| Objective To investigate the importance of biocular match in stereopsis forming and the relaionshiop between different disparity graphs and a tolerant certain limitatity of element density of random dot, and also to help provide theory fundation for stereopsis forming, stereoacuity testing and stereograph making. Methods 30 subjects with normal stereoscopic vision were choiced(synoptophore and TNO testing<60s). To observe the effect of the changes of the disparity graphs on the tolerante certain limitatity of element density of random dot,three experiments were designed and the disparity graphs were observe by a computerized program designed by ourself which can test middle and far stereoscopic vision. The first was to observe the change of pattern area , The second, the change of pattern form and the third, the change of circumference for static disparity graphs. Result 1. The tolerante certain limitatity of element density of random dot reduced with disparity graphs' area pattern increasing .2(l)If the disparity graphs circumference unchanged, The tolerante certain limitatity of element density of random dot reduced with disparity graphs' area pattern increasing.(2) But if the disparity graphs' area pattern unchanged,the rectangle disparity graphs need more the random-dot than the square's,(3)Whther the disparity graphs pattern is or square, we feel the rectangle disparity graphs need more random dot than square's when keep the disparity graphs' area pattern unchanged only with circumference pattern changed, we find the circumference can affect the vertical disparity graphs a lot more than the level disparity graphs. Conclusion The static random-dot stereogram can be touched only when withenough information,that is to say,the density of random-dot must be above the threshold of element density that we can touch disparity graphs. (2) The result of stereoacuity testing in the static random-dot stereogram may be affect by the texture of the background. |
PDF Full Text Request