共找到 150 条与 quantization parameter 相关的标准，共 10 页
Temperature measurements for building automation - Temperatur sensors@ temperature sensing elements and their measurements parameters
本附录描述ITU-T H.263版本3（包括附录A至W）及随后批准的附录X的临时测试模型（TMN）。该测试模型的目的是通过视频编码器实现的示例，帮助制造商理解如何使用该建议的语法和解码器规范。H.263定义了比特流语法和相应的视频解码器，使不同制造商的视频终端能够互操作。视频编码器本身的设计不在H.263的规范范围内，留给制造商决定。然而，在制定本建议的过程中，出现了一些优选的编码方法。这些方法在通用和专用处理器上的复杂性级别以及不同的传输场景（如电路交换或分组交换网络）下，能够产生良好的视频质量和压缩效率。本附录描述了编码器操作，以及超出H.263规范文本的解码器操作（例如，由于在差错率高的信道上传输导致的语法违规情况）。
Examples for H.263 encoder/decoder implementations
本部分规定了 MPEG-4 AVC/H.264 视频压缩编码器的使用、测试和操作要求。它适用于视频编码器的设计、实现和验证。
Amendment 2 - Information technology -- Coding of audio-visual objects -- Part 16: Animation Framework eXtension (AFX) - Multi-resolution 3D mesh compression
This Recommendation1 describes algorithmic models for measuring the visual quality of IP-based video services. The models are hybrid-reduced reference (Hybrid-RR) models@ which use features extracted from the unimpaired reference video signal@ the non-encrypted bitstream data and the video image data captured at the video player. As output@ the models provide an estimate of visual quality on the [1@5] difference mean opinion score (DMOS) scale@ derived from five-point absolute category rating (ACR) as in [ITU-T P.910]. The models address low resolution (VGA/WVGA) application areas@ including services such as mobile TV@ as well as high resolution (HD) application areas@ including services such as IPTV. This Recommendation is to be used with video encoded using ITU-T H.264 and media payload encapsulated in RTP/UDP/IP packets for low resolution video and encapsulated in MPEG-TS/RTP/UDP/IP for high resolution video. The models in this Recommendation measure the visual effect of spatial and temporal degradations as a result of video coding@ erroneous transmission@ or video rescaling. The models may be used for applications such as to monitor the quality of deployed networks to ensure their operational readiness or to benchmark service quality. The models in this Recommendation can also be used for lab testing of video transmission systems. The models identified in this Recommendation have limited precision. Therefore@ directly comparing model results can be misleading. The accuracy of models has to be understood and taken into account (e.g.@ using [ITU-T J.149]). The validation test material consisted of video encoded using different implementations of [ITU-T H.264]. It included media transmitted over wired and wireless networks@ such as WIFI and 3G mobile networks. The transmission impairments included error conditions@ such as dropped packets and packet delay@ from simulations and from transmission over commercially operated networks. The following source reference channel (SRC) conditions were included in the validation test: 1080i 60 Hz (29.97 fps); 1080p (25 fps); 1080i 50 Hz (25 fps); 1080p (29.97 fps); SRC duration: HD:10 s@ VGA/WVGA: 10 s or 15 s (rebuffering); VGA at 25 and 30 frames-per-second; WVGA at 25 and 30 frames-per-second. 1 This Recommendation includes an electronic attachment containing test vectors@ including video sequences@ bitstream files and predicted objective model scores.
Hybrid-RR objective perceptual video quality measurement for HDTV and multimedia IP-based video services in the presence of a reduced reference signal and non-encrypted bitstream data (Study Group 9)
本建议描述了一种基于比特流的视频质量模型，可用于：作为独立的视频质量预测模型；或与音频和集成模块一起形成完整模型，以预测音频和视频媒体编码以及观察到的互联网协议（IP）网络损伤对多媒体流应用中最终用户体验质量的影响。所涉及的流技术包括渐进式下载和自适应流，适用于移动和固定网络流应用。该模型定义涵盖一系列用例，从监视视频有效载荷完全加密的比特流、未加密比特流、可以进行深度包检查或比特流在编码场所可用（例如从客户端）。因此，该模型具有广泛的应用范围，从编码优化到客户端体验质量（QoE）评估，再到网络或服务优化或基准测试目的。本建议中的模型是基于比特流的。该模型适用于渐进式下载和自适应流或其他具有可靠传输的流应用，其中最终用户体验的质量受到编码、空间重新缩放或视频帧率变化引起的视频劣化的影响。自适应流的质量评估包括媒体适应的方面，这些方面可能在集成模块中处理，如[ITU-T P.1203.3]中的模块，而不是本建议中的视频模块。本建议能够处理各种视频编解码器（即H.264、H.265/高效视频编码（HEVC）和视频有效载荷类型9（VP9），分辨率高达4K/超高清-1（UHD-1），帧率高达60帧/秒。与视频质量模块Pv相比，即[ITU-T P.1203.1]，仅涉及ITU-T H.264和全高清（HD）高达30帧/秒。该模型预测在五点绝对类别评分（ACR）量表上的平均意见分数（MOS）（见[ITU-T P.910]）作为整体视频质量MOS（5秒至10秒）。除了整体质量分数外，该视频质量模型还产生每秒钟的质量分数，适合诊断或集成到更长会话的积分质量分数中（例如，[ITU-T P.1203.3]中1分钟至5分钟持续时间会话）。与本建议相关的模型无法提供个体最终用户感知的视频质量的全面评估，因为分数反映了由于编码视频媒体数据通过具有特定性能的IP连接传输而感知的损伤，不包括特定终端美利体育官网首页网址或用户特定信息。由这种通用质量模型预测的分数必然反映平均感知质量。由于源生成的影响，如信号噪声、视频抖动、某些颜色属性（和其他类似视频因素）以及与有效载荷相关的其他损伤，不在该模型计算的分数中反映。因此，本建议可用于以下应用：特定基于IP的视听服务的服务中质量监控，如第6.1条更详细规定的；考虑编码比特率、编码分辨率和编码帧率影响的实时网络（包括编解码器）的性能和质量评估；视频系统的实验室测试；不同服务实现的基准测试。特别是目标应用是渐进式下载流和自适应流（使用可靠传输），包括以下内容：OTT服务，以及运营商管理的视频服务（通过TCP）；通过移动和固定连接的视频；与超文本传输协议（HTTP）或HTTP2通过TCP/IP或快速用户数据报协议互联网连接（QUIC）一起使用的流协议HTTP实时流（HLS）或动态自适应流通过HTTP（DASH），或实时消息协议（RTMP）通过TCP/IP。请注意，该模型对特定应用或传输层协议不可知，除了假设视频包的可靠传输；通常使用基于ISO/IEC基础媒体文件格式的容器格式的视频服务，如MPEG-4第14部分（MP4），或其他容器格式，如音频视频交错（AVI）、Matroska视频（MKV）、WebM、第三代合作伙伴（3GP）和MPEG-2传输流（MPEG2-TS）。请注意，该模型对容器格式类型不可知。
Video quality assessment of streaming services over reliable transport for resolutions up to 4K with access to full bitstream information
This Recommendation describes algorithmic models for measuring the visual quality of IP-based video services. The models are hybrid no-reference (Hybrid-NR) models, which use non-encrypted bitstream data and video image data captured at the video player. As output the models provide an estimate of visual quality on the [1,5] mean opinion score (MOS) scale, derived from five-point absolute category rating (ACR) as in [ITU-T P.910]. The models address low-resolution (VGA/WVGA) application areas, including services such as mobile TV, as well as high-resolution (HD) application areas, including services such as IPTV. This Recommendation is to be used with videos encoded using [ITU-T H.264] and media payload encapsulated in RTP/UDP/IP packets for the low-resolution and encapsulated in MPEG-TS/RTP/UDP/IP for the high-resolution areas. The models in this Recommendation measure the visual effect of spatial and temporal degradations as a result of video coding, erroneous transmission or video rescaling. The models may be used for applications such as to monitor the quality of deployed networks to ensure their operational readiness or to benchmark service quality. The models in this Recommendation can also be used for lab testing of video transmission systems. The models identified in this Recommendation have limited precision. Therefore, directly comparing model results can be misleading. The accuracy of models has to be understood and taken into account (e.g., using [ITU-T J.149]).
Hybrid-NR objective perceptual video quality measurement for HDTV and multimedia IP-based video services in the presence of non-encrypted bitstream data (Study Group 9)
This Recommendation is intended to present a list potential influencing factors for gaming Quality of Experience (QoE) assessment. The presented list of influencing factors can be considered for several purposes including@ but not limited to@ interactive and passive gaming QoE assessment@ steps during the game development circle@ and network service providers for (cloud) online gaming.
Influence factors on gaming quality of experience
This document specifies Neural Network Coding (NNC) as a compressed representation of the parameters/ weights of a trained neural network and a decoding process for the compressed representation, complementing the description of the network topology in existing (exchange) formats for neural networks. It establishes a toolbox of compression methods, specifying (where applicable) the resulting elements of the compressed bitstream. Most of these tools can be applied to the compression of entire neural networks, and some of them can also be applied to the compression of differential updates of neural networks with respect to a base network. Such differential updates are for example useful when models are redistributed after fine-tuning or transfer learning, or when providing versions of a neural network with different compression ratios. This document does not specify a complete protocol for the transmission of neural networks, but focuses on compression of network parameters. Only the syntax format, semantics, associated decoding process requirements, parameter sparsification, parameter transformation methods, parameter quantization, entropy coding method and integration/signalling within existing exchange formats are specified, while other matters such as pre-processing, system signalling and multiplexing, data loss recovery and post- processing are considered to be outside the scope of this document. Additionally, the internal processing steps performed within a decoder are also considered to be outside the scope of this document; only the externally observable output behaviour is required to conform to the specifications of this document.
Information technology — Multimedia content description interface — Part 17: Compression of neural networks for multimedia content description and analysis
This document specifies the syntax and an accompanying decompression process that is capable to represent continuous-tone grey-scale, or continuous-tone colour digital images without visual loss at moderate compression rates. Typical compression rates are between 2:1 and 18:1 but can also be higher depending on the nature of the image. In particular, the syntax and the decoding process specified in this document allow lightweight encoder and decoder implementations that limit the end-to-end latency to a fraction of the frame size. However, the definition of transmission channel buffer models necessary to ensure such latency is beyond the scope of this document. This document: — specifies decoding processes for converting compressed image data to reconstructed image data; — specifies a codestream syntax containing information for interpreting the compressed image data; — provides guidance on encoding processes for converting source image data to compressed image data.
Information technology — JPEG XS low-latency lightweight image coding system — Part 1: Core coding system
This standard defines a set of tools for efficient video coding and the corresponding decoding procedure, including intraprediction, interprediction, transform, quantization, and entropy coding.
IEEE Standard for Advanced Audio and Video Coding
本标准定义了一组用于高效视频编码和相应解码过程的工具，包括帧内预测、帧间预测、变换、量化和熵编码。 本标准提供了高效的编码工具集，用于视频数据的压缩、解压缩和打包，以节省存储空间和互联网传输带宽。 目标应用和服务包括但不限于互联网协议电视（IPTV）、基于IP的视频会议、基于IP的监控、用户生成的多媒体内容以及其他支持视频/音频的服务和应用，如数字电视广播、数字存储媒体和通信。 本标准设计用于覆盖广泛的应用范围，包括但不限于：光网络、铜缆等上的有线电视（CATV）、直接广播卫星视频服务（DBS）、数字用户线路视频服务（DSL）、数字地面电视广播（DTTB）、互联网协议电视（IPTV）、交互式存储媒体（如光盘等）（ISM）、多媒体邮寄（MMM）、分组网络上的多媒体服务（MSPN）、实时对话服务（如视频会议、视频电话等）（RTC）、远程视频监控（RVS）。
IEEE Standard for Advanced Audio and Video Coding
本文件提供关于针对编码视频内容执行机器分析任务的编码器和接收系统优化的信息。它提供了近期实践的概念级概述，并对技术方面以及解释结果时应注意的事项进行了评论。本文件描述了近期研究并证明对某些机器分析任务的编码效率有益的技术。
Information technology — Artificial intelligence for multimedia — Part 3: Optimization of encoders and receiving systems for machine analysis of coded video content
This document specifies the syntax and an accompanying decompression process that is capable to represent continuous-tone grey-scale, or continuous-tone colour digital images without visual loss at moderate compression rates. Typical compression rates are between 2:1 and 18:1 but can also be higher depending on the nature of the image. In particular, the syntax and the decoding process specified in this document allow lightweight encoder and decoder implementations that limit the end-to-end latency to a fraction of the frame size. However, the definition of transmission channel buffer models necessary to ensure such latency is beyond the scope of this document. This document: —???? specifies decoding processes for converting compressed image data to reconstructed image data; —???? specifies a codestream syntax containing information for interpreting the compressed image data; —???? provides guidance on encoding processes for converting source image data to compressed image data.
Information technology — JPEG XS low-latency lightweight image coding system — Part 1: Core coding system (ISO/IEC 21122-1:2024, IDT)
本文件规定了AMR语音编解码器在源控制速率（SCR）操作期间，背景声学噪声评估、噪声参数编码/解码和舒适噪声生成的正确操作的详细要求。 本文件中描述的要求在所有支持AMR语音编解码器的用户美利体育官网首页网址（UE）中必须实施。 接收器要求在所有支持AMR语音编解码器的网络中必须实施，发射器要求仅适用于那些将使用下行链路SCR的网络。 如果本文件中描述的要求与[1]中包含的这些要求的定点计算描述之间存在差异，则以[1]中的描述为准。
Universal Mobile Telecommunications System (UMTS); Mandatory Speech Codec speech processing functions AMR Speech Codec - Comfort noise aspects (3G TS 26.092 version 3.0.1 Release 1999)
本文件给出了在自适应多速率全速率和半速率语音业务信道上进行不连续传输（DTX）期间，移动台（MS）和基站系统（BSS）中背景声学噪声评估、噪声参数编解码和舒适噪声生成的正确运行的详细要求。 本文件中描述的要求对于所有能够支持自适应多速率全速率和半速率语音业务信道的GSM移动台（MS）的实施是强制性的。 接收机要求对于所有能够支持自适应多速率全速率和半速率语音业务信道的GSM基站系统（BSS）的实施是强制性的，发射机要求仅适用于那些将使用下行链路DTX的基站系统。 如果本文件中描述的要求与GSM 06.73 [2]中包含的这些要求的定点计算描述存在差异，则以GSM 06.73 [2]中的描述为准。
Digital Cellular Telecommunications System (Phase 2+); Comfort Noise Aspects for Adaptive Multi-Rate (AMR) Speech Traffic Channels (GSM 06.92 Version 7.1.1 Release 1998)
