Long-Time Store Mode - Hitachi HV-D20P Operation Manual

Long-Time Store Mode

In case that illumination on the subject is insufficient, just increasing the gain of the camera may cause an
increase in noise, resulting in an unclear image. In such a situation, it is advisable to select the long-time
store mode using the external memory. Thereby, the image can be brighter and clearer according to the
stored amount of image.
MODE:FLD/FRM in SUB MENU 1). When one of these image store functions is used, video signal output
is delivered from the camera with the timing shown below.
Since the degree of after-image increases for a moving subject because of image storing, it is recommended
to use the image store function when taking a still picture or scene.
o d d fie ld
E v e n fie ld
V D sig n a l
S to re ch a rg e
o n C C D lin e A
S to re ch arg e
o n C C D lin e B
V id e o sig n a l
W E sig n a l
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This camera is provided with two kinds of image store functions (CCD
F ie ld sto re m o d e
E v e n fie ld
C C D lin e A
C C D lin e B
C C D lin e A
C C D lin e B
S to re tim e : 1 /1 5 s (E x a m p le )
Aa
Ba
Aa+
Ba
I n th e fie ld s to r e m o d e , b o th th e C C D lin e s
A a n d B a re re a d o u t s im u lta n e o u sly. A fte r
co m p le tio n o f sto rin g , vid e o sign a l o u tp u t is
m a d e o n th e n e x t fie ld . Im m e d ia te ly b e fo re
t h e f i e l d o n w h i c h v i d e o s i g n a l o u t p u t i s
m a d e , t h e W E s ig n a l is d e l iv e r e d f r o m t h e
D - S U B c o n n e c t o r e q u i p p e d o n t h e r e a r
p a n e l.
Ab Ac
Bb Bc
Ab+
Bb
Ad
Bd
Ac+
Bc