ISO/IEC 15444-6:2003 信息技术-JPEG2000图象编码系统-第6部分：图象档案格式

标准编号：ISO/IEC 15444-6:2003

中文名称：信息技术-JPEG2000图象编码系统-第6部分：图象档案格式

英文名称：Information technology — JPEG 2000 image coding system — Part 6: Compound image file format

发布日期：2003-10

标准范围

ISO/IEC 15444-6:20 03定义了用于使用JPEG 2000文件格式家族架构存储复合图像的标准但可选的文件格式。复合图像是可以包含扫描图像、合成图像或两者的图像，并且优选地需要连续色调和双层压缩方法的混合。除了为连续色调和双层图像的混合定义二进制容器之外，该格式还定义了描述如何组合多个图像以生成复合图像的合成模型。该合成模型基于ITU-T T.44 ISO/IEC 16485中定义的多层混合光栅内容(MRC)成像模型。ISO/IEC 15444这一部分中定义的文件格式的名称是JPEG 200多层或JPM。JPM文件使用ITU中指定的文件格式架构-T Rec T.800 ISO/IEC 15444-1。因此，JPM文件是一系列连续的框。它使用在ITU-T Rec T.800 ISO/IEC 15444-1中为JP2文件格式定义的框和在ITU-T Rec T.801 ISO/IEC 15444-2中定义的JPX文件格式。当存储在传统的计算机文件系统中时，符合该国际标准的文件应该具有文件扩展名.jpm。在Macintosh文件系统上，类型代码应为“jpm40”。ISO/IEC 15444-6:20 03对于存储多个页面、具有混合内容的图像和/或需要比JP2中提供的更多结构的图像的应用是有用的。JPM文件将复合图像文档存储为页面序列，每个页面由布局对象序列组成，而布局对象序列又由MRC掩码-图像对象对组成。一个JPM文件可以支持MRC-编码数据、纯二进制对象和页面、JPEG 2000压缩对象和页面，或所有这些的混合。这些元素(页面、布局对象、掩码/图像对象)中的每一个可以具有标签和相关联的元数据。此外，一个JPM文件包含一个主页集合，用于组织和导航复合图像文档中的页面。JPM的一个关键特性是它支持碎片化的JPEG 2000码流，以便在web应用程序中实现渐进式和交互式渲染。JPM文件可以是自包含的，因为它包含合成文件中的一个或多个页面所需的所有数据。JPM文件还可以引用外部文件中的图像和数据。JPM web配置文件支持用于连续色调压缩的JPEG 2000和JPEG，以及用于双层压缩的G4、JBIG2和JPEG 2000。总之，ISO/IEC 15444-6:20 03规定:一种用于表示复合图像的多个双层和连续色调图像的二进制容器，一种用于基于混合光栅内容模型将多个图像组合成单个复合图像的机制，一种用于将多个图像分组在布局对象、页面和页面集合的层次结构中的机制，一种用于存储JPEG 2000和其他压缩图像数据格式的机制，一种用于将元数据包括在ISO/IEC 15444-6:20 03指定的文件中的机制。

ISO/IEC 15444-6:2003 defines a normative but optional file format for storing compound images using the JPEG 2000 file format family architecture. A compound image is an image that may contain scanned images, synthetic images or both, and that preferably requires a mix of continuous tone and bi-level compression methods. Besides defining a binary container for a mix of continuous-tone and bi-level images, this format defines a composition model that describes how the multiple images are combined to generate a compound image. This composition model is based on the multi-layer Mixed Raster Content (MRC) imaging model, defined in ITU-T T.44 | ISO/IEC 16485.The name of the file format defined in this part of ISO/IEC 15444 is JPEG 200 Multi-layer or JPM. A JPM file uses the file format architecture specified in ITU-T Rec T.800 | ISO/IEC 15444-1. Therefore, a JPM file is a contiguous sequence of boxes. It uses boxes defined for the JP2 file format in ITU-T Rec T.800 | ISO/IEC 15444-1 and the JPX file format defined in ITU-T Rec T.801 | ISO/IEC 15444-2. When stored in traditional computer file systems, files that conform to this International Standard should have the file extension.jpm. On Macintosh file systems, the type code should be 'jpm\040'.ISO/IEC 15444-6:2003 is useful for applications that store multiple pages, images with mixed content, and/or images that need more structure than provided in JP2. A JPM file stores a compound image document as a sequence of pages, each of which consists of a sequence of layout objects, each of which in turn consists of an MRC mask-image object pair. A JPM file can support MRC-encoded data, binary-only objects and pages, JPEG 2000-compressed objects and pages, or a mixture of all. Each of these elements (page, layout object, mask/image object) may have a label and associated metadata.In addition, a JPM file contains a main page collection, which is used to organize and navigate the pages in a compound image document. A key feature of JPM is its support of fragmented JPEG 2000 codestreams to enable progressive and interactive rendering in web applications. A JPM file may be self-contained in that it contains all the data needed to composite the page or pages in the file. A JPM file may also reference images and data in external files. The JPM web profile supports JPEG 2000 and JPEG for continuous tone compression, and G4, JBIG2 and JPEG 2000 for bi-level compression.In summary, ISO/IEC 15444-6:2003 specifies:

• a binary container for multiple bi-level and continuous-tone images used to represent a compound image,
• a mechanism by which multiple images can be combined into a single compound image, based on the Mixed Raster Content model,
• a mechanism for grouping multiple images in a hierarchy of layout objects, pages and page collections,
• a mechanism for storing JPEG 2000 and other compressed image data formats,
• a mechanism by which metadata can be included in files specified by ISO/IEC 15444-6:2003.

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