JVC GR-DLS1, Instructions Manual

Page: 32 / 92

32
EN
RECORDING
Advanced Features (Cont.)
Description of Progressive Scan CCD
Progressive Scan is a special image sensing method which, unlike conventional interlace scanning, is able to
pick up all the lines of picture information in one Scan. Since the Progressive Scan CCD is capable of
outputting 60 full Frames* per second — twice the amount of conventional systems — it is able to deliver a
high quality picture even when its output signal is converted to a format that can be viewed on a TV screen.
* A NTSC TV screen image is composed of 30 Frames per second. 1 Frame is made up of 2 Fields.
1. Regular shooting of moving images
1 Frame
Scan B Scan A
Odd-number Field Even-number Field
Scan A Scan B
Skip
Scan D
Odd-number
Field
Odd-number
Field
Skip
30 Frames per second
Records 30 odd and 30 even image Fields, for a
total of 60 per second. Since there is a time lag
between an odd and even Field, when they are
combined to make 1 Frame the part of the image
that is moving appears as image jitter. However,
during normal playback, the moving picture looks
smooth and natural.
2. Progressive mode shooting of moving images
(Progressive Video Recording
Z
pg. 46)
Scan C
Scan A is recorded, divided into an odd- and even-number Field, and then Scan B is skipped. Scans C and
D are handled in the same way as Scans A and B, as illustrated above, thereby recording 30 Frames per
second.
Since each recorded odd- and even-number Field originates from the same Scan there is no time lag
between them, and so when they are combined into a Frame and a still image is displayed on a TV or PC
monitor the picture does not look jittery. However, when moving images are played back, the picture can
look unnatural.
3. Pro Snapshot recording (
Z
pg. 30)
When the Progressive button is pressed, the current frame will be recorded for about 6 seconds in the
Progressive mode (except when Multiple picture mode and Color bar mode are being used).
Even-number
Field
Even-number
Field