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- Acharya T.

Acharya T. - John Wiley & Sons, 2000. - 292 p.
ISBN 0-471-48422-9
Download (direct link): standardforImagecompressioncon2000.pdf
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9. K. Andra, T. Acharya, and C. Chakraborti, “Efficient VLSI Implementation of Bit-plane Coder of JPEG2000,” in Proc. of the SPIE Intl. Symposium on Optical Science and Technology, Applications of Digital Image Processing XXIV, Vol. 4472, pp. 246-257, San Diego, July 2001.
10. K. Andra, “Wavelet and Entropy Coding Accelerators for JPEG2000,” Ph.D. Dissertation, Arizona State University, December 2001.
11. J. S. Chiang, Y. S. Lin, and C. Y. Hsieh, “Efficient Pass-Parallel for EBCOT in JPEG2000,” Proc. of the IEEE Intl. Symposium on Circuits and Systems (ISCAS 2002), pp. 773-776, Scottsdale, Arizona, May 2002.
12. Y. T. Hsiao, H. D. Lin, and C. W. Jen, “High-Speed Memory Saving Architecture for the Embedded Block Coding in JPEG2000,” Proc. of the IEEE Intl. Symposium on Circuits and Systems (ISCAS 2002), pp. 133-136, Scottsdale, Arizona, May 2002.
13. H. H. Chen, C. J. Lian, T. H. Chag, and L. G. Chen, “Analysis of EBCOT Decoding Algorithm and its VLSI Implementation for JPEG 2000,” Proc.
REFERENCES 251
of the IEEE Intl. Symposium on Circuits and Systems (ISCAS 2002), pp. 329-332, Scottsdale, Arizona, May 2002.
14. C. J. Lian, K. F. Chen, H. H. Chen, and L. G. Chen, “Analysis and Architecture Design of Block-coding Engine for EBCOT in JPEG 2000,” IEEE Transactions of Circuits and Systems for Video Technology, Vol.
13, No. 3, pp. 219-230, March 2003.
15. Analog Devices Inc. (2003), ADV202: JPEG2000 Video CODEC, preliminary data sheet (REV.PrT). www.analog.com
16. inSilicon Corporation (2001), JPEG2000 Encoder, www.insilicon.com.
17. DWPworx Inc. (2002) DSW2000S (Rev.0.7): JPEG2000 and MPEG Encoder Decoder, www.dspworx.com/downloads/dsw2000s-pb.pdf
18. Amphion(2003). CS6590: JPEG2000 Codec, www.amphion.com/cs6590.html
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10
Beyond Part 1 of JPEG2000 Standard
10.1 INTRODUCTION
In this book, we mainly focused on the algorithms and VLSI implementation of the key modules in the JPEG2000 Part 1 standard. Part 1 is the core coding system of the JPEG2000 standard [1], which was published in 2000 as an international standard. We have dealt with the underlying algorithms, syntax of the compressed bitstream, and file format pertinent to Part 1 of the JPEG2000 standard in great detail in Chapters 6-8.
There are five more parts (Parts 2-6) that were completed or nearly completed by the standards committee as of writing this book [2, 3, 4, 5, 6]. We introduce these parts in this chapter in the following sections. Part 7 was proposed but has been abandoned lately. There are five more parts (Parts 8-12) currently under development as of writing this book [7, 9]. In this chapter, we give a quick introduction to these parts as well.
10.2 PART 2: EXTENSIONS
Numerous elements described in Part 1 have been further extended in Part 2 of the JPEG2000 standard [2]. These extensions have been described in Annex A to Annex M of the JPEG2000 Part 2 standard document [2]. In order to accommodate all the changes (extensions) from the Part 1 standard, new relevant marker segments have been introduced in JPEG2000 Part 2 Annex A with extensions of existing marker segments in Part 1. These new extended
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BEYOND PART 1 OF JPEG2000 STANDARD
markers still follow the same syntactic rules as the syntax in JPEG2000 Part 1 [1] for code-stream organization explained in Chapter 8. Some of the key features adopted in the JPEG2000 Part 2 standard are discussed in the following sections.
10.2.1 Variable DC Offset
Annex B of Part 2 describes an extension that allows variable DC offset (for DC level shifting) prior to multicomponent transformations during encoding and after the inverse multicomponent transformations during decoding. In conjunction with a new marker segment DCO (DC offset) as described in Annex A of Part 2, users can select an arbitrary offset (integer or floating-point) for DC level shifting at the encoding time and pass the offset information via the DCO marker.
10.2.2 Variable Scalar Quantization Offsets
This extension allows users to select smaller or larger dead-zones for scalar quantization of their choice of applications. The visual appearance of low-level textures may be improved with different dead-zone scalar quantization step sizes. Accordingly, the variable quantization step-size can be represented as 2(1 — £)A, where £ [—1, +1) is a real number and can vary subband to subband, component to component, and tile to tile. Clearly, the value of £ in Part 1 is 0. The extended versions of QCD and/or QCC marker segments are used to carry this information of £ in the code-stream so that the decoder can parse the selected quantization step size from these marker segments in order to decode the compressed file uniquely. The presence of these extended marker segments (i.e., £ > 0) is indicated by the first bit of the capability Rsiz parameter (Rsiz\ = 1) in the SIZ marker segment.
10.2.3 Trellis-Coded Quantization
The special case of the Trellis Coding algorithm [10], trellis-coded quantization (TCQ) [11], is provided as an alternative to the dead-zone scalar quantization in JPEG2000 Part 2. The TCQ algorithm is actually a spatial-varying scalar quantization technique [11]. One of four scalar quantization factors is chosen for each wavelet coefficient. No additional marker segment is used to implement the TCQ for quantization in Part 2. If the TCQ is chosen, it is signaled by the second bit of the capability Rsiz parameter (Rsiz2 = 1) in the SIZ marker segment.
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