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MXIII 4K Google TV Box

TOPIC: What is 4K resolution? 何謂4K解析度?

What is 4K resolution? 何謂4K解析度? 4 years 4 months ago #55

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4K解析度(4K resolution)是種新興的數位電影及電腦視訊的超高解析度標準,常見的解析度有3840×2160和4096×2160畫素2種規格。「4K」名稱得自其水平方向的畫素數。

要看 4K 的影片需要有足夠高的頻寬,而 25Mbps 是最基本的要求,這也是美國FCC定義寬頻的新標準。
美國聯邦通信傳播委員會(FCC)在2014年度寬頻發展報告中,對「寬頻」進行了重新定義,從原定的下載速度從 4Mbps 調整至 25Mbps,原定的上傳速度從 1Mbps 調整至 3Mbps,並正式向美國境內的各大網路ISP業者發出指導意見書,要求加強寬頻的部署建設。


4K resolution, also called 4K2K, refers to a display device or content having horizontal resolution on the order of 4,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography. In the movie projection industry, Digital Cinema Initiatives (DCI) is the dominant 4K standard.

4K has become the common name for ultra high definition television (UHDTV), although its resolution is only 3840 x 2160 (at a 16:9, or 1.78:1 aspect ratio), which is lower than the 4K industry standard of 4096 x 2160 (at a 19:10 or 1.9:1 aspect ratio).

The use of width to characterize the overall resolution marks a switch from the previous generation, high definition television, which categorized media according to the vertical dimension instead, such as 720p or 1080p. Under the previous convention, a 4K UHDTV would be equivalent to 2160p

YouTube and the television industry have adopted Ultra HD as its 4K standard.

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Last Edit: 4 years 2 months ago by googadmin.
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