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Video streaming

A streaming and video source technology, applied in the field of video streaming, can solve problems such as image quality degradation

Inactive Publication Date: 2011-01-19
BRITISH TELECOMM PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting image degradation is especially noticeable in football content

Method used

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Experimental program
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Embodiment Construction

[0023] figure 1 A video encoder is shown. A video signal (usually in digital form) is received at input 1. The subtractor 2 forms the difference between the input signal and the predicted signal from the predictor buffer 3, which is then further encoded. For example, encoding performed here may include transform encoding4, thresholding (suppressing the transmission of zero or minimal differences), quantization5 and / or variable length encoding6. The input to the predictor memory 3 is the sum of the predicted signal and the encoded difference signal decoded at 8, 9 (so that information loss in the encoding and decoding process is included in the predictor loop), this sum is formed at the adder 7 . Inverse quantizer 8, inverse transform 9, adder 7, memory 3 and motion compensation 10 constitute a local decoder.

[0024] Buffering may be provided at the encoder output 12 and decoder input (not shown) to allow transmission over a constant bit rate channel. A motion estimator 1...

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Abstract

From video source material, one generates a first coded signal using a combination of inter-frame and intra-frame coding, in which intra-coded pictures are forced to occur at least once in each of successive first set time periods. A second coded version of the same source has intra-coded pictures occurring wholly or mainly at times determined by recognition of scene changes in the video source material. In response to a command for streaming, or resumption of streaming, of said video source material, (perhaps following trick-play), firstly the first coded signal is streamed, commencing with an intra-coded picture. Then, at a point coinciding with an intra-coded picture of the second coded signal, one ceases streaming of the first coded signal and instead streams the second coded signal, commencing with that intra-coded picture.

Description

technical field [0001] The present invention relates to video streaming. Background technique [0002] Video compression techniques developed over the past 20 years are based on motion-compensated transform coding. The basic idea is to encode an image and use it as a prediction for the next image. The temporal redundancy is removed by subtracting the predicted image from the source picture, thus obtaining the residual predicted by the block-based transform coding technique. [0003] A source picture is usually divided into 16×16 regions called macroblocks. The encoder searches one or more previously encoded and stored pictures for a better match or prediction for the current macroblock. The displacement between the macroblock co-located with the current macroblock in the reference picture and the pixel area used to predict the current macroblock is called a motion vector. [0004] An alternative to coding a macroblock using prediction from a previous picture (known as an...

Claims

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Application Information

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IPC IPC(8): H04N7/24
CPCH04N21/23439H04N21/6587H04N21/6377H04N19/00163H04N19/00054H04N7/26143H04N19/00266H04N19/0003H04N7/26271H04N21/658H04N5/783H04N19/172H04N19/107H04N19/114H04N19/142
Inventor 帕特里克·约瑟夫·马尔罗伊
Owner BRITISH TELECOMM PLC