Vertical Filtering.This is a technique used by most software PC DVD players, as well as many of the single-chip MPEG decoder/deinterlacer combos like Cirrus Logic, LSI, and Mediamatics. Because software decoders generally don’t have enough horsepower to do motion-adaptive deinterlacing and MPEG-2 decoding at the same time, the players use shortcut techniques to get reasonable-looking results. Most commonly, they weave together pairs of fields that are stored together as MPEG frames, and soften the image slightly in the vertical direction so any combs that result will look more like double images than combs. This causes loss of vertical resolution and bizarre-looking jitter on movement and pans. Once you notice it, it can become difficult to watch. Static areas of the image also look much softer than they need to, and the overall effect is watchable, but not great.
Motion-Compensated (Motion Vector Steered) Deinterlacing
This is something one generally only finds on very, very expensive deinterlacing solutions, and we mention it here for completeness. This involves doing elaborate image analysis to identify the moving areas of the image, and weaving together the same image from two fields, with individual areas shifted to compensate for the movement. It involves a lot of processing power, and is not found on any DVD player we know of.
Eto dva primjera totalno suprotna. Dakle dobar player bi trebao biti negdje između.