Pulnix TM-76 Manual de usuario descargar pdf (Pagina 2)

Operating Modes (Continued)

➊ Standard Interlace Operation

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 expo-

sure 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 (bin-

ning) together and each pair alternates as interlace scan is

generated. In field 1, 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 integra-

tion (1/60 sec) and equals with frame mode (one row at 1/30

sec). Since 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 horizon-

tal pattern is observed. For higher pixel definition such as

gauging and sub-pixel interpolation, Frame mode operation is

recommended.

➋ External Sync

TM-75/TM-76 accepts standard RS-170 external sync, which

is defined as horizontal sync (HD) and vertical sync (VD).The

phase-locked loop jitter is designed to be the minimum (<

5ns) in this category using the latest PLL chip.The wide cap-

ture range enables the camera to operate at an extended tem-

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

is TTL level and the impedance is 75Ω and the trigger input

impedance is 100Ω.

➌ Non-Interlace Operation

With external sync of non-interlace, the camera operates at

non-interlace scanning. External VD must be generated at inte-

ger of 262/312H ± 8H. (Standard interlace is 262.5/312.5 H)

➍ Cyclic (Continuous) Shutter Mode

With in-housing shutter control, the TM-75/TM-76 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 (9.5H from VD edge) decides

the exposure time. (14.5H for CCIR)

➎ External Trigger (Snapshot Shutter) Shutter

By supplying Trigger pulse into pin #9, the camera can be

reset the shutter timing to capture moving objects without

delay.This is similar function as Donpisha Mode.The shutter

pulse is immediately generated from the external trigger with-

out delay.The shutter exposer time is defined between the

external trigger rising edge and internal transfer gate timing,

which is 9.5H (14.5H for TM-76) behind of VD leading edge.

It is effective to be used with Reset-Restart mode.

➏ Reset-Restart Mode

Rather than using VINIT type async reset, the camera can be

asynchronoulsy reset using external VD (RR VD). In this mode,

the camera needs multiple VD pulses to output valid images

depending on whether it is set to Field or Frame Mode.

Usually, the First Field (Field Mode) or the First Frame (Frame

Mode) is unusable because it is the previous signals residual

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

field to capture. External HD must be applied for this opera-

tion. In order to select the Reset-Restart Mode, internal F2

switch is set ON (OFF position is for external VD Reset).

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TM-75/76 High-Resolution CCD Camera

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Odd

Field

Even

Field

Odd Odd OddEven Even Even

Frame Integration

Field Integration

Even

Field

Odd

Field

Even

Field

Odd

Field

EX.TRIGGER

EX.VD

SHUTTER

TRANSFER GATE

EXPOSURE TIME

(no delay from trigger)

Odd

Field

Even

Field

Even

Field

Field Mode

Video

Frame Mode

Video

Field Mode VD

(Min. 2 pulses)

Frame Mode VD

(Min. 4 pulses)

EXT. HD for PLL

Invalid image Invalid image

Invalid images

Good image

(one field only)

Good image

Good images

(one full frame)

(Relationship with HD and Reset-Restart VD affects Odd or Even field output)

Even

Field

Odd

Field

Odd

Field

Odd

Field

Even

Field

Odd

Field

Even

Field

Field Images

(alternate different fields)

1 2 3 4

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