Crosstalk is a critical factor determining the image quality of stereoscopic displays. Also known as ghosting or leakage,
high levels of crosstalk can make stereoscopic images hard to fuse and lack fidelity; hence it is important to achieve low
levels of crosstalk in the development of high-quality stereoscopic displays. In the wider academic literature, the terms
crosstalk, ghosting and leakage are often used interchangeably and unfortunately very few publications actually provide
a descriptive or mathematical definition of these terms. Additionally the definitions that are available are sometimes
contradictory. This paper reviews how the terms crosstalk, ghosting and associated terms (system crosstalk, viewer
crosstalk, gray-to-gray crosstalk, leakage, extinction and extinction ratio, and 3D contrast) are defined and used in the
stereoscopic literature. Both descriptive definitions and mathematical definitions are considered.