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1、ICS 35.040 Ref. No. ISO/IEC 15444-1:2004/Cor.1:2007(E) ISO/IEC 2007 All rights reserved Published in Switzerland INTERNATIONAL STANDARD ISO/IEC 15444-1:2004 TECHNICAL CORRIGENDUM 1 Published 2007-07-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION INTERN
2、ATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE Information technology JPEG 2000 image coding system: Core coding system TECHNICAL CORRIGENDUM 1 Technologies de linformation Systme de codage dimage JPEG 2000: Systme de codage noyau RECTIFICATIF TECHNIQUE 1 Technical Cor
3、rigendum 1 to ISO/IEC 15444-1:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, in collaboration with ITU-T. The identical text is published as ITU-T Rec. T.800 (2002)/Cor.1 (01/2
4、007). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 02:29:24 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organizatio
5、n for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 02:29:24 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 15444-1:2004/Cor.1:2007 (E) ITU-T Rec. T.800 (2002)/Cor.1 (01/2007)
6、1 INTERNATIONAL STANDARD ITU-T RECOMMENDATION Information technology JPEG 2000 image coding system: Core coding system Technical Corrigendum 1 1) Table I.2 Replace the Image Header box Comments field with the following text: This box specifies aspects of the reference grid geometry, number of compon
7、ents and bit depth. 2) Annex I.5.3 Replace the second sentence of the ihdr item with the following text: This box specifies information about the reference grid geometry, bit depth, and number of components. 3) Annex I.5.3.1 a) Add the following paragraph to the end of the HEIGHT item: The HEIGHT is
8、 not always the same as the default image height. See I.5.3.1.1 for formulae specifying the default image dimensions when no other rendering information is present. The HEIGHT value will always be an upper bound on the default image height. b) Add the following paragraph to the end of the WIDTH item
9、: The WIDTH is not always the same as the default image width. See I.5.3.1.1 for formulae specifying the default image dimensions when no other rendering information is present. The WIDTH value will always be an upper bound on the default image width. c) Add a new clause I.5.3.1.1 I.5.3.1.1 Default
10、Image Dimensions In instances where only image samples for individual components are needed, refer directly to the component sample dimension equation B-2. However, when some rendering is required, lacking other rendering or expansion directives, the default image dimensions aim to maintain the imag
11、e area aspect ratio and are computed from the codestream SIZ marker as a function of, M, the greatest common divisor (gcd) of all the subsampling factors (XRsizc, YRsizc) for all components of the image. Specifically: M = gcdXRsizc, YRsizc | for all c, 0 c 1, the default image has dimensions smaller
12、 than WIDTH and HEIGHT. NOTE For example, suppose there is a codestream with Xsiz = Ysiz = 1024 and XOsiz = 3 and YOsiz = 2. This codestream in a JP2 file would have an Image Header box with WIDTH = 1021 and HEIGHT = 1022. The default image dimensions, however, will depend upon the values of XRsiz a
13、nd YRsiz. Here are a few different possibilities: a) If any of the subsampling factors XRsizc or YRsizc is one, then M = 1, and the default image dimensions will equal WIDTH and HEIGHT. b) If XRsiz = 2 and YRsiz = 4, then M = 2 and the default dimensions are image width = 512 2 = 510 and image heigh
14、t = 512 1 = 511. c) If there are 3 components all with XRsizc = YRsizc = 4, then M = 4 and the default image width and height are both 256 1 = 255. d) If there are 3 components with XRsiz0 = YRsiz0 = 2, XRsiz1 = YRsiz1 = 3, XRsiz2 = YRsiz2 = 2, then M = 1, and the default image dimensions will equal
15、 WIDTH and HEIGHT. 4) Annex I.5.3.2 through the remainder of Annex I Confirm equations I-1 through I-3 and any references to them are renumbered as I-3 through I-5. Manually renumber if necessary. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/07/2007 02:29:24 MDTNo reproduction or networking permitted without license from IHS -,-,-