Microscan MS-Q Imager Bedienungsanleitung Seite 122

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7-2 MS-Q Imager User’s Manual
Dual Optics
Dual Optics
The MS-Q Imager’s dual field optical system can read small 2D symbols as well as
larger 1D symbols. It decodes the near and far fields simultaneously. The near field lens is
for smaller symbols (optimal focal point: 4 inches) and the far field lens is for larger symbols
(optimal focal point: 9 inches). Move the MS-Q closer to read smaller symbols and farther
away to read larger symbols. The full MS-Q decode zone is 2 inches to 20 or more inches.
SXGA (Megapixel) Imaging Area
VGA Imaging Area
Important: VGA is only supported in Rev 5 hardware and earlier.
Far Field
Near Field
1024
640
640
(1280)
In standard SXGA mode, the megapixel
optics are divided into far and near
field decode zones. Each decode
zone is 1024 x 640 pixels. This mode
has the highest resolution and provides
the widest working range for decoding
1D and 2D symbols of all densities.
Image processing time is slightly
greater if the entire area (1280 x 1024)
is used, but various adjustments can
significantly reduce processing time.
If only near field is used (smaller,
denser symbols), the far field image
can be ignored. If only far field is used
(larger, less dense symbols), the near
field image can be ignored.
Image processing time can be reduced
still further by specifying a Select
Region of Interest within the imaging
area (page 7-4).
Far Field
Near Field
480
320
320
(640)
In VGA mode, the imager’s 1.3 million pixels are sampled on a 4-to-1
basis. This pixel sampling dramatically reduces image processing time.
Because a VGA image is created by pixel sampling, its resolution is not
as high as that of an SXGA image.
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