信息技术.JPEG 2000图像编码系统.第6部分:合成图像文件格式

[中文适用范围]： 该国际标准定义了一种规范但可选的文件格式，用于使用 JPEG 2000 文件格式系列架构存储复合图像。 该格式是 ITU-T Rec T.800 | 中定义的 JP2 文件格式的扩展。 ISO/IEC 15444-1 附件 I 并使用为 ITU-T Rec T.801 | 中定义的 JP2 文件格式和 JPX 文件格式定义的框。 ISO/IEC 15444-2 附录 M。 该标准对于存储多个页面、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程序非常有用。 实现此文件格式的应用程序应按照本国际标准中的描述来实现。 该国际标准 — 指定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， — 指定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 —规定了在布局对象、页面和页面集合的层次结构中对多个图像进行分组的机制， — 规定了存储 JPEG 2000 和其他压缩图像数据格式的机制， — 规定了元数据可以包含在本国际规定的文件中的机制标准。 [外文原描述]： 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.