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Screen display mixing system and method

A technology of screen display and hybrid system, applied in the scanning details of TV system, components of TV system, TV and other directions, can solve the problems of large hardware area, cost cannot be reduced, system hardware area cannot be reduced, etc.

Inactive Publication Date: 2007-05-16
SHANGHAI MAGIMA DIGITAL INFORMATION
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the prior art, such a conversion module is provided for the conversion of each layer RGB to YUV format, but the hardware area consumed by the conversion module of RGB to YUV format is relatively large, which will inevitably lead to the inability to reduce the hardware area of ​​the entire system. Correspondingly, Costs cannot be reduced

Method used

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  • Screen display mixing system and method

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Embodiment Construction

[0033] In MPEG-2 decoding, usually, GUI, OSD and subtitles are all stored in SDRAM in a fragmented form. In order to simplify the layered model in the DVB standard, scattered content such as the GUI layer, OSD layer and subtitle layer can be pre-mixed before being sent to the screen display mixing system (hereinafter referred to as the mixing system) to form a full-screen graphics layer and save it back. SDRAM. In one embodiment of the present invention, a 2D engine can be used to perform alpha blending on scattered contents in SDRAM such as GUI layer, OSD layer and subtitle layer in advance to form a full-screen graphics layer. In a preferred implementation manner, the graphics layer may be allowed to support several pixel formats with small bit widths, thereby reducing bandwidth requirements to a certain extent. After pre-mixing, the original mixing model is simplified into 4 layers, as shown in Figure 2, which are background layer 11, graphic layer 17, video layer 12 and c...

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Abstract

The mixed display screen system comprises: a coordinate scanning device to scan screen and generate current scanning pixel as coordinate flow; a first rectangular window device to decide the window contained current scanning pixel and select data to from a RGB domain temporary layer; a second rectangular window device to decide the video widow contained current pixel, a read buffer device to receive data from two rectangular windows, a conversion device to convert the temporary layer data from RGB domain into YUV domain; and an Alpha mixer to mix YUV domain data with video data.

Description

technical field [0001] The invention relates to a screen display mixing system, in particular to a screen display mixing system for mixing multi-layer data such as a video layer and a graphics layer. Background technique [0002] Digital Video Broadcasting (Digital Video Broadcasting; DVB) is a market-oriented digital service architecture. The DVB standard uses MPEG-2 as the encoding and compression method for audio and video. The compressed MPEG-2 code stream is packaged to form a transport stream (TS). After multiplexing multiple transport streams, it can be transmitted through different media such as satellite, cable TV, and open-circuit TV. [0003] Before the MPEG2 code stream is decoded into pictures and sent to the TV signal encoder for encoding and display, it usually needs to be pre-mixed with OSD (on screen display object), cursor, background, Graphic User Interface (GUI), subtitles, etc. , to form a picture together, and then sent to the TV signal encoder to disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/262H04N3/10H04N5/445
Inventor 周振亚袁焱
Owner SHANGHAI MAGIMA DIGITAL INFORMATION
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