SAA8110G/C1 Ver la hoja de datos (PDF) - Philips Electronics
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SAA8110G/C1 Datasheet PDF : 36 Pages
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Philips Semiconductors
Digital Signal Processor (DSP) for
cameras
Preliminary specification
SAA8110G
FUNCTIONAL DESCRIPTION
Black offset preprocessing
The input data is clamped within the optical black pixel
area of the CCD. The size of the digital clamp window is
16 pixels by 128 lines (i.e. TDA8786). It is possible to
differentiate black levels for odd/even lines, pixels and
fields. This comes in addition to the analog preprocessing
clamp which is active on the clamp pulse generated by the
external timing circuit. The analog clamp is included in the
TDA8786.
RGB separation
PAL/NTSC sensors generate interlaced data adding offset
in the complementary colour pixels. The RGB separation
block with its two line memories generates the three
components Y, 2R − G, and 2B − G for each input data
corresponding to a pixel value of the CCD. Then the
triplet R, G, B is derived. This block also delivers some
contour and white clip information.
RGB processing
The RGB processing includes several features:
• Colour space matrix depending on CCD type to be
suitable with different sensor colour filters
• Gain correction for R and B signals for white balance
control
• Black offset
• Adjustable knee
• Adjustable gamma function.
The knee function is applied to all three RGB signals.
Its shape is continuously adjustable by changing the slope
and the knee offset point.
To compensate for the non-linear response of display
devices, a gamma correction is applied to R, G and B
signals. It may be adjustable from linear to a 0.35 power
coefficient.
handbook, full pagewidth
CCD inputs
LINE
MEMORY
LINE
MEMORY
10
RGB
COLOUR
SEPARATION
Fig.3 RGB separation diagram.
R
G
B
white clip
vertical contour
MGK153
handbook, full pagewidth
R
G
B
COLOUR
MATRIX
Rgain
×
Bgain
×
Rblack
+
Gblack
+
Bblack
+
3×
KNEE
1997 Jun 13
Fig.4 RGB processing.
8
R
3×
GAMMA
G
B
MGK154
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