# RE: Getting compressed B/W image data from Fujitsu M3096GXm scann er

From: Armistead, Jason (armistej@oeca.otis.com)
Date: Sun Feb 04 2001 - 15:53:44 PST

- Next message: Armistead, Jason: "RE: Getting compressed B/W image data from Fujitsu M3096GXm scann er"
  - Previous message: Heikki Kantola: "SANE 1.0.4 and SnapScan library problems"
  - Next in thread: Armistead, Jason: "RE: Getting compressed B/W image data from Fujitsu M3096GXm scann er"
  - Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

  Hi Peck

  Product documentation for all the Fujitsu scanners can be found at

  http://www.fujitsu-europe.com/home/documentation.asp?osc=fel&lang=en&cat=9

  which has PDF files of the OEM manuals which contain the SCSI specific
  sequences for the M3096GX family.

  Since I'm not a SCSI guru yet, though I am learning, any help is definitely
  appreciated.

  As far as technical specifications of the compression board go, it basically
  allows the following:

  MH (Modified Huffman) = CCITT Group 3 1D
  MR (Modified READ) = CCITT Group 3 2D (specify K factor)
  MMR (Modified Modified READ) = CCITT Group 4 2D

  using the SET WINDOW SCSI command and specifying a non-zero value for the
  compression type byte 0x20 (MR = 1, MR = 2, MMR = 3 as per SCSI scanner
  spec), and for MR compression, using the compression argument byte 0x21 to
  specify the K factor.

  I have just had a look at Tom Martone's sane-bh patches for the Bell &
  Howell COPISCAN family and it looks like that's pretty close to what I want
  to do in terms of MH, MR and MMR compression. I'll have a look at it and
  see if I can fuse it back into the M3096G driver.

  Regards

  Jason

  -----Original Message-----
  From: Peck Dickens [mailto:peck_d@bellsouth.net]
  Sent: Friday, 2 February 2001 18:18
  To: sane-devel@mostang.com
  Subject: Re: Getting compressed B/W image data from Fujitsu M3096GXm
  scanner

  On Fri, 02 Feb 2001, you scribbled:

  > Any ideas, suggestions ? Sample code (or attempts at it) most welcome ...

  Do you have the technical specifications for the compression board from
  Fujitsu?
  That's where you have to start... Once you get that, implimenting
  compression
  is possible.

  I would be willing to work with you on this in the event you are interested.

  Best

  M. Peck Dickens

  System stats: 2:16am up 1 day, 10:30, 3 users, load average: 0.27, 0.38,
  0.46

      --
      Source code, list archive, and docs: http://www.mostang.com/sane/
      To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com
      --
      Source code, list archive, and docs: http://www.mostang.com/sane/
      To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com

  - Next message: Armistead, Jason: "RE: Getting compressed B/W image data from Fujitsu M3096GXm scann er"
  - Previous message: Heikki Kantola: "SANE 1.0.4 and SnapScan library problems"
  - Next in thread: Armistead, Jason: "RE: Getting compressed B/W image data from Fujitsu M3096GXm scann er"
  - Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

  This archive was generated by hypermail 2b29 : Sun Feb 04 2001 - 21:56:06 PST