STV0974 datasheet(10/69 Pages) STMICROELECTRONICS

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STV0974

Functional description

4.3

Video processing unit

4.3.1

Features

● Low-power dedicated hardware video processing unit, pipeline operation up to VGA resolution

30 Hz

● Image sensor correction stage including pixel defect correction and fixed pattern noise (FPN)

cancellation

● Color interpolation stage with anti-aliasing and color matrix compensation

● Optical system compensation stage including anti vignetting and sharpness enhancement

● Noise reduction filter

● Programmable gamma and s-curve gamma for LCD support

● Full frame statistics gathering for exposure and color balance controls

● Programmable output image size (downscale by 1.5, 2, 2.5, 3, 4, 5 and 6)

4.3.2

Overview

Fixed Pattern Noise (FPN) cancellation The FPN cancellation algorithm removes any column

variability over the video area.

Statistics gathering Image statistics are gathered on the full resolution input image and

forwarded to the camera control unit for exposure and color balance control loops.

Anti vignetting A radial gain is applied to the image luminance to compensate for possible

luminance loss in the corners of the image due to an imperfect lens system.

Defect correction The defect correction algorithm can detect and correct any defective pixels in a

sensor array.

Noise reduction filter The noise reduction filter is based on an adaptive algorithm. This algorithm

performs filtering but does not affect image areas including significant information.

Color interpolation Each pixel RGB components are calculated by interpolation of the incoming

Bayer pattern.

Figure 2: Video processing unit

To video processing unit

Input

FPN

Color interpolation

Color matrix

Gamma

Scaler

Sharpness

enhancement

Anti-vignetting

Defect

correction

Noise

reduction

Statistics

gathering

Microprocessor

control unit

and

video compression unit

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