Abstract: In the experiment, the stereoscopic depth constancy was explored indistances between1.5--6m. The results showed that all the three objectswhich are different depth were Perceived constantly. In order to calculate the range of their stereoscopic depth constancy, weused Brunswik's formulae BR=(R-S)/(A-S). The range of constancy we found in most observation conditions waswithin 1±10%.

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