نتایج جستجو برای: random vortex blob

تعداد نتایج: 311968  

Journal: :Agronomy 2022

The paper presents a pumpkin yield estimation method using images acquired by UAV. processing pipeline is fully automated. It consists of orthomosaic generation, color model collection random subset the data, segmentation, and finally counting blobs together with assessing number pumpkins in each blob. algorithm was validated manual check 5% tested dataset. precision value ranges between 0.959 ...

Direct numerical simulation of turbulent flow behind a cylinder, wake flow, using the random vortex method for an incompressible fluid in two dimensions is presented. In the random vortex method, the primary variable is vorticity of the flow field. After generation on the cylinder wall, it is followed in two fractional time step in a Lagrangian system of coordinates, namely convection and diffu...

2009

This toolbox implements a set of methodologies for detecting plankton specimens in cluttered images and recognizing their taxa. The functionalities of the developed system are divided into three major procedures [6]: 1) First, a novel image segmentation algorithm is applied to extract salient objects from a set of input cluttered images. The employed methodology, based on a novel nonparametric ...

1999
J. C. McWilliams J. B. Weiss I. Yavneh

A coherent-vortex analysis is made of a computational solution for the free decay of homogeneous, Charney-isotropic geostrophic turbulence at large Reynolds number. The method of analysis is a vortex detection and measurement algorithm that we call a vortex census. The census demonstrates how, through non-conservative interactions among closely approaching vortices, the vortex population evolve...

Journal: :Pattern recognition letters 2007
Hang Chang Qing Yang Bahram Parvin

Blob-like structures occur often in nature, where they aid in cueing and the pre-attentive process. These structures often overlap, form perceptual boundaries, and are heterogeneous in shape, size, and intensity. In this paper, voting, Voronoi tessellation, and level set methods are combined to delineate blob-like structures. Voting and subsequent Voronoi tessellation provide the initial condit...

Journal: :Visual neuroscience 1998
N H Yabuta E M Callaway

Pyramidal neurons in superficial layers of cerebral cortex have extensive horizontal axons that provide a substrate for lateral interactions across cortical columns. These connections are believed to link functionally similar regions, as suggested by the observation that cytochrome-oxidase blobs in the monkey primary visual cortex (V1) are preferentially connected to blobs and interblobs to int...

2000
Q. Li J. C. Brown

Results are presented on the expected variability of Wolf-Rayet (WR) stars in broad-band optical polarimetry and photometry, and in emission line profiles, due to an inhomogeneous random distribution of blobs in spherical geometry. Time dependent 3−D simulations are carried out with blob ejection random in time and direction, and the radiation properties are evaluated in the optically thin limi...

2012
David M. Birch

Trailing vortices have been repeatedly shown to exhibit a remarkably robust selfsimilarity independent of the Reynolds number and upstream boundary conditions. The collapse of the inner-scaled circulation profiles of a trailing vortex has even been previously demonstrated for the cases of highly unsteady and turbulent vortex systems, as well as for vortices which were incompletely developed. A ...

2010
José Carlos Castillo Juan Serrano-Cuerda Antonio Fernández-Caballero

In this paper, a new approach to real-time people segmentation through processing images captured by an infrared camera is introduced. The approach starts detecting human candidate blobs processed through traditional image thresholding techniques. Afterwards, the blobs are refined with the objective of validating the content of each blob. The question to be solved is if each blob contains one s...

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