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In order to obtain the ideal image quality and speed for barcode detection, it is recommended that the
settings of the image filters be adjusted while scanning a test document.
2.5.2 Deskew
This function corrects the skew in scanned images by restoring the images to the upright position.
Deskewed images (text or graphics) may appear serrated. To correct this, select the
Smooth
check box.
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Note
If there is any foreign matter on the reference plate or flatbed sheet when documents are scanned,
dark areas may appear around the document edges. If this happens, clean the reference plate or
flatbed sheet.
2.5.3 Patchcode Detection
For information on the Patchcode Detection property, refer to your application’s user manual or the
VRS
User’s Manual
.
2.5.4 Image Scaling
For information on the Image Scaling property, refer to your application’s user manual or the
VRS User’s
Manual
.
Property
Description
Types section
If the barcode type is known ahead of time, clear the check boxes at the
sides of the barcode types which will not be used. The fewer barcodes
selected, the faster the processing.
Patch Code
The data does not appear as ASCII character strings with some barcode
types such as Code128. Special characters are used for Code39 and other
barcode types. When the Decode Symbol option is selected, the data of
these barcodes is changed into readable ASCII character strings.
Note:
It is recommended that Decode be enabled unless it is clear that the
barcode detection results must not be converted into ASCII character
strings.
Limits
Set to string length if the length of the barcode character string is known
ahead of time. The recognition accuracy and speed can be improved by
specifying this length.
Search Directory
This is specified if the position of the barcode to be detected is known
ahead of time. The recognition accuracy and speed can be improved by
specifying the barcode position.
Table 5: Barcode Properties