Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Free
Faster access than browser!
 

H.261

Index H.261

H.261 is an ITU-T video compression standard, first ratified in November 1988. [1]

43 relations: Chroma subsampling, Chrominance, Color space, Common Intermediate Format, Data compression, Deblocking filter, Decimation (signal processing), Discrete cosine transform, Entropy encoding, Ffdshow, FFmpeg, GNU Lesser General Public License, H.120, H.262/MPEG-2 Part 2, H.263, H.264/MPEG-4 AVC, H.323, High Efficiency Video Coding, Image, Integrated Services Digital Network, Inter frame, International Telecommunication Union, Interoperability, ITU-T, K. R. Rao, Libavcodec, Luma (video), Macroblock, Motion compensation, Motion estimation, Motion vector, MPEG-4 Part 2, MPlayer, N. Ahmed, Nippon Telegraph and Telephone, Quantization (signal processing), Run-length encoding, Transform coding, Variable-length code, Video Coding Experts Group, Video coding format, VLC media player, YCbCr.

Chroma subsampling

Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance.

New!!: H.261 and Chroma subsampling · See more »

Chrominance

Chrominance (chroma or C for short) is the signal used in video systems to convey the color information of the picture, separately from the accompanying luma signal (or Y for short).

New!!: H.261 and Chrominance · See more »

Color space

A color space is a specific organization of colors.

New!!: H.261 and Color space · See more »

Common Intermediate Format

CIF (Common Intermediate Format or Common Interchange Format), also known as FCIF (Full Common Intermediate Format), is a standardized format for the picture resolution, frame rate, color space, and color subsampling of digital video sequences used in video teleconferencing systems.

New!!: H.261 and Common Intermediate Format · See more »

Data compression

In signal processing, data compression, source coding, or bit-rate reduction involves encoding information using fewer bits than the original representation.

New!!: H.261 and Data compression · See more »

Deblocking filter

A deblocking filter is a video filter applied to decoded compressed video to improve visual quality and prediction performance by smoothing the sharp edges which can form between macroblocks when block coding techniques are used.

New!!: H.261 and Deblocking filter · See more »

Decimation (signal processing)

In digital signal processing, decimation is the process of reducing the sampling rate of a signal.

New!!: H.261 and Decimation (signal processing) · See more »

Discrete cosine transform

A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies.

New!!: H.261 and Discrete cosine transform · See more »

Entropy encoding

In information theory an entropy encoding is a lossless data compression scheme that is independent of the specific characteristics of the medium.

New!!: H.261 and Entropy encoding · See more »

Ffdshow

ffdshow is a codec mainly used for decoding of video in the MPEG-4 ASP (e.g. encoded with DivX or Xvid) and H.264/MPEG-4 AVC video formats, but it supports numerous other video and audio formats as well.

New!!: H.261 and Ffdshow · See more »

FFmpeg

FFmpeg is a free software project, the product of which is a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams.

New!!: H.261 and FFmpeg · See more »

GNU Lesser General Public License

The GNU Lesser General Public License (LGPL) is a free software license published by the Free Software Foundation (FSF).

New!!: H.261 and GNU Lesser General Public License · See more »

H.120

H.120 was the first digital video compression standard.

New!!: H.261 and H.120 · See more »

H.262/MPEG-2 Part 2

H.262 or MPEG-2 Part 2 (formally known as ITU-T Recommendation H.262 and ISO/IEC 13818-2, also known as MPEG-2 Video) is a video coding format developed and maintained jointly by ITU-T Video Coding Experts Group (VCEG) and ISO/IEC Moving Picture Experts Group (MPEG).

New!!: H.261 and H.262/MPEG-2 Part 2 · See more »

H.263

H.263 is a video compression standard originally designed as a low-bit-rate compressed format for videoconferencing.

New!!: H.261 and H.263 · See more »

H.264/MPEG-4 AVC

H.264 or MPEG-4 Part 10, Advanced Video Coding (MPEG-4 AVC) is a block-oriented motion-compensation-based video compression standard.

New!!: H.261 and H.264/MPEG-4 AVC · See more »

H.323

H.323 is a recommendation from the ITU Telecommunication Standardization Sector (ITU-T) that defines the protocols to provide audio-visual communication sessions on any packet network.

New!!: H.261 and H.323 · See more »

High Efficiency Video Coding

High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard, one of several potential successors to the widely used AVC (H.264 or MPEG-4 Part 10).

New!!: H.261 and High Efficiency Video Coding · See more »

Image

An image (from imago) is an artifact that depicts visual perception, for example, a photo or a two-dimensional picture, that has a similar appearance to some subject—usually a physical object or a person, thus providing a depiction of it.

New!!: H.261 and Image · See more »

Integrated Services Digital Network

Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network.

New!!: H.261 and Integrated Services Digital Network · See more »

Inter frame

An inter frame is a frame in a video compression stream which is expressed in terms of one or more neighboring frames.

New!!: H.261 and Inter frame · See more »

International Telecommunication Union

The International Telecommunication Union (ITU; Union Internationale des Télécommunications (UIT)), originally the International Telegraph Union (Union Télégraphique Internationale), is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.

New!!: H.261 and International Telecommunication Union · See more »

Interoperability

Interoperability is a characteristic of a product or system, whose interfaces are completely understood, to work with other products or systems, at present or in the future, in either implementation or access, without any restrictions.

New!!: H.261 and Interoperability · See more »

ITU-T

The ITU Telecommunication Standardization Sector (ITU-T) is one of the three sectors (divisions or units) of the International Telecommunication Union (ITU); it coordinates standards for telecommunications.

New!!: H.261 and ITU-T · See more »

K. R. Rao

K.

New!!: H.261 and K. R. Rao · See more »

Libavcodec

libavcodec is a free and open-source library of codecs for encoding and decoding video and audio data.

New!!: H.261 and Libavcodec · See more »

Luma (video)

In video, luma represents the brightness in an image (the "black-and-white" or achromatic portion of the image).

New!!: H.261 and Luma (video) · See more »

Macroblock

Macroblock is a processing unit in image and video compression formats based on linear block transforms, such as the discrete cosine transform (DCT).

New!!: H.261 and Macroblock · See more »

Motion compensation

Motion compensation is an algorithmic technique used to predict a frame in a video, given the previous and/or future frames by accounting for motion of the camera and/or objects in the video.

New!!: H.261 and Motion compensation · See more »

Motion estimation

Motion estimation is the process of determining motion vectors that describe the transformation from one 2D image to another; usually from adjacent frames in a video sequence.

New!!: H.261 and Motion estimation · See more »

Motion vector

In video compression, a motion vector is the key element in the motion estimation process.

New!!: H.261 and Motion vector · See more »

MPEG-4 Part 2

MPEG-4 Part 2, MPEG-4 Visual (formally ISO/IEC 14496-2) is a video compression format developed by MPEG.

New!!: H.261 and MPEG-4 Part 2 · See more »

MPlayer

MPlayer is a free and open media player software.

New!!: H.261 and MPlayer · See more »

N. Ahmed

Nasir Ahmed (born 1940 in Bangalore, India) is a Professor Emeritus of Electrical and Computer and Engineering at University of New Mexico (UNM).

New!!: H.261 and N. Ahmed · See more »

Nippon Telegraph and Telephone

, commonly known as NTT, is a Japanese telecommunications company headquartered in Tokyo, Japan.

New!!: H.261 and Nippon Telegraph and Telephone · See more »

Quantization (signal processing)

Quantization, in mathematics and digital signal processing, is the process of mapping input values from a large set (often a continuous set) to output values in a (countable) smaller set.

New!!: H.261 and Quantization (signal processing) · See more »

Run-length encoding

Run-length encoding (RLE) is a very simple form of lossless data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run.

New!!: H.261 and Run-length encoding · See more »

Transform coding

Transform coding is a type of data compression for "natural" data like audio signals or photographic images.

New!!: H.261 and Transform coding · See more »

Variable-length code

In coding theory a variable-length code is a code which maps source symbols to a variable number of bits.

New!!: H.261 and Variable-length code · See more »

Video Coding Experts Group

The Video Coding Experts Group or Visual Coding Experts Group (VCEG, also known as Question 6) is a working group of the ITU Telecommunication Standardization Sector (ITU-T) concerned with video coding standards.

New!!: H.261 and Video Coding Experts Group · See more »

Video coding format

A video coding format (or sometimes video compression format) is a content representation format for storage or transmission of digital video content (such as in a data file or bitstream).

New!!: H.261 and Video coding format · See more »

VLC media player

VLC media player (commonly known as VLC) is a free and open-source, portable, cross-platform media player and streaming media server developed by the VideoLAN project.

New!!: H.261 and VLC media player · See more »

YCbCr

YCbCr, Y′CbCr, or Y Pb/Cb Pr/Cr, also written as YCBCR or Y'CBCR, is a family of color spaces used as a part of the color image pipeline in video and digital photography systems.

New!!: H.261 and YCbCr · See more »

Redirects here:

H.261 standard, H261, P x 64, P × 64.

References

[1] https://en.wikipedia.org/wiki/H.261

OutgoingIncoming
Hey! We are on Facebook now! »