rget i s a l iving bod y u sing a p l u ral i t y o f the capt u red images ,
1 5 wh e r e i n t h e f i r s t s c r e e n i n c l u d e s a t l e a s t two r e g i o n s h a v i n g
di f f e r ent di s p l ays .
[Cl aim 2 ]
The c omput e r - readabl e medium a c c o rding to Cl a im 1 , whe rein a t
2 0 l e a s t two r e g i o n s o f t h e p l u r a l i t y o f r e g i o n s i n c l u d e d i n t h e f i r s t s c r e e n
include: d i s p l ay s with di f f e r ent color s f rom e a ch o the r ; di s p l ay s wi th
di f f e r ent b r ightnes s f rom e a ch o the r ; o r d i f feren t charact er s , symb o ls ,
o r f ig u res f rom e a c h o the r .
2 5 [Cl a im 3 ]
The c omput e r - readable medium according to Cl a im 1 or 2 ,
wherein i n the d i spl ay cont rol s t ep , a boundar y o f the p l u ral i ty o f
region s included in the f i r s t s creen i s d et ermined bas ed o n a p o s i t ional
r el a t ions h i p b etwe e n the d i s p l ay apparat u s and a came r a that gene rat e s
3 0 t h e c a p t u r e d ima g e .
[Cl aim 4 ]
The c omput e r - readable medium according to Cl a im 1 or 2 ,
wherein a boundary o f the p l u ral i ty o f region s included i n the f i r s t
78
s creen i s d e t ermined b y u s er inpu t .
[Cl aim 5 ]
The c omput e r - readable medium according t o an y o n e o f Cl aims 1
5 t o 4 ,
wherein the p ro g ram includes an iden t i f i cat ion model t h at i s
t r ai n ed to outpu t a l abel ind i cat i n g whether o r n ot the t arget shown in
the cap t u red image i s a l i v ing body i n response t o input o f a p l u ral i t y
o f the capt u red images , and
1 0 wh e r e i n i n t h e d i s p l a y c o n t r o l s t e p , wh e t h e r o r n o t t h e t a r g e t i s
a l i v ing body i s d et e rmine d by inpu t t i ng a p l u ral i t y o f t h e capt u red
images acqui red i n t h e acqui s i t i on s t ep i n t o the iden t i f icat ion model
and obt a i n ing the label f rom the ident i f i cat i o n model .
1 5 [Cl a im 6 ]
The c omput e r - readable medium according to Cl a im 5,
whe r e in the ident i f i cat ion model i s t rai n ed us ing b o t h t rai n i n g
dat a o f a pos i t ive exampl e an d t rai n ing d at a o f a negat ive exampl e, and
whe r e in the t rai n ing dat a o f the p os i t ive exampl e includes : a
2 0 p l u r a l i t y o f c a p t u r e d ima g e s o b t a i n e d b y c a p t u r i n g a n ima g e o f a f a c e
of a real p er son whi l e e a c h o f the f i r s t s c reen a nd the s econd s c reen i s
di s p l ayed; and d at a ind i cat i n g that a cap t u red t arget i s a l iving body,
and
whe r e in the t rai n ing dat a o f the negat ive exampl e includes : a
2 5 p l u r a l i t y o f c a p t u r e d ima g e s o b t a i n e d b y c a p t u r i n g a n ima g e o f a f a c e
of a p er son whi l e e a c h o f the f i r s t s c reen a nd the second s c reen i s
di s p l ayed; and dat a ind i cat i n g that a cap t u red t arget i s n ot a l i v ing
body .
3 0 [Cl a im 7 ]
The c omput e r - readabl e medium acco rding t o an y o n e o f Cl aims 1
t o 6 , wherei n in the d i spl ay cont rol s tep , i n t en si ty o f ambi en t l igh t
around the d i s p l ay apparat u s i s de t e rmined, a nd the f i r s t s c reen a nd the
s econd s creen a re d i s p l ayed o n the d i spl ay apparatus when the
79
int en si t y o f the ambi en t l igh t i s equal to o r l es s than a t h resho ld.
[Cl aim 8 ]
The c omput e r - readabl e medium a c c o rding to Cl a im 7 , whe rein in
the d i spl ay cont rol s t ep , when the i n t ens i 5 t y o f t h e amb i e n t l i g h t i s
g reat er than the t h reshold, a me s s age p rompt i n g to move to a loc a t ion
where the ambi ent l ight i s weaker than a c u rren t i n t en s i t y i s output .
[Cl aim 9 ]
1 0 Th e c omp u t e r - r e a d a b l e me d i um a c c o r d i n g t o a n y o n e o f Cl a ims 1
t o 8 , wherei n in the d i spl ay cont rol s tep , i n t en si ty o f ambi en t l igh t
around the d i s p l ay apparat u s i s de t e rmined, and a d i spl ay to b e
included in a t l e a s t one o f the f i r s t s c reen a nd the second s c reen i s
det ermined accor d ing t o the int ens i ty o f the amb i en t l igh t .
1 5
[Cl aim 10]
The c omput e r - readabl e medium acco rding t o an y o n e o f Cl a ims 1
t o 9 , execut ing:
a s econd d i spl ay con t r o l s t ep o f cau s ing the d i s p l ay apparatus t o
2 0 d i s p l a y a g u i d e r e l a t e d t o a d i r e c t i o n o f a l i n e o f s i g h t a n d a g u i d e
rel a t ed to a f a c e d i r e c t ion;
a s econd acq u is i t ion s t ep o f acqui r ing a cap t u red image
gene r a t ed by capt u r i ng the t a rget wi t h the camera a plural i t y o f t imes ;
and
2 5 a s e c o n d l i v e n e s s d e t e c t i o n s t e p o f c omp u t i n g a d i f f e r e n c e
between the f a c e di r e c t ion a nd a l ine- o f- s ight d i rect i o n fo r each o f the
captured image s by u s ing an image o f a f a c e of the t a rget shown i n
each o f the capt u red images , an d det ermi n ing whether o r n o t the t arget
i s a l i v ing b ody bas ed o n the computed d i f f e renc e ,
3 0 wh e r e i n i n t h e s e c o n d d i s p l a y c o n t r o l s t e p , t h e d i s p l a y a p p a r a t u s
i s cau s ed t o d i spl ay a g u ide p romp t ing t o swi n g the fac e l e f t a nd r ight
whi l e a s ame p l a c e i s con t inuous l y v i ewed .
[Cl aim 11]
80
The c omput e r - readable medium according to Cl a im 10, whe r e in
i n the s econ d d i s p lay cont rol s t ep:
a guide p rompt i n g t o d i rect the face in a f i r s t d i rect ion wi thout
moving the l ine of s ight i s d i spl ayed o n the di spl ay apparatus ;
whe the r o r not a f a c e di rect ion o f the t a rget 5 i s t h e f i r s t d i r e c t i o n
i s d e t e rmined; and
when the face di rect i o n o f the t arget i s the f i r s t d i rect ion , the
di s p l ay apparatu s i s cau s ed t o d i spl ay a g u ide promp t ing t o di rect the
face in a s econd di rect ion wi thou t mov i n g the l ine o f s ight .
1 0
[Cl aim 12]
The c omput e r - readable medium according to Cl a im 10 o r 11,
wherein i n the s econ d d i spl ay cont r o l s t ep, i t i s d et ermined whether o r
not a magni tude o f a f a c e swing width o f the t arget i s equal t o o r
1 5 g r e a t e r t h a n a t h r e s h o l d , a n d wh e n t h e ma g n i t u d e o f t h e f a c e swi n g
widt h i s n o t equal t o o r g reat er than the t h reshold, the di s p l ay
apparatu s i s caus ed t o di s p l ay a guide p rompt i n g to swing the face
mor e l a rgely.
2 0 [Cl a im 1 3 ]
The c omput e r - readable medium according to any one o f Cl a ims
10 t o 1 2 , wherein i n the s econ d d i s p lay cont rol s t ep, i t i s det ermined
whether o r n ot speed o f movemen t o f the face o f the t arget i s equal to
or g reat e r than a t h resho ld, an d the d i s p l ay apparatu s i s cau s ed t o
2 5 d i s p l a y a g u i d e p r omp t i n g t o mo v e t h e f a c e mo r e s l owl y wh e n t h e
speed o f movement of the f a c e i s equal to or l e s s than the t h reshold.
[Cl aim 14]
The c omput e r - readable medium according to any one o f Cl a ims
3 0 1 0 t o 1 3 , wh e r e i n i n t h e s e c o n d d i s p l a y c o n t r o l s t e p , i t i s d e t e rmi n e d
whether o r not the l ine- o f - s ight di rect i o n o f the t arget i s f ixed , and the
di s p l ay apparatu s i s cau s ed t o d i spl ay a g u ide p romp t ing n ot to move
t h e l i n e- o f - s i ght d i r ect ion when the l ine- o f - s ight di r ect i on i s n ot f ixed.
81
[Cl aim 15]
The c omput e r - readable medium according to any one o f Cl a ims
10 t o 1 4 , wherein i n the s econ d d i s p lay cont rol s t ep, the d i spl ay
apparatu s i s caus ed t o di s p l ay one o r mo re of a di s p l ay ind i cat in g a
f a c e d i rect ion of the t a rge t , a di s p l ay indi cat 5 i n g a d i r e c t i o n i n wh i c h
the t a rget should d i r e c t the f a c e , a di spl ay i ndi cat i ng t h e l i n e- o f - s igh t
di rect i on o f t h e t a rget , and a d i splay ind i cat in g a d i rect i o n in whi ch
the t arget shou l d d i rect the l ine o f s igh t .
1 0 [Cl a im 1 6 ]
The c omput e r - r eadable medium according to any one o f Cl a ims
10 t o 1 5 , wherein i t i s d et ermined whether o r not a same t a rge t i s
cont inuous ly c a p tured by the c ame r a by u s ing c a p tured images tha t a r e
gene r a t ed by the c ame r a du r i n g t ime f r om a s t ar t o f d i s p l ay ing a s c reen
1 5 i n t h e d i s p l a y c o n t r o l s t e p u n t i l l i v e n e s s d e t e c t i o n i s p e r f o rme d i n t h e
s econd l ivene s s d e t e c t ion s t e p , and
whe r e in p roces s ing i s p er f o rmed agai n f rom the d i s p l ay cont rol
s tep in a c a se whe r e the s ame t a rget i s not c ont inuous ly c a p tured.
2 0 [Cl a im 1 7 ]
The comput e r - readable medium according to Cl a im 16,
whe r e in i t i s d et ermined whether o r n o t the t arget i s shown i n
each o f the c a p tured images by t racking the t a rget , and
whe r e in in a c a se whe r e the c a ptured image in which the t a rge t
2 5 i s n o t s h own i s d e t e c t e d , i t i s d e t e rmi n e d t h a t t h e s ame t a r g e t i s n o t
cont inuous ly c a p tur e d .
[Cl aim 18]
The c omput e r - readable medium according to Cl a im 16,
3 0 wh e r e i n a n ima g e f e a t u r e v a l u e o f t h e t a r g e t i s d e t e c t e d f r om
each o f the c a p tured images , and
whe r e in when the capt u red image no t including the image f e a tur e
value of t h e t a rget i s det ect ed, i t i s det e rmined t h at t h e s ame t a rget i s
no t cont inuously capt u red .
82
[Cl aim 19]
A l ivenes s d et e c t ion apparatu s comp ri s ing:
a di splay cont rol uni t c onf igured to c a u s e a d i spl ay apparat u s t o
di spl ay a f i r s t s c reen inc luding a d i s 5 p l a y i n e a c h o f a p l u r a l i t y o f
region s and a s econd s creen including a d i spl ay di f f e r ent f rom the
di spl ay of the f i r s t s c reen;
an acqui s i t i o n uni t co n figured to acqui re a p l u ral i ty o f capt u red
images tha t a r e gene rated by c a p tur ing a t a rget whi l e e a c h o f the f i r s t
1 0 s c r e e n a n d t h e s e c o n d s c r e e n i s d i s p l a y e d ; a n d
a l ivenes s d e t ect ion uni t con f ig u red to d et ermine whether o r not
the t arget i s a l iving body us in g a p l u ral i t y o f the capt u red images ,
whe r e in the f i r s t s c reen inc lude s a t l e a st two regions having
di f f e r ent di s p l ays .
1 5
[Cl aim 20]
A cont rol method to b e execut ed b y a comput er , the c o n trol
me thod compr i s ing :
a d i spl ay cont rol s tep o f caus ing a d i s p l ay apparatu s t o d i spl ay a
2 0 f i r s t s c r e e n i n c l u d i n g a d i s p l a y i n e a c h o f a p l u r a l i t y o f r e g i o n s a n d a
s econd s creen includ in g a d i s p l ay di f f e r ent f r om the d i s p l ay o f the
f i r s t s c reen;
an acqui s i t i o n s t ep o f acqu i r ing a p l u ral i ty o f cap t u red images
that a r e gene rated by c a p tur ing a t a rget whi l e e a ch o f the f i r s t s c r een
2 5 a n d t h e s e c o n d s c r e e n i s d i s p l a y e d ; a n d
a l ivenes s d e t ect ion s t ep o f d e t ermi n ing whether o r n ot the
target i s a l iving b od y u sing a p l u ral i t y o f the capt u red images ,
whe r e in the f i r s t s c reen inc lude s a t l e a st two regions having
di f f e r ent di s p l ays .
30