Pulnix TM-76 Bedienerhandbuch PDF herunterladen (Seite 16)

Page 10

Operation

TM-75/76 High-Resolution CCD Camera

FIGURE 3. Field/Frame Diagram

3.1.3 (a) Field Mode

In Field mode, two horizontal rows are scanned 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 separately, Field mode obtains the

same sensitivity in half the time period. 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.

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.

Note: 1. Since only one ﬁeld are output in the Field mode, it cannot provide full frame resolution

in strobe lighting applications.

2. The TM-76(CCIR) is 1/50 sec. for Field and 1/25 sec. for Frame mode.

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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