Video quality assessment method under condition of comprehensively considering compression and packet loss impairment
A technology of video quality and evaluation method, applied in digital video signal modification, television, electrical components, etc., can solve problems such as video packet loss and quality, and achieve the effect of reducing computational complexity and improving quality
Inactive Publication Date: 2011-05-25
COMMUNICATION UNIVERSITY OF CHINA
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The impact of each video packet loss on quality under the premise of compression coding damage is a problem worth studying.
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[0043] A specific implementation of the method for evaluating video quality under the condition of combining compression and packet loss damage in the present invention includes the following steps:
[0044] A. Expression of GLM model:
[0045] We use the generalized linear model (GLM) to predict the video quality score, which is expressed in equation (1):
[0046] (1)
[0047] In the formula, y is the quality score we want to predict, specifically the absolute value or difference of VQM. γ is a constant term, x j Is the feature factor, that is, the feature parameter that reflects the video quality, and N represents the number of feature factors. β j Is the coefficient value of each factor, γ and β j (J=1...N) That is to use the obtained quality score and the corresponding characteristic factor value to estimate the predicted item;
[0048] 1 B. Obtaining quality scores:
[0049] The VQM model is a full-reference objective video quality evaluation software standardized i...
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The invention discloses a video quality assessment method under a condition of comprehensively considering compression and packet loss impairment. The method comprises the following steps: GLM (general linear model) model expression, mass fraction acquisition, characterization factor selection and final model establishment. The video quality assessment method under the condition of comprehensively considering compression and packet loss impairment is characterized in by considering comprehensively the quality impairment brought by the video compression and transmission packet loss, and modeling and predicting the influence on the video quality by each video packet loss existing under the compression and impairment condition; modeling based on a fraction obtained on the based of objective evaluation model VQM (vendor quality management), wherein the modeling process is different from the previous algorithm based on the subjective assessment, so manpower participation is not required; achieving a model oriented to a network terminal, i.e., pixel domain information is not required, just a partial decoding mode is adopted, thus the complexity of computation is reduced maximally; and realizing intelligent packet loss by utilizing the model when packet loss is required under the condition of congestion in the video network transmission process, thus method provided by the invention has the advantage of improving the quality of decoding videos on the premises of reducing the same bit rate.
Description
technical field [0001] The invention relates to a video quality evaluation method, in particular to a video quality evaluation method under the condition of joint consideration of compression and packet loss damage. Background technique [0002] At present, with the wide application of compressed video, people pay more and more attention to the problem of video quality evaluation. Aiming at the objective evaluation methods of the damage caused by compression coding to video quality, there are currently many models published, such as the structural similarity method SSIM, the just variation JND method, and the Perceptual Distortion Metric (Perceptual Distortion Metric) method. For video transmitted over the network, in addition to the damage caused by compression, the loss of video packets may have a serious impact on video quality, so video quality evaluation under packet loss conditions is also very important. S. Kanumuri, T.-L. Lin, etc. proposed video quality evaluation ...
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IPC IPC(8): H04N17/00H04N7/26H04N19/124H04N19/176
Inventor 王玉霞姜秀华吕锐
Owner COMMUNICATION UNIVERSITY OF CHINA