Kodning av information

Kommittébeteckning: SIS/TK 302 (Multimedia, kodning och representation)
Källa: ISO
Svarsdatum: den 19 jun 2019
Se merSe mindre
 

This part of ISO/IEC 18477 specifies a coding format, referred to as JPEG XT, which is designed primarily for continuous-tone photographic content.

Kommittébeteckning: SIS/TK 302 (Multimedia, kodning och representation)
Källa: ISO
Svarsdatum: den 19 jun 2019
Se merSe mindre
 

This Recommendation | International Standard specifies a coding format, referred to as JPEG XT, which is designed primarily for continuous-tone photographic content.

Kommittébeteckning: SIS/TK 302 (Multimedia, kodning och representation)
Källa: ISO
Svarsdatum: den 19 jun 2019
Se merSe mindre
 

The scope of Common Media Application Format (CMAF) is the encoding and packaging of

segmented media objects for delivery and decoding on end user devices in adaptive

multimedia presentations. Segmented Media Objects are derived from encoded tracks for storage,

identification, and delivery. Delivery and presentation are abstracted by a hypothetical

application model for segmented Media Objects described by a manifest that allows a wide

range of implementations without specifying any.

CMAF constrains media encoding and packaging to allow interoperable adaptive delivery

of alternative tracks of segmented media to different devices, over different networks. ISO Base

Media File format file constraints and brand, CMAF defines CMAF Presentation Profiles, CMAF

Media Profiles and brands that specify track formats, media encoding constraints, and constraints on

sets of CMAF Tracks that can be adaptively selected or switched during playback. This

enables most Internet devices to play a CMAF Presentation conforming to a specified CMAF

Presentation Profile.

A manifest and player are assumed in the hypothetical application model. The manifest describes a

CMAF presentation and its media Resources, which reference addressable CMAF Media Objects. A

player can interpret a manifest, select, decode, synchronize, and present the Resources in

a continuous multimedia presentation consistent with the encoded CMAF Presentation.

CMAF does not specify a manifest, player, or delivery protocol, with the intent that any that

meet the functional requirements can be used.

See Section 6 for details of the CMAF Hypothetical Application Model, Media Object

Model, Specified Objects, and Profiles.

Kommittébeteckning: SIS/TK 302 (Multimedia, kodning och representation)
Källa: ISO
Svarsdatum: den 24 jun 2019
Se merSe mindre
 

This document specifies the framework, concepts, methodology for testing, and criteria to be achieved to claim conformance to multiple parts of ISO/IEC 21122 as listed below. It the procedures that shall be followed for conformance testing.

This document Specifies conformance testing procedures for decoders implementing ISO/IEC 21122-1

Specifies tests to check codestreams for conformance to ISO/IEC 21122-1. As such, it provides means to test whether encoder implementations generate syntactically correct codestreams, and whether codestreams generated by such implementations follow the requirements of a particular profile, level and sublevel, and the buffer model implied by them.

Specifies tests to check files for conformance to ISO/IEC 21122-3

Specifies conformance testing procedures that allow testing whether codestreams conform to any of the profiles specified in 21122-2.

Specifies conformance testing procedures that allow testing whether codestreams conform to the buffer model

specified in 21122-2 as part of a profile, level and sublevel.

Specifies codestreams, decoded images, and error metrics to be used within the decoder testing procedures

Provides a buffer model test Specifies abstract test suites

This document does not include the following tests:

Testing the reconstruction of a full resolution image from a subsampled image format. In particular, upsampling

from 4:2:2 to 4:4:4 sampling is a non-normative extension and as such its testing is beyond the scope of this document.

Testing the conversion of the sample values reconstructed by a ISO/IEC 21122-3 decoder to the target colour space by means of the colour specification box of ISO/IEC 21122-3

Testing of the composition of background and foreground for images reconstructed from ISO/IEC 21122-3 files or codestreams.

Acceptance testing: the process of determining whether an implementation satisfies acceptance criteria and

enables the user to determine whether or not to accept the implementation. This includes the planning and execution of several kinds of tests (e.g. functionality, quality, and speed performance testing) that demonstrate that the implementation satisfies the user requirement

Performance testing: measures the performance characteristics of an Implementation Under Test (IUT) such as its throughput, responsiveness, etc. under various conditions.

Robustness testing: the process of determining how well an implementation is able to conceal problems from attempting to reconstruct an image from an ill-formed codestream.

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: CEN
Svarsdatum: den 25 jul 2019
Se merSe mindre
 

This document specifies a method using a barcoding system for tracing potential isolated defects that can be present in the following kinds of coated or uncoated steel flat products, for example:

• electro-galvanised surface

• galvanised surface

• galvannealed surface

• cold rolled surface

This method, named "quality tracking", aims at transferring additional material information to the steel users, especially the location of some isolated defects, in a reliable way. This method enables the manufacturer or purchaser to eliminate blanks or coils containing defects.

The method uses a 1D barcode to identify each section of steel strip.

NOTE 1 The stakeholders most involved in this technique are suppliers of steel flat products, car makers, appliance makers, part manufacturers, blanking line builders, steel processors, service centres, etc. All stakeholders can benefit from this project since defects can be traced, and, therefore, the steel containing defects can be eliminated or set apart of the production line.

NOTE 2 In the first stages of development, this method was called "defect tracking" (see [1]) and has been changed into "quality tracking" at the beginning of the standardization process.

NOTE 3 Quality tracking can be applied to other types of coated or uncoated steel flat products such as pickled and oiled, organic coated, and steels for packaging. Quality tracking can be applied for coiled materials for which the technology of quality tracking is applicable.

NOTE 4 If quality tracking data are used outside of the purpose of quality tracking, it is under the responsibility of the user.

NOTE 5 Quality tracking can be applied to other materials than steel.

NOTE 6 The way to collect the information to be transferred to the user is out of the scope of this document.