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Osprey-300 User’s Guide
The standard frame sizes are different for
NTSC and PAL. For example, the half-frame size
in pixels is 360x240 for NTSC, and 360x288
for PAL. The driver automatically adjusts the
reference size and default size for the video
standard you are using.
Note that the Osprey-300 always uses CCIR-601
horizontal proportioning, which is based on a
720-pixel full line width.
C
OLOR
F
ORMATS
The Color Format is the arrangement of data
bits representing the colors of each pixel. For
example, in the RGB555 format, each pixel of
data is stored as 5 bits of red, 5 bits of green,
and 5 bits of blue color information.
Video delivered by the Osprey board to the
system is in uncompressed format. It is possible
to compress the video at a subsequent stage
of processing. However, this dialog field refers
specifically to the uncompressed raw video that
the board delivers to the system.
The Osprey AVStream driver supports the
following capture pin formats.
* YUY2 and UYVY - Each pixel is
represented with a total of 2 bytes (16
bits) of data. The data is encoded as
separate data for luminance (intensity)
and chrominance (color). This mode
is mainly used as an input to software
compressors. See YUV Format Details
below.
* YUV12 planar - Also known as I420. This
is a complex format in which there are in
the aggregate 12 bits of data per pixel.
Each pixel has 8 bits of luminance data.
Each group of 4 adjacent pixels arranged
in a 2x2 square shares two bytes of
chrominance data. See YUV Format
Details.
Standard Video Sizes
(WidthxHeight)
525 Line
(CCIR601)
625 Line
(CCIR601)
Full
720x480
720x576
1/2 CIF
360x240
360x288
3/8
270x180
270x216
1/4 CIF
180x120
180x144
Summary of Contents for Osprey-300
Page 1: ...Osprey 300 User s Guide...
