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Method of scaling subpicture data, video processing circuit and digital laser video disk broadcasting system

A technology for processing circuits and sub-pictures, which is applied to the components of TV systems, electronic editing of digital analog information signals, data recording, etc., and can solve the problems of sub-picture flickering and user visual inconvenience.

Inactive Publication Date: 2006-11-01
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In short, since the known method of zooming the presentation size of the sub-picture is to perform zooming operations on the upper field data and the lower field data respectively, this will have a negative impact on the quality of the sub-picture after presentation. In addition, using the known adjustment The method will also cause the sub-screen to flicker and cause visual inconvenience to the user

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  • Method of scaling subpicture data, video processing circuit and digital laser video disk broadcasting system
  • Method of scaling subpicture data, video processing circuit and digital laser video disk broadcasting system
  • Method of scaling subpicture data, video processing circuit and digital laser video disk broadcasting system

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Embodiment Construction

[0029] For the DVD system, a sub-picture unit represents a sub-picture image to be displayed on the screen, and the sub-picture unit includes a sub-picture unit header, pixel data and a display command sequence table (DCSQT) . The sub-picture unit header provides information about the size of the sub-picture unit and the start address of the display instruction serial table. The pixel data will be divided into a top field and a bottom field, where both the top field and the bottom field contain multiple pixel values ​​represented by 2 bits, which are used to define the subfield How to display the pixels in the screen. For example, a pixel may be defined as a background pixel (background pixel) with a pixel value of "00", or as a pattern pixel (pattern pixel) with a pixel value of "01". A pixel value of "10" is defined as a first emphasis pixel, and a pixel value of "11" is defined as a second emphasis pixel. Before storing or transmitting the pixel data, the pixel data is ge...

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Abstract

A method for scaling subpicture data comprises receiving a video data stream and a subpicture data stream; pre-parsing the subpicture data stream to obtain line information of subpicture data, the subpicture data containing both top field pixel data and bottom field pixel data; calculating the number of lines contained in the top field pixel data and the bottom field pixel data from the pre-parsed line information; interlacing the top field pixel data and the bottom field pixel data; scaling the top and bottom field pixel data together in interlaced form for adjusting the number of lines contained in the top field pixel data and the bottom field pixel data; separating the scaled pixel data into updated top field pixel data and updated bottom field pixel data; and separately storing the updated top field pixel data and the updated bottom field pixel data in a memory.

Description

[0001] Video processing circuit and digital laser video disc playback system technical field [0002] The present invention relates to the processing of digital video signals, especially a method for adjusting the presentation ratio of DVD sub-picture data and related devices. Background technique [0003] In conventional display technologies, methods for displaying TV / video source data on displays with different resolutions are well known to those skilled in the art. For example, video signals such as TV broadcast signals, cable TV signals, satellite TV signals, VCR signals, and DVD signals (please note here that DVD can be an abbreviation for digital versatile disc or digital video disc ) can be displayed on a computer monitor or television. In addition, televisions also have different specifications, such as the National Television System Committee (NTSC) specification and the Phase Alternation Line (PAL) specification, wherein the NTSC specification has a resolution of ...

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Application Information

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IPC IPC(8): H04N5/45G09G5/373
CPCG11B27/034G11B27/105G11B2220/2562
Inventor 谢有庆
Owner MEDIATEK INC