9 research outputs found
Quality index for stereoscopic images by jointly evaluating cyclopean amplitude and cyclopean phase
With widespread applications of three-dimensional (3-D) technology, measuring quality of experience for 3-D multimedia content plays an increasingly important role. In this paper, we propose a full reference stereo image quality assessment (SIQA) framework which focuses on the innovation of binocular visual properties and applications of low-level features. On one hand, based on the fact that human visual system understands an image mainly according to its low-level features, local phase and local amplitude extracted from phase congruency measurement are employed as primary features. Considering the less prominent performance of amplitude in IQA, visual saliency is applied into the modification on amplitude. On the other hand, by fully considering binocular rivalry phenomena, we create the cyclopean amplitude map and cyclopean phase map. With this method, both image features and binocular visual properties are mutually combined with each other. Meanwhile, a novel binocular modulation function in spatial domain is also adopted into the overall quality prediction of amplitude and phase. Extensive experiments demonstrate that the proposed framework achieves higher consistency with subjective tests than relevant SIQA metrics
Quality Index for Stereoscopic Images by Separately Evaluating Adding and Subtracting
<p>Summation and difference of stereo pair (a) Left view, (b) Right view, (c) binocular difference map and (d) binocular summation map.</p
Performance comparison of each part and overall.
<p>Performance comparison of each part and overall.</p
10 statistic results of 18 distorted pairs of an original pair.
<p>10 statistic results of 18 distorted pairs of an original pair.</p
Weighting matrix <i>w</i> used in contrast masking.
<p>Weighting matrix <i>w</i> used in contrast masking.</p
Subbands indexing of DWT.
<p>Each subband is indexed by a level λ and an orientation <i>θ</i>. <i>θ</i> = 2, 3, 4 denote the vertical, horizontal, and diagonal subbands, respectively.</p
Decoupling Result of Test Binocular Summation.
<p>Decoupling Result of Test Binocular Summation.</p