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H.261: History & Standards

H.261 is an ITU-T video compression standard, first ratified in November 1988. It is the first member of the H.26x family of video coding standards in the domain of the ITU-T Study Group 16 Video Coding Experts Group (VCEG, then Specialists Group on Coding for Visual Telephony). It was the first video coding standard that was useful in practical terms.

Language: English [EN]
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H.261 topic overview

The analysis highlights History and Standards as prominent areas in the source structure around H.261.

Related topics
68
Source areas
5
Connected nodes
73
Extracted relationships
61
Concept neighborhoods
21
Bridge connections
73

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

H.261 design · 20 topics
Patent holders · 20 topics
History · 15 topics
Overview · 7 topics
Software implementations · 6 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Committee
ITU-T Study Group 16 VCEG (then: Specialists Group on Coding for Visual Telephony)
Domain
video compression
Latest version
(03/93)
Organization
ITU-T, Hitachi, PictureTel, NTT, BT, Toshiba, etc.
Related standards
H.262, H.263, H.264, H.265, H.266, H.320, ISO/IEC 14496-2
Status
Published

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

H.261 design

Software implementations

Patent holders

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How H.261 connects Entity context

The extracted context around H.261 shows recurring relationship patterns in the source. For example, H.261 → AT, BT GroupToshibaKDDIAlcatelCompression Labs, Communication Industrial Co, CorporationGPT Data Systems, GEC, Graphics Communication Technologies, HitachiPictureTel Corp, Inc, Ltd, Mitsubishi ElectricFujitsuOrange, NECElectronics, Nippon Telegraph, NTT, PhilipsSonySharp CorporationOki Electric IndustryMatsushita, Telecommunications Research Institute, Telephone, The Another extracted example is H.261 → CCITT, CCITT Study Group XV, Coding, DCT, DCT-based, DPCM, During, ITU-T, ITU-T SG16, NTT, Sakae Okubo, Since, Specialists Group, The, Visual Telephony, VQ. Use these groups to spot repeated connection types before inspecting the individual relationships.

H.261

Top relations

related to Patent holders · 17
H.261 → AT, BT GroupToshibaKDDIAlcatelCompression Labs, Communication Industrial Co, CorporationGPT Data Systems, GEC, Graphics Communication Technologies, HitachiPictureTel Corp, Inc, Ltd, Mitsubishi ElectricFujitsuOrange, NECElectronics, Nippon Telegraph, NTT, PhilipsSonySharp CorporationOki Electric IndustryMatsushita, Telecommunications Research Institute, Telephone, The
related to history · 16
H.261 → CCITT, CCITT Study Group XV, Coding, DCT, DCT-based, DPCM, During, ITU-T, ITU-T SG16, NTT, Sakae Okubo, Since, Specialists Group, The, Visual Telephony, VQ
related to H.261 design · 11
H.261 → Ahmed, DCT, Each, Natarajan, Rao, Scalar, The, The DCT, Transform, Whilst, YCbCr
related to Software implementations · 5
H.261 → FFmpeg, It, MPlayer, The LGPL-licensed, VLC
related to External links · 2
H.261 → ITU, Video
Committee · 1
H.261 → ITU-T Study Group 16 VCEG (then: Specialists Group on Coding for Visual Telephony)
Domain · 1
H.261 → video compression
Latest version · 1
H.261 → (03/93)
Organization · 1
H.261 → ITU-T, Hitachi, PictureTel, NTT, BT, Toshiba, etc.
Related standards · 1
H.261 → H.262, H.263, H.264, H.265, H.266, H.320, ISO/IEC 14496-2

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

video 261 coding standard itu-t compression first luma chroma using design standards kbit ntt also study group visual dct still

H.261 relationships Subject–Predicate–Object triples

TTTA extracted 61 structured relationships around H.261. Examples in this analysis include H.261 → Committee → ITU-T Study Group 16 VCEG (then: Specialists Group on Coding for Visual Telephony) and H.261 → Domain → video compression. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
H.261CommitteeITU-T Study Group 16 VCEG (then: Specialists Group on Coding for Visual Telephony)1.00infobox
H.261Domainvideo compression1.00infobox
H.261Latest version(03/93)1.00infobox
H.261OrganizationITU-T, Hitachi, PictureTel, NTT, BT, Toshiba, etc.1.00infobox
H.261Related standardsH.262, H.263, H.264, H.265, H.266, H.320, ISO/IEC 14496-21.00infobox
H.261StatusPublished1.00infobox
H.261SuccessorH.2621.00infobox
H.261Websitehttps://www.itu.int/rec/T-REC-H.2611.00infobox
H.261Year started19881.00infobox
H.261is aITU-T video compression standard0.90text
H.261related to External linksVideo0.60section
H.261related to External linksITU0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around H.261 bring nearby vocabulary together. In this analysis, examples include Specialists, Telephony and Group. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • video compression standard
    • Based
    • Dct
    • Video
    • Group
    • Standard
    • Also
    • Coding
    • Kbit
    • Standards
    • Itu-t
    • First
    • Design
  • video coding experts group
    • Specialists
    • Telephony
    • Study
    • Visual
    • Vceg
    • Video
    • Itu-t
    • Ntt
    • Standards
    • First
    • Group
    • Dct
  • video coding standard
    • Video
    • Standards
    • First
    • Specialists
    • Telephony
    • Group
    • Study
    • Visual
    • Dct
    • Itu-t
    • Also
    • Compression
  • itu-t study group 16
    • Specialists
    • Telephony
    • Group
    • Study
    • Visual
    • Vceg
    • Itu-t
    • Ntt
    • First
    • Bt
    • Hitachi
    • Picturetel
  • transform coding
    • Video
    • Standards
    • First
    • Specialists
    • Telephony
    • Using
    • Group
    • Study
    • Visual
    • Dct
    • Itu-t
    • Compression
  • itu-t
    • Specialists
    • Telephony
    • Group
    • Ntt
    • Study
    • Visual
    • Vceg
    • First
    • Bt
    • Hitachi
    • Picturetel
    • Toshiba
  • compression labs, inc.
    • Based
    • Dct
    • Video
    • Group
    • Standard
    • Coding
    • Standards
    • Itu-t
    • First
    • Vceg
    • Bt
    • Specialists
  • bt group
    • Toshiba
    • Ntt
    • Specialists
    • Telephony
    • Study
    • Visual
    • Hitachi
    • Picturetel
    • Vceg
    • Itu-t
    • Standards
    • Bt

Connections between topic areas Semantic bridges

For H.261, one of the stronger structural bridges in this analysis connects H.261 with H.261 design. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
H.261 — H.261 design · splits 53 ⟂ 21
H.261 — Patent holders · splits 53 ⟂ 21
H.261 — History · splits 58 ⟂ 16
H.261 — Overview · splits 66 ⟂ 8
H.261 — Software implementations · splits 67 ⟂ 7

Map overview Semantic statistics

H.261

Nodes74
Edges73
Triples61
Avg. degree1.97
Density0.027027
Components1

Source & methodology

TTTA analyzes the structure around H.261 to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History & Standards, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — H.261 · EN edition · Analysis: TopicsToTalkAbout

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