45-11Vision and Image Sensors
e requirement for an external shutter is greatly reduced in the frame-transfer CCD sensor by the
pr
ovision
of a li
ght-shielded
sto
rage
se
ction
in
to
wh
ich
th
e
en
tire
2-
D
im
age
ch
arge
is sh
ied
at a mu
ch
hi
gher
ra
te
(l
imited
pr
imarily
by CT
E
co
nsiderations)
th
an
is po
ssible
in a fu
ll-frame
CC
D
. e ch
arge
ca
n
th
en
be re
ad
fr
om
th
e
sto
rage
re
gion
du
ring
th
e
ne
xt
in
tegration
pe
riod
wi
thout
an
y
fu
rther
im
age
sm
earing
. So
me
se
nsors,
su
ch
as th
e
EG
&G
Re
ticon
RA
1102
de
vices,
ha
ve
th
e
sto
rage
ar
ea
di
vided
in
to
ha
lves
pl
aced
on op
posite
sid
es
of th
e
im
aging
ar
eas
. i
s
im
proves
pe
rformance
by ha
lving
th
e
ma
ximum
nu
mber
of tr
ansfers
re
quired
to re
ach
th
e
ne
arest
sto
rage
re
gion
. e sa
me
re
duction
oc
curs
automatically in sensors ...