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Appts. and method for generating on-screen-display messages using one-bit pixels

A technology of pixels and devices, applied in the field of generating screen display messages, can solve the problems of increasing memory bandwidth requirements and total computing overhead, etc.

Inactive Publication Date: 2003-07-02
THOMSON CONSUMER ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the OSD message must be displayed (overlaid) with video data, the microprocessor of the decoding / display system must allocate a bandwidth portion of the memory to perform the OSD function, thereby increasing the memory bandwidth of the decoding / display system Requires and total computational overhead

Method used

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  • Appts. and method for generating on-screen-display messages using one-bit pixels
  • Appts. and method for generating on-screen-display messages using one-bit pixels
  • Appts. and method for generating on-screen-display messages using one-bit pixels

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Embodiment Construction

[0012] figure 1 A block diagram showing a decoding / display system for the television signal 100 (hereinafter referred to as a decoding system). The decoding system includes a processor 130 , a random access memory (RAM) 140 , a read only memory (ROM) 142 , an OSD unit 150 , a video decoder 160 , and a mixer 170 . The output of mixer 170 is coupled to display device 190 via path 180 .

[0013] The present invention is described below in terms of MPEG standards, ISO / IEC International Standards 11172 (1991) (commonly referred to as the MPEG-1 format) and 13818 (1995) (commonly referred to as the MPEG-2 format). However, those skilled in the art will recognize that the present invention may be applied or used to implement other coding systems implementing other encoding / decoding formats.

[0014] In the preferred embodiment, the decoding system 100 performs real-time audio and video decompression of various data streams (bitstreams) 120 . The bitstream 120 may include audio and...

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Abstract

An apparatus and concomitant method for generating an OSD message by constructing an OSD bitstream having a plurality of "one-bit" pixels. The OSD bitstream contains an OSD header and OSD data. An OSD unit retrieves pixel control information from the OSD header which is programmed by a processor of a decoding / displaying system. The OSDheader contains information that is used to program a color palette of the OSD unit and to provide instructions as to the treatment of the OSD data. If the "Compressed Pixel Mode" is enabled in the OSD header, then the OSD unit will treat each bit of the OSD data as a "one-bit" pixel.

Description

technical field [0001] The present invention relates to methods and apparatus for generating On Screen Display (OSD) messages. More specifically, the present invention relates to reducing the memory bandwidth requirements of a decoding / display system by using one bit of pixel to access a predefined color palette for an OSD area. Background technique [0002] On-screen messages play an important role in consumer electronic products, providing interactive information to users and guiding them to use and configure the product. Other important features of the OSD include the ability to provide closed captioning (Closed Captioning) and channel logos (logos) display. [0003] However, the improvement of digital video technical standards has caused a problem that the total amount of OSD messages to be generated and displayed has increased. For example, a particular High Definition Television (HDTV) specification, HDTV must display up to 216 characters in four windows, compared to...

Claims

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Application Information

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IPC IPC(8): H04N5/445
Inventor M·D·诺克斯A·H·丁维迪
Owner THOMSON CONSUMER ELECTRONICS INC
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