Microscan MS-4X User Manual download pdf (Page 367)

MS-4X Imager User Manual

A-33

Appendices

Bit Stream Method

A more difficult method is to parse and decode the bit stream data. The bit stream is a mix

of EXIF format & TIFF format. You will need to use the <op,4> command.

<op,4,arg>

To load a bitmap, send <op,4> and the entire grayscale image will load.

To load a JPEG, set arg for the full-size JPEG image, with adjustable quality:

<op,4,1280x1024_qnnn.jpg>

There is only one variable: nnn is a number from 1 to 100, and it represents the image

quality. 1 will load fastest, but will be extremely low-quality. 100 will load slowly, but will be

highest-quality.

<op,4,1280x1024_q1.jpg> = low-quality image, short load time

<op,4,1280x1024_q100.jpg> = high-quality image, long load time

Response Format

The user will need to write an application that can receive the image (8-bit format – 7 data

bit communication will not work), split up the data, and write the file. The data is format info

and then image data, so an ASCII terminal will not work.

The format of the data will be (_ added for readability):

SOH_DATALEN_FRAMETYPE_SCHEMA_DATA_CRC

SOH = SOH character

DATALEN = the length of data to follow, 32 bit integer from ‘00000000’ to ‘FFFFFFFF’

FRAMETYPE = 1

SCHEMA = 2

DATA = image data

CRC = CRC16 check digit at the end includes SOH, and everything after,

except the CRC

More information on these formats is available at:

http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf

and

http://www.exif.org/specifications.html

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Microscan MS-4X User Manual Page 367