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1、JPEG2000图像压缩标准简介 郑州轻工业学院本科毕业设计（论文）英文翻译题 目 JPEG标准研究及算法实现 学生姓名 专业班级 电子信息07级1班 学 号 院 （系） 计算机与通信工程学院 指导教师 完成时间 2011 年4月10日 英文原文JPEG2000 image compression standard and characteristicsAbstractWith the development of the network and multimedia technologies , people need more and more images with high funct
2、ion and quantity , so the compressive image techniques require higher performance as well as new characteristics to satisfy some special use. For this , ISO released again a new static image compress technique - JPEG2000 , which may become the new image compression standard in the future.JPEG2000 is
3、 to adapt to the continuous development of image compression applications, the emergence of new still image compression standard. JPEG2000 image coding system describes the realization of the process, of which the basic algorithm used is described and key technologies, introduced the new standard fe
4、atures and applications, and its performance is analyzed. With the rapid growth of multimedia applications and networks continues to develop, the traditional JPEG compression technology has been unable to meet the peoples digital multimedia image data requirements, a more powerful and efficient supe
5、rior still image compression standard has been referred to the development agenda , this is a JPEG2000. 1. IntroductionJPEG (Joint Photographic Experts Group) is the International Organization for Standardization (ISO) developed under the leadership of the committee still image compression standard,
6、 the first set of international still image compression standard ISO 10918-1 (JPEG) is that established by the Committee. As the excellent quality JPEG, so that within a few years he was a great success, is widely used in the field of Internet and digital cameras on the site 80% have adopted the JPE
7、G image compression standard. However, the current JPEG still image compression standard, with mid-range and high-bit-rate on the rate distortion characteristics of a good, but in the context of low bit rate, there will be obvious blocking effects, its quality has become unacceptable . JPEG can not
8、be provided in a single stream lossy and lossless compression, and can not support more than 64 64 K of the image compression. At the same time, despite the current JPEG standard has a requirement to restart the interval, but when bit errors encountered when the image quality will be seriously damag
9、ed. To solve these problems, since March 1997 onwards, JPEG image compression standards committee started to develop a new generation of image compression standard to address these problems. In March 2000 the Tokyo conference to identify a new generation of color still image coding standard JPEG2000
10、 image compression coding algorithm. 2. JPEG2000 image compression standard profileJPEG2000 system is divided into the following seven parts: JPEG2000 image coding system Expansion (to the core of the definition add more features and sophistication); movement JPEG2000; consistency; reference softwar
11、e (now includes Java and C implementation); compound image file format (for document scanning and fax applications); of the minimum support to (technical report). as fully accredited ISO standard that defines the core compression and minimum file formats, definition of compression and expansion of f
12、ile formats. Which, has been finalized, and other are still in process. Discussed in this article is based on the JPEG2000 standard Part 1. In the encoder, firstly the source images of the result of the pre-treatment, to deal with the results of discrete wavelet transform, wavelet coefficients obtai
13、ned. Then the wavelet coefficients were quantizatived and entropy coding, the final composition of the standard output code stream (bit stream). Decoders are encoder reverse process,First to code flow unpack and entropy decoding, and then reverse to quantify and discrete wavelet inverse transform, i
14、nverse transform the results of the post-processing synthesis, we have reconstructed image data. Although JPEG2000 and JPEG encoding and decoding process is similar, there is a very big difference between the the concrete realization of each step. The general steps in the encoding process is as foll
15、ows: (1) composed of more than one color component image is decomposed into a single color component image. There are certain correlation between weight by decomposition related components, through the decomposition of the relevant components transform can reduce the redundancy between the data to improve compression efficiency; (2) components of the image is decomposed into a rectangle the size of a unified piece - the image chip. Image film is transformed, and the basic unit of encoding and decoding;(3) Every i
