Unsupervised upright orientation of man-made models

2012 ◽  
Vol 74 (4) ◽  
pp. 99-108 ◽  
Author(s):  
Yong Jin ◽  
Qingbiao Wu ◽  
Ligang Liu
Keyword(s):  
Upright Orientation

Biological Motion Perception: From Inversion to Upright Display Orientation

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 118-118
Author(s):  
M A Pavlova
Keyword(s):  
Motion Perception ◽  
Biological Motion ◽  
Presentation Rate ◽  
Event Perception ◽  
Veridical Perception ◽  
Invariant Structure ◽  
Upright Orientation ◽  
Biological Motion Perception ◽  
The Right ◽  
Perception Of Biological Motion

How does biological motion perception change with display orientation? As previously shown, display inversion (180°) completely prevents veridical perception of biological motion. However, with upright orientation (0°), observers are able to recover the invariant structure through biological motion despite reverse transformation (showing the film backwards) or changing the presentation rate (Pavlova, 1995 Perception24 Supplement, 112). In the present experiments, observers saw the biological motion pattern at various display deviations, from inverted to upright orientation (180°, 150°, 120°, 90°, 60°, 30°, 0°), in the right or left hemifield, on a circular screen monitor. The display consisted of an array of 11 dots on the main joints of an invisible walker moving as if on a treadmill. While viewing (60 s), observers pressed a key each time their perception changed from one stable percept to another (eg when the direction of apparent rotation of the pattern reversed). The perceived multistability (the number of key-presses) increased as orientation was varied from inverted to 90°, and then decreased between 90° and upright. The recognition of walking figure improved abruptly with changing orientation: at deviations of 60° and 30° most observer reported seeing the walking figure spontaneously, yet the pattern was seen as multistable. The findings imply the relative power of constraints (such as orientation) in perception of biological motion that is discussed in relation to the KSD principle in event perception [Runeson, 1994, in Perceiving Events and Objects Eds Jansson, Epstein, Bergström (Hillsdale, NJ: Erlbaum) pp 383 – 405].

scholarly journals Quantum cards and quantum rods

Open Physics ◽  
2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Milan Batista ◽  
Joze Peternelj
Keyword(s):  
Mechanical Analysis ◽  
Quantum Mechanical ◽  
Upright Orientation ◽  
Energy Eigenstates ◽  
Quantum Rods ◽  
Rigid Rod

AbstractQuantum mechanical analysis of a rigid rod with one end fixed to a flat table is presented. Assuming that the rod is initally in the upright orientation, “the time of fall” is calculated using WKB wavefunctions representing energy eigenstates near the barrier summit.

scholarly journals Mineral, petrography and petro-geochemical characteristics of diabasic dykes at the Trai Mat quarry, Da Lat City

2016 ◽  
Vol 19 (1) ◽  
pp. 94-100
Author(s):  
Phuc Duc Le
Keyword(s):  
Biotite Granite ◽  
Geochemical Characteristics ◽  
Coarse Grained ◽  
Chemical Components ◽  
Upright Orientation ◽  
Mineral Components

The diabasic dykes exposed at the Trai Mat quarry, Da Lat city intrude the granitoids of Ankroet complex (such as middle – coarse grained biotite granite and leucogranites. As can be seen in the field the thickess of these dykes vary from 0.5m to nearly 1.5 m extended north-south-east slope angles ranging from ~50 0 to being upright (Orientation of lying 31<50 ÷ 90 o). Petographical components consist of diabaz porphyrite. The main mineral components are plagioclase, pyroxene?, quartz, carbonate, chloride. Chemical components of rocks are: SiO2: 54.34 %, K2O: 2.43 %,Na2O: 2,50 %. The content of W, Pb, U, Th, Hf, Rb, Au is higher

Accuracy of Saccades to Remembered Targets as a Function of Body Orientation in Space

2003 ◽  
Vol 90 (1) ◽  
pp. 521-524 ◽  
Author(s):  
Joshua T. Vogelstein ◽  
Lawrence H. Snyder ◽  
Dora E. Angelaki
Keyword(s):  
Eye Movements ◽  
Rhesus Monkeys ◽  
Saccadic Eye Movements ◽  
Body Axis ◽  
Body Orientation ◽  
Upright Orientation ◽  
The Asymmetry

A vertical asymmetry in memory-guided saccadic eye movements has been previously demonstrated in humans and in rhesus monkeys. In the upright orientation, saccades generally land several degrees above the target. The origin of this asymmetry has remained unknown. In this study, we investigated whether the asymmetry in memory saccades is dependent on body orientation in space. Thus animals performed memory saccades in four different body orientations: upright, left-side-down (LSD), right-side-down (RSD), and supine. Data in all three rhesus monkeys confirm previous observations regarding a significant upward vertical asymmetry. Saccade errors made from LSD and RSD postures were partitioned into components made along the axis of gravity and along the vertical body axis. Up/down asymmetry persisted only in body coordinates but not in gravity coordinates. However, this asymmetry was generally reduced in tilted positions. Therefore the upward bias seen in memory saccades is egocentric although orientation in space might play a modulatory role.

Effects of a Heel Wedge in Horses with Superficial Digital Flexor Tendinitis

2000 ◽  
Vol 13 (01) ◽  
pp. 01-08 ◽  
Author(s):  
M. A. Willemen ◽  
J. L. Lanovaz ◽  
H. C. Schamhardt ◽  
Hilary Clayton
Keyword(s):  
Repeated Measures ◽  
Inverse Dynamics ◽  
Extensor Tendon ◽  
Dorsal Side ◽  
Upright Orientation ◽  
Suspensory Ligament ◽  
Appropriate Treatment ◽  
Force Data ◽  
Mechanical Consequence ◽  
Dynamics Method

SummaryThe objective was to determine whether the use of heel wedges is an appropriate treatment for superficial digital flexor (SDF) tendinitis. The subjects were six warmblood horses in which SDF tendinitis was induced in one forelimb using a collagenase model. The stride characteristics were compared under four conditions: flat shoes; 6° heel wedge following a one hour adaptation; 6° heel wedge following five days adaptation; and one hour after reapplication of flat shoes. Videographic and force data were collected for both forelimbs during the stance phase of the trot, and were combined with morphometric measurements using an inverse dynamics method to calculate net joint moments and joint powers at each of the joints of the forelimbs. Repeated measures ANOVA was used to compare the stride variables across conditions in the lame limb and in the compensating forelimb. Significant kinematic changes in response to the use of heel wedges were confined to the coffin joint which was more flexed due to the more upright orientation of the hoof segment. The onset of breakover was delayed with the hoof wedges. In the compensating limb only, the use of heel wedges was associated with a shift of the net joint moment to the dorsal side of the coffin joint during the first one third of stance. Both forelimbs had significantly smaller peak palmar moments at the coffin joint with heel wedges in the second half of stance, which appeared to be a mechanical consequence of the more flexed position of the coffin joint. Tension was increased in the extensor branches of the suspensory ligament and common digital extensor tendon on the dorsal side, and reduced in the deep digital flexor tendon and its distal accessory ligament on the palmar side. Less energy was absorbed across the coffin joint in both limbs with heel wedges. The study did not reveal changes associated with the use of heel wedges that could be interpreted as a reduction of the effects of lameness due to SDF tendinitis.The objective was to determine whether the application of 60 heel wedges was appropriate for treating horses with superficial digital flexor (SDF) tendinitis. The significant effects of the heel wedges affected the coffin joint and included a more flexed position due to the more upright orientation of the hoof segment, a reduction in the peak palmar moment and less energy absorption across the joint. Since these changes were confined to the coffin joint, they were not interpreted as being beneficial in treating lameness due to SDF tendinitis.

scholarly journals Upright orientation of man-made objects

2008 ◽  
Author(s):  
Hongbo Fu ◽  
Daniel Cohen-Or ◽  
Gideon Dror ◽  
Alla Sheffer
Keyword(s):  
Upright Orientation

scholarly journals The effect of scrambling upright and inverted faces on the N170

2018 ◽  
Vol 71 (11) ◽  
pp. 2464-2476 ◽  
Author(s):  
Ciro Civile ◽  
Heike Elchlepp ◽  
Rossy McLaren ◽  
Carl Michael Galang ◽  
Aureliu Lavric ◽  
...  
Keyword(s):  
Present Experiment ◽  
Event Related Potentials ◽  
Inversion Effect ◽  
Upright Orientation ◽  
Face Inversion Effect ◽  
Configural Information ◽  
The Face ◽  
Related Potentials ◽  
Stimulus Features ◽  
The Impact

The face inversion effect refers to a decrement in performance when we try to recognise familiar faces turned upside down (inverted), compared with familiar faces presented in their usual (upright) orientation. Recently, we have demonstrated that the inversion effect can also be found with checkerboards drawn from prototype-defined categories when the participants have been trained with these categories, suggesting that factors such as expertise and the relationships between stimulus features may be important determinants of this effect. We also demonstrated that the typical inversion effect on the N170 seen with faces is found with checkerboards, suggesting that modulation of the N170 is a marker for disruption in the use of configural information. In the present experiment, we first demonstrate that our scrambling technique greatly reduces the inversion effect in faces. Following this, we used Event-Related Potentials ( ERPs) recorded while participants performed an Old/New recognition study on normal and scrambled faces presented in both upright and inverted orientations to investigate the impact of scrambling on the N170. We obtained the standard robust inversion effect for normal faces: The N170 was both larger and delayed for normal inverted faces as compared with normal upright faces, whereas a significantly reduced inversion effect was recorded for scrambled faces. These results show that the inversion effect on the N170 is greater for normal compared with scrambled faces, and we interpret the smaller effect for scrambled faces as being due to the reduction in expertise for those faces consequent on scrambling.

Automatic upright orientation and good view recognition for 3D man-made models

2012 ◽  
Vol 45 (4) ◽  
pp. 1524-1530 ◽  
Author(s):  
Cong-Kai Lin ◽  
Wen-Kai Tai
Keyword(s):  
Upright Orientation ◽  
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