Motion/Pursuit Ratio and Depth in 2D (Visual Depth Perception 18)
The relative error in using instead of the motion/pursuit law is . This Demonstration interactively computes these ratios at time zero, a variable time, and the peak time.
Experimental evidence suggests that people underestimate relative depth for distractors beyond the fixate () and overestimate closeness (or for distractors nearer than the fixate. The motion/pursuit ratio has this relationship to the motion/pursuit depth formula, so it is possible that the ratio alone is a better estimate of the perceived depth.
The dark gray graph on the left is and the transparent colored graph is . On the right, the light gray graph is the relative depth ; the colored graphs are and at the critical time where these quantities peak. For more on peak times see "Motion/Pursuit Law in 2D (Visual Depth Perception 3)" in Related Links.