User:Imaginistics/Sandbox

Basic Definition of HD Streaming
High-Definition Streaming, or HD Streaming, is a term that utilizes the definition of HD from the television environment (HDTV) as a broadcast with higher resolution than traditional television systems (standard-definition TV, or SDTV).

Resolution
Resolution refers to the quality of the picture on a screen as defined by its width, height, pixels and the number of horizontal lines on the screen. HD Streaming is high resolution content is delivered to devices over the Internet.

Non-Technical Description
In non-technical terms, HD content presents a richer image. The video is several times sharper because there are more lines that enable more detail. While there may be no smaller televisions there may be no noticeable improvement in picture quality on the computer screen or small TV, when projected to a large TV or digital theater screen, there is a noticeable improvement in picture quality by comparison.

Standard Definition
According to the NTSC-M standard, SDTV is defined as having a resolution of 720x480. Since there are 480 horizontal lines of resolution from top to bottom, SD is simply referred to as 480i/p. The advertised megapixels are 345,600 (0.3) with a display aspect ratio (X:Y) of 4:3.

Standard definition according to PAL-I standards is 720×576, with 414,720 (0.4) megapixels and the same display aspect ratio of 4:3. It is known as 576.

High Definition
High Definition is typically defined as having a resolution of 1280x720 (known as 720p) or 1920x1080 (1080p). This means there are 720 or 1080 horizontal lines of video from top to bottom. The advertised megapixels for 720p are 876,096 (0.9) with a display aspect ratio of 16:9. HD at 720p is used for 750-line video with raster artifact/overscan compensation as defined according to SMPTE 296M. The advertised megapixels of 1080p are 2,001,280 (2.0) with a display aspect ratio of 16:9. HD at 1080p is used for 1125-line video with faster artifact/overscan compensation, as defined in SMPTE 274M.

The lower-case "i" on 1080i denotes an interlaced stream. With the interlaced scanning method, the 1080 lines of resolution are presented in two deliveries. The first 540 lines (every other line) appear on the screen and then the remaining 540 lines fill in. The lower-case "p" denotes progressive. The progressive scanning method simultaneously displays all 1080 lines. While the picture is sharper, it requires more bandwidth.