JPEG2000

This project aims to primarily implement decoding of the JPEG 2000 ISO 15444 Part 1 Core coding system.

Progress

JP2 container

Decoding of ISO 15444 Part-1 JP2 file format, Annex I, is mostly complete, unless there are bugs. Encoding is not started. Improvements in performance and robustness of conformance checks can be made.

Decoding

• Signature box I.5.1 (100%)
• File type box I.5.2 (99%)
• JP2 header box I.5.3. (99%)
  • Image Header box I.5.3.1 (99%)
  • Bits Per Component box I.5.3.2 (100%)
  • Colour Specification box I.5.3.3 (100%)
  • Palette box I5.3.4. (100%)
  • Component Mapping box I.5.3.5 (100%)
  • Channel Definition box I.5.3.6 (99%)
  • Resolution box I5.3.7 (100%)
  • Capture Resolution box I.5.3.7.1 (100%)
  • Default Display Resolution box I.5.3.7.2 (100%)
  • Contiguous Codestream box I.5.4 (100%)
  • Intellectual Property box I.6 (100%)
  • XML box I.7.1 (100%)
  • UUID box I7.2 (100%)
  • UUID Info box I7.3 (100%)
  • UUID List box I.7.3.1 (100%)
  • URL box I.7.3.2 (100%)

Codestream

Decoding of ISO 15444 Part-1 Codestream, Annex A, is in progress. Encoding is not started.

Decoding

• Start of codestream A.4.1 SOC (100%)
• Start of tile A.4.2 SOC (50%)
• Start of data A.4.3 SOD (100%)
• End of codestream A.4.4 EOC (100%)
• Image and tile size SIZ A.5.1 (90%)
• Coding style default COD A.6.1 (90%)
• Coding style component COC A.6.2 (90%)
• Region of interest RGN A.6.3 (90%)
• Quantization default QCD A.6.4 (90%)
• Quantization component QCC A.6.5 (90%)
• Progression order change POC A.6.6 (90%)
• Tile-part lengths TLM A.7.1 (90%)
• Packet length, main header PLM A.7.2 (80%)
• Packet length, tile-part header PLT A.7.3 (90%)
• Packed packet headers, main header PPM A.7.4 (10%)
• Packed packet headers, tile-part header PPM A.7.5 (15%)
• Start of packet SOP A.8.1 (0%)
• End of packet header EPH A.8.2 (0%)
• Component registration CRG A.9.1 (90%)
• Comment COM A.9.2 (90%)

JPXML

Encoding of JP2 and JPC into ISO 16444 Part-14 XML representation. This is mostly used for debugging purposes.

Encoding

ICC

ICC support is needed as an embedded colourspace which contains a restricted subset of ICC Input and Display profiles can be used. Current support is minimal to allow further decoding of the JP2 file format. See ISO 15444-1 I.3.2 and ISO 15075-1.

Arithmetic entropy coding

Started but redumentary implementation, see Annex C

Quantization

Not started, see Annex E

Discrete wavelet transformation of tile-components

Not started, see Annex F

DC level shifting and multiple component transformations

Not started, see Annex G

TODO

• add tests
• add benchmarks
• add fuzzing