Image Compression
Module
6
STILL IMAGE
COMPRESSION
STANDARDS
Version 2 ECE IIT, Kharagpur
Lesson
16
Still Image
Compression
Standards: JBIG and JPEG
Version 2 ECE IIT, Kharagpur
Instructional Objectives
At the end of this lesson, the students should be able to:
1. Explain the need for standardization in image transmission and reception.
2. Name the coding standards for fax and bi-level images and state their characteristics. 3. Present the block diagrams of JPEG encoder and decoder.
4. Describe the baseline JPEG approach.
5. Describe the progressive JPEG approach through spectral selection.
6. Describe
the
progressive
JPEG
approach
through
successive
approximation.
7. Describe the hierarchical JPEG approach.
8. Describe the lossless JPEG approach.
9. Convert YUV images from RGB.
10. Illustrate the interleaved and non-interleaved ordering for color images.
16.0 Introduction
With the rapid developments of imaging technology, image compression and coding tools and techniques, it is necessary to evolve coding standards so that there is compatibility and interoperability between the image communication and storage products manufactured by different vendors. Without the availability of standards, encoders and decoders can not communicate with each other; the service providers will have to support a variety of formats to meet the needs of the customers and the customers will have to install a number of decoders to handle a large number of data formats. Towards the objective of setting up coding standards, the international standardization agencies, such as
International Standards Organization (ISO), International Telecommunications
Union (ITU), International Electro-technical Commission (IEC) etc. have formed expert groups and solicited proposals from industries, universities and research laboratories. This has resulted in establishing standards for bi-level (facsimile) images and continuous tone (gray scale) images. In
6
STILL IMAGE
COMPRESSION
STANDARDS
Version 2 ECE IIT, Kharagpur
Lesson
16
Still Image
Compression
Standards: JBIG and JPEG
Version 2 ECE IIT, Kharagpur
Instructional Objectives
At the end of this lesson, the students should be able to:
1. Explain the need for standardization in image transmission and reception.
2. Name the coding standards for fax and bi-level images and state their characteristics. 3. Present the block diagrams of JPEG encoder and decoder.
4. Describe the baseline JPEG approach.
5. Describe the progressive JPEG approach through spectral selection.
6. Describe
the
progressive
JPEG
approach
through
successive
approximation.
7. Describe the hierarchical JPEG approach.
8. Describe the lossless JPEG approach.
9. Convert YUV images from RGB.
10. Illustrate the interleaved and non-interleaved ordering for color images.
16.0 Introduction
With the rapid developments of imaging technology, image compression and coding tools and techniques, it is necessary to evolve coding standards so that there is compatibility and interoperability between the image communication and storage products manufactured by different vendors. Without the availability of standards, encoders and decoders can not communicate with each other; the service providers will have to support a variety of formats to meet the needs of the customers and the customers will have to install a number of decoders to handle a large number of data formats. Towards the objective of setting up coding standards, the international standardization agencies, such as
International Standards Organization (ISO), International Telecommunications
Union (ITU), International Electro-technical Commission (IEC) etc. have formed expert groups and solicited proposals from industries, universities and research laboratories. This has resulted in establishing standards for bi-level (facsimile) images and continuous tone (gray scale) images. In