STV3550 datasheet(53/144 Pages) STMICROELECTRONICS

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STV3550

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4.4

Picture Compositor

The Picture Compositor is used to mix the video plane improved by the Picture Structure

Improvement (YSI/CTI) module in the Video Display pipeline, with the graphics plane from the OSD

pipeline. The Picture Compositor also includes a cursor plane and background color plane. A 256-

level Transparency mode can be used for mixing the various planes. The following figure shows a

typical configuration of the video/graphics datastream flow through the Picture Compositor.

Figure 38: Typical Configuration of Picture Compositor

Figure 39: Picture Compositor Block Diagram

2H 4:4:4 Video

RGB Out

ClkReset

VTG

Video Output Encoding

STBus

Picture Compositor

Mixer

Background

Color

OSD Pipeline

4:2:2

Video Display

Pipeline

OSD

Interface

Cursor

Module

Video Plug

YCrCb to RGB

Digital to Analog

A1/8

ARGB4444

Background Color

RGB 8:8:8

Video Display Pipeline (Main)

YCbCr 4:4:4

128x128

Cursor Plane

ACLUT8

CLUT

Output (TV)

RGB 4:4:4

YCbCr 4:4:4

to RGB 4:4:4

3*10-bit

Window

Generator

OSD_ACT

nA1/8

nAlpha8

OSD Pipeline

RGB 10:10:10

3*10-bit

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