What is ISO/IEC 9281-1 - Identification of picture coding methods about?
ISO/IEC 9281-1 specifies the identification methods for coding of pictorial information in digital form. It does not specify the contents of the data field of a picture entity. For instance, this field may also contain audio and/or animation data associated with the data specifying the picture(s).
ISO/IEC 9281-1 serves as a basis for a number of standards. In combination with one or more of those, pictorial information in digital form, using one or more methods of coding, may be built up into a document for visual comprehension.
Graphic characters coded in accordance with other standards can also be combined with the picture information. The coded information from such a document may be processed, and transmitted by telecommunications systems.
ISO/IEC 9281-1 also specifies a technique for switching between character-coded information and digital pictorial information, and between different picture coding methods.
Who is ISO/IEC 9281-1 - Identification of picture coding methods for?
ISO/IEC 9281-1 on identification of picture coding methods is useful for:
- The information technology industry
- Data coding companies
- Data storage companies
- Graphics designers/ engineers
- IT engineers
Why should you use ISO/IEC 9281-1 - Identification of picture coding methods?
Within the picture coding environment, different types of picture coding methods can be used, the identification of which is essential.
ISO/IEC 9281-1 specifies the identification methods for coding of pictorial information in digital form where the information can be stored, processed, or interchanged by telecommunications or by the exchange of physical storage media. Techniques are provided to switch between picture coding methods in the picture coding environment, as well as to switch between the picture coding environment and coding systems according to ISO 2022.
ISO/IEC 9281-1 also provides guidance about CMI specification, switching from character coding to picture coding and vice versa, registration authority along with a schematic representation of the structure of the bytes specifying the length of the PDE, code table for the bytes of the CMI.
Note: Thus, ISO/IEC 9281-1 is limited to coding and does not address functional aspects which are covered by other International Standards, e.g. ISO 8613. ISO 2022 deals with byte-oriented coding and extension techniques for graphic characters and control functions, and assigns specific areas of the code table to graphic characters and to control functions.
In picture coding this structure cannot be retained. Picture coding methods constitute, therefore, coding systems different from that of ISO 2022. Indeed, the control functions may take the form of operations (opcodes) and operands.
Because ISO/IEC 9281-1 is intended to serve as a basis for a number of other standards for specific picture coding methods, an introduction to its basic concepts is included in it.
