Pulnix TM-6200 Manual do Utilizador descarregar pdf (Página 2)

Operating Modes

The TM-250NIR/TM-260NIR operates in the following

modes that can be selected by the DIP switch on the rear

panel of the camera.

 Standard Interlace Mode

Field Mode and Frame Mode

The field and frame integration mode is selectable.

Frame integration is used to separate all CCD pixels and

exposure of Odd and Even fields generates the full frame

image shown in the figure below.

Field Mode Binning

Field integration is done by combining two pixel rows

(binning) together, each pair alternating as an 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 nor-

mal 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.

 External Sync Mode

The TM-250NIR/TM-260NIR accepts standard RS-

170 external sync, which is defined as horizontal sync

(HD) and vertical sync (VD). Phase-locked loop jitter

is designed to be the minimum (< 5ns) in this category

using the latest PLL chip. The wide capture range

enables the camera to operate at an extended tempera-

ture range (optional) of -35°C to 65°C. HD and VD input

is TTL level and the high impedance is 100KΩ or 75Ω

(optional).

 Non-Interlace Operation Mode

With external sync of non-interlace, the camera oper-

ates at non-interlace scanning. External VD must be

generated at integers of 262H ± 8H. (Standard interlace

is 262.5 H)

 Cyclic (Continuous) Shutter Mode

With back-plate shutter control, the TM-250NIR/

TM-260NIR operates at the internally predefined shutter

speeds. Each field output is exposed for the same peri-

od. 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 JAI PULNiX for timing charts of various cyclic

shutter modes.

 Asynchronous Reset & 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.

The following four asynchronous shutter modes are

available:

• Strobe Asynchronous Shutter Mode

• Pre-Reset Asynchronous Shutter Mode

• Post-Reset Asynchronous Shutter Mode

• Pulse Width Asynchronous Shutter Mode

Please contact JAI PULNiX for timing charts of various asyn-

chronous shutter modes.

 Reset-Restart Mode

Rather than using VINIT as async reset, the camera

can be reset using EXT. VD. In this mode, the camera

needs multiple VD pulses to output valid images depend-

ing on whether it is set to Field or Frame mode. Usually,

the first field (field mode) or first frame (frame mode)

is garbage because of previous signal residuals prior to

reset. A frame grabber has to know which frame or field

to capture. External HD must be applied for this

operation.

 Reset-Restart with Electronic Shutter

The shutter speed or exposure can be controlled with

external pulse width control or external pulse position

control in this mode. In combination with Reset-Restart

pulse (EXT. VD), the camera can be externally controlled

for the image-capture timing as well as the exposure

time.

This is an excellent application for capturing multiple

images (two fields of images) of indexing objects under

various lighting or brightness conditions. When Frame

mode is selected, the full vertical resolution is achieved

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Frame Integration

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