What is the full form of HD?
HD: High Definition
HD stands for High Definition. It refers to the new standard for image resolution, i.e., high definition images. It is a display resolution of higher resolution than standard definition (SD). A high definition (HD) image is known for its clarity and high resolution, etc. The clarity of images or videos of a television, desktop, laptop, etc., depends on the display resolution. An HD Television, desktop or laptop will display images of higher resolution than SD (standard definition).
Although there is no standardized definition of HD, any video image that has over 576 vertical lines in Europe and 480 vertical scan lines in North America is considered an HD video image. Besides this in some cases, images captured by the high-speed camera at over 50 frames/ second in Europe and 60 frames/sec in North America are considered HD images.
Besides this, there are various terms such as HD Ready, Full HD and Ultra HD or 4K. These terms denote the resolution of the display of a TV, Laptop, etc.
- HD ready or HD offers 1280 x 720 pixels which means 720p image resolution that has 720 lines of pixels along the vertical axis and 1280 along the horizontal axis.
- Full HD offers 1920x 1,080 pixels and
- Ultra HD or 4K offers 3840x2160 pixels.
The image quality depends on the resolution, i.e., the higher the resolution, the better the image quality.
Benefits of HD:
Some of the major benefits of HD technology are given below:
- Improved colour quality: A HDTV offers more vivid colours and a large variety of hues. You can see the bright colours of fishes while watching a wildlife documentary or can see the bold green colour of grass while watching a match on your TV. Similarly, HD CCTV cameras offer you crystal clear videos that can be used as evidence.
- Wide screen viewing: A HDTV offers a wider screen view. It generally comes with a 16:9 wide-screen format so you can watch it from different angles in your room. Similarly, a HD CCTV camera can capture and monitor a wider area. So, you need fewer cameras to cover the same space.
- Better clarity: The high resolution of HD offers you better clarity and details that you would otherwise miss such as blue coloured eyes of an actor, the sweat dripping off a player's forehead, etc.
- Convenient: An HDTV is comparatively thin and light weight than older versions. It can be easily mounted on the wall, so you don't need bulky furniture for TV that takes up your living space.
- Similarly, there are lots of other areas where HD video and images play a major role in improving the quality of a service such as HD video conferencing, video call, etc., where you can see the persons clearly with whom you are taking. Similarly, while taking online classes you can see the details, images, graphs, etc., clearing and thus can get maximum benefits from the class.