Lesson plan
deinterlacing
Deinterlacing is the process of converting interlaced video into a non-interlaced or progressive form. Interlaced video signals are commonly found in analog television, VHS, Betamax, Video 8, digital home video tapes such as Digital8 and DV tapes, CED Disc, LaserDisc, digital television when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs. An interlaced video frame consists of two fields taken in sequence: the first containing all the odd lines of the image, and the second all the even lines. Analog television employed this technique because it allowed for less transmission bandwidth while keeping a high frame rate for smoother and more life-like motion. A non-interlaced (or progressive scan) signal that uses the same bandwidth only updates the display half as often and was found to create a perceived flicker or stutter. CRT-based displays were able to display interlaced video correctly due to their complete analog nature, blending in the alternating lines seamlessly. However, since the early 2000s, displays such as televisions and computer monitors have become almost entirely digital—in that the display is composed of discrete pixels—and on such displays the interlacing becomes noticeable and can appear as a distracting visual defect. The deinterlacing process should try to minimize these.…
Article summary
Deinterlacing is the process of converting interlaced video into a non-interlaced or progressive form. Interlaced video signals are commonly found in analog television, VHS, Betamax, Video 8, digital home video tapes such as Digital8 and DV tapes, CED Disc, LaserDisc, digital television when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs. An interlaced video frame consists of two fields taken in sequence: the first containing all the odd lines of the image, and the second all the even lines. Analog television employed this technique because it allowed for less transmission bandwidth while keeping a high frame rate for smoother and more life-like motion. A non-interlaced (or progressive scan) signal that uses the same bandwidth only updates the display half as often and was found to create a perceived flicker or stutter. CRT-based displays were able to display interlaced video correctly due to their complete analog nature, blending in the alternating lines seamlessly. However, since the early 2000s, displays such as televisions and computer monitors have become almost entirely digital—in that the display is composed of discrete pixels—and on such displays the interlacing becomes noticeable and can appear as a distracting visual defect. The deinterlacing process should try to minimize these.…
Key claims
No claims recorded.
Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
No sources recorded.
Key claims and bibliography are generated from the same tracked claims and sources as the article page.