What is HD-resolution?

HD video is a record highdefinition with a higher resolution than the standard. There is no unambiguous definition regarding HD. What permission is appropriate for him depends on the particular region. So, in the North American countries traditionally any video containing more than 480 horizontal lines was considered a record of high definition. In European countries, it should have 570 such units. However, these figures are much higher these days.

Records that have HD resolution may havevarious sources: terrestrial or direct satellite broadcasting, digital cable television, CDs, digital cameras, Internet content and the latest generation of game consoles. Most computers are able to play such video thanks to the technologies of VGA, DVI and / or HDMI.

Optical standard Blu-ray disc canProvide ample space for storing several hours of high definition recording. Digital Versatile or DVD (with 4.7 GB or 8.5 GB with double-sided recording) is better reproduced on screens that are smaller than 36 inches (91 cm), because they often can not support high-definition HD (by modern standards) .

Depending on the available bandwidthand the number of parts the optimal format for video transmission is either 720p / 24 frames per second, or 1080 p / 24. In some countries, there are other standards - it uses a speed of 25 or even 30 frames per second. Earlier, when using video cassettes, the resolution was 480 or 576 pixels. Such records can be converted to 720p, but such formatting can distort the picture or require filtering, which actually reduces the quality of the output signal. Video format HDTV already has HD-resolution of 720 or 1080 p.

By common parameters, the format 720 is moreaccurate and fast, because when you play it, frames are loaded gradually. Standard 1080, unlike it, uses interlaced scanning, and thus can reduce the speed of video upload. For this reason, the 720p resolution is usually used to download video from the Internet or for viewing on the network, 1080 p for recording Blu-ray discs.

The number of streaming videos offered forviewing online or downloading on the Internet, grows daily. Despite the fact that such files are recommended as high-definition recording, it can not be asserted that they have HD resolution. Because of the strong compression and detailing of images created by these formats, their quality is much lower and often even inferior to DVD-Video.

In addition, an increasing number of producerssurveillance cameras offer products with high definition video recording. In this case, HD resolution is necessary, since the events recorded by the camcorder can play a significant role in some cases. This technology ensures proper color reproduction and frame rate. However, it must be remembered that such videos require an adequate amount of storage space.

Today, some gaming consoles supportGames that have an image in the 1080p format. This opportunity was immediately evaluated positively. In addition to enhancing the visual quality of the game, users also could download or transfer HD movies and video clips using the PlayStation Network. PlayStation 3 can also play Blu-Ray, which contain HD-data.