Pulnix TS-9720EN Series Manuel d'instructions télécharger pdf (Page 44)

Page 36

Camera Features

TS-9720EN Series Progressive Scan Shutter Cameras

6 Camera Features

6.1 Progressive scanning

Standard TV-system scanning is 525 lines interlace scanning as specified in the RS-170 protocol. Every

other horizontal line (odd lines and even lines) is scanned at a 60Hz rate per field, and the scanning is

completed with two fields (one frame) at 30Hz rate. Because of the interlace scanning, the vertical

resolution of CCD cameras is limited at 350 TV lines, regardless of the horizontal resolution. When

electronic shutter is applied, the CCD can hold only one field of charge at each exposure. Therefore, the

vertical resolution of the electronic-shutter camera is only 244 TV lines. The situation is the same for an

HDTV-format camera, since it has interlaced scanning and the vertical resolution of the shuttered image

is 500 lines.

The TS-9720EN uses a state-of-the-art progressive scanning interline transfer CCD which scans all

lines sequentially from top to bottom at one frame rate (30Hz). Line a non-interlace computer screen, it

generates a stable, crisp image without alternating lines and provides full vertical TV resolution of 525

lines.

The interline transfer architecture is also important to generate simultaneous shuttering. This is different

from full frame transfer architecture which requires a mechanical shutter or strobe light in order to

freeze the object motion.

6.2 Asynchronous Reset

The video signal starts with internal VD. When the external VINIT pulse is applied, internal VD is

latched to HD and the internal VD is delayed to set up the shutter speed period. The shutter speed is

controlled by the dial switch from “0” to “F.” Video output timing starts right after the internal VD and

single shots, FDV is output at the internal VD timing.

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Pulnix TS-9720EN Series Manuel d'instructions Page 44