Full name JPEG Joint Photographic Experts Group, it is a International Standards Organization (ISO) engaged in a static image compression standard developed by the Commission. It worked out the first set of national standard still image compression standard: ISO 10918-1 JPEG is what we called a. As the JPEG fine quality, making it in just a few years and great success, the current site on 80% of the image is compressed using JPEG standard. However, with the proliferation of multimedia applications, the traditional JPEG compression technology has been unable to satisfy the requirements of the multimedia image data. Therefore, a higher compression ratio and more new features of next-generation JPEG 2000 still image compression technology was born.
JPEG 2000 is formally known as "ISO 15444", the same organization responsible for the development by the JPEG. Since March 1997 the planning, but a few years, the issue of delay in the algorithm selected a lot of time, it is widely expected to go to in December 2000 to develop JPEG2000 was completed in March 2000 at a meeting in Tokyo may be due to digital camera manufacturers put pressure on the final provisions of the basic coding system introduced earlier draft agreement was finally renamed as JPEG2001 without a.
JPEG JPEG 2000 and the biggest difference between traditional, in that it abandoned the JPEG discrete used to convert the remaining string (Discrete Cosine Transform) block-based encoding, and used the wavelet transform (Wavelet transform)-based multi-resolution encoding. The main objective of wavelet transform to the image of the frequency components extracted. Simple diagram can refer to the diagram.
1, JPEG2000 upgrade as JPEG, high compression (low bit rate) is the goal, the JPEG compression ratio higher than about 30%.
2, JPEG2000 supports both lossy and lossless compression, while JPEG only supports lossy compression. Save it for important pictures.
3, JPEG2000 can achieve progressive transmission of JPEG2000 this is an extremely important feature. This is the GIF format images we often say "Starts" feature. It is the first outline of image transmission, and then gradually transfer the data to continuously improve image quality, so that images from the obscure to the clear display, but not necessarily the same as the current JPEG, shown from top to bottom slowly.
4, JPEG2000 support the so-called "region of interest" feature, you can specify the image you are interested in any area of the compression quality can also choose to specify some of the first extract. So that we can easily highlight the point.
JPEG 2000 application areas could be roughly divided into two parts, a market for traditional JPEG, such as printers, scanners, digital cameras, etc.; an emerging application areas, such as network network transmission, wireless communications, medical images. The current enthusiasm for JPEG 2000 is the biggest digital camera maker that. JPEG JPEG 2000 and the obvious advantages compared to, and backwards compatibility, just around the corner to replace the traditional JPEG format.
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