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Abstract
Existing perceptual researches on stereoscopic image mainly focus on proving the effectiveness of binocular suppression theory in reducing bandwidth during asymmetrical coding. However, they care little about the threshold below which the phenomena exist. To determine the threshold as visible in the asymmetrical stereoscopic image coding, the relationship between visibility threshold and coding parameter or objective quality under practical viewing conditions is investigated in this paper. Perceptual experiments are designed by using the paired comparison methods. Experimental results show that the visible threshold is dependent on stereoscopic image content, coding parameter and objective quality of the left (dominant) view in asymmetrical stereoscopic image coding. Furthermore, we model the visible threshold as a linear function of the quantisation parameter of the left (dominant) view for asymmetrical coding. Then based on the model, we build a looking-up table for practical coding. The concise linear model can serve as an upper bound for controlling perceived quality of asymmetrical coding.
This work is supported by the Natural Science Foundation of China (grant nos. 60872094, 60902096 and 61071120), the Specialized Research Fund for the Doctoral Program of Higher Education of China (grant nos. 20093305120002 and 200816460003) and the Graduate Innovation Research Project of Zhejiang Province, China (YK2009044). It is also sponsored by K. C. Wong Magna Fund in Ningbo University and the Scientific Research Foundation of Graduate School of Ningbo University.