Pulnix TM-250 Instrukcja Obsługi Pobierz pdf (Strona 20)

Page 14

Operation

TM-250 Miniature CCD Camera

• Reset-Restart Mode

Frame Integration Mode

Field Integration Mode

• Reset-Restart Mode with Electronic Shutter

Frame Integration Mode

Field Integration Mode

• Integration Mode (Strobe application)

3.3.1 Standard Interlace Mode

3.3.1 (a) Field Mode and Frame Mode

The ﬁeld and frame integration mode is selectable. The frame integration is used to separate all CCD

pixels and the exposure of Odd and Even ﬁelds generate the full frame image shown in the ﬁgure below.

3.3.1 (b) Field Mode Binning

The ﬁeld integration is done by combining two pixel rows (binning) together, each pair alternating as

interlace scan is generated. Row 1 is binned with row 2, and row 3 is binned with row 4. In Field 2, row

2 is binned with row 3, row 4 with row 5, and so on. Field mode is very effective in shutter mode

because the pixel sensitivity is doubled for ﬁeld integration (1/60 sec) and equals frame mode (one row

at 1/30 sec). Because Shutter mode is only one ﬁeld output per shutter and darker than normal image,

two-row binning is effective. This mode also reduces interlace moire when a sharp horizontal pattern is

observed. For higher pixel deﬁnition such as gauging and sub-pixel interpolation, Frame mode

operation is recommended.

3.3.2 Cyclic (Continuous) Shutter Mode

With back-plate shutter control, the TM-250 operates at the internally predeﬁned shutter speeds. Each

ﬁeld output is exposed for the same period. The shutter control varies the substrate discharge timing.

The duration between the shutter pulse and transfer gate timing (11H from VD edge) decides the

exposure time (16H for CCIR). The following three cyclic shutter modes are available:

• High-Speed Cyclic Shutter mode

• Trigger Position Reset/Restart Shutter mode

• Trigger Width Reset/Restart Shutter mode

Contact PULNiX for timing charts of various cyclic shutter modes.

3.3.3 Asynchronous Reset and Asynchronous Shutter

By supplying VINIT pulse on pin #6, the camera can be reset asynchronously. In this mode, when

VINIT is kept high, it continuously discharges the CCD and outputs the ﬁeld video signal upon the

negative going edge. The output stays continuous during VINIT low. The ﬁrst ﬁeld output is always

Odd.

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