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System, method, and apparatus for determining presentation time for picture without presentation time stamp

a technology of presentation time and system, applied in the field of system, method, apparatus for determining presentation time for picture without presentation time stamp, can solve problems such as particular complexity

Active Publication Date: 2011-03-17
AVAGO TECH INT SALES PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a system, method, and apparatus for determining the presentation time for pictures without a presentation time stamp. This is useful for applications such as video playback where it is important to know when a picture should be shown. The system decodes a first picture and a second picture, with the first picture serving as a reference for the second picture. It then computes the presentation time for the second picture based on the presentation time and the decode time for the first picture. This allows for accurate and efficient playback of videos without the need for additional information.

Problems solved by technology

This can be unfeasible where a large number of consecutive pictures are without time stamps.
This is particular complex in cases where there are a large number of consecutive B-pictures.

Method used

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  • System, method, and apparatus for determining presentation time for picture without presentation time stamp

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Embodiment Construction

[0023]FIG. 1a illustrates a block diagram of an exemplary Moving Picture Experts Group (MPEG) encoding process of video data 101, in accordance with an embodiment of the present invention. The video data 101 comprises a series of pictures 103. Each picture 103 comprises two-dimensional grids of luminance Y, 105, chrominance red Cr, 107, and chrominance blue Cb, 109, pixels.

[0024]FIG. 1b is an illustration of a picture 103. A picture 103 can either be captured as an interlaced picture or as a progressive picture. In an interlaced picture 103, the even-numbered lines are captured during one time interval, while the odd-numbered lines are captured during an adjacent time interval. The even-numbered lines form the top field, while the odd-numbered lines form the bottom field of the interlaced picture.

[0025] Similarly, a display device can display a picture in progressive format or in interlaced format. A progressive display displays the lines of a picture sequentially, while an interl...

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Abstract

Presented herein are system(s), method(s), and apparatus for determining the presentation time for a picture without a presentation time stamp. A first and second picture are decoded. The first picture is a reference picture for the second picture. The presentation time for the second pictures is computed as a function of a presentation time and a decode time for the first picture.

Description

RELATED APPLICATIONS [0001] [Not Applicable]FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] [Not Applicable]MICROFICHE / COPYRIGHT REFERENCE [0003] [Not Applicable]BACKGROUND OF THE INVENTION [0004] In MPEG-2 video, a B-picture can be encoded by one picture displayed before, called the forward reference picture and one picture displayed after, called the backward reference picture. Encoded B-pictures are data dependent on these reference pictures. The reference pictures are decoded prior to the B-picture. One of the reference pictures, however is displayed after the B-picture. [0005] As a result, the decoding order and the displaying order can be different. The decoder system receives the pictures in the decoding order. After decoding the pictures, the decoder system reorders the pictures into the display order. A display engine displays the reordered pictures. [0006] A multimedia program can include a video, multiple audio channels, and data channels. The video, audio channels, an...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/66H04N11/02H04N11/04H04N7/12
CPCH04N21/4307H04N21/43072
Inventor MPR, SRINIVASCHEN, SHERMANBHATIA, SANDEEP
Owner AVAGO TECH INT SALES PTE LTD