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A discussion of a few simple audio compression methods follows, and the chapter concludes with a description of the three audio layers of MPEG-1, including the very popular mp3 format. Other new material consists of the following: * Conditional image RLE (Section 1.4.2). * Scalar quantization (Section 1.6). * The QM coder used in JPEG, JPEG 2000, and JBIG is now included in Sec tion 2.16. * Context-tree weighting is discussed in Section 2.19. Its extension to lossless image compression is the topic of Section 4.24. * Section 3.4 discusses a sliding buffer method called repetition times. * The troublesome issue of patents is now also included (Section 3.25). * The relatively unknown Gray codes are discussed in Section 4.2.1, in connection with image compression. * Section 4.3 discusses intuitive methods for image compression, such as subs- pling and vector quantization. |
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