Objective assessment method for stereoscopic video quality based on wavelet transform
a wavelet transform and objective assessment technology, applied in the field of stereoscopic video quality assessment, can solve the problems of inability to introduce different degrees and kinds of distortion, poor accuracy, unreasonable weighting between the left and the right viewpoint, etc., and achieve the effect of increasing the correlation between the objective assessment result and the subjective perception
Active Publication Date: 2016-10-13
NINGBO UNIV
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Benefits of technology
[0006]An object of the present invention is to provide an objective assessment method for a stereoscopic video quality based on a wavelet transform, the method being able to effectively increase a correlation between an objective assessment result and a subjective perception.
[0035]Compared with the conventional technology, the present invention has following advantages.
[0036]Firstly, the present invention fuses the brightness value of the pixels in the left viewpoint image with the brightness value of the pixels in the right viewpoint image in the stereoscopic image in a manner of binocular brightness information fusion, and obtains the binocular fusion brightness image of the stereoscopic image. The manner of binocular brightness information fusion overcomes a difficulty in assessing a stereoscopic perception quality of the stereoscopic video quality assessment to some extent and effectively increases an accuracy of the stereoscopic video objective quality assessment.
[0037]Secondly, the present invention applies the three-dimensional wavelet transform in the stereoscopic video quality assessment. Each frame group in the binocular fusion brightness image video is processed with the one-level three-dimensional wavelet transform, and video time-domain information is described through a wavelet domain decomposition, which solves a difficulty in describing the video time-domain information to some extent and effectively increases the accuracy of the stereoscopic video objective quality assessment.
Problems solved by technology
However, during the process of capturing, compression, coding, transmission, and displaying of the stereoscopic video, it is inevitable to introduce different degrees and kinds of distortion due to a series of uncontrollable factors.
Conventionally, most of the objective assessment methods for the stereoscopic video quality merely simply apply the plane video quality assessment method respectively for assessing the left viewpoint quality and the right viewpoint quality; such objective assessment methods fail to well deal with the relationship between the viewpoints nor consider the influence of the depth perception in the stereoscopic video on the stereoscopic video quality, resulting in the poor accuracy.
Although some of the conventional methods consider the relationship between the two eyes, the weighting between the left viewpoint and the right viewpoint is unreasonable and fails to accurately describe the perception characteristics of the human eyes to the stereoscopic video.
Thus, the conventional objective assessment methods for the stereoscopic video quality fail to accurately reflect the perception characteristics of the human eyes, and have the inaccurate objective assessment results.
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[0041]The present invention is further described with an accompanying drawing and a preferred embodiment of the present invention.
[0042]According to a preferred embodiment of the present invention, the present invention provides an objective assessment method for a stereoscopic video quality based on a wavelet transform, wherein an implementation block diagram thereof is showed in the FIGURE, comprising steps of:
[0043]① representing an original undistorted stereoscopic video by Vorg, and representing a distorted stereoscopic video to-be-assessed by Vdis;
[0044]② calculating a binocular fusion brightness of each pixel in each frame of a stereoscopic image of the Vorg; denoting the binocular fusion brightness of a first pixel having coordinates of (u,v) in an fth frame of the stereoscopic image of the Vorg as Borgf(u,v),
Borgf(u,v)=(IorgR,f(u,v))2+(IorgL,f(u,v))2+2(IorgR,f(u,v)×IorgL,f(u,v)×cos∂)×λ;
then according to the respective binocular fusion brightnesses of all the pixels in each ...
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An objective assessment method for a stereoscopic video quality based on a wavelet transform fuses brightness values of pixels in a left viewpoint image and a right viewpoint image of a stereoscopic image in a manner of binocular brightness information fusion, and obtains a binocular fusion brightness image of the stereoscopic image. The manner of binocular brightness information fusion overcomes a difficulty in assessing a stereoscopic perception quality of a stereoscopic video quality assessment to some extent and effectively increases an accuracy of a stereoscopic video objective quality assessment. When weighing qualities of each frame group in a binocular fusion brightness image video corresponding to a distorted stereoscopic video, the objective assessment method fully considers a sensitivity degree of a human eye visual characteristic to various types of information in the video, and determines a weight of each frame group based on a motion intensity and a brightness difference.
Description
CROSS REFERENCE OF RELATED APPLICATION[0001]The present application claims priority under 35 U.S.C. 119(a-d) to CN 201510164528.7, filed Apr. 8, 2015.BACKGROUND OF THE PRESENT INVENTION[0002]1. Field of Invention[0003]The present invention relates to a stereoscopic video quality assessment method, and more particularly to an objective assessment method for a stereoscopic video quality based on a wavelet transform.[0004]2. Description of Related Arts[0005]With the rapid development of the video coding technology and displaying technology, various types of video systems have been increasingly widely applied and gained attention, and gradually become the research focus in the information processing field. Because of the excellent watching experience, the stereoscopic video has become more and more popular, and the applications of the related technologies have greatly integrated into the current social life, such as the stereoscopic television, the stereoscopic film and the naked-eye 3D...
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IPC IPC(8): G06T7/00G06T7/20H04N13/00
CPCG06T7/0002H04N13/0007G06T2207/10028H04N2013/0085H04N2013/0081G06T7/206G06T2207/10021G06T2207/20064G06T2207/30168H04N19/597H04N13/161H04N13/106
Inventor JIANG, GANGYISONG, YANGPENG, ZONGJUCHEN, FENZHENG, KAIHUILIU, SHANSHAN
Owner NINGBO UNIV