JPEG2000 LIBRARY
Overview
Image encoding process
can be represented as shown in fig.1. It consists of five main stages:
input image processing, multi-component transform, wavelet transform,
tier-1 and tier-2 processing and output file generation.
The Input unit performs
input image file reading and decoding. This module actually should
be considered as an interface module and should not be treated as
a part of JPEG2000 encoder.
Current version of encoder
supports the following list of input image formats:
- Grayscale images
(8 bits per pixel, 256 levels of gray)
- Color RGB images
(24 bits per pixel)
- Color YUV 4:4:4 images
(24 bits per pixel)
- Color YUV 4:2:2 images
(24 bits per pixel)
- Color YUV 4:2:0 images
(24 bits per pixel)
The Multi-component transform module supports
converting of input RGB image into YCrCb color space when used with
9/7 filter (Irreversible Color Transform), and into the special
color space (Reversible Color Transform, see ISO_IEC_15444-1 2000(E))
when used with 5/3 filter. For grayscale and color YUV images the
MCT encoding stage is omitted.
The Discrete wavelet transformation module
supports both standard wavelet filters recommended by ISO JPEG2000
– reversible 5/3 and irreversible 9/7.
The Tier-1 module provides encoding of
resulting DWT coefficients with dynamic rate allocation control.
Tier-1 uses original Passes allocation algorithm and implements
single-pass-fidelity allocation method.
The Tier-2 module performs zero-tree encoding
and JPEG2000 final output stream generation.
The Output module provides the output interface
and, as the input module, does not belong to the JPEG2000 encoding
algorithm.
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