April 2019
Intermediate to advanced
624 pages
16h 54m
English
Content preview from Discrete Wavelet Transformations, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 12THE JPEG2000 IMAGE COMPRESSION STANDARD
In 1992, JPEG became an international standard for compressing digital still images. JPEG is the acronym for the Joint Photographic Experts Group formed in the 1980s by members of the International Organization for Standardization (ISO) and the International Telecommunication Union (ITU). The JPEG compression standard remains very popular. According to a survey posted on www.w3techs.com [90] in March 2017, 73.9% of all websites use JPEG images1 are stored using it. Despite the popularity of the JPEG standard, members of JPEG decided the algorithm could be improved in several areas and should be enhanced so as to meet the growing needs of applications using digital images. In 1997, work began on the development of the improved JPEG2000 compression standard. The core system of the JPEG2000 compression method is now a published standard [60] by the ISO (ISO 15444). Unfortunately, JPEG2000 is not supported by web browsers such as Mozilla Firefox or Google Chrome although some software programs, such as Adobe Photoshop allow users to save images in the JPEG2000 format. While JPEG2000 is a marked improvement over JPEG, it has not caught on as a popular way to perform image compression. Nonetheless, it is an important application of the biorthogonal wavelet transformation and thus covered in this chapter.
One of the biggest changes in the JPEG2000 standard is that the biorthogonal wavelet transformation replaces the discrete cosine transformation ...
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