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Video comfort noise addition technique

A noise, video stream technology, applied in the direction of digital video signal modification, TV, TV system components, etc.

Active Publication Date: 2006-09-20
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding random noise to the decoded stream can reduce the prominence of these compression artifacts, however the large frame-to-frame differences created by adding random noise will themselves produce prominent and obnoxious artifacts

Method used

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Embodiment Construction

[0010] According to the present principle, random noise including a dither signal is added to the already decoded signal in an amount related to the added noise of the pixels in the previous picture for improving the subjective video quality. figure 1 A schematic block diagram of a first decoding device 10 for adding noise after decoding is shown. The decoding means 10 comprise a decoder 12 for decoding an input encoded video stream. The design of the decoder 12 depends on the compression format used to encode the input video stream. In a preferred embodiment, the input video stream is compressed using the well known ITU / ISO H.264 standard. In this case the encoder 12 is in the form of an H.264 encoder as is known in the art. The reference picture memory 14 stores pictures decoded by the decoder 12 to be used by the decoder in decoding future pictures.

[0011] A summation block 18 sums each decoded picture from the decoder 12 with the noise from the noise generator 16 . A...

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Abstract

A decoding arrangement for decoding pictures in an incoming video stream includes a noise generator for adding a dither signal containing random noise to the pictures after video decoding, to improve the subjective video quality. The noise generator adds noise to each pixel in an amount correlated to additive noise of pixels in a prior picture, either a previously displayed picture (i.e., a previously decoded picture to which noise has been added), or a previously decoded picture.

Description

technical field [0001] The present invention relates to a technique for reducing artifacts associated with decoding encoded video streams. Background technique [0002] Decoding of video streams compressed at low bitrates tends to result in visual artifacts that can be noticed by a viewer. Mottled and structured noise patterns are common artifacts that appear when using block-based compression techniques. The human visual system is more sensitive to certain types of artifacts, and as a result, these artifacts appear more prominent and objectionable than others. Adding random noise to the decoded stream can reduce the prominence of these compression artifacts, however the large frame-to-frame differences created by adding random noise will themselves produce prominent and obnoxious artifacts. [0003] The addition of dithering signals can reduce human sensitivity to image artifacts, such as hidden contours and modularity artifacts. One prior art proposes adding random nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N7/2601H04N7/26335H04N7/26888H04N7/26968H04N19/00139H04N19/00012H04N19/00909H04N19/00533H04N19/00945H04N7/26122H04N19/102H04N19/136H04N19/44H04N19/86H04N19/90H04N5/21H04N19/85
Inventor 吉尔·麦克唐纳·布瓦斯克里斯蒂娜·戈米拉杰弗里·艾伦·库珀
Owner INTERDIGITAL CE PATENT HLDG
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