The Apparent Size of Three-Dimensional Objects and Their Silhouettes: A Solid-Superiority Effect

Perception ◽  
1988 ◽  
Vol 17 (1) ◽  
pp. 23-30 ◽  
Author(s):  
James T Walker ◽  
M Jill Walker
Keyword(s):  
Three Dimensional ◽  
Picture Plane ◽  
Apparent Size ◽  
Solid Object ◽  
Superiority Effect ◽  
Three Dimensional Objects ◽  
Lyer Illusion ◽  
Dimensional Object

A solid object looks larger than its outline or silhouette under many viewing conditions. This solid-superiority effect may result from the assimilation or confusion of visual contours within the projection of a three-dimensional object on the picture plane. An aspect of the Müller-Lyer illusion may also play a role.

Effect of Three-Dimensional Object Type and Density in Simulated Low-Level Flight

1988 ◽  
Vol 32 (18) ◽  
pp. 1299-1303 ◽  
Author(s):  
James A. Kleiss ◽  
David G. Curry ◽  
David C. Hubbard
Keyword(s):  
Three Dimensional ◽  
Apparent Size ◽  
Abstract Objects ◽  
Processing Capacity ◽  
Object Type ◽  
Individual Object ◽  
Low Level ◽  
Three Dimensional Objects ◽  
Level Flight ◽  
Dimensional Object

Three-dimensional objects placed on simulated terrain surfaces are particularly effective as cues for altitude in simulated low-level flight. To conserve the limited edge processing capacity of computer image generators (CIGs), objects have typically been simple in shape and therefore fairly abstract in appearance. The present investigation sought to determine whether the apparent size of more detailed and familiar appearing objects (e.g., trees and bushes) serves as an additional cue for altitude in simulated low-level flight. Results showed no differences in performance between abstract objects and familiar objects. However, performance did improve with increases in object density, at least for some performance measures. These results suggest that CIG processing capacity may be most effectively utilized by increasing object density rather than individual object detail.

scholarly journals INTERACTIVE VISUALIZATION TECHNOLOGY IN AUGMENTED REALITY

2021 ◽  
Vol 58 (3) ◽  
pp. 137-142
Author(s):  
A.O. Dauitbayeva ◽  
◽  
A.A. Myrzamuratova ◽  
A.B. Bexeitova ◽  
◽  
...  
Keyword(s):  
Virtual Reality ◽  
Augmented Reality ◽  
User Interfaces ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Linear Perspective ◽  
Three Dimensional Objects ◽  
Visualization Technology ◽  
Image Volume ◽  
Dimensional Object

This article is devoted to the issues of visualization and information processing, in particular, improving the visualization of three-dimensional objects using augmented reality and virtual reality technologies. The globalization of virtual reality has led to the introduction of a new term "augmented reality"into scientific circulation. If the current technologies of user interfaces are focused mainly on the interaction of a person and a computer, then augmented reality with the help of computer technologies offers improving the interface of a person and the real world around them. Computer graphics are perceived by the system in the synthesized image in connection with the reproduction of monocular observation conditions, increasing the image volume, spatial arrangement of objects in a linear perspective, obstructing one object to another, changing the nature of shadows and tones in the image field. The experience of observation is of great importance for the perception of volume and space, so that the user "completes" the volume structure of the observed representation. Thus, the visualization offered by augmented reality in a real environment familiar to the user contributes to a better perception of three-dimensional object.

The Research of Collision Detection Based on OBB in Vega Prime

2012 ◽  
Vol 220-223 ◽  
pp. 2803-2808
Author(s):  
Xiao Ping Wang ◽  
Xiu Cheng Dong
Keyword(s):  
Early Warning ◽  
Collision Detection ◽  
Line Segment ◽  
Three Dimensional ◽  
Trend Line ◽  
Three Dimensional Objects ◽  
Bounding Box ◽  
Object Based ◽  
Early Warning Mechanism ◽  
Dimensional Object

Collision detection in Vega Prime is based on the simple line segment, and collision detection based on bounding box is not realized. By studying the composition of three-dimensional object based on Oriented Bounding Box (OBB), we define a collision detection class, which inherits from vpIsector. After finding out all vertices of geometry in object, we connect these vertices one by one and constitute a tend line. The trend line constitutes our bounding box based on OBB. Now, our collision detection is based on three-dimensional objects, but not the simple line segment. At the same time, we can control the efficiency of collision detection by increasing or decreasing the number of collision lines on the actual demand. Additionally, on this basis, we have made the further application. By adjusting parameter, we can get a bounding box with early warning mechanism or collision tolerance.

Three-Dimensional Object Realization via Direct Volumetric Activation

2017 ◽  
Author(s):  
Andrew J. Birnbaum ◽  
Athanasios P. Iliopoulos ◽  
John C. Steuben ◽  
John G. Michopoulos
Keyword(s):  
Additive Manufacturing ◽  
Capital Investment ◽  
Three Dimensional ◽  
Scaling Behavior ◽  
Maintenance Costs ◽  
Three Dimensional Objects ◽  
Geometric Deviation ◽  
Manufacturing Techniques ◽  
Dimensional Object ◽  
Current Systems

Despite increasing levels of acceptance, traditional additive manufacturing techniques continue to suffer from a number of fundamental drawbacks that act to limit broad adoption. These drawbacks include limits on processable materials, part properties/performance, geometric deviation and repeatability. The vast majority of existing processes also rely on a point-by-point approach to generate parts, resulting in exceedingly long build times and extremely poor scaling behavior. Furthermore, in general, current systems require significant levels of complexity for operation, resulting in the need for considerable upfront capital investment as well as continuing maintenance costs. A new manufacturing approach is presented here, based upon the generation of objects from the direct creation of constituent volumetric sub-regions. This process addresses many of the limitations described above, and has the potential to significantly alter the manner with which three-dimensional objects are realized.

scholarly journals A moment invariant for evaluating the chirality of three-dimensional objects

2010 ◽  
Vol 8 (54) ◽  
pp. 144-151 ◽  
Author(s):  
Johan Hattne ◽  
Victor S. Lamzin
Keyword(s):  
Electron Density ◽  
Three Dimensional ◽  
Peptide Fragments ◽  
Moment Invariant ◽  
Three Dimensional Objects ◽  
Density Maps ◽  
Wide Range ◽  
Polypeptide Backbone ◽  
Dimensional Object ◽  
Electron Density Map

Chirality is an important feature of three-dimensional objects and a key concept in chemistry, biology and many other disciplines. However, it has been difficult to quantify, largely owing to computational complications. Here we present a general chirality measure, called the chiral invariant (CI), which is applicable to any three-dimensional object containing a large amount of data. The CI distinguishes the hand of the object and quantifies the degree of its handedness. It is invariant to the translation, rotation and scale of the object, and tolerant to a modest amount of noise in the experimental data. The invariant is expressed in terms of moments and can be computed in almost no time. Because of its universality and computational efficiency, the CI is suitable for a wide range of pattern-recognition problems. We demonstrate its applicability to molecular atomic models and their electron density maps. We show that the occurrence of the conformations of the macromolecular polypeptide backbone is related to the value of the CI of the constituting peptide fragments. We also illustrate how the CI can be used to assess the quality of a crystallographic electron density map.

scholarly journals PROBES, POPULATIONS, SAMPLES, MEASUREMENTS AND RELATIONS IN STEREOLOGY

2011 ◽  
Vol 19 (1) ◽  
pp. 1 ◽  
Author(s):  
Robert T Dehoff
Keyword(s):  
Internal Structure ◽  
Three Dimensional ◽  
Sample Design ◽  
Typical Problem ◽  
Three Dimensional Objects ◽  
Summary Paper ◽  
Unbiased Estimates ◽  
Dimensional Object ◽  
Almost All ◽  
Simple Count

This summary paper provides an overview of the content of stereology. The typical problem at hand centers around some three dimensional object that has an internal structure that determines its function, performance, or response. To understand and quantify the geometry of that structure it is necessary to probe it with geometric entities: points, lines, planes volumes, etc. Meaningful results are obtained only if the set of probes chosen for use in the assessment is drawn uniformly from the population of such probes for the structure as a whole. This requires an understanding of the population of each kind of probe. Interaction of the probes with the structure produce geometric events which are the focus of stereological measurements. In almost all applications the measurement that is made is a simple count of the number of these events. Rigorous application of these requirements for sample design produce unbiased estimates of geometric properties of features in the structure no matter how complex are the features or what their arrangement in space. It is this assumption-free characteristic of the methodology that makes it a powerful tool for characterizing the internal structure of three dimensional objects.

scholarly journals Digital interactions

2018 ◽  
pp. 3-10
Author(s):  
Eleni Ira Panourgia ◽  
Finbar Wheelaghan ◽  
Xue Yang
Keyword(s):  
Spatial Data ◽  
Three Dimensional ◽  
Digital Signal ◽  
3D Animation ◽  
Media Study ◽  
Three Dimensional Objects ◽  
Visual Spatial ◽  
Sound Control ◽  
Sound Objects ◽  
Dimensional Object

This article discusses a prototype that explores the simultaneous manipulation of three-dimensional digital forms and sound. Our multi-media study examines the aesthetic affordances of tight parameter couplings between digital three-dimensional objects and sound objects based on notions of process and user-machine interaction. It investigates how effective cohesion between visual, spatial and sonic might be established through changes perceived in parallel; what Michel Chion refers to as 'synchresis'. Drawing from Mike Blow's work On the Simultaneous Perception of Sound and Three-Dimensional Objects and processual art, this prototype uses computer technology for forming and mediating a creative practice involving 3D animation, sound synthesis, digital signal processing and programming. Our practice-based approach entails the rendering of a three-dimensional digital object in Processing whose form changes over time according to specific actions. Spatial data is sent via Open Sound Control (OSC) to Max MSP in real time, where sound is synthesized and then manipulated. Sonic parameters such as amplitude, spectral density/width and timbre are controlled by select spatial parameters from the three-dimensional object. Sound processing is realized based on the changing of the three-dimensional object in time through basic actions such as splitting, distorting, cutting, shattering and rotating. We use digital technology to look beyond basic synchronisation of sound and vision to a more complex cohesion of percepts, based on changes to myriad sonic and visual parameters experienced concurrently.

Enhancement Processes in the Visual Detection of Barely Perceptible Targets

1980 ◽  
Vol 24 (1) ◽  
pp. 521-525
Author(s):  
Mary Williams ◽  
Naomi Weisstein ◽  
James Brown
Keyword(s):  
Line Segment ◽  
Visual Detection ◽  
Three Dimensional ◽  
Visual Response ◽  
Superiority Effect ◽  
Diagonal Line ◽  
Spatial Frequencies ◽  
Image Blurring ◽  
Auxiliary Lines ◽  
Dimensional Object

When a target consisting of a briefly flashed diagonal line segment is combined with a set of auxiliary lines (the context pattern) to yield the perception of a connected, three-dimensional object, it can be identified more accurately than when the context pattern yields a flatter, fragmented perception. This is the object-superiority effect (Weisstein & Harris, 1974). The present experiments utilized six context patterns that yielded significantly different ratings of perceived depth, and three context patterns that yielded significantly different ratings of perceived connectedness. Observers judged which of two target lines was presented; the line was briefly flashed alone or was accompanied by one of the nine context patterns. The context pattern appeared simultaneously or followed the target by a delay of 30 to 270 msec. Results showed that both the variations in perceived depth and the variations in perceived connectedness produced differences in metacontrast functions. Visual response to different spatial frequencies was also tested by blurring the stimuli — thus diminishing visual response to high spatial frequencies. Results showed that blurring the stimuli had dramatic effects on the temporal functions of accuracy versus delay of the context patterns varying in perceived depth (metacontrast functions): the functions for the patterns rated higher in depth became more like those for the flatter patterns. The differences in the metacontrast functions produced by connected versus fragmented patterns were maintained under image blurring. These results were closely related to the way perceived depth and connectedness ratings diminished as the context patterns were blurred. Our findings suggest that the visual channels that respond to high and low spatial frequencies also have different temporal responses to apparent three-dimensionality and connectedness.

Three-Dimensional Illusory Objects Produced by Rotation in Depth

Perception ◽  
1994 ◽  
Vol 23 (8) ◽  
pp. 905-912 ◽  
Author(s):  
Ilpo Kojo ◽  
Marja Liinasuo ◽  
Jyrki Rovamo
Keyword(s):  
Computer Animation ◽  
Three Dimensional ◽  
Vertical Axis ◽  
Illusory Figure ◽  
Three Dimensional Objects ◽  
Dimensional Object

Rotation of a Kanizsa triangle in depth around its vertical axis causes a perception of a three-dimensional object with a flat, rigid illusory triangle between the inducing discs. When the inducing discs of a Kanizsa triangle were made thicker, the illusory triangle between the discs also became thicker. In the experiments both computer animation and real inducers made of plastic were used. The method promoted border perception in a three-dimensional illusory figure. We suggest that the perception of three-dimensional illusory objects is due to a process which is also used in the perception of real three-dimensional objects.

scholarly journals PENGEMBANGAN MEDIA VIDEO PEMBELAJARAN PENGHANTAR LISTRIK DILENGKAPI OBJEK TIGA DIMENSI PADA MATA KULIAH KABEL DAN TEKNIK PEMASANGANNYA DI PROGRAM STUDI PENDIDIKAN TEKNIK ELEKTRO UNIVERSITAS PENDIDIKAN GANESHA

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Gede Setiadarma ◽  
Agus Adiarta ◽  
Nyoman Santiyadnya
Keyword(s):  
Three Dimensional ◽  
Field Trials ◽  
Learning Objects ◽  
Three Dimensions ◽  
Instructional Video ◽  
Three Dimensional Objects ◽  
Media Learning ◽  
Dimensional Object ◽  
Electrical Conductors ◽  
Group Trial

Research development aims to: 1) create a media instructional videos electrically conductive include three-dimensional objects, 2) determine the feasibility of video media learning electrical conductors include three-dimensional object, 3) determine the response of students to use video media learning electrical conductors include three-dimensional object. This research is a study of R & D to adapt the pace of development of Sugiyono development model. Media that was developed in the validation by experts and expert media content. Calculation of instruments to the experts and field trials using a scale Linkert. The results of this study in the form of video media products and media learning objects in three dimensions. The results of the percentage gain media expert feasibility level by 98, 67% with a very decent qualifications and earn a percentage of content expert feasibility level of 100% with a very decent qualifications. Results of a small study group trial amounted to 91.27% (excellent qualifications) and a large group trial that shows a student's response amounted to 93.72% (excellent qualifications). So media instructional video and three-dimensional objects that are developed feasible in the subject of wiring and installation techniques for the third semester students of Electrical Engineering Education Program Undiksha.

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