A Modified Just Noticeable Depth Difference Model Built in Perceived Depth Space

Abstract

This paper proposes a modified just noticeable depth difference (JNDD) (JNDiD) model in perceived depth space. The JNDiD model improves the accuracy of current JNDD models by also taking into account the blurriness caused by the change in accommodation when a 3-D object is perceived far from the screen. This change in accommodation is a result of the convergence-accommodation conflict, in which convergence plays a leading role. In the JNDiD model described in this paper, the JNDD threshold is the addition between a base threshold and an additional threshold. Adapted to different blurring effects in three depth regions, the additional threshold is defined as a three-piecewise linear function. The proposed model also attempts to separate the JNDD modeling from the display modeling and viewing conditions in perceived depth space, making it applicable for different types of displays given their specific model parameters. With the help of model parameter transfer functions, the JNDiD model in perceived depth space and the corresponding one in any specific stimulated depth space can be easily transformed to each other. Experimental results demonstrate the effectiveness and superiority of the JNDiD model in perceived depth space.