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Distortion weighing

A technology of weight and activity, applied in the direction of TV, electrical components, pulse modulation TV signal transmission, etc., can solve multi-bit problems

Inactive Publication Date: 2012-04-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lowering the QP of these macroblocks may cost very many bits, thus adding too many bits for practical use

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiments generally relate to the processing of pixel blocks of a frame, wherein characteristics of pixels within the pixel block are allowed to reflect and affect the distorted representation of the pixel block. As a result, embodiments provide efficient techniques for processing pixel blocks comprising smooth pixel portions with small variations in pixel properties or values, and relatively high activity with respect to higher changes in pixel properties. the pixel portion of the .

[0043]The novel distortion representation of the embodiments provides, for example, during encoding and decoding of blocks of pixels and frames, by selecting appropriate encoding or decoding modes, performing motion estimation and reducing the number of encoding or decoding modes investigated during encoding and decoding. a valuable tool.

[0044] In order to simplify the understanding of the embodiment, first refer to figure 2 A description of the general embodiment follows. The fi...

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Abstract

A distortion representation is estimated for a macroblock (10) of a frame (1) by determining for each subgroup (30) of at least one pixel (20) out of multiple subgroups (30) in the macroblock (10), an activity value representative of a distribution of pixel values in a neighborhood (40) comprising multiple pixels (20) and encompassing the subgroup (30).Respective distortion weights are determined for the subgroups based on the activity values. These distortion weights are employed in order to estimate the distortion representation as a weighted combination of the pixel values of the macroblock (10) and reference pixel values for the macroblock (10). The distortion weights implythat different portions of a macroblock (10) will contribute more or less to the distortion representation as compared to other portions of the macroblock (10). The distortion representation will reduceringing artifacts between high and low activity areas in a frame (1) during encoding.

Description

technical field [0001] The present invention relates generally to distortion weighting of pixel blocks, and more particularly to such distortion weighting that may be used in conjunction with pixel block encoding. Background technique [0002] Video coding standards define syntax for coded representations of video data. Only the bitstream syntax for decoding is specified, which leaves flexibility in designing encoders. Video coding standards also take into account the trade-off between optimizing image quality and reducing bit rate. [0003] Quantization parameters can be used to modulate the step size of a quantizer or a data compressor in an encoder. In general, the quality and bit rate of encoded video depends on the specific values ​​of the quantization parameters used by the encoder. Thus, coarser quantization uses fewer bits to encode a video scene, but also reduces image quality. Finer quantization uses more bits to encode a video scene, but typically increases pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N19/00781H04N19/00151H04N19/00278H04N7/50H04N19/00157H04N7/26244H04N19/00066H04N7/26058H04N7/26127H04N19/00024H04N7/26138H04N7/26037H04N19/00036H04N7/26015H04N19/105H04N19/109H04N19/117H04N19/139H04N19/14H04N19/176H04N19/61H04N19/51
Inventor 理查德·肖伯格肯尼思·安德森程晓音
Owner TELEFON AB LM ERICSSON (PUBL)