Generally speaking, progressive scanning has its own advantages when
compared with interlaced scanning. First of all, the main advantage with
progressive scanning is that the motion will be smoother and more realistic. In
contrast, the interlaced video of the same rate will have a lot of visual
artifacts, such as interline twitter. When capturing video with progressive
scan, people have no such worries. It is safe to say that there will be an
absence of visual artifacts, which enables the captured image to be used as
still photos.
As a result, there is no need in intentional blurring, namely,
anti-aliasing, of video in order to reduce interline twitter and eye strain. As
a matter of fact, in the case of most media such as DVD movies and video games,
the video is automatically blurred during the authoring process itself to
subdue interline twitter when played back on interlace displays. Therefore, it
is entirely impossible to recover the sharpness of the original video if the
vide has been viewed progressively. A feasible solution to this problem is that
people are supposed to choose the display hardware and video games come
equipped with options to blur the video at will or to keep it at its original
sharpness. Under such circumstance, the viewer is able to achieve the desired image
sharpness no matter whether he is adopting interlaced or progressive displays.
Actually, progressive video is clearer and faster for scaling to
higher resolutions in comparison with its equivalent interlaced video. HDTVs
not based on CRT technology cannot natively display interlaced video. Therefore,
the interlaced video has to be deinterlaced before it is scaled and displayed
on HDTVs. However, in the deinterlacing process, some noticeable artifacts and
input lag between the video source and display device are likely to emerge.
