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Video quality measurement considering multiple artifacts

A quality measurement and effect technology, applied in the direction of digital video signal modification, TV, electrical components, etc., can solve the problem of not getting frames

Inactive Publication Date: 2014-07-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when there is network latency, a frame may not be available at the scheduled display time (i.e. buffer underflow), and the display is paused until a frame becomes available

Method used

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  • Video quality measurement considering multiple artifacts
  • Video quality measurement considering multiple artifacts
  • Video quality measurement considering multiple artifacts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] When multiple types of visual artifacts are present in a video, the artifact strength, ie, artifact level or distortion level, for an individual type of artifact can be measured by various methods.

[0012] Artifact strength can be graded by an objective viewing test that is generally optimal but time consuming. In the present application, the artifact strength or distortion level that is artificially graded (eg, by an objective viewing test) is expressed as a perceived distortion level or an objective distortion level.

[0013] The artifact strength can also be estimated by various algorithms aimed at predicting the perceived level of distortion. For example, existing artifact detection methods for measuring blocking, ringing, blurring and freezing artifacts can be used to provide the distortion level. In this application, a distortion level estimated by an algorithm is expressed as a distortion level, an estimated distortion level, or an objective distortion level. ...

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Abstract

A particular implementation determines objective distortion levels (d,) respectively for a plurality of artifact types. The objective distortion levels are aligned to ensure that the same distortion level of different types of artifacts corresponds to the same perceived distortion level. The aligned distortion levels (d,') are sorted to obtain sorted distortion levels (d,"). The sorted distortion levels are then pooled together into an overall distortion level or an overall quality metric. The sorted distortion levels may be pooled using a weighted sum, wherein the weight is larger when the sorted distortion level is greater.

Description

technical field [0001] The present invention relates to video quality measurement, and more particularly to a method and apparatus for determining an overall video quality metric in response to various artifacts. Background technique [0002] Video quality losses can be caused by various events, eg, by lossy compression and transmission errors, and they can be perceived by the human eye as various types of visual artifacts. For example, blocking, ringing, and blurring are typical artifacts caused by lossy compression. [0003] On the other hand, when transmission errors degrade the video quality, different types of artifacts can be perceived. For example, when packet loss is detected at the transport layer, the decoder can apply error concealment in order to reduce the intensity of visible artifacts. Artifacts can still be perceived after error concealment, and we denote the remaining artifacts as channel artifacts. In another example, when a reference frame is missing in...

Claims

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Application Information

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IPC IPC(8): H04N19/154H04N19/192H04N19/103
CPCH04N19/192H04N17/004H04N19/103H04N19/154H04N19/48H04N19/89
Inventor 顾晓东刘德兵陈志波
Owner THOMSON LICENSING SA