08-30190107-DC.pdf
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1、a Date: 24 September 2008 Origin: International Latest date for receipt of comments: 31 December 2008 Project no.: 2008/00035 Responsible committee: IST/37 Coding of picture, audio, multimedia and hypermedia information Interested committees: Title: Information technology - JPEG XR image coding syst
2、em Part 2: JPEG XR image coding specification Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (conta
3、ct details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 December 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement wil
4、l normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic cir
5、culation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email . British, International and foreign standards are also available from BSI Customer Services. I
6、nformation on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British S
7、tandards Online Service on the BSI web site http:/. Direct tel: 020 8996 7431 Responsible Committee Secretary: Mrs J M Stride (BSI) E-mail: Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/301
8、90107 DC Licensed CopyChinese University of Hong Kong, 21/10/2008 08:43, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the con
9、sequent standard. If no comments are received to the contrary, then the UK will approve this draft. There is a high probability that this text could be adopted by CENELEC as a reference document for harmonization or as a European Standard. Recipients of this draft are requested to comment on the tex
10、t bearing in mind this possibility. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. BSI Committee Responsibilities Whether or not the standard is published in its original (international) form, or as a formal British Standar
11、d Implementation, the BSI committees responsibilities are to: - aid enquirers to understand the text; - present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; - monitor related International and European developmen
12、ts and promulgate them in the UK. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronica
13、lly, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still
14、 adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/ Template for comments and secretari
15、at observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment s
16、ubmitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete
17、 reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:43, Uncontrolled Copy, (c) BSI ISO/IEC JTC 1/SC 29/WG1 N 4739 14 September 2008 ISO/IEC JTC 1/SC 29/WG 1 ( and
18、 when a variable is set to the value FALSE, it is set to the value 0. 5.2.3 Relational operators Greater than = Greater than or equal to b Arithmetic right shift of a twos complement integer representation of x by b binary digits, where b is a non-negative integer. Bits shifted into the MSBs as a re
19、sult of the right shift have a value equal to the MSB of x prior to the shift operation. x = x = a is defined as x = (x a) 5.2.6 Precedence order of operators Operators are listed below in descending order of precedence. If several operators appear in the same line, they have equal precedence. When
20、several operators of equal precedence appear at the same level in an expression, evaluation proceeds according to the associativity of the operator either from right to left or from left to right. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:43, Uncontrolled Copy, (c) BSI ISO/IEC FCD
21、29199-2 : 200x (E) 8 Draft ITU-T Rec. T.JXR (200x E) Operators Type of operation Associativity (), , . Expression Left to Right +, Postfix operators Right to Left , ! Unary *, /, %, y x Multiplication Left to Right +, Addition and subtraction Left to Right Arithmetic shift Left to Right. , = Relatio
22、nal Left to Right = =, != Equality test Left to Right The following pseudocode convention specifies evaluation of an “initial statement“ followed by evaluation of a “condition“; if the “condition“ is TRUE, it specifies repeated execution of the “primary statement“ followed by a “subsequent statement
23、“, followed by checking a “condition“, until the “condition“ is no longer TRUE. for (initial statement; condition; subsequent statement) primary statement; The following pseudocode convention specifies that a “statement“ is executed if a “condition“ is TRUE, and that an “alternate statement“ is othe
24、rwise performed. if (condition) statement; else alternative statement; The following pseudocode convention specifies the return of the value of the variable or expression “aExp“ from the pseudocode function or a syntax structure. return aExp; The following pseudocode convention specifies the initial
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