Pulnix TM-250 Manual de Instruções descarregar pdf (Página 17)

Page 11

Operation

TM-250 Miniature CCD Camera

3.1.3 Field and Frame Modes

The standard factory setting for the TM-250 camera is FRAME MODE. The ﬁeld and frame integration

mode is selectable using the switch on the rear panel of the camera. The frame integration is used to

separate all CCD pixels. The exposure of Odd and Even ﬁelds generates the full frame image shown in

the ﬁgure below.

3.1.3 (a) Field Mode

In Field mode, two horizontal rows are scanned (binned) simultaneously. At each interlace scan, the

scanned pairs are changed. Thus the sensitivity of the CCD is doubled for one ﬁeld of integration. When

compared to Frame mode, in which each horizontal row is scanned simultaneously, the CCD obtains the

same sensitivity in half the time period. This mode is useful when Shutter is used. The ﬁeld integration

is done by combining two pixel rows (binning) together and each pair alternates 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. The ﬁeld mode is very effective in shutter mode since the pixel

sensitivity is doubled for ﬁeld integration (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 horizontal pattern is observed. For

higher pixel deﬁnition such as gauging and sub-pixel interpolation, Frame mode operation is

recommended.

Moire is unnoticeable because of alternating two-row scanning. The vertical resolution in Field mode is

not as good as that in Frame mode, but it is sufﬁcient to view the full vertical resolution of the TV

format.

3.1.3 (b) Frame Mode

In Frame mode, each horizontal row is scanned as interlace scanning. The integration of each pixel is

one frame period. In Frame mode, vertical pixel resolution is good, and the exact location is obtained. In

comparison with Field mode, however, Frame mode has the disadvantage of showing vertical Moire.

Frame mode should be used in applications that need strobe lighting, because full frame resolution is

achieved in this mode. For higher pixel deﬁnition such as gauging and sub-pixel interpolation, Frame

mode operation is recommended.

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Odd Odd OddEven Even Even

Frame Integration

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