Opticon LG2 Series, Руководство пользователя

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LG2 User’s Manual 25-ULG2MU01-02 - 4
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LG2 User’s Manual 25-ULG2MU01-02 - 5
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1.4 - Imager Field of View & Resolution (con’t)
If only the near field is used (small, high density symbols), the far field image can be ignored. If only
the far field is used (large, lower density symbols), the near field can be ignored. Further optimization
may be obtained by "windowing" the field to a smaller area. Each focal area may be narrowed by
enabling the windowing feature found in section 9.3.
VGA Mode: In VGA mode (optional selection), the 1.3 Million Pixels are sampled on a 4-to-1 basis.
This greatly reduces the amount of time necessary for the transfer of the image to the CPU and the
resulting processing time (figure 1.5). The trade-off for this increased speed is a reduction in resolution
and working range.
Figure 1.4
640
1024
Far
Near
640
320
480
Far
Near
320
Figure 1.5
SXGA
Imaging Area
VGA
Imaging Area