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How do you decode/decompress JEDMICS CCITT4 Graphics format?
1st question: I have some data files that are supposedly JEDMICS CCITT4. But I can't find a method of decoding or decompressing JEDMICS CCITT4, although I've seen people mention decoding TIFF CCITT4.
2nd question: Actually, I'm not even sure what CCITT4 compression does. Does it break the image up into smaller chunks?
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by: breadtanPosted on 2009-08-29 at 06:33:13ID: 25213999
First of all, you should read this paper
- https://www.jedmics.net/op
1st question: I have some data files that are supposedly JEDMICS CCITT4. But I can't find a method of decoding or decompressing JEDMICS CCITT4, although I've seen people mention decoding TIFF CCITT4.
[ans]
> Good intro on JEDMICS, see http://www.opengroup.org/p
> Data Interchange - In JEDMICS, drawings are input to the system and output from the system in C4 format, which is a tiled, CCITT Group IV bitmap encoding format service. The Data Interchange services convert the bitmap from various scanned formats into C4 format and convert from C4 format to bitmap data that can be sent to common data output devices like printers and CRT screens.
> you can check out http://www.trixsystems.com
>After looking much in the web, I do not see value of decompressing it. It is typically converted to other format for further manipulation. IMO, so rather than trying to decompress, look into converting instead.
> Check out http://www.sfaxtools.com/o
2nd question: Actually, I'm not even sure what CCITT4 compression does. Does it break the image up into smaller chunks?
[ans]
- There is one and two dimensions scheme, they used huffman encoding (modified). In simplicity, it does not 'really' break up to chunks but having scanning line by line on the data to come up with codes representation. It is encoded based on tile (512x512 pixel) information.
Extract:
A C4 image is segmented and stored as a collection of 512 by 512 pixel tiles, each of
which is individually compressed, using CCITT Group 4 encoding, as though it were an
independent image. If the tile exhibits a negative compression characteristic (i.e. the
CCITT Group 4 compressed tile is larger then the raw pixel tile), then tile is stored as a
raw pixel tile and the negative compression flag for the tile is set in the C4 Tile Index.
Other references
- For more info on C4, see this book chapter 3.1 with search finds included .
- http://books.google.com.sg