STV3550 datasheet(59/144 Pages) STMICROELECTRONICS

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STV3550

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5.2

Gamma Correction

The Gamma correction is a completely programmable block, which is used to correct the input

pixels. The CPU supplies the gamma correction curves by writing the data into the Look Up Tables

located in this block. This block can be bypassed, in which case the flow of pixels is left unchanged.

5.3

Perfect Color Engine

PCE (Perfect Color Engine) dithers an input 10 bit video stream down to 4-6-8-10 output bits.The

dithering is done in space and time in such a way that the eye does not perceive objectionable

artifacts such as:

●

Fixed dither patterns

●

Contours

●

Flickering pixels

●

Phase correlated flickering, which creates wave patterns known as swimming.

Note:

The dithering efffect tends to average neighboring pixels and smooth the color tonal transition and

contours of the image. It works by spreading the quantization error over neighboring pixels (spatially

and temporally).

5.4

Digital Video Output Stage

5.4.1

Introduction

This block performs the digital video output stage. This block generates the Data Enable (DE) signal

on account of the register configuration, it also resynchronises and recalibrates the Vsync and

Hsync signals according to the register configuration. This block delivers the Data Clock (Dclk) with

a delay selected by the register and fixes the default output state of all the digital video interface.

This block also provide a reduce interface with a data valid on each edge of the clock.

The output frequency range is 22MHz up to 72MHz according to the user configuration.

Figure 42: Gamma Correction Block Diagram

Blue LUT

Green LUT

Pixel

outputs

Red LUT

STBus

Interface

(STI)

Pixel Inputs

Translation (TRA)

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