Elsevier

Vision Research

Volume 42, Issue 22, October 2002, Pages 2479-2484
Vision Research

Rapid communication
Binocular information about time to collision and time to passage

https://doi.org/10.1016/S0042-6989(02)00086-XGet rights and content
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Abstract

It is well known that, when an object’s horizontal relative disparity is changing appropriately, most observers report a compelling impression that the object is approaching and will collide with the observers at some future instant. Here I derive a new equation, namely TTC approximates (dδ/dt)/(d2δ/dt2). This equation relates TTC to retinal image variables without involving a knowledge of the approaching object’s distance or speed. In this respect the new equation is the binocular equivalent of the well-known equation for tau.

Keywords

Binocular vision
Motion
Time to collision
Binocular disparity

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