pnx1500 NXP Semiconductors, pnx1500 Datasheet - Page 360
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pnx1500
Manufacturer Part Number
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
2.3.2 Pixel Formatter Unit (PFU)
2.3.3 Chroma Key and Undither (CKEY/UDTH) Unit
complete before the start of the next horizontal blanking interval). In the current
design, the VBI packet can be inserted only between the EAV and the SAV time
codes.
The PFU retrieves the raw data stream, for a particular image source, from the
system memory and formats it according to the specified pixel format.
summarizes the various native pixel formats supported by the PFU.
Table 1: Summary of Native Pixel Formats
Remark: Semiplanar YUV 4:2:0 is supported by the software API. However the
support is achieved by duplicating the UV samples. Therefore it is not a true 4:2:0
support. True 4:2:0 support can be achived by using the MBS module to convert the
4:2:0 pixels into 4:2:2 or 4:4:4 pixels before entering QVCP.
Remark: The PFU does not do the pixel conversion it just formats properly the raw
data into the QVCP pipeline, therefore it requires to know the input pixel format.
Chroma keying allows overlaying of video and/or graphic layers, depending on
whether the considered pixel lies within a specified color range. This feature allows
video transparency or “green screening” — a technique used for compositing a
foreground imagery with a background. Undithering allows recovery of 9 bits of
precision from the dithered 8 bits stored in memory (where QVCP fetches the pixels
for video processing).
CKEY
Chroma key matching is usually performed on a range of values rather than on a
single value as in color keying; a Key Mask is provided to allow chroma keying on
specific bits within the data word considered. In QVCP, the color key is generated in
each layer in the source color space. Every layer can use up to four color keys.
Format
1 bpp indexed
2 bpp indexed
4 bpp indexed
8 bpp indexed
RGBa 444
RGBa 4534
RGB565
RGBa 8888
Packed YUVa 4:4:4
Packed YUV 4:2:2 (UYVY)
Packed YUV 4:2:2 (YUY2,
2vuy)
Semiplanar YUV 4:2:2
Rev. 3 — 17 March 2006
Description
CLUT entry = 24-b color + 8-b alpha
CLUT entry = 24-b color + 8-b alpha
CLUT entry = 24-b color + 8-b alpha
CLUT entry = 24-b color + 8-b alpha
16-b unit, containing 1 pixel with alpha
16-b unit, containing 1 pixel with alpha
16-b unit, containing 1 pixel, no alpha
32-b unit, containing 1 pixel with alpha
32-b unit, containing 1 pixel with alpha
16-b unit, 2 successive units contain 2 horizontally-adjacent
pixels, no alpha
16-b unit, 2 successive units contain 2 horizontally-adjacent
pixels, no alpha
Separate memory planes for Y and UV (both 8 and 10 bpp)
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PNX15xx Series
Chapter 11: QVCP
Table 1
11-7
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