Overview
ISO/IEC 8613-7:1994/Amd 1:1998 is an amendment to the ISO/IEC 8613-7:1994 International Standard, which specifies the Open Document Architecture (ODA) and Interchange Format for raster graphics content architectures. This amendment, jointly developed by ISO/IEC and ITU-T, updates and enhances the specifications related to raster graphics encoding, coding schemes, and content architectures within ODA documents.
The standard addresses various methods for encoding raster graphics data, including well-known compression methods such as JPEG and JBIG, as well as precise definitions of coding types, tile types, and interleaving formats. It ensures interoperability and standardized representation of raster graphics in document interchange, which is critical in document processing, digital archiving, and imaging systems.
Key Topics
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Type of Coding: Defines multiple encoding schemes based on the number of bits per color component. Encoding options cover Rec. T.4 and T.6 (fax compression), bitmap encoding, JPEG, and JBIG, along with tiled encoding options.
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Tile Types: Specifies how tiles-rectangular regions of images-can be encoded with coding types such as null foreground/background, Rec. T.4/T.6 with or without MSB mapping, bitmap, JPEG, and JBIG encoding. This enables efficient storage and processing by encoding image segments differently.
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Interleaving Format: Describes the ways component samples (color or monochrome) are arranged in the image data sequence. Supported formats include pel, line, plane, and stripe interleaving, which can affect compression efficiency and image reconstruction.
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Subsampling Schemes: Introduces subsampling options for color components compatible with JPEG notation, including common chroma subsampling formats like 4:4:4, 4:2:2, and 4:1:1, enabling optimized data handling based on visual importance.
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Coding Attributes & Definitions: Clarifies terminology such as entropy encoding/decoding, adaptive binary arithmetic encoding, Huffman encoding, baseline sequential encoding, and progressive coding relevant to raster graphic compression.
Applications
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Document Interchange: Enhances the Open Document Architecture by standardizing how raster graphics are embedded, compressed, and represented across platforms and systems, ensuring documents retain their fidelity during exchange.
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Digital Archiving: Facilitates long-term storage of documents with embedded images by using internationally recognized encoding standards that preserve image quality and support lossless or lossy compression.
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Fax and Imaging Systems: Supports multiple encoding schemes like ITU-T Rec. T.4 and T.6 (fax standards) alongside modern codecs such as JPEG and JBIG for efficient image compression in communication devices.
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Multimedia & Publishing: Enables interoperability in systems that manipulate complex documents, including raster images, by providing flexible coding methods and interleaving options suited for different processing requirements.
Related Standards
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ISO/IEC 10918-1 (JPEG): Defines digital compression and coding standards for continuous-tone still images, referenced in coding methods within this specification.
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ISO/IEC 11544 (JBIG): Specifies progressive bi-level image compression techniques, integrated into the raster graphics encoding options.
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ITU-T Recommendations T.4 and T.6: Fax transmission standards providing one- and two-dimensional coding schemes used as baseline fax encodings in this standard.
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ISO/IEC 8613-1: Provides foundational definitions for the Open Document Architecture referenced in this amendment.
This amendment aligns ODA raster graphic content architectures with existing international compression and encoding standards, ensuring compatibility, efficient data representation, and broad applicability in various information technology domains.