Yamaha
has chosen industry-leading DCDi™ technology for its products
Brief
Explanation:
DCDi™
is a technology which makes images look more natural by automatically
filling in video information lost during the recording process.
Technical
explanation:
DCDi™
(Directional Correlational Deinterlacing) eliminates the jagged edges
(also known as “jaggies” or “the staircasing effect”)
that appear when standard interlaced video is de-interlaced and viewed
on a progressive scan display.
Moving film
to digital video is a complex process, wrought with inherent limitations.
The most notable visual artifacts (an artifact is an unintended visual
flaw created by some underlying technical process) are jagged edges. This
undesirable effect is now proactively eliminated, during playback, by
angle-correlated vector interpolation algorithms.
Typical
motion video processing relies on something called intra-field spatial
interpolation to generate the missing lines of video from interlaced
sourced material. This approach successfully suppresses motion artifacts;
however, moving images and diagonal edges (actually, all edges which are
not strictly horizontal or vertical) create jagged edge artifacts. While
missing lines are successfully generated, the information generated does
not exactly match that of the edges of the object originally filmed.
DCDi™,
by Faroudja, takes the idea of interpolation to a much higher level. It
interpolates based on how objects are moving in a scene, basing its calculations
on the “big picture” instead of relying on a limited mathematical
model. More specifically, it identifies all of the moving edges in a scene
while adjusting the angle of interpolation at each pixel so that the interpolation
always follows the edge instead of crossing it. This revolutionary approach
not only eliminates jagged edges, but also achieves something that has
not been available in affordable systems until now: true-to-life looking
images from an interlaced source.
Related
Link:
DCDi™
Overiew by Stacey Spears and Brian Florian
DCDi™
is a trademark of Faroudja, a division of Genesis Microchip Inc.
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