GR-DVL9600 GR-DVL9500 - JVC
GR-DVL9600 GR-DVL9500 - JVC
GR-DVL9600 GR-DVL9500 - JVC
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Description of Progressive Scan CCD<br />
EN23<br />
Progressive Scan is a special image sensing method which, unlike conventional interlace scanning, is able to<br />
pick up all the lines of picture information in one Scan. Since the Progressive Scan CCD is capable of<br />
outputting 50 full Frames* per second — twice the amount of conventional systems — it is able to deliver a<br />
high quality picture even when its output signal is converted to a format that can be viewed on a TV screen.<br />
*A PAL TV screen image is composed of 25 Frames per second. 1 Frame is made up of 2 Fields.<br />
Scan A<br />
1 Frame<br />
Scan B<br />
1. Regular shooting of moving images<br />
Records 25 odd and 25 even image Fields, for a total of 50<br />
per second. Since there is a time lag between an odd and<br />
even Field, when they are combined to make 1 Frame the<br />
part of the image that is moving appears as image jitter.<br />
However, during normal playback, the moving picture<br />
looks smooth and natural.<br />
2. Progressive mode shooting of moving images (Progressive Mode Recording pg. 22)<br />
Scan A is recorded, divided into an odd- and even-number Field, and then Scan B is skipped. Scans C and D<br />
are handled in the same way as Scans A and B, as illustrated below, thereby recording 25 Frames per second.<br />
Since each recorded odd- and even-number Field originates from the same Scan there is no time lag between<br />
them, and so when they are combined into a Frame and a still image is displayed on a TV or PC monitor the<br />
picture does not look jittery. However, when moving images are played back, the picture can look unnatural.<br />
Scan A<br />
Scan B<br />
Scan C<br />
Scan D<br />
Skip<br />
Skip<br />
Odd-number<br />
Field<br />
Even-number<br />
Field<br />
Odd-number<br />
Field<br />
Even-number<br />
Field<br />
25 Frames per second