Data rate conversion method and apparatus

A rate, data frame technology, applied in the field of data rate conversion, can solve problems such as high field rate

Inactive Publication Date: 2003-01-15
COASES INVESTMENTS BROS L L C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another additional complication in NTSC TV production is that the actual field rate is not 60Hz, but 60000 / 1001Hz
Therefore, regular alternating 2 / 3 pulldowns produce field rates that are actually too high

Method used

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  • Data rate conversion method and apparatus
  • Data rate conversion method and apparatus
  • Data rate conversion method and apparatus

Examples

Experimental program
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Embodiment Construction

[0019] Breshenham's line drawing algorithm is a method of giving arbitrary slope lines on the display device, which are divided into a series of rectangular pixels (Pel). A description of Breshenham's algorithm can be found between pages 433 and 436 of the book "Basics of Interactive Computer Graphics" by Foley et al., published by Addison-Wesley.

[0020] In the line drawing situation shown in Figure 1 (these lines have a rate between 0 and 1), by determining which pixel on the Y axis is closest to the ideal line for each coordinate on the X axis, the algorithm approximates the ideal line. line. This pixel is illuminated or colored as a suitable part of the application.

[0021] When the algorithm moves from left to right in the figure, for example from (n-1) to (n), it determines whether to select pixels with the same Y coordinate for (n-1), or whether to increment the Y coordinate. In the figure, the Y coordinate is incremented at (n) and (n+1), but not at (n+1).

[0022] When ...

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Abstract

A method for converting frame data at a slower rate into field data at a faster rate in a video decoder comprises determining a basic field repetition rate such that a field is repeated an integer number of times in a frame period, calculating a ratio differential of the repetition rate by subtracting from the speed-up ratio of the faster to the slower rate, the ratio of the fields per frame period to the slower rate, comparing the ratio differential with the differential of the field repetition rate and adding or subtracting extra fields when the two are substantially at variance.

Description

Technical field [0001] The present invention relates to a data rate conversion method and device, and particularly, but not exclusively, to video data / frame field rate changing. Background technique [0002] There are many ways to compress video information. In particular, there are three standards that can perform compression: JPEG, MPEG and H.261. These standards are discussed in documents such as US 5212742. [0003] Video information is usually formatted as a series of fields. The original information to be converted to display in a video format is not directly compatible with the field rate at which the information will be displayed. For example, a motion picture film is shot at a rate of 24 frames per second (24 Hz), while the field rate of, for example, the NTSC television system is about 60 Hz. The technique of increasing the frame rate of a movie image to match the movie rate of a television system is called pulldown conversion. [0004] Continu...

Claims

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Application Information

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IPC IPC(8): H04N5/253H04N7/01H04N7/26H04N7/46H04N7/50
CPCH04N19/00781H04N7/01H04N19/00751H04N7/50H04N19/00472H04N7/26941H04N7/467H04N19/61H04N19/587H04N19/40H04N5/253
Inventor阿德里安·P·怀斯
OwnerCOASES INVESTMENTS BROS L L C