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Spatial scalable compression

A technology that implements space and pixels, applied in the direction of television, electrical components, digital video signal modification, etc., can solve problems such as high bit rate of enhancement layer

Inactive Publication Date: 2005-09-07
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although these layered compression schemes can be made to work well, they still have the problem that the enhancement layers require high bitrates

Method used

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  • Spatial scalable compression
  • Spatial scalable compression
  • Spatial scalable compression

Examples

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Embodiment Construction

[0017] figure 2 is a block diagram of a layered video encoder / decoder 200 according to one embodiment of the present invention. The encoder / decoder 200 includes an encoding section 201 and a decoding section. A high-resolution video stream 202 is input into the encoding section 201 . The video stream 202 is then split by a decomposer 204 , whereby the video stream is sent to a low pass filter 206 and a second decomposer 211 . The low pass filter or downsampling unit 206 reduces the resolution of the video stream before feeding the video stream to a base encoder 208 . The base encoder 208 encodes the downsampled video stream in a known manner and outputs a base stream 209 . In this embodiment, the base encoder 208 up-convert unit 210 outputs the local decoder output. The up-conversion unit 210 reconstructs the filtered resolution from the partially decoded video stream and provides, in known manner, the reconstructed video stream in substantially the same resolution format...

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Abstract

A method and apparatus for providing spatial scalable compression of a video stream is disclosed. The video stream is downsampled to reduce the resolution of the video stream. The downsampled video stream is encoded to produce a base stream. The base stream is decoded and upconverted to produce a reconstructed video stream. The reconstructed video stream is subtracted from the video stream to produce a residual stream. It is then determined which segments or pixels in each frame have a predetermined chance of having a predetermined characteristic. A gain value for the content of each segment or pixel is calculated, wherein the gain for pixels which have the predetermined chance of having the predetermined characteristic is biased toward 1 and the gain for other pixels is biased toward 0. The residual stream is multiplied by the gain values so as to remove bits from the residual stream which do not correspond to the predetermined characteristic. The resulting residual stream is encoded and outputted as an enhancement stream.

Description

technical field [0001] The present invention relates to video encoder / decoders. Background technique [0002] Due to the very large amount of data inherent in digital video, the transmission of full-motion, high-definition digital video signals is a significant problem in the development of high-definition television. In particular, each digital image frame is a still image formed by an array of pixels according to the display resolution of a particular system. As a result, the amount of raw digital information contained within a high resolution video sequence is enormous. In order to reduce the amount of data that has to be sent, a compression scheme is used to compress the data. Different video compression standards or processes have been established, including MPEG-2, MPEG-4, and H.263. [0003] Many applications have been implemented in which video can be in various resolutions and / or qualities in one stream. The methods to achieve this are loosely referred to as sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30H04N7/26
CPCH04N7/26351H04N19/0026H04N19/00066H04N19/00903H04N19/00436H04N19/117H04N19/17H04N19/33H04N19/85
Inventor W·H·A·布鲁斯G·J·M·维沃尔特R·B·M·克莱恩冈内维克M·J·R·奥德比克
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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