SAA8116ET 데이터 시트보기 (PDF) - Philips Electronics

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SAA8116ET

Digital PC-camera signal processor including microcontroller and USB interface

Philips Electronics 

Philips Semiconductors

Digital PC-camera signal processor including

microcontroller and USB interface

Product specification

SAA8116

Video signal processor

OPTICAL BLACK PROCESSING

The first processing block of the SAA8116 is a digital

clamp (denoted as PRE-PROCESSING in Fig.1). It is used

to align the optical black level to zero or to any arbitrary

value.

The average value of the black is measured in the

programmable optical black window and sent to the

microcontroller for adjustment, if necessary. The value

fixed by the microcontroller is subtracted from the

incoming data stream.

The optical black window has a fixed size of 16 pixels

(horizontally) by 128 (vertically); the position of this

window is fully programmable.

Each of the four colour filter inputs has its own offset and

gain.

DEFECT PIXEL CONCEALMENT

Up to 128 Defect Pixel Coordinates (DPC) can be taken

into account for concealment. The method is based either

on a horizontal linear interpolation, or on a copy of a

neighbouring pixel of the same colour.

RGB COLOUR RECONSTRUCTOR

In the RGB colour reconstructor (denoted as RGB

RECONSTRUCTION in Fig.1), an RGB triplet is

interpolated for every pixel on a 3 × 3 neighbourhood

matrix.

With B and W sensors, the RGB colour reconstructor can

be disabled, thus maintaining the full sensor resolution.

Vertical contours and video level information (white clip)

are extracted at this stage (see Fig.5).

handbook, full pagewidth

CCD inputs

LINE

MEMORY

LINE

MEMORY

10

RGB

COLOUR

SEPARATION

FCE340

R

G

B

White clip

Edges

Fig.5 RGB reconstructor diagram.

2001 May 04

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