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Loading ...Instead of using the conventional 576 lines to plot a TV picture High Definition Television (HDTV) displays the finest quality picture available in the home entertainment market by using 720 or 1080 lines. In order to allocate for the extra lines the pixels in each line are moved closer providing an improved picture quality with clearness and colour refinement.
What’s the difference between 720p, 1080i and 1080p ?There are formats which HDTV broadcast its pictures.
720p
The “p” stands for progressive, which is an image comprised of 1280 lines along the horizontal by 720 vertical lines. The image is shown as a single frame, progressively.
1080i
The image detail in increased with1080i which measures 1920 x 1080 lines and is displayed as two fields that are interlaced. However the interlace image is not as smooth as a progressively scanned one.It is possible for a HDTV with 720 lines will show both formats however it is important to remember to get the peak level picture a 1080-line screen will show 1080i footage at its best in an un-scaled form.
1080p
This is the best form of HD. These ‘Full HD’ screens displaying 1080p appearing are becoming more and more popular. A 1080p screen can de-interlace a 1080i signal or upscale a standard definition one. At present the disadvantage is that 1080p sources available are limited, however the benefit of a Full HD screen is its ability to view a source such as Sky TV 1080i, pixel for pixel to the screens resolution 1920 x 1080.At present movies made in 1080p which might appear in Blu-ray or HD DVD format. Sony’s PlayStation 3 produces 1080p output.
* De-interlace = To combine two interlaced fields into a single frame and render them at for example 30 frames per second (fps). Deinterlacing is done to remove artefacts and improve the quality of encoded video.
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Tags: How HDTV Works
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