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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, Laserdisc, digital television when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs.
Playing back interlaced video from a DVD, digital file or analog capture card on a computer display instead requires some form of deinterlacing in the player software and/or graphics hardware, which often uses very simple methods to deinterlace. This means that interlaced video often has visible artifacts on computer systems.
A line doubler is a device or algorithm used to deinterlace video signals prior to display on a progressive scan display. The main function of a deinterlacer is to take an interlaced video frame which consists of 60 two-field interlaced fields of an NTSC analogue video signal or 50 fields of a PAL signal, and create a progressive scan output ...
The main difference between the interlace concept in bitmaps and in video is that even progressive bitmaps can be loaded over multiple frames. For example: Interlaced GIF is a GIF image that seems to arrive on your display like an image coming through a slowly opening Venetian blind. A fuzzy outline of an image is gradually replaced by seven ...
All digital, or "fixed pixel," displays have progressive scanning and must deinterlace an interlaced source. Use of inexpensive deinterlacing hardware is a typical difference between lower- vs. higher-priced flat panel displays (Plasma display, LCD, etc.).
Interlacing affects how motion is perceived in 1080i. Since each field represents a slightly different moment in time, motion can appear smoother compared to lower frame rate progressive scans. However, this also means 1080i can struggle with fast-moving scenes. The interlaced fields might not perfectly align, leading to motion artifacts.
What is seen onscreen is two of these fields, "interlaced" together, to produce a single full frame. This comes from the proper longhand designation being vertical resolution, followed by the interlaced/progressive notation, and then the frame rate. So typical DV video is correctly listed as 480i/30. The long hand for 24p is 480p/24.
First is the potential for distracting motion artifacts due to interlaced video content. The solution is to either up-convert only to an interlaced BT.709 format at the same field rate, and scale the fields independently, or use motion processing to remove the inter-field motion and deinterlace, creating progressive frames. In the latter case ...