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NVIDIA DLSS 4.5正式发布！RTX全系显卡可用：游戏画面大提升_我的网站

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A | Influenza and other respiratory viruses are starting to circulate but so far remain lower than this time last year, according to the Centers for Disease Control and Prevention.As of Oct. 7, CDC's FluView weekly report showed that the percent of flu cases were relatively unchanged, rising about 1% compared to the week prior.In that same timeframe, 1,127 people were hospitalized with influenza, up from 1,050 people the week prior. About 35% of all flu hospitalizations were reported in the southeast of the U.S., which experts say is a typical trend at the start of the flu season.Most of the flu cases detected were Influenza A and the most common subtype was Influenza A(H1N1), which is the strain of the virus that the flu vaccine usually offers better protection from, according to the CDC.The percent of all reported respiratory viruses circulating over the past week have been relatively unchanged nationally, but there is regional variability. Region 9 -- made up of Arizona, California, Hawaii, and Nevada -- was the only region that saw an increase.Still, the numbers in all regions of the U.S. remain below their baseline and outpatient respiratory illness activity is either minimal or low throughout most of the U.S., according to the CDC.Alaska is the only state that is currently experiencing moderate respiratory illness activity. Influenza typically circulates this time of year and peaks between December and February for most of the U.S., according to the CDC.Respiratory syncytial virus (RSV) numbers are on the rise and are projected to increase further, according to the CDC's weekly surveillance. RSV typically circulates from October to April, according to the CDC.

How to prepare for this year's cold and flu season

This time last year, the U.S. was bracing for a "tripledemic" amid rising cases of COVID-19, influenza and RSV after the seasons became more unpredictable during the COVID-19 pandemic.Dr. John Brownstein, chief innovation officer at Boston Children's Hospital and an ABC News contributor, said these early cases are behaving in a more predictable pattern."The data is pointing to something a little bit more par for the course. We're seeing the early rise of RSV and flu at a time when you'd expect it," Brownstein said.Brownstein, however, cautioned that cases of respiratory viruses are expected to increase further and higher levels still have potential to strain health systems and cause severe illnesses, Brownstein said."I think there's still concern around the threat of all three respiratory viruses plus, of course, the rest of the seasonal mix [of viral illnesses], wreaking havoc on our health systems," he said.Experts are hopeful that new and updated immunizations that protect against COVID-19, influenza and RSV will stave off the strain on health care systems.These viruses may only cause mild illness for many people, but young babies, pregnant women, people who are immunocompromised and the elderly are at highest risk for severe disease.Everyone 6 months and older is eligible for an updated COVID-19 shot and the annual flu vaccine.The Department of Health and Human Services told ABC News that, so far, more than 7 million updated COVID-19 shots have been administered. The CDC recommends getting the COVID-19 and flu vaccines by the end of October and encourages both to be given at the same time.Adults who are 60 years and older can get an RSV vaccine and pregnant women who are in their third trimester can get an RSV shot that provides protection against RSV to their baby for the first 6 months of life.Babies less than 8 months old who are born to mothers who did not get an RSV vaccine during pregnancy can get a protective shot called nirsevimab that offers about five months of protection against RSV.Nirsevimab is a one-dose shot made of monoclonal antibodies, which are proteins manufactured in a lab and mimic the antibodies the body naturally creates when fighting an infection. This is different than a vaccine, which activates the immune system.Brownstein said the pandemic has helped make many health systems better prepared for seasonal spikes in respiratory viruses and is hopeful that people are more motivated to stay up to date on shots that are available for protection and prevention this respiratory virus season."Now is really the time to get the protection advanced of the seasons really heating up," Brownstein said.Dr. Jade A Cobern, M.D., M.P.H, a licensed and practicing physician, is a member of the ABC News Medical Unit.。 8月26日消息，NVIDIA正式发布了DLSS 4.5光线重建技术，采用全新第二代Transformer模型，适用于所有RTX GPU，包括RTX 20、30、40、50全系显卡，通过最新NVIDIA App即可启用。

B | DLSS光线重建是一项神经网络渲染技术，用于提升光线追踪和路径追踪场景的画质。

C |     传统光追渲染中，每条光线只采样场景的一部分信息，直接输出的画面充满噪点，需要降噪器将多帧噪声画面合成成清晰图像，传统降噪器需要人工调校，效果受限于开发者的经验和投入。
DLSS光线重建工作流程：1080p噪声输入经Transformer模型处理后输出4K光追图像     NVIDIA的方案是用经过超级计算机训练的AI网络替代人工降噪器，生成采样光线之间更高质量的像素。该模型将降噪和超分辨率融合到同一个网络中，通过智能分析时间和空间引擎数据，重建出更清晰、更稳定、保真度更高的高分辨率图像。    据官方介绍，DLSS 4.5光线重建主要带来以下几项重大改进：     1、高效降噪器：新模型的计算能力提升了35%，处理的参数数量增加了20%，同时保持了与上一代模型相似的性能。    2、增强版超分辨率：在DLSS 4.5超分辨率的基础上，该模型在每个场景中都具有更深入的空间感知能力，并更智能地使用游戏引擎像素采样和运动数据。其结果是光照精度提升、时间稳定性改善以及光线追踪和路径追踪内容中的动作更加清晰。    3、扩展训练数据集：使用更大的数据集进行训练，新模型在图像重建方面表现更出色。这种智能使得模型能够更好地感知并选择最准确的引擎数据，以重建更接近真实场景的图像。    4、开发者精细化调控：全新模型搭配专属开发者遮罩工具，让开发者可进行更细致的参数调节，精准优化算法表现，进一步提升图像质量。
第二代Transformer模型带来更大降噪器和更深空间感知     随着DLSS 4.5光线重建正式发布，整套DLSS技术栈均已完成增强与更新，包含多项技术：仅限RTX 50系列的动态多帧生成和6倍多帧生成，支持RTX 40和50系列的帧生成，RTX全系列支持的光线重建、超分辨率和DLAA。         DLSS 4.5光线重建的改进在各款游戏中都有直观体现，《夺宝奇兵：古老之圈》中，新模型提供了更清晰的粒子效果，地下墓穴场景中，火把照亮地面的范围和渐变层次更自然，石头表面的贴图细节在动态光照下更清晰。
《夺宝奇兵：古老之圈》对比：右侧DLSS 4.5粒子效果更清晰     《识质存在》科幻走廊场景中，红色激光轨迹的拖影基本消除，每条激光的响应更加即时，走廊天花板的光带反射也更干净，不再有旧版中偶尔出现的噪点。
《识质存在》对比：右侧DLSS 4.5光照响应速度提升，激光残影减少     《心灵杀手2》中清晰度与稳定性大幅提升，旧版光线重建会将CRT老式电视屏幕的静电纹理过度平滑，新版能还原出更真实的噪点细节。角色面部的环境光遮蔽也更准确，暗部细节不再被过度抹平。

D |
《心灵杀手2》对比：右侧DLSS 4.5保留CRT电视白噪条纹细节，光照精度提升 要使用DLSS 4.5光线重建，用户需要下载最新的GeForce Game Ready驱动580.88 WHQL或更新版本。

E | 安装后在NVIDIA App中前往设置>关于，然后选择加入抢先体验版（该功能将于9月正式上线）。安装完成后，打开“图形”并选择支持的游戏，或选择窗口顶部的全局设置将光线重建应用于库中每款受支持的游戏。滚动至驱动程序设置，点击DLSS优设-模型预设，点击自定义，打开光线重建下拉菜单，选择推荐或预设F，最后点击应用即可。