由于4K超高清(Ultra High Definition,UHD)和高动态范围(High Dynamic Range,HDR)技术的快速发展及其在广播电视制播中的广泛应用,传统广播电视台急需进行技术升级和系统优化。在这一背景下,4K超高清融媒体转播车视频系统的设计与优化...由于4K超高清(Ultra High Definition,UHD)和高动态范围(High Dynamic Range,HDR)技术的快速发展及其在广播电视制播中的广泛应用,传统广播电视台急需进行技术升级和系统优化。在这一背景下,4K超高清融媒体转播车视频系统的设计与优化尤为关键。视频系统不仅需要处理更高分辨率的视频信号,而且必须兼顾HDR内容的传输与处理,还要保持与现有制播流程的兼容性。基于此,系统地对4K超高清融媒体转播车视频系统进行设计优化,包括对摄像机、切换台以及数据交换系统的优化设计,旨在提升视频系统的整体性能,确保高质量的直播信号传输和处理,同时增强系统的灵活性和未来兼容性,为观众提供更加出色的视听体验。展开更多
超高清电视(UHDTV,Ultra High Definition TV)凭借其超高的屏幕分辨率可以更细腻地展现视频的内容,受到越来越多用户的青睐,然而目前超高清节目源发展有限,通常只能将低于超高清电视屏幕分辨率的视频经过插值后播放,这样处理可能会对用...超高清电视(UHDTV,Ultra High Definition TV)凭借其超高的屏幕分辨率可以更细腻地展现视频的内容,受到越来越多用户的青睐,然而目前超高清节目源发展有限,通常只能将低于超高清电视屏幕分辨率的视频经过插值后播放,这样处理可能会对用户主观体验带来一定的影响。如何准确评估UHDTV多分辨率视频源对视频显示质量的影响,对UHDTV业务的部署和优化起到指导性的作用。本文通过主观实验,利用SSIM算法预测视频源编码质量,并进一步分析视频源分辨率对UHDTV视频显示质量的影响,提出一种面向UHDTV的视频显示质量评估模型。实验结果表明,相比SSIM、VIFp和MOVIE三种经典的视频质量评估算法,本文模型所得视频显示质量和主观质量之间的皮尔森系数分别提高1.13%、1.89%和2.31%,斯皮尔曼等级相关系数分别提高1.35%、1.53%和2.24%,RMSE降低35.05%、36.94%和39.71%。所提模型可以更加准确地评价UHDTV视频显示质量。展开更多
The goal of an UHDTV is to broadcast digital video contents which is 16 times the pixel resolution of HDTV. As the resolution is increased, the UHDTV requires a transmission technology to support very high data transf...The goal of an UHDTV is to broadcast digital video contents which is 16 times the pixel resolution of HDTV. As the resolution is increased, the UHDTV requires a transmission technology to support very high data transfer rate. In this paper, we propose two out-of-band protocols to transmit UHDTV contents in a CATV network: an OOB-based protocol and a DSG-based protocol. The former may be a short term solution which is well suitable for a traditional CATV network and the letter may be a long term solution which is adoptable for a CATV network equipped with DOCSIS functionalities. In order to transfer 200 Mbps UHDTV contents, proposed protocols use a channel bonding mechanism which combines several QAM channels. We propose CATV network architectures to support an UHDTV service with a channel bonding mechanism, and design the format of messages to share the information of bonded channels between a headend and a STB. We develop an OPNET simulator and ascertain successful transmission of UHDTV contents.展开更多
文摘由于4K超高清(Ultra High Definition,UHD)和高动态范围(High Dynamic Range,HDR)技术的快速发展及其在广播电视制播中的广泛应用,传统广播电视台急需进行技术升级和系统优化。在这一背景下,4K超高清融媒体转播车视频系统的设计与优化尤为关键。视频系统不仅需要处理更高分辨率的视频信号,而且必须兼顾HDR内容的传输与处理,还要保持与现有制播流程的兼容性。基于此,系统地对4K超高清融媒体转播车视频系统进行设计优化,包括对摄像机、切换台以及数据交换系统的优化设计,旨在提升视频系统的整体性能,确保高质量的直播信号传输和处理,同时增强系统的灵活性和未来兼容性,为观众提供更加出色的视听体验。
文摘超高清电视(UHDTV,Ultra High Definition TV)凭借其超高的屏幕分辨率可以更细腻地展现视频的内容,受到越来越多用户的青睐,然而目前超高清节目源发展有限,通常只能将低于超高清电视屏幕分辨率的视频经过插值后播放,这样处理可能会对用户主观体验带来一定的影响。如何准确评估UHDTV多分辨率视频源对视频显示质量的影响,对UHDTV业务的部署和优化起到指导性的作用。本文通过主观实验,利用SSIM算法预测视频源编码质量,并进一步分析视频源分辨率对UHDTV视频显示质量的影响,提出一种面向UHDTV的视频显示质量评估模型。实验结果表明,相比SSIM、VIFp和MOVIE三种经典的视频质量评估算法,本文模型所得视频显示质量和主观质量之间的皮尔森系数分别提高1.13%、1.89%和2.31%,斯皮尔曼等级相关系数分别提高1.35%、1.53%和2.24%,RMSE降低35.05%、36.94%和39.71%。所提模型可以更加准确地评价UHDTV视频显示质量。
文摘The goal of an UHDTV is to broadcast digital video contents which is 16 times the pixel resolution of HDTV. As the resolution is increased, the UHDTV requires a transmission technology to support very high data transfer rate. In this paper, we propose two out-of-band protocols to transmit UHDTV contents in a CATV network: an OOB-based protocol and a DSG-based protocol. The former may be a short term solution which is well suitable for a traditional CATV network and the letter may be a long term solution which is adoptable for a CATV network equipped with DOCSIS functionalities. In order to transfer 200 Mbps UHDTV contents, proposed protocols use a channel bonding mechanism which combines several QAM channels. We propose CATV network architectures to support an UHDTV service with a channel bonding mechanism, and design the format of messages to share the information of bonded channels between a headend and a STB. We develop an OPNET simulator and ascertain successful transmission of UHDTV contents.
