scholarly journals Eccentricity-dependent sensitivity loss of amplitude spectrum slope discrimination.

2013 ◽  
Vol 13 (9) ◽  
pp. 1237-1237
Author(s):  
A. Johnson ◽  
B. Richard ◽  
D. Ellemberg ◽  
B. Hansen
Keyword(s):  
Amplitude Spectrum ◽  
Sensitivity Loss ◽  
Spectrum Slope

scholarly journals Amplitude Spectrum Slope is More Important than Orientation in Rapid Scene Categorization

2012 ◽  
Vol 12 (9) ◽  
pp. 844-844
Author(s):  
R. V. Ringer ◽  
B. C. Hansen ◽  
K. Byrne ◽  
A. M. Larson ◽  
J. Zuercher ◽  
...  
Keyword(s):  
Amplitude Spectrum ◽  
Scene Categorization ◽  
Spectrum Slope

scholarly journals Symmetry Modulates the Amplitude Spectrum Slope Effect on Visual Preference

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1820
Author(s):  
Chia-Ching Wu ◽  
Chien-Chung Chen
Keyword(s):  
Modulation Depth ◽  
Amplitude Spectrum ◽  
Quadratic Function ◽  
Natural Image ◽  
Human Observer ◽  
Aesthetic Value ◽  
Preference Rating ◽  
Two Factors ◽  
Amplitude Decrease ◽  
Spectrum Slope

Within the spectrum of a natural image, the amplitude of modulation decreases with spatial frequency. The speed of such an amplitude decrease, or the amplitude spectrum slope, of an image affects the perceived aesthetic value. Additionally, a human observer would consider a symmetric image more appealing than they would an asymmetric one. We investigated how these two factors jointly affect aesthetic preferences by manipulating both the amplitude spectrum slope and the symmetric level of images to assess their effects on aesthetic preference on a 6-point Likert scale. Our results showed that the preference ratings increased with the symmetry level but had an inverted U-shaped relation to amplitude spectrum slope. In addition, a strong interaction existed between symmetry level and amplitude spectrum slope on preference rating, in that symmetry can amplify the amplitude spectrum slope’s effects. A quadratic function of the spectrum slope can describe such effects. That is, preference is an inverted U-shaped function of spectrum slope whose intercept is determined by the number of symmetry axes. The modulation depth of the quadratic function manifests the interaction between the two factors.

scholarly journals Center-surround effects in human discrimination of amplitude spectrum slope

2010 ◽  
Vol 7 (9) ◽  
pp. 967-967
Author(s):  
A. Johnson ◽  
B. Hansen ◽  
D. Ellemberg
Keyword(s):  
Amplitude Spectrum ◽  
Spectrum Slope

scholarly journals Aesthetic Judgement of Orientation in Modern Art

i-Perception ◽  
2012 ◽  
Vol 3 (1) ◽  
pp. 18-24 ◽  
Author(s):  
George Mather
Keyword(s):  
Modern Art ◽  
Amplitude Spectrum ◽  
Fourier Amplitude ◽  
Physical Measure ◽  
Aesthetic Judgement ◽  
Correct Orientation ◽  
Perfect Performance ◽  
Fourier Amplitude Spectrum ◽  
The Impact ◽  
Spectrum Slope

When creating an artwork, the artist makes a decision regarding the orientation at which the work is to be hung based on their aesthetic judgement and the message conveyed by the piece. Is the impact or aesthetic appeal of a work diminished when it is hung at an incorrect orientation? To investigate this question, Experiment 1 asked whether naïve observers can appreciate the correct orientation (as defined by the artist) of 40 modern artworks, some of which are entirely abstract. Eighteen participants were shown 40 paintings in a series of trials. Each trial presented all four cardinal orientations on a computer screen, and the participant was asked to select the orientation that was most attractive or meaningful. Results showed that the correct orientation was selected in 48% of trials on average, significantly above the 25% chance level, but well below perfect performance. A second experiment investigated the extent to which the 40 paintings contained recognisable content, which may have mediated orientation judgements. Recognition rates varied from 0% for seven of the paintings to 100% for five paintings. Orientation judgements in Experiment 1 correlated significantly with “meaningful” content judgements in Experiment 2: 42% of the variance in orientation judgements in Experiment 1 was shared with recognition of meaningful content in Experiment 2. For the seven paintings in which no meaningful content at all was detected, 41% of the variance in orientation judgements was shared with variance in a physical measure of image content, Fourier amplitude spectrum slope. For some paintings, orientation judgements were quite consistent, despite a lack of meaningful content. The origin of these orientation judgements remains to be identified.

scholarly journals Discrimination of amplitude spectrum slope of natural scenes during childhood

2010 ◽  
Vol 7 (9) ◽  
pp. 962-962
Author(s):  
D. Ellemberg ◽  
B. Hansen ◽  
A. Johnson
Keyword(s):  
Amplitude Spectrum ◽  
Natural Scenes ◽  
Spectrum Slope

scholarly journals Adaptation to the Amplitude Spectrum Slope of Natural Scenes in Modified Reality

2019 ◽  
Vol 19 (10) ◽  
pp. 188c
Author(s):  
Bruno Richard ◽  
Patrick Shafto
Keyword(s):  
Amplitude Spectrum ◽  
Natural Scenes ◽  
Spectrum Slope

Estimation of PSF Using Logarithmic Amplitude Spectrum and Restoration of Blurred Image

2012 ◽  
Vol 132 (2) ◽  
pp. 284-290
Author(s):  
Yuka Nagashima ◽  
Shigeru Omatu ◽  
Michifumi Yoshioka
Keyword(s):  
Amplitude Spectrum ◽  
Blurred Image

THE EMPIRICAL GREEN’S FUNCTION TECHNIQUE MODIFICATION FOR ACCELEROGRAM SYNTHESIS IN LOWSEISMICITY REGIONS

2018 ◽  
Vol 12 (5-6) ◽  
pp. 72-80
Author(s):  
A. A. Krylov
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Main Shock ◽  
Amplitude Spectrum ◽  
Strong Motion ◽  
Function Technique ◽  
Focal Region ◽  
Empirical Green’S Function ◽  
Epicentral Zone ◽  
Empirical Green's Function

In the absence of strong motion records at the future construction sites, different theoretical and semi-empirical approaches are used to estimate the initial seismic vibrations of the soil. If there are records of weak earthquakes on the site and the parameters of the fault that generates the calculated earthquake are known, then the empirical Green’s function can be used. Initially, the empirical Green’s function method in the formulation of Irikura was applied for main shock record modelling using its aftershocks under the following conditions: the magnitude of the weak event is only 1–2 units smaller than the magnitude of the main shock; the focus of the weak event is localized in the focal region of a strong event, hearth, and it should be the same for both events. However, short-termed local instrumental seismological investigation, especially on seafloor, results usually with weak microearthquakes recordings. The magnitude of the observed micro-earthquakes is much lower than of the modeling event (more than 2). To test whether the method of the empirical Green’s function can be applied under these conditions, the accelerograms of the main shock of the earthquake in L'Aquila (6.04.09) with a magnitude Mw = 6.3 were modelled. The microearthquake with ML = 3,3 (21.05.2011) and unknown origin mechanism located in mainshock’s epicentral zone was used as the empirical Green’s function. It was concluded that the empirical Green’s function is to be preprocessed. The complex Fourier spectrum smoothing by moving average was suggested. After the smoothing the inverses Fourier transform results with new Green’s function. Thus, not only the amplitude spectrum is smoothed out, but also the phase spectrum. After such preliminary processing, the spectra of the calculated accelerograms and recorded correspond to each other much better. The modelling demonstrate good results within frequency range 0,1–10 Hz, considered usually for engineering seismological studies.

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