pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 364
pnx1500
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pnx1500
Description
Pnx15xx Series Connected Media Processor
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500.pdf
(828 pages)
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Philips Semiconductors
Volume 1 of 1
PNX15XX_SER_3
Product data sheet
2.3.4 Chroma Upsample Filter (CUPS)
2.3.5 Linear Interpolator (LINT)
2.3.6 Video/Graphics Contrast Brightness Matrix (VCBM)
The chroma (chrominance) upsampling module allows conversion of YUV 4:2:2 data
streams to 4:4:4 data streams by interpolating the missing chrominance information.
There exist two forms of 4:2:2 co-sited and interspersed. It depends on how the U&V
data was down-sampled from 4:4:4 to 4:2:2. Since both co-sited and interspersed
4:2:2 formats (as shown in
CUPS should be adapted accordingly. This feature is necessary for supporting RGB/
YUV outputs in full-color resolution.
The linear interpolator is used for horizontal up-scaling of graphics images. It is
specifically used for graphics images because its nature makes it unsuitable for
quality scaling of video material. However, due to its small size, the block is present in
both layers of QVCP. This unit supports up-scaling only, and can handle both YUV
and RGB data streams. It also supports scaling of the alpha channel as well as any
potential previously-extracted color keys. The output samples are calculated from the
input samples via a piece-wise linear interpolator. All pixel components are treated
equally.
Remark: Layer Size (final)) register has to be updated to match the scaled width, if
LINT scaling is changed.
The first purpose of VCBM is contrast (gain) and brightness (offset) control (in that
order). The contrast and brightness controls are for normalizing the amplitude (black
and white level) of all sources. They also permit balancing the visibility of all video
and graphics layers. An important benefit of having separate controls for all video and
graphics layers is that the user interface never needs to disappear, even if the user
tries to make (the video part of) the picture invisible. This benefit should be achieved
by control software: limit the control range for the user interface layers.
Figure 4:
4:2:2 Input
Co-Sited
Interspersed
4:4:4 Output
4:2:2 and 4:4:4 Formats
Rev. 3 — 17 March 2006
(U0, V0)
(U0, V0)
(U0, V0)
Figure
(U1, V1)
first luma, alpha samples in each line (Y0, A0)
chroma (U, V) samples
chroma (U, V) samples
4) are supported, the up-sampling method of
(U2, V2)
(U2, V2)
(U2, V2)
(U3, V3)
luma, alpha (Y, A) samples
(U4, V4)
(U4, V4)
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
(U4, V4)
luma (Y) samples
PNX15xx Series
(U5, V5)
(U6, V6)
(U6, V6)
Chapter 11: QVCP
(U6, V6)
(U7, V7)
11-11
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