SAA8116 Datasheet, PDF(14/60 Page) NXP Semiconductors – Digital PC-camera signal processor including microcontroller and USB interface

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SAA8116 Datasheet, PDF (14/60 Pages) NXP Semiconductors – Digital PC-camera signal processor including microcontroller and USB interface

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Philips Semiconductors

Digital PC-camera signal processor including

microcontroller and USB interface

Product speciï¬cation

SAA8116

COLOUR MATRIX

A programmable 3 Ã 3 colour matrix (see Fig.6) is used to convert the extracted colour information, R, G and B from the

sensor colour space to a standard RGB colour space.

With B and W sensors, a unity matrix is used.

To control the white balance, the gain of the red and blue stream can be changed.

Gamma and knee are combined in one function with adjustable gain.

handbook, full pagewidth

R or (2R-G)

G or Y

B or (2B-G)

Rgain

GAMMA/

COLOUR

MATRIX

KNEE

Bgain

FCE742

Fig.6 RGB processing diagram.

YUV PROCESSING

Following the RGB processing, the R, G and B signals are

converted to YUV 4 : 2 : 2 by a fixed matrix (see Fig.7).

Then, the luminance and chrominance signals are

processed separately.

The luminance processing consists of edge enhancement.

This feature is very flexible. First, it is possible to adjust the

bandwidth and the level of the edge detection. Secondly,

the amount of edge enhancement can be independently

adjusted for the horizontal or vertical edge or for the high

or low frequency edge.

The chrominance processing consists of a colour killer

(white clip) and a UV gain control (see Fig.8). Processing

is done on the multiplexed two-times-downsampled

UV chrominance signals. The sensor input is used to kill

the colour of over-exposed pixels. It is possible to adjust

the number of pixels on which the correction is applied.

The YUV processing block concludes with separate gain

controls on the Y, U and V signals. These gains can be

used to fine tune the Y, U and V colour balance and also

to adjust the luminance and saturation without disturbing

the AE and AWB control loops.

CONVERSION

MATRIX

DOWN-

SAMPLING

AND MUX

FCE342

Fig.7 RGB to YUV conversion.

handbook, halfpage

WHITE CLIP

UV GAIN

CONTROL

FCE743

Fig.8 UV processing.

2001 May 04

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