Recovering 3-D Shape: Roles of Absolute and Relative Disparity, Retinal Size, and Viewing Distance as Studied with Reverse-Perspective Stimuli

Perception ◽  
10.1068/p7409 ◽  
2013 ◽  
Vol 42 (4) ◽  
pp. 430-446 ◽  
Author(s):  
Joshua J Dobias ◽  
Thomas V Papathomas
Keyword(s):  
Retinal Size ◽  
Viewing Distance

Some Influences of Visual Angle and Retinal Speed on Measures of the Spiral Aftereffect

1970 ◽  
Vol 30 (1) ◽  
pp. 215-227 ◽  
Author(s):  
Mary Jane Williams ◽  
William E. Collins
Keyword(s):  
Visual Angle ◽  
Retinal Size ◽  
Viewing Distance ◽  
Size Constancy ◽  
Intensity Measures ◽  
Under Five ◽  
Distance Constant ◽  
Constant Distance ◽  
Physical Variables ◽  
Apparent Influence

Duration and intensity of the SAE were judged under five conditions: Angle Constant (A)—retinal speed and visual angle were held constant across several spiral-size, viewing-distance combinations; Size-Constant—a single spiral size was used at several distances, with retinal speed either varied (S1) or held constant (S2); Distance Constant—several spiral sizes were used at a constant distance with retinal speed either varied (D1) or held constant (D2). Duration and intensity measures were affected similarly, with perceptual rather than physical variables seeming to account for the results. Assuming that perfect size constancy occurred during the experiment, SAE durations were longer, in general, for larger values of perceived size per unit of retinal size. Retinal speed variation had no apparent influence, except possibly at low values.

Legibility of text as a function of color combinations and viewing distance.

1983 ◽  
Author(s):  
Lars-Goeran Nilsson ◽  
Kjell Ohlsson ◽  
Jerker Roennberg
Keyword(s):  
Viewing Distance ◽  
Color Combinations

Monitor Viewing Distance for Younger and Older Workers

2008 ◽  
Author(s):  
Neil Charness ◽  
Katinka Dijkstra ◽  
Tiffany Jastrzembski ◽  
Sallie Weaver ◽  
Michael Champion
Keyword(s):  
Older Workers ◽  
Viewing Distance

Using watermark visibility measurements to select an optimized pair of spot colors for use in a binary watermark

2020 ◽  
Vol 2020 (15) ◽  
pp. 197-1-197-7
Author(s):  
Alastair Reed ◽  
Vlado Kitanovski ◽  
Kristyn Falkenstern ◽  
Marius Pedersen
Keyword(s):  
Food Packaging ◽  
Red Light ◽  
Human Observer ◽  
Viewing Distance ◽  
Point Of Sale ◽  
Complementary Color ◽  
Low Visibility ◽  
Packaging Industry ◽  
Spot Color ◽  
Selection Of

Spot colors are widely used in the food packaging industry. We wish to add a watermark signal within a spot color that is readable by a Point Of Sale (POS) barcode scanner which typically has red illumination. Some spot colors such as blue, black and green reflect very little red light and are difficult to modulate with a watermark at low visibility to a human observer. The visibility measurements that have been made with the Digimarc watermark enables the selection of a complementary color to the base color which can be detected by a POS barcode scanner but is imperceptible at normal viewing distance.

3D Image Depth Enlargement in Large Edge-Based DFD Display with Long Viewing Distance by Blurring Edge Images

2019 ◽  
pp. 183
Author(s):  
Hideto Matsubara ◽  
Haruki Mizushina ◽  
Shiro Suyama
Keyword(s):  
Viewing Distance ◽  
3D Image ◽  
Edge Based ◽  
Image Depth

Magnification of Imagery to Compensate for the Decrease in Perceived Size Associated With a 28-Inch Viewing Distance

1999 ◽  
Author(s):  
Byron J. Pierce ◽  
George A. Geri
Keyword(s):  
Viewing Distance

Evaluation and Comparison of Artificial Intelligence Vision Aids: Orcam MyEye 1 and Seeing AI

2021 ◽  
pp. 0145482X2110274
Author(s):  
Christina Granquist ◽  
Susan Y. Sun ◽  
Sandra R. Montezuma ◽  
Tu M. Tran ◽  
Rachel Gage ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Human Performance ◽  
Visual Impairments ◽  
Light Level ◽  
Viewing Distance ◽  
Light Perception ◽  
Time To Completion ◽  
Significant Difference ◽  
Text Reading ◽  
Size Contrast

Introduction: We compared the print-to-speech properties and human performance characteristics of two artificial intelligence vision aids, Orcam MyEye 1 (a portable device) and Seeing AI (an iPhone and iPad application). Methods: There were seven participants with visual impairments who had no experience with the two reading aids. Four participants had no light perception. Two individuals with measurable acuity and one with light perception were tested while blindfolded. We also tested performance with text of varying appearance in varying viewing conditions. To evaluate human performance, we asked the participants to use the devices to attempt 12 reading tasks similar to activities of daily living. We assessed the ranges of text attributes for which reading was possible, such as print size, contrast, and light level. We also assessed if individuals could complete tasks with the devices and measured accuracy and completion time. Participants also completed a survey concerning the two aids. Results: Both aids achieved greater than 95% accuracy in text recognition for flat, plain word documents and ranged from 13 to 57% accuracy for formatted text on curved surfaces. Both aids could read print sizes as small as 0.8M (20/40 Snellen equivalent, 40 cm viewing distance). Individuals successfully completed 71% and 55% ( p = .114) of tasks while using Orcam MyEye 1 and Seeing AI, respectively. There was no significant difference in time to completion of tasks ( p = .775). Individuals believed both aids would be helpful for daily activities. Discussion: Orcam MyEye 1 and Seeing AI had similar text-reading capability and usability. Both aids were useful to users with severe visual impairments in performing reading tasks. Implications for Practitioners: Selection of a reading device or aid should be based on individual preferences and prior familiarity with the platform, since we found no clear superiority of one solution over the other.

Dependence of Anomaloscope Matching on Viewing Distance or Field Size

Nature ◽  
1947 ◽  
Vol 160 (4053) ◽  
pp. 23-24 ◽  
Author(s):  
R. G. HORNER ◽  
E. T. PURSLOW
Keyword(s):  
Field Size ◽  
Viewing Distance

Three-dimensional auto-stereoscopic animated image with a long viewing distance using high-precision image correction

2009 ◽  
Author(s):  
Takehito Teraguchi ◽  
Hiromasa Yamashita ◽  
Ken Masamune ◽  
Takeyoshi Dohi ◽  
Hongen Liao
Keyword(s):  
High Precision ◽  
Three Dimensional ◽  
Viewing Distance ◽  
Image Correction
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