Efficient and Viable Handling of Large Object Traces

Quick Response QR barcode detection in nonarbitrary environment is still a challenging task despite many existing applications for finding 2D symbols. The main disadvantage of recent applications for QR code detection is a low performance for rotated and distorted single or multiple symbols in images with variable illumination and presence of noise. In this paper, a particular solution for QR code detection in uncontrolled environments is presented. The proposal consists in recognizing geometrical features of QR code using a binary large object- (BLOB-) based algorithm with subsequent iterative filtering QR symbol position detection patterns that do not require complex processing and training of classifiers frequently used for these purposes. The high precision and speed are achieved by adaptive threshold binarization of integral images. In contrast to well-known scanners, which fail to detect QR code with medium to strong blurring, significant nonuniform illumination, considerable symbol deformations, and noising, the proposed technique provides high recognition rate of 80%–100% with a speed compatible to real-time applications. In particular, speed varies from 200 ms to 800 ms per single or multiple QR code detected simultaneously in images with resolution from 640 × 480 to 4080 × 2720, respectively.

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Microbial Brazil nut effect

Soft Matter ◽

10.1039/d1sm01327k ◽

2021 ◽

Author(s):

Atul Srivastava ◽

Kenji Kikuchi ◽

Takuji Ishikawa

Keyword(s):

Granular Medium ◽

Brazil Nut ◽

Large Object ◽

Intuitive Process ◽

Brazil Nut Effect

The Brazil nut effect (BNE) is a counter-intuitive process of segregation of a large object inside a vibrated granular medium (GM), which has been studied widely by subjecting GMs to...

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MINIMIZING THE EFFECTIVE AREA OF SCATTERING BY MEANS OF CHANGING THE RELATIVE MAGNETIC PERMEABILITY

ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА ◽

10.36622/vstu.2021.17.1.013 ◽

2021 ◽

pp. 85-88

Author(s):

А.В. Володько ◽

С.М. Фёдоров ◽

Е.А. Ищенко ◽

М.А. Сиваш ◽

Л.В. Сопина ◽

...

Keyword(s):

Magnetic Permeability ◽

Dielectric Material ◽

Threshold Value ◽

Effective Area ◽

Large Object ◽

Frequency Dependent ◽

Relative Magnetic Permeability ◽

Effective Scattering Area ◽

Maximum Value ◽

Simulation Results

Исследуется зависимость эффективной площади рассеяния (ЭПР) от относительной магнитной проницаемости материала, из которого изготавливается структура. В качестве тела моделирования был выбран шар, который изготовлен из диэлектрического материала, у которого возможно выполнять изменение относительной магнитной проницаемости. По полученным результатам моделирования построены графики зависимости максимального значения моностатической ЭПР от частоты, а также от относительной магнитной проницаемости среды. Было показано, что с увеличением относительной магнитной проницаемости материала изготовления происходит увеличение значения ЭПР объекта, а также обнаружена зависимость эффективной площади рассеяния от соотношения размеров шара и длиной волны, так при превышении порогового значения, после которого шар становится крупным объектом, ЭПР резко возрастает. По результатам исследования был построен график зависимости эффективной площади рассеяния шара от относительной магнитной проницаемости материала изготовления. Доказана возможность применения материала с частотозависимой относительной магнитной проницаемостью в качестве стелс-покрытия. В статье содержится исследуемая модель, графики полученных результатов, по которым можно легко определить зависимость ЭПР от частоты и от относительной магнитной проницаемости материала изготовления The article investigates the dependence of the effective scattering area (ESA) on the relative magnetic permeability of the material from which the structure is made. We chose a sphere as the modeling body, which is made of a dielectric material, in which it is possible to change the relative magnetic permeability. Based on the obtained simulation results, graphs of the dependence of the maximum value of monostatic ESA on frequency, as well as on the relative magnetic permeability of the medium, were constructed. It was shown that with an increase in the relative magnetic permeability of the material of manufacture, an increase in the value of the ESA of the object occurs, and the dependence of the effective scattering area on the ratio of the size of the ball and the wavelength was found, so when the threshold value is exceeded, after which the ball becomes a large object, ESA rises sharply. Based on the results of the study, a graph of the dependence of the effective scattering area of the sphere on the relative magnetic permeability of the material of manufacture was built. The possibility of using a material with a frequency-dependent relative magnetic permeability as a stealth coating was proven. The article contains the investigated model, graphs of the results obtained, by which it is easy to determine the dependence of the ESA on the frequency and on the relative magnetic permeability of the material of manufacture

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Body Size as Implied Threat: Effects on Personal Space and Person Perception

Perceptual and Motor Skills ◽

10.2466/pms.1976.43.1.223 ◽

1976 ◽

Vol 43 (1) ◽

pp. 223-230 ◽

Cited By ~ 5

Author(s):

Kent G. Bailey ◽

James V. Caffrey ◽

John J. Hartnett

Keyword(s):

Body Size ◽

Person Perception ◽

Personal Space ◽

Small Object ◽

Large Object ◽

Treatment Groups ◽

The Subject ◽

Psychological Advantage

Following ethological theory, it was hypothesized that personal space and person perception would reflect implied threat in the form of “territorial sets” and body-size variables. 90 male undergraduates were randomly assigned to six treatment groups in a 2 (size of object person) × 3 (levels of threat) × 2 (approach or be approached) design. Personal space was not significantly influenced by the treatments, but strong findings emerged from the person perception data. An operational measure of “psychological advantage” based on ratings of the object minus self-ratings on aggression, strength, and muscularity showed both body-size and threat effects. Generally, the large object person increased his advantage over the subject as threat increased, while the opposite was true with respect to the small object person.

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