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Non-instructive video quality measurement

A quality measurement and video signal technology, applied in the direction of digital video signal modification, TV, electrical components, etc., can solve the problems of video quality deterioration and inconvenient methods

Active Publication Date: 2009-01-28
BRITISH TELECOMM PLC
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  • Abstract
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AI Technical Summary

Problems solved by technology

While the degradation of video quality as a result of the encoding / decoding and delivery process can be obtained by referencing the original sequence, this method is often inconvenient

Method used

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  • Non-instructive video quality measurement
  • Non-instructive video quality measurement
  • Non-instructive video quality measurement

Examples

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Embodiment Construction

[0015] The following embodiments relate to a no-reference, decoder-based video quality assessment tool. The algorithm for this tool runs inside the video decoder, using the quantizer step size parameter (usually a variable contained in the input encoded video stream) for each decoded macroblock and the pixel intensities from each decoded picture Value (pixel intensity value) to estimate the subjective quality of the decoded video. A sliding window mean pixel intensity difference (pixel contrast measure) computation is performed on the decoded pixels of each frame, and the resulting average (TCF) is used as a measure of the noise masking properties of the video. Quality estimation is then made according to a weighting function of the TFC parameter and the average step size parameter. The weighting function is predetermined by performing multiple regression analysis on a training database of feature decoding sequences and previously obtained subjective scores for that sequence....

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Abstract

This invention is concerned with a video quality measurement method, in particular where the video signal having: an original form; encoded form in which video signal has been encoded using a compression algorithm utilising a variable quantiser step size such that the encoded signal includes a quantiser step size parameter; and, a decoded form in which the encoded video signal has been at least in part reconverted to the original form. The method comprises the steps of: a) generating a first quality measure which is a function of said quantiser step size parameter; b) generating a second quality measure which is a function of the spatial complexity of the frames represented by the video signal in the decoded form; and, c) combining the first and second measures.

Description

technical field [0001] The present invention relates to video quality measures, in particular to video quality measures in situations where a video signal has been encoded using a compression algorithm. Background technique [0002] When sending a video signal from one location to another, it is known to encode or compress the signal using an encoding algorithm so that the encoded signal can be sent using a narrower bandwidth than would be required without encoding. When received, the encoded signal is decoded to extract the original signal. A two-dimensional cosine transform is performed in many coding techniques, resulting in a series of transform coefficients whose magnitudes are quantized. Therefore, the bandwidth can be effectively allocated, and the granularity of quantization, that is, the step size, can be changed. [0003] The process of encoding and decoding video sequences can introduce distortion or otherwise degrade signal quality. One method of measuring the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/50H04N7/26H04N17/02
CPCH04N19/00781H04N17/004H04N19/00533H04N19/002H04N19/0009H04N19/61H04N19/124H04N19/154H04N19/44
Inventor 安德鲁·戈登·戴维斯
Owner BRITISH TELECOMM PLC
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