2/18/2023 0 Comments Random dot stereogram![]() The disparity was 8 arc min which was the most sensitive to human visual system in uncrossed disparity. The parallax effect zone was a square or a square loop. The densities of the RDS were 10%, 20%, 30% and 40%, the size of dot was 2pix*2pix, seen in Fig. experimental protocol was approved by the Ethics Committee of Changchun University of Science and Technology.Īll stimuli images consisted of red and blue dots on a white background. ![]() They had the stereo acuity of at least 60″ tested by the Digital Stereoscopic Test Charts of Yan Shaoming. All subjects had normal or correct-to-normal visual acuity. Nine healthy subjects (Ages 20-22, average 20.7, 7 males) participated in the study. So it is important to study how the density and the size of dots in random-dot stereograms influence stereopsis cognition. And it is not clear how the density of the RDS and the size of dots in RDS affect the stereopsis perception. Researchers had investigated the importance of the relationship between different disparity graphs densities and stereopsis forming. And much of the discussion threshold of element density concerned disparity graphs’ area and circumference. However, if the random dots are very less, it could reduce the vision information, then the ability to distinguish 3D graphics are affected. In the random-dot stereograms, the more random dots are, the more false targets need to be eliminated. In this study, the focus was on the influence of the density and the dot size in RDS on stereopsis cognition. Therefore, the characteristics of RDS are very important in the study. So many researchers used RDS in the studies of stereo vision. It was an important invention in the field of human stereo vision because it proved only binocular disparities can produce stereoscopic vision. He believed that the global stereopsis and local stereopsis were two different mechanisms and he made the random-dot stereograms (RDS) which didn’t include monocular clues. In 1962, the American scientist Julesz put forward the concept of global stereopsis. The two similar images which have a little difference in position are fused by our brain to yield the three-dimensional images. The difference in position is called disparity. Because of the 65mm separation between our two eyes, the images in the left eye and in the right eye have a bit difference in position on retina. So it is important to study how the brain achieves 3D images from 2D images formed on the retina of the left and right eyes. When people watched stereoscopic videos or films for a long time, they would feel visual uncomfortable, visual fatigue, headache, nausea etc. When the viewers saw the 3D movies or play the games in VR system, they were very excited. Kingdom, F.A., Simmons, D.R., and Rainville, S.With the development of technology, the 3D products were more popular, especially 3D films and Virtual Reality. This specific impairment of stereoscopic form (as opposed to depth) processing at isoluminance was confirmed in a further experiment in which subjects were required to judge the presence and orientation of depth corrugations in a disparity-modulated random-dot-stereogram. On the other hand contrast thresholds for three-dimensional form judgements were much higher than those for depth judgements in isoluminant, compared to isochromatic random-dot-stereograms. We found that at isoluminance contrast thresholds for depth judgements were not higher for random-dot compared to figural stereograms, even when normalised to the same thresholds obtained with isochromatic stimuli. All contrast thresholds for stereoscopic tasks were normalised to contrast thresholds for detecting the appropriate stimulus. Contrast thresholds for both depth and form discrimination of targets in random-dot- and figural stereograms were measured at a number of disparitics, using both isoluminant and isochromatic stimuli. We have investigated the apparent collapse of stereopsis obtained with random-dot-stereograms at isoluminance.
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