scholarly journals Semi-Automatic Spectral Image Stitching for a Compact Hybrid Linescan Hyperspectral Camera towards Near Field Remote Monitoring of Potato Crop Leaves

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7616
Author(s):  
Pierre Chatelain ◽  
Gilles Delmaire ◽  
Ahed Alboody ◽  
Matthieu Puigt ◽  
Gilles Roussel
Keyword(s):  
Remote Monitoring ◽  
Potato Crop ◽  
Near Field ◽  
Reference Points ◽  
Experimental Comparison ◽  
Second Step ◽  
Image Stitching ◽  
Potato Leaf ◽  
Spectral Image ◽  
Step Procedure

The miniaturization of hyperspectral cameras has opened a new path to capture spectral information. One such camera, called the hybrid linescan camera, requires accurate control of its movement. Contrary to classical linescan cameras, where one line is available for every band in one shot, the latter asks for multiple shots to fill a line with multiple bands. Unfortunately, the reconstruction is corrupted by a parallax effect, which affects each band differently. In this article, we propose a two-step procedure, which first reconstructs an approximate datacube in two different ways, and second, performs a corrective warping on each band based on a multiple homography framework. The second step combines different stitching methods to perform this reconstruction. A complete synthetic and experimental comparison is performed by using geometric indicators of reference points. It appears throughout the course of our experimentation that misalignment is significantly reduced but remains non-negligible at the potato leaf scale.

CLASSIFICATION OF HIGH-DIMENSIONAL MICROARRAY DATA WITH A TWO-STEP PROCEDURE VIA A WILCOXON CRITERION AND MULTILAYER PERCEPTRON

2011 ◽  
Vol 10 (01) ◽  
pp. 1-14
Author(s):  
VLADIMIR NIKULIN ◽  
TIAN-HSIANG HUANG ◽  
GEOFFREY J. MCLACHLAN
Keyword(s):  
Data Mining ◽  
Feature Selection ◽  
High Dimensional ◽  
Second Step ◽  
Support Vector ◽  
Step Procedure ◽  
Leave One Out ◽  
Natural Combination ◽  
Feature Selection Techniques

The method presented in this paper is novel as a natural combination of two mutually dependent steps. Feature selection is a key element (first step) in our classification system, which was employed during the 2010 International RSCTC data mining (bioinformatics) Challenge. The second step may be implemented using any suitable classifier such as linear regression, support vector machine or neural networks. We conducted leave-one-out (LOO) experiments with several feature selection techniques and classifiers. Based on the LOO evaluations, we decided to use feature selection with the separation type Wilcoxon-based criterion for all final submissions. The method presented in this paper was tested successfully during the RSCTC data mining Challenge, where we achieved the top score in the Basic track.

scholarly journals Impact of elevated temperature scenarios on potato leaf development

2012 ◽  
Vol 32 (4) ◽  
pp. 689-697 ◽  
Author(s):  
Nereu A. Streck ◽  
Lilian O. Uhlmann ◽  
Alencar J. Zanon ◽  
Dilson A. Bisognin
Keyword(s):  
Elevated Temperature ◽  
Leaf Development ◽  
Potato Crop ◽  
Temperature Response ◽  
Potato Leaf ◽  
Linear Temperature ◽  
Growing Seasons ◽  
Randomized Design ◽  
Leaf Appearance ◽  
The Impact

The objective of this study was to simulate the impact of elevated temperature scenarios on leaf development of potato in Santa Maria, RS, Brazil. Leaf appearance was estimated using a multiplicative model that has a non-linear temperature response function which calculates the daily leaf appearance rate (LAR, leaves day-1) and the accumulated number of leaves (LN) from crop emergence to the appearance of the upper last leaf. Leaf appearance was estimated during 100 years in the following scenarios: current climate, +1 °C, +2 °C, +3 °C, +4 °C e +5 °C. The LAR model was estimated with coefficients of the Asterix cultivar in five emergence dates and in two growing seasons (Fall and Spring). Variable of interest was the duration (days) of the crop emergence to the appearance of the final leaf number (EM-FLN) phase. Statistical analysis was performed assuming a three-factorial experiment, with main effects being climate scenarios, growing seasons, and emergence dates in a completely randomized design using years (one hundred) as replications. The results showed that warmer scenarios lead to an increase, in the fall, and a decrease, in the spring growing season, in the duration of the leaf appearance phase, indicating high vulnerability and complexity of the response of potato crop grown in a Subtropical environment to climate change.

scholarly journals Assessment of Phytotoxic Potential of Potato Genotypes

2017 ◽  
Vol 75 (1) ◽  
pp. 17-22
Author(s):  
Dorota Sołtys-Kalina
Keyword(s):  
Correlation Coefficient ◽  
Negative Impact ◽  
Biologically Active ◽  
Test Plant ◽  
Laboratory Studies ◽  
Leaf Extracts ◽  
Potato Leaf ◽  
Active Compounds ◽  
Step Procedure ◽  
Total Glycoalkaloids

Abstract In the laboratory studies on allelopathy, phytotoxicity is defined as a negative impact of plant’s extracts or natural compounds derived from plants, on germination and/or growth of the tested (acceptor) plant. Glycoalkaloids are the main biologically active compounds of the potato and are involved in potato phytotoxicity (the correlation coefficient of the length of the test plant with the concentration of total glycoalkaloids present in the leaf extracts of forty potato genotypes was r = -0.41). The assessment of phytotoxic abilities of the potato is a two-step procedure which consists of determining glycoalkaloids in potato leaf extracts and analyzing the root and hypocotyl lengths of the test plant growing in potato leaf extracts.

scholarly journals The Nature of Compounding

2021 ◽  
Vol 2 (1) ◽  
pp. 01-21
Author(s):  
Pius ten Hacken
Keyword(s):  
Second Step ◽  
Linguistic Terms ◽  
Scientific Terminology ◽  
Step Procedure ◽  
To Come ◽  
Universal Definition ◽  
Definition Of ◽  
Selection Of

This paper addresses the question of the definition of compounding from a terminological perspective. In terminology, concepts are defined by a selection of properties shared by prototypical cases. For scientific terminology, the selection is validated by the strength of the theories that can use the definition. It is shown that morphophonological criteria often adduced in the delimitation of compounding are not adequate in a universal definition. In order to come up with a better definition, a two-step procedure is proposed. In the first step, a universal definition is used to determine for constructions in a particular language whether they belong to compounding. In the second step, language-specific properties are used to identify instances of these constructions. A definition is proposed that takes a compound as a word with a binary, headed structure, a relation between the elements that is not determined by compounding and a non-head that is not introduced as an entity in the discourse. The use of this definition is illustrated with a number of constructions in different languages. It is shown that expressions commonly called exocentric and copulative compounds are generally not compounds in this definition, but that some expressions that have been labelled as such are in fact compounds. The two-step procedure demonstrated here for compounding can also be used for other linguistic terms.

Immobilization of enzymes on alumina by means of pyridoxal 5′-phosphate

1988 ◽  
Vol 8 (3) ◽  
pp. 263-269 ◽  
Author(s):  
M. Pugnière ◽  
C. San Juan ◽  
M-A. Coletti-Previero ◽  
A. Previero
Keyword(s):  
Molecular Weight ◽  
Physical Properties ◽  
High Activity ◽  
Immobilized Enzymes ◽  
Second Step ◽  
Low Molecular Weight ◽  
Step Procedure ◽  
Immobilization Of Enzymes

A number of proteases have been immobilized on alumina in a two-step procedure: the first step converted them into semisynthetic phosphoproteins which, in the second step, spontaneously bonded to alumina through their phosphate function. The immobilized enzymes thus obtained showed the physical properties typical of the inorganic carrier and a high activity on low molecular weight substrates.

Simple model designed to generate new crystal structures derived from a mother phase; application to molecular compounds

2002 ◽  
Vol 58 (4) ◽  
pp. 662-672 ◽  
Author(s):  
Claire Gervais ◽  
Gérard Coquerel
Keyword(s):  
Crystal Structure ◽  
Simple Model ◽  
Three Dimensional ◽  
Second Step ◽  
Two Dimensional ◽  
Basic Principles ◽  
Space Groups ◽  
Step Procedure ◽  
Symmetry Operators ◽  
Molecular Compounds

The basic principles of a model predicting new lattices from a known crystal structure are described. The first of the two-step procedure consists of extracting one- or two-dimensional periodic fragments (PF) from the mother structure. In the second step, symmetry operators are added to the PFs in order to generate one or several new three-dimensional lattices consistent with the 230 space groups. Most of the examples are related to polymorphism, but relationships between racemic compounds and enantiomers, twinning and lamellar epitaxy phenomena are also exemplified.

A Model for Assessing the Shape of Solder Joints in the Presence of PCB and Package Warpage

2005 ◽  
Vol 128 (3) ◽  
pp. 184-191 ◽  
Author(s):  
Mahidhar Rayasam ◽  
Terrace B. Thompson ◽  
Ganesh Subbarayan ◽  
C. Gurumurthy ◽  
J. R. Wilcox
Keyword(s):  
Solder Joints ◽  
Equilibrium Configuration ◽  
Circuit Board ◽  
Second Step ◽  
Computationally Efficient ◽  
Test Vehicle ◽  
Step Procedure ◽  
Solder Volume ◽  
Restoring Forces ◽  
Material Volume

Our goals in this paper are to develop and demonstrate a computationally efficient methodology for assessing the effect of circuit board warpage, component warpage, and solder volume variation on the shape of the solder joints in area array packages. The effect of warpage is analyzed using a two-step procedure in the present paper. In the first step, the restoring forces and moments (in the molten state of solder droplet) that result from a given solder joint height, solder material volume, pad diameter, and pad inclination are predicted using the surface tension theory. In the second step of the analysis, the forces and moments at individual solder joints caused by varying solder heights and pad tilts are combined to predict the equilibrium configuration of the package. A program written in the MATHEMATICA® environment was developed to implement the above-described methodology. The developed procedure was validated on an experimental test vehicle with nine solder joints. The heights of solder joints computed by the program matched the experimentally measured heights to within ±5% error. Further, the general capabilities of the modeling procedure are demonstrated by assuming complex combinations of package and PCB warpage.

Double incision and snare resection in symptomatic Zenker’s diverticulum: a modification of the stag beetle knife technique

Endoscopy ◽  
2017 ◽  
Vol 50 (02) ◽  
pp. 137-141 ◽  
Author(s):  
Stefan Gölder ◽  
Juliane Brueckner ◽  
Alanna Ebigbo ◽  
Helmut Messmann
Keyword(s):  
Endoscopic Treatment ◽  
Second Step ◽  
Zenker’S Diverticulum ◽  
Treatment Technique ◽  
Oral Nutrition ◽  
Cricopharyngeal Muscle ◽  
Zenker's Diverticulum ◽  
Step Procedure ◽  
A New Technique

Abstract Background and study aim Relief from dysphagia and regurgitation are the main goals of therapy in symptomatic Zenker’s diverticulum. Flexible endoscopic treatment has proved to be an effective and safe method in control of these symptoms. The aim of our study was to further improve the resection of the cricopharyngeal muscle using a new technique, the double incision and snare resection (DISR) procedure, to reduce the recurrence rate. Patients and methods From February 2016 to April 2017, 16 patients were treated with 18 DISR procedures at our institution. The symptoms of the patients were recorded by a seven-item questionnaire prior to treatment, and re-evaluation was scheduled at 1 and 6 months after treatment. Results The median age was 70 years (range 55 – 85), and 10 patients were men (62 %). The median size of the diverticulum was 20 mm (range 5 – 40 mm), and the DISR procedure was performed in 28 minutes (range 20 – 47 minutes), with no major postinterventional complications. All patients re-started oral nutrition on the day after the intervention; a gastric tube was not required. The median follow-up was 3 months (range 1 – 15 months). Two patients received a planned second-step procedure, one because of a very large cricopharyngeal muscle and one because of a cyst inside the Zenker’s bridge. Although one patient suffered from mild recurrence of symptoms, she refused a second treatment. All other patients were free of symptoms after treatment. Conclusions The DISR procedure is a new endoscopic treatment technique that safely and reproducibly offers relief from symptomatic Zenker’s diverticulum.

Topology Optimization of Contact-Aided Compliant Cellular Mechanisms

2009 ◽  
Author(s):  
Vipul Mehta ◽  
Mary Frecker ◽  
George A. Lesieutre
Keyword(s):  
Topology Optimization ◽  
Contact Structure ◽  
Compliant Mechanism ◽  
Local Strain ◽  
Homogenization Method ◽  
Second Step ◽  
Cellular Mechanisms ◽  
Step Procedure ◽  
Contact Mechanism ◽  
The Continuum

Applications of topology optimization to design compliant cellular mechanisms with and without a contact mechanism are presented in this paper. A two-step procedure is developed. For cellular structures without contact, the inverse homogenization method is employed using ‘Solid Isotropic Material with Penalization’ approach. The compliant mechanism is optimized to yield prescribed elasticity coefficients. The structure is also required to undergo a large overall strain without exceeding the allowable local strain. Results including a honeycomb similar structure and a negative Poisson’s ratio structure are presented. To implement a contact mechanism in the second step, the continuum model of a non-contact structure is converted into a frame model. Such a model is investigated for a contact pair which would reduce the maximum local strain. The scheme demonstrates that stress relief can be obtained.

scholarly journals An accurate fingerprint reference point determination method based on curvature estimation of separated ridges

2018 ◽  
Vol 28 (1) ◽  
pp. 209-225 ◽  
Author(s):  
Rafal Doroz ◽  
Krzysztof Wrobel ◽  
Piotr Porwik
Keyword(s):  
Reference Point ◽  
Reference Points ◽  
Second Step ◽  
Multi Stage ◽  
Stage System ◽  
Series Of Experiments ◽  
Curvature Estimation ◽  
Point Determination ◽  
Point Detection

AbstractThis paper presents an effective method for the detection of a fingerprint’s reference point by analyzing fingerprint ridges’ curvatures. The proposed approach is a multi-stage system. The first step extracts the fingerprint ridges from an image and transforms them into chains of discrete points. In the second step, the obtained chains of points are processed by a dedicated algorithm to detect corners and other points of highest curvature on their planar surface. In a series of experiments we demonstrate that the proposed method based on this algorithm allows effective determination of fingerprint reference points. Furthermore, the proposed method is relatively simple and achieves better results when compared with the approaches known from the literature. The reference point detection experiments were conducted using publicly available fingerprint databases FVC2000, FVC2002, FVC2004 and NIST

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