15
Compro 3D Y/C Separation User’s Guide
Introduction of 3D Y/C Separation
Television signals actually contain two signals, Luminance and Chrominance. By
convention, Y represents Luminance and C represents Chrominance. The Y
signal describes the brightness of the picture and C represents the color
information. Black and white TV signals contain only the Y signal. When color TV
was introduced many years ago, the Y and C signals were combined into a
composite
video signal. This has the advantages of being compatible with black
and white TV set and using less bandwidth. All TV sets must separate the Y and
C signals before presenting a picture.
The disadvantage of this scheme is that it is impossible to perfectly separate the
Y and C signals. If part of the Y signal is treated as C signal, the picture will show
rainbow-like color pattern as known as the Cross-Color Artifact phenomenon. If
part of the C signal is treated as Y signal, the picture will show the vertical or
horizontal dot lines color as known as the Cross-Luminance phenomenon. In
other words, better separation of the Y and C signals results in a clearer, sharper
picture with brighter and more accurate color. Incomplete separation of the Y and
C signals results in Cross-Color Artifact and Cross-Luminance phenomena.
Scientists developed many algorithms trying to solve these problems. Among
them, 2D and 3D Y/C separation algorithms have been widely adopted. These
algorithms are superior to the simple comb filters found on most TV sets today.
VideoMate X800 incorporate the Y/C separation
chip
to process Y/C separation
and noise reduction. The chip provides
2D Y/C separation
,
Digital Noise
Reduction
(DNR), and
3D Y/C separation
calculations in hardware, greatly
reducing Cross-Color Artifacts and Cross-Luminance problems. Combined with
the deinterlacing technology in ComproPVR, you can enjoy crystal clear video
and less eyestrain, giving you greater enjoyment of TV programs.Different
algorithms are optimal for different types of TV programs, for example, action,
news, or drama shows. 2D Y/C separation, for example, has the side effect of
turning oblique lines into hanging dots while 3D algorithms can cause blurring in
action videos. However, 3D Y/C separation algorithm is
not
available in SECAM
system. Here is the table for the availability.
Input Signal
TV
System
TV and Composite Video Input
S-Video Input
PAL &
NTSC
3D Y/C Separation
2D Y/C Sepa Digital Noise Reduction (DNR)
Digital Noise
Reduction (DNR)
SECAM
2D Y/C Sepa Digital Noise Reduction (DNR)
Digital Noise
Reduction (DNR)
