scholarly journals Effects of Color and Luminance Contrast on Size Perception—Evidence from a Horizontal Parallel Lines Illusion

Vision ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 28 ◽  
Author(s):  
Xiaodan Zhang ◽  
Jiehui Qian ◽  
Qiaowei Liang ◽  
Zhengkang Huang
Keyword(s):  
Depth Perception ◽  
Luminance Contrast ◽  
Equal Length ◽  
Size Perception ◽  
Illusory Effect ◽  
Parallel Lines

The present study investigated a size illusion composed of two horizontal lines that were vertically separated and parallel to each other. When the two lines were of equal length, the upper line was consistently perceived to be a little longer than the lower line, therefore it was termed as horizontal parallel lines (HPL) illusion. We investigated the effect of color and luminance contrast on the HPL illusion by manipulating the color and luminance of the two lines. Results indicated the following: (1) differences in color between the two lines reduced the illusion; (2) differences in luminance between the two lines reduced the illusion; (3) Effect 1 was greater than Effect 2; (4) the illusory effect could not be affected as long as both of the lines were of the same color or luminance. The results suggest that the color or luminance contrast may contribute to the overall decrease in the illusory effect for lines with different colors/luminances, but generally the illusion decreases as the two lines are less similar to each other. These findings indicate that the similarity or ‘sameness’ effect dominates the effect of color/luminance contrast on the size illusion over the effect resulted from contrast difference or depth perception.

Depth Perception and Manipulation in Projection-Based Spatial Augmented Reality

2020 ◽  
Vol 27 (2) ◽  
pp. 242-256
Author(s):  
Susanne Schmidt ◽  
Gerd Bruder ◽  
Frank Steinicke
Keyword(s):  
Augmented Reality ◽  
Real World ◽  
Depth Perception ◽  
Research Question ◽  
Luminance Contrast ◽  
Color Temperature ◽  
Future Directions ◽  
Practical Applications ◽  
Spatial Augmented Reality ◽  
World Environment

Spatial augmented reality (SAR) technology allows one to change the appearance of objects by projecting directly onto their surface without the requirement of wearing glasses, and therefore can be used in many practical applications. In this article, we present a human–subject study, which investigates the research question whether it is possible to use SAR to change one's perception of depth and spatial relationships among objects and humans in a real-world environment. Such projected illusions could open up new possibilities, for example, supporting people who suffer from poor depth perception by compensating distance and size misperceptions. We present three monoscopic projection-based techniques that we adapted from visual arts: (i) color temperature, (ii) luminance contrast, and (iii) blur, and show that each of them can significantly change depth perception, even in a real-world environment when displayed with other distance cues. We discuss practical implications and individual differences in the perception of depth between observers, and we outline future directions to influence and improve human depth perception in the real world.

Effects of Brightness Differences on the Panum Phenomenon

1973 ◽  
Vol 36 (3) ◽  
pp. 695-702
Author(s):  
R. J. Pandina ◽  
R. B. Lawson
Keyword(s):  
Depth Perception ◽  
The Other ◽  
Vertical Line ◽  
Stereoscopic Depth ◽  
Spatial Disparity ◽  
Parallel Lines ◽  
Brightness Difference

The Panum phenomenon requires presentation of 2 laterally displaced vertical parallel lines to one eye and a single vertical line to the other eye which gives rise to only 2 lines in the stereoscopic field with one of the lines appearing closer to the observer. The purpose of our experiment was to determine if stereoscopic depth perception would arise from spatially disparate Panum targets when the lines differed in brightness from each other. The present findings indicate that Panum targets which carry both a spatial disparity and a brightness difference give rise to stereoscopic depth perception.

scholarly journals Undetectable Changes in Image Resolution of Luminance-Contrast Gradients Affect Depth Perception

2016 ◽  
Vol 7 ◽  
Author(s):  
Yoshiaki Tsushima ◽  
Kazuteru Komine ◽  
Yasuhito Sawahata ◽  
Toshiya Morita
Keyword(s):  
Depth Perception ◽  
Luminance Contrast ◽  
Image Resolution

Three-dimensional image analysis and visualization in confocal light microscopy

1993 ◽  
Vol 51 ◽  
pp. 158-159
Author(s):  
J. K. Samarabandu ◽  
R. Acharya ◽  
D. R. Pareddy ◽  
P. C. Cheng
Keyword(s):  
Depth Perception ◽  
Computer Graphic ◽  
Three Dimensional ◽  
Cellular Organization ◽  
Data Set ◽  
Computational Burden ◽  
Interactive Operation ◽  
Cell Organization ◽  
Confocal Images ◽  
3D Digitization

In the study of cell organization in a maize meristem, direct viewing of confocal optical sections in 3D (by means of 3D projection of the volumetric data set, Figure 1) becomes very difficult and confusing because of the large number of nucleus involved. Numerical description of the cellular organization (e.g. position, size and orientation of each structure) and computer graphic presentation are some of the solutions to effectively study the structure of such a complex system. An attempt at data-reduction by means of manually contouring cell nucleus in 3D was reported (Summers et al., 1990). Apart from being labour intensive, this 3D digitization technique suffers from the inaccuracies of manual 3D tracing related to the depth perception of the operator. However, it does demonstrate that reducing stack of confocal images to a 3D graphic representation helps to visualize and analyze complex tissues (Figure 2). This procedure also significantly reduce computational burden in an interactive operation.

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