VS6724 datasheet(17/118 Pages) STMICROELECTRONICS

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VS6724

Functional description

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2.5.2

Aperture correction

The aperture correction module is used to add a certain amount of sharpening to the scaled

RGB, it can be programmed to reduce as the light level drops. The aperture correction

module also includes a function known as coring which allows control of the minimum

magnitude which any edge on the image must exceed before sharpening is applied. This

ensures that small edges such as noise are not amplified by the sharpening. The coring can

be programmed to increase as the light level drops.

2.5.3

Special effects

The special effects module is used to apply simple transforms onto the input data. The

supported effects are: Black and White, Hue, Sepia, Negative, Antique, sketch, caricature

and Emboss. There are also a number of color effects which can only be applied to YCbCr

data.

2.5.4

Gamma correction

The gamma module is a gain curve applied to each of the three image components from the

sharpening module. The shape of the gain curve is fully programmable.

2.5.5

YCbCr conversion

This module performs color space conversion from RGB to YCbCr. It is used to control the

contrast and color saturation of the output image as well as the fade to black feature.

2.5.6

Dither

The dither block is used in RGB modes to reduce contouring in the image when the data is

truncated to lower ranges. This is achieved by determining the error introduced by truncation

and adding/subtracting this residual energy to/from the subsequent pixel.

2.6

Video compression module

The JPEG encoder receives YCbCr data from the image reconstruction engine and

encodes it using baseline sequential JPEG technique. It outputs a standard JPEG data

stream with all the required markers and segments required by decoders.

2.6.1

Features

●

Supports YCbCr 422 as input data format.

●

Converts YCbCr 422 to 420 format internally, format selectable.

●

Baseline ISO/ IEC 10918-1 JPEG compliance.

●

Programmable quantization tables.

●

Capable of streaming the UXGA image at a rate of 30 frames per second.

●

Manual / automatic compression control via scaled quantization tables.

●

Automatic compression control targeted at file size and/or peak bit-rate.

●

Progressive high-frequency roll-off option for increased compression.

●

Intraframe rate-control via zig-zag sequence truncation.

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