The term High Definition television is basically used for any video broadcast that has resolution higher than regular television. The pixel count of an HD broadcast is one or two million pixels per frame, approximately five times a standard broadcast. In the initial stages, analog techniques were used in HDTV broadcasts, but in recent times, the same has given way to digital broadcast via video compression.
There are basically three components of an HDTV broadcast system:
· Frame size: This refers to the number of horizontal pixels multiplied by the number of vertical pixels in a frame. Usually, the number of horizontal pixels is omitted, and only the vertical ones are shown in the rating, like 1080i and 720p.
· Scanning system: There are two types – progressive scanning (denoted by the letter 'p' in resolution), and interlaced scanning (denoted by the letter 'i')
· Frame rate: The frame rate is basically the number of video frames per second.
All the three parameters are used in a format of [frame size][scanning system][frame or field rate], or [frame size]/[frame or field rate][scanning system]. It may happen that the frame size or rate might not be mentioned, with only the numeric parameter and scanning system letter. For instance, 1280X720i25 means an interlaced scanning at 25 frames per second, with each frame being 1280 pixels wide and 720 pixels in height.
Samsung high-definition televisions are the market leaders in providing fantastic picture quality, and are increasingly becoming a common phenomenon among Indian households.
No comments:
Post a Comment