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POWERSCAN® D8530
8
2.3.2 Advanced Configuration Parameters
By default, for all Image Presets, the window has its origin coordinates equal to zero,
its width equal to 1280 pixels and its height to 1024 pixels.
Brightness Adjustment is available in the range from –100% up to 100%, in steps of
1%. Positive values shift the luminance up so that the image will result brighter.
Default value is 0%, meaning that no brightness adjustment is performed.
The same range of values (–100% up to 100%, in steps of 1%) is available for
Contrast Adjustment. Positive values will increase the contrast, so that dark and
bright objects inside the image will be better distinguishable. Default value is 0%,
which means that no contrast adjustment is performed.
You can set the Image Color Depth by selecting 256 gray levels (default), 16 gray
levels, or 2 gray levels. Higher color depths yield larger image files. This option is
ignored if the JPEG format is selected,(256 gray levels only).
2.4 AUTOSCANNING
2.4.1 Normal Mode
PowerScan® D8530 provides an autoscan command (see page 73), which when
enabled, causes the reader to scan continuously and to monitor the central zone of
its reading area. In this way, PowerScan® D8530 is ready to capture any image
(containing a potential code) positioned on a uniform background.
The aiming system can be enabled to indicate the reading area of the potential code
to be captured. The illumination system can also be enabled when the ambient light
conditions are not sufficient to autodetect the potential code to be captured;
furthermore, the illumination system increases in intensity for an instant when
capturing and decoding an image. A safety time may be defined to prevent
PowerScan® D8530 from reading the same code repeatedly.
If the decoding is completed successfully, the reader starts monitoring the reading
area again. In case of decoding failure, PowerScan® D8530 keeps on decoding until
a potential code is present in the central zone of the reading area.
2.4.2 Pattern Mode
The Autoscan pattern mode is particularly advised when reading barcodes positioned
on a non-uniform background. In these cases PowerScan® D8530 may perceive
some elements of the background as barcodes and start the decoding. To avoid this