Long-Time Store Mode - Hitachi HV-D27 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. This camera is provided with two kinds of
image store functions (CCD 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.
Field store mode
Even field
CCD line A
CCD line B
odd field
CCD line A
Even field
CCD line B
Store time: 1/15 s (Example)
VD signal
Store charge
on CCD line A
Store charge
on CCD line B
Video signal
WE signal
Frame store mode
Even field CCD line A
CCD line B
Odd field
CCD line A
Even field
CCD line B
Odd field
Store time: 1/15 s (Example)
VD signal
Store charge
on CCD line A
Store charge
on CCD line B
Video signal
WE signal
In the field store mode, both the CCD lines A
and B are read out simultaneously. After
completion of storing, video signal output is
made on the next field. Immediately before
the field on which video signal output is
made, the WE signal is delivered from the
MULTI connector equipped on the rear panel.
In the frame store mode, each of the CCD
lines A and B is read out individually.
Therefore, the vertical resolution is superior.
After completion storing, video signal output
is made between two fields. Immediately
before the field on which video signal output
is made, the WE signal is delivered from the
MULTI connector equipped on the rear
panel.
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