Dither removing of three-dimensional OCT retinal image

2020 ◽  
Author(s):  
pinghe wang
Keyword(s):  
Retinal Image ◽  
Three Dimensional

Occlusion Constraints and Stereoscopic Slant

Perception ◽  
1997 ◽  
Vol 26 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Jukka Häkkinen ◽  
Göte Nyman
Keyword(s):  
Binocular Vision ◽  
Retinal Image ◽  
Three Dimensional ◽  
Vertical Axis ◽  
The Other ◽  
Necessary Condition ◽  
Slant Perception ◽  
Frontoparallel Plane ◽  
Reduction Effect

In binocular vision horizontal magnification of one retinal image leads to a percept of three-dimensional slant around a vertical axis. It is demonstrated that the perception of slant is diminished when an occlusion interpretation is possible. A frontoparallel plane located in the immediate vicinity of a slanted surface in a location which allows a perception of occlusion reduces the magnitude of perceived slant significantly. When the same plane is placed on the other side, the slant perception is normal because there is no alternative occlusion interpretation. The results indicate that a common border between the occluder and a slanted surface is not a necessary condition for the reduction effect. If the edges are displaced and the edge of the slanted surface is placed in a location in which it could be occluded, the effect still appears.

Perceived Continuity of Occluded Visual Objects

1995 ◽  
Vol 6 (3) ◽  
pp. 182-186 ◽  
Author(s):  
Steven Yantis
Keyword(s):  
Retinal Image ◽  
Three Dimensional ◽  
Visual Object ◽  
Neural Signals ◽  
Visual Objects ◽  
Surface Layout ◽  
Visual Tasks ◽  
Motion Display ◽  
Observer Motion ◽  
The Brain

The human visual system does not rigidly preserve the properties of the retinal image as neural signals are transmitted to higher areas of the brain Instead, it generates a representation that captures stable surface properties despite a retinal image that is often fragmented in space and time because of occlusion caused by object and observer motion The recovery of this coherent representation depends at least in part on input from an abstract representation of three-dimensional (3-D) surface layout In the two experiments reported, a stereoscopic apparent motion display was used to investigate the perceived continuity of a briefly interrupted visual object When a surface appeared in front of the object's location during the interruption, the object was more likely to be perceived as persisting through the interruption (behind an occluder) than when the surface appeared behind the object's location under otherwise identical stimulus conditions The results reveal the influence of 3-D surface-based representations even in very simple visual tasks

‘Generic-View Principle’ for Three-Dimensional-Motion Perception: Optics and Inverse Optics of a Moving Straight Bar

Perception ◽  
1996 ◽  
Vol 25 (7) ◽  
pp. 797-814 ◽  
Author(s):  
Michiteru Kitazaki ◽  
Shinsuke Shimojo
Keyword(s):  
Visual System ◽  
Motion Perception ◽  
Retinal Image ◽  
General Framework ◽  
Three Dimensional ◽  
Image Motion ◽  
Optical Process ◽  
Retinal Image Motion ◽  
The Subject ◽  
Three Components

The generic-view principle (GVP) states that given a 2-D image the visual system interprets it as a generic view of a 3-D scene when possible. The GVP was applied to 3-D-motion perception to show how the visual system decomposes retinal image motion into three components of 3-D motion: stretch/shrinkage, rotation, and translation. First, the optical process of retinal image motion was analyzed, and predictions were made based on the GVP in the inverse-optical process. Then experiments were conducted in which the subject judged perception of stretch/shrinkage, rotation in depth, and translation in depth for a moving bar stimulus. Retinal-image parameters—2-D stretch/shrinkage, 2-D rotation, and 2-D translation—were manipulated categorically and exhaustively. The results were highly consistent with the predictions. The GVP seems to offer a broad and general framework for understanding the ambiguity-solving process in motion perception. Its relationship to other constraints such as that of rigidity is discussed.

Dither Removing of Three-Dimensional Optical Coherence Tomography Retinal Image

2019 ◽  
Vol 39 (3) ◽  
pp. 0317001
Author(s):  
汪权 Wang Quan ◽  
朋汉林 Peng Hanlin ◽  
汪平河 Wang Pinghe ◽  
樊金宇 Fan Jinyu ◽  
刘敬璇 Liu Jingxuan ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Retinal Image ◽  
Three Dimensional ◽  
Optical Coherence

Constancy of Height and Speed in Three-Dimensional Information Displays

2017 ◽  
Vol 61 (1) ◽  
pp. 1562-1566
Author(s):  
Douglas J. Gillan
Keyword(s):  
Retinal Image ◽  
Three Dimensional ◽  
Image Size ◽  
Physical Size ◽  
Depth Cues ◽  
Information Displays ◽  
Pictorial Cues ◽  
Actual Height ◽  
Perceived Speed ◽  
Emmert’S Law

Pictorial cues to depth create a three-dimensional appearance in two-dimensional displays. With sufficient pictorial depth cues, a given physical size appears to be larger at a greater perceived distance (or the perceived size is constant at different perceived depths, despite changes in the retinal image – size constancy). Two experiments investigated the effects of perceived depth on the relation between the actual height of an object and the perceived height (Experiment 1) and the relation between the actual speed of the object the perceived speed (Experiment 2). Consistent with Emmert’s Law (Perceived Size = Retinal Image Size x Perceived Depth), perceived depth influenced both perceived height and perceived speed. These findings suggest that displays that use pictorial cues to depth could easily result in misperception of the height or speed of objects in the display.

Symmetry and Uprightness in Visually Perceived Forms

2017 ◽  
Author(s):  
Lydia M. Maniatis
Keyword(s):  
Visual System ◽  
Retinal Image ◽  
Mirror Symmetry ◽  
Three Dimensional ◽  
Vertical Axis ◽  
Two Dimensional ◽  
Retinal Projection ◽  
Retinal Surface ◽  
Axis Of Symmetry

Why do some two-dimensional (2D) drawings look three-dimensional (3D)? The answer is because their projection on our retinas is consistent with a 3D percept that has a “better” shape and orientation than the 2D figure. Whenever a retinal projection is interpreted by the visual system as the projection of a surface that is not frontoparallel (i.e., not parallel to the retinal surface), then the retinal image will differ in shape from the source of the projection in (a) the sizes of its internal angles and/or (b) the relative extents of its surfaces. The latter differences arise because, when an extent is assumed to be receding, then it must also be assumed to have undergone foreshortening in the projection. Using pictures, we can show that the visual system likes more, rather than less, mirror symmetry and a vertical axis of symmetry more than a tilted one.

scholarly journals Segmentation of Three-dimensional Retinal Image Data

2007 ◽  
Vol 13 (6) ◽  
pp. 1719-1726 ◽  
Author(s):  
A.R. Fuller ◽  
R.J. Zawadzki ◽  
S. Choi ◽  
D.F. Wiley ◽  
J.S. Werner ◽  
...  
Keyword(s):  
Retinal Image ◽  
Three Dimensional ◽  
Image Data

Three-Dimensional Vestibuloocular Reflex of the Monkey: Optimal Retinal Image Stabilization Versus Listing's Law

2000 ◽  
Vol 83 (6) ◽  
pp. 3264-3276 ◽  
Author(s):  
Hubert Misslisch ◽  
Bernhard J. M. Hess
Keyword(s):  
Retinal Image ◽  
Three Dimensional ◽  
Oculomotor Control ◽  
Slow Phase ◽  
Eye Position ◽  
Vestibuloocular Reflex ◽  
Image Stabilization ◽  
Listing's Law ◽  
Listing’S Law ◽  
Visual Background

If the rotational vestibuloocular reflex (VOR) were to achieve optimal retinal image stabilization during head rotations in three-dimensional space, it must turn the eye around the same axis as the head, with equal velocity but in the opposite direction. This optimal VOR strategy implies that the position of the eye in the orbit must not affect the VOR. However, if the VOR were to follow Listing's law, then the slow-phase eye rotation axis should tilt as a function of current eye position. We trained animals to fixate visual targets placed straight ahead or 20° up, down, left or right while being oscillated in yaw, pitch, and roll at 0.5–4 Hz, either with or without a full-field visual background. Our main result was that the visually assisted VOR of normal monkeys invariantly rotated the eye around the same axis as the head during yaw, pitch, and roll (optimal VOR). In the absence of a visual background, eccentric eye positions evoked small axis tilts of slow phases in normal animals. Under the same visual condition, a prominent effect of eye position was found during roll but not during pitch or yaw in animals with low torsional and vertical gains following plugging of the vertical semicircular canals. This result was in accordance with a model incorporating a specific compromise between an optimal VOR and a VOR that perfectly obeys Listing's law. We conclude that the visually assisted VOR of the normal monkey optimally stabilizes foveal as well as peripheral retinal images. The finding of optimal VOR performance challenges a dominant role of plant mechanics and supports the notion of noncommutative operations in the oculomotor control system.

scholarly journals Three-dimensional retinal image stability during visual tilt discrimination in the rabbit

1990 ◽  
Vol 40 (1) ◽  
pp. 61-65
Author(s):  
J. Van der Steen ◽  
J.H. Reuter ◽  
M.W. Van Hof
Keyword(s):  
Retinal Image ◽  
Three Dimensional
Sign in / Sign up

Export Citation Format

Share Document