Computer-aided methods for clinical stereo acuity measurement: Some practical aspects of left-right image separation techniques M Gracheva |
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IITP Russ Acad Sci, Russian Federation
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| Current computer-aided methods for presenting test stereo images imply generation of left and right images on one display and employment of some image separation techniques. Until recently, most investigators used temporal or color separation principles requiring shutter-glasses or color filters. At present, it seems more rational to use the polarization principle. As concerns the techniques based on shutter-glasses, the main deficiencies are often caused by ambient illumination (flickering in the case of gas-discharge lamps) and synchronization device. As concerns color separation technique, its deficiency was revealed but only after testing in parallel with polarization technique. To get comparable data, we used 3D display that makes possible to employ both color and polarization techniques of image separation in similar conditions. Correspondingly, in one series of measurements, left and right images were presented in anaglyphic form; in another series, left and right images were presented on differently polarized rows of pixels. The results obtained in ten subjects with polarization techniques in the range of frequencies 2-8 cpd appeared to be significantly better. This superiority suggests that difference in color between left and right images might exert essential negative effect on detecting threshold disparities. Supported by the Program of DNIT Russ Acad Sci. |
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