77
Chapter 6: Video Driver Topics
* YVU9 planar - Similar to YUV12 planar,
except that there are in the aggregate
9 bits of data per pixel, and each byte
pair of chrominance data is shared by 16
adjacent pixels arranged in
a 4x4 square. See YUV Format Details.
* RGB32 - Each pixel has four bytes (32
bits) of data - one each for red, green,
and blue, plus one byte that is unused.
The pixel has 256 shades of each of the
three colors, for a total of 16.7 million
colors.
* RGB24 - Each pixel has three bytes (24
bits) of data - one each for red, green,
and blue. This is another “true color”
mode with 16.7 million colors.
* RGB555 - Each pixel has two bytes (16
bits) of data. There are 5 bits each of red,
green, and blue data; the sixteenth bit is
unused. This is a “high color” mode, also
known as “5:5:5.”
* RGB8 (Greyscale) – The Osprey AVStream
driver uses the RGB8 format for greyscale
video. RGB8 is a palletized format. Each
pixel is represented by one byte, which
indexes one of 256 colors in a color
palette specified by the driver. The
Osprey driver sets the color palette to
greyscale entries, and captures “Y8”
luminance-only data.
YUV Format Details
YUY2, UYVY, YVU9, and YUV12 are YUV formats.
In these formats, each pixel is defined by an
intensity or luminance component, Y, and two-
color or chrominance components, U and V.
Since the human eye is less sensitive to color
information than to intensity information, many
video formats save storage space by having
one luminance byte per pixel while sharing the
chrominance byte among two or more pixels.
YUV is also very similar to the color encoding
used for analog color television broadcast
signals.
Summary of Contents for Osprey-300
Page 1: ...Osprey 300 User s Guide...
