Code Alarm CR3 Manual do Utilizador descarregar pdf (Página 51)

V002450_25_CR1200-CR2-CR3-CR2500-CR3500_Interface_Configuration_Document_CLIENT.docx

2011-04-27 Page 51 of 65

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14870 S. Pony Express Rd., Suite 200, Bluffdale, UT 84065

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(801) 495-2200

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FAX (801) 495-0280

characters from the checksum to the first character of a single row in a template. A block checksum

provides a checksum from its character position all the way to the first character of the overall template.

For additional checksum protection, four different weighting schemes are supported: 1, 12, 13, and 137.

Finally, the checksum calculation is based on modulo arithmetic. The modulo factor may vary from 6 to

36.

The OCR decoder is designed to read OCR text that is within a certain sampled range in pixels. The

ideal height of an OCR character after sampling is about 20 pixels. The OCR decoder will read

characters that are up to 50 pixels in height. If OCR characters are consistently above 40 pixels in

height, down sampling the image by a factor of 2 before submitting it to OCR decoder will achieve

better results in both speed and decode rates.

12.3 OCR Output String Values

There is no 7 bit ASCII representation for the Euro, Pound, or Yen currency characters. The 8 bit values

that are returned in the result string for these characters are based on the typical code page values used in

Windows. The 8 bit codes used are as follows:

Character Value

€ - Euro 128

£ - Pound 163

¥ - Yen 165

12.4 OCR User Templates

User Templates are NULL terminated strings made up of various control codes along with standard

ASCII values. The control codes are assigned to ASCII values below the value of 32. The currently

defined control codes are:

Control Code Definition

Value

Argument

End of Template

New Template

Font [1-3]

New Line

Define Group Start

ID [1-255]

Define Group End

Wildcard: Numeric (0-9)

Wildcard: Alpha (A-Z)

Wildcard: Alphanumeric

Wildcard: Any (including space)

Defined Group

ID [1-255]

In Line Group Start

In Line Group End

Checksum

Weights, Type,

MOD

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 64 65

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