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H.261 – standard kompresji video opracowany przez ITU-T pod koniec 1989 r. Standard ten przeznaczony jest do współpracy z ISDN. Dane są kompresowane z szybkością p*64 kbit/s, gdzie p waha się w przedziale 1 do 30, zależnie od liczby użytych kanałów ISDN.
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 ...
H.261 : Video codec for audiovisual services at p x 64 kbit/s. Recommendation H.261 (03/93) Approved in 1993-03-12. Status : In force. Table of Contents. Access : Freely available items. Available languages and formats :
H.261 (03/93) Video codec for audiovisual services at p x 64 kbit/s In force Superseded and Withdrawn components : Number: Title: Status: H.261 (11/88) Video codec for audiovisual services at p x 384 kbit/s Superseded : H.261 (12/90) Video codec for audiovisual services at p x 64 kbit/s Superseded
H.261 is an ITU-T standard for video compression. It is the first standard in the H.26x series, and the first usable video codec standard; it was preceded only by the experimental H.120 standard that never saw any use.
The video coding algorithm is shown in generalised form in Figure 3/H.261. The main elements are prediction, block transformation, quantization and classification.
Overview. H.261 is a standard video-conferencing codec. As such, it is optimized for low data rates and relatively low motion. Architectures Supported. NetShow. Video for Windows. Pros, Cons & Tips. H.261 is optimized for low data rates. Cons. Not generally as good quality as H.263.
