Study of relative spatial frequency constancy

We investigated the binocular depth perception arising from stereoscopic presentation of two gratings of identical cycles, but at different distance from the observer. The relation between the angle of tilt and diffrequency ratio were probed quantitatively, and the results supported that there may, in fact, be a relative spatial frequency constancy. Analysis of the data indicates a new kind of psychological law following the global stereopsis formula, determines the relative depth of one object.