FIXIt

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FIXIt!
Università di Roma La Sapienza Dipartimento
Informatica
Centro Fotoriproduzione Legatoria e Restauro

• Franco Liberati
• liberati_at_di.uniroma1.it

Paolo Buonora paolo.buonora_at_beniculturali.it
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File Format JPEG2000Introduction

• JPEG2000 format presents two different level of
  sintax
• File Format
• Code Stream
• JP2 file features
• Allows storing application specific data with
  JPEG 2000 code stream
• Specifies image properties
• Color-Space of the image
• Intellectual Property Rights
• Metadata can be accessed without decoding the
  image

Conceptual JPEG2000 format
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File Format

• Specifies additional information Color Space,
  Ownership,
• Box Basic building block
• File a sequence of Boxes

JPEG 2000 Signature Box
File Type Box
JPEG Header Box
Image Header Box
LBOX
TBOX
XLBOX (if required)
DBOX
Color Specification Box
Contiguous Code Stream Box
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Code Stream
Main Header

• Marker Segment basic building block
• Code Stream a sequence of marker segments and
  data

SOC Marker Segment
SIZ Marker Segment
TYPE
LENGTH (if required)
Parameters (if required)
Other Marker Segment (COD COC QCD QCC RGN,)
Tile-Part Header
SOT Marker Segment
Other Marker Segment (COD COC QCD QCC RGN,)
SOD Marker Segment
Tile-Part Body
Packet Data
Main trailer
EOC Marker Segment
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File Format JPEG2000Sample

• The code stream has a main header at the
  beginning that describes the original image and
  the various decomposition and coding styles that
  are used to locate, extract, decode and
  reconstruct the image with the desired
  resolution, fidelity, region of interest and
  other characteristics
• The optional file format describes the meaning of
  the image and its components in the context of
  the application

Binary and ASCII representation of image file
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File Format JPEG 2000Sample
HEADER
IMAGE CODING
Binary and ASCII representation of image file
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FixIt!Introduction

• FixIt! software tests and repairs JPEG2000 image
• Functionalities
• Save Haeder JPEG 2000
• Test corrupted file
• Fix corrupted file
• Developments
• Save code stream marker
• Save significant tile
• Batch modality

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FixIt!Sample

• Operative mode
• Load JPEG2000 image
• Select Folder Header
• Extract JPEG 2000 header from file and copy it in
  Folder Header
• Load JPEG2000 image
• Select Folder Header
• Test integrity
• Replace correct header in old file

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FixIt!Contacts

• Testwww.cflr.beniculturali.it/Progetti/FixIt.html
  
• Submit information liberati_at_di.uniroma1.it
• paolo.buonora_at_beniculturali.it