Research on Sugarcane Seed-Bud Location Based on Anisotropic Scaling Transformation

2021 ◽  
Vol 37 (6) ◽  
pp. 1119-1130
Author(s):  
Fukuan Wang ◽  
Qi Liu ◽  
Meizhang Huang ◽  
Xi Qiao ◽  
Yiqi Huang

Highlights A method of locating sugarcane seed bud based on anisotropy transformation is proposed.Using computer binocular vision technology, the location of the sugarcane seed bud was determined by edge feature matching of the sugarcane seed bud.There are few methods to study the automatic location of sugarcane seed buds, and our research provides a new research idea.Abstract. Sugarcane is a major economic crop in China, but the degree of mechanization in sugarcane cultivation is low. To improve the economic benefit of sugarcane planting, promoting the use of mechanization in sugarcane planting is necessary. Currently, the sugarcane planted using mechanization has a low survival rate and the mechanization efficiency is low because the existing sugarcane precutting machine fails to address the problem of damaging seed buds. This study proposed a sugarcane bud localization method based on computer binocular vision technology. The sugarcane stem segment positions can be determined by the grayscale horizontal projection after preprocessing the sugarcane image based on color and grayscale features. Then, the bud area can be intercepted according to the positional relationship between the seed bud and the stem node, and the planar position of the seed bud will be determined by using the color space conversion and the gray vertical projection. Finally, the anisotropic scaling transformation is used to match the seed-bud area and restore the spatial coordinates of the seed bud, and the spatial position of the seed bud can be determined. The image pyramid acceleration matching process is adopted, which can make the method more suitable for real-time applications. The experimental results show that the accuracy of seed-bud matching based on the anisotropic scaling transformation is 98%, which provides a basis for research on the anti-injury germ system in the automatic planting process of sugarcane. Keywords: Anisotropic scaling, Binocular vision, Image pyramid, Mechanization planting of sugarcane, Seed bud location.

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
J Jouan ◽  
I Masari ◽  
V Bliah ◽  
G Soulat ◽  
D Craiem ◽  
...  

Abstract Introduction In order to improve knowledge of the tricuspid valve (TV) function and its coupling with the right atrio-ventricular junction (RAVJ) and right ventricle (RV), new four-dimensional high-definition imagery methods are mandatory (3D+t). Purpose Using an innovative reconstruction method based on multiphase cardiac computed tomography imaging (4D-MCCTI), we finely analyzed the morphological & dynamical features of tricuspid annulus (TA) and RAVJ components in order to assess new functional parameters of TV and RV functions. Methods Volume imaging data sets through time were obtained from 4D-MCCTI of 30 subjects (sex ratio 1, mean age 57±11y.) with no rhythm, valvular or ventricular abnormalities on echocardiography and implemented in a custom software for 3D semi-automated delineation of 18 points around TA perimeter. Coordinates of these points in each of the 10 time-phases within an RR interval were used to calculate specific geometrical features of TA such as 3D/2D areas, perimeters, 360°-diameters and vertical deformation. Subsequently, RV and Right Atrium (RA) inner contours were also delineated (Figure). Results TA shape was elliptical in horizontal projection with a mean eccentricity index (EcI) of 0.58±0.12; and saddle-shapped in vertical projection with a horn nearby the antero-septal commissure. This feature remained throughout the cardiac cycle but TA was more planar (minimal TA-height: 4.47±1.04 mm) and circular (minimal EcI=0.44±0.14) in mid-diastole when TA-3Darea and TA-3Dperimeter reached a maximum of 6.98±1.21 cm2/m2 and 7.41±0.91 cm, respectively. Correlation between TA-3Darea, TA-2Darea and latero-septal diameter (LSD) were R2=0.99 and R2=0.73, respectively. LSD was minimal in early-systole (18.83±3.04 mm/m2) and maximal in mid-diastole (20.04±3.05 mm/m2). Correlation of TA-3Darea with RV and RA cross-sectional areas were R2=0.82 and R2=0.71, respectively. Conversely, there was no significant correlation between TA, RV and RA concentric contractions. Conclusions Our method for 4D-MTCCI analysis has allowed confirming the shape and dynamics function of RAVJ throughout the cardiac cycle in healthy subjects, and giving new reference parameters for TV and RV evaluation. Software multiplanar view of TA Funding Acknowledgement Type of funding source: None


2012 ◽  
Vol 220-223 ◽  
pp. 1356-1361
Author(s):  
Xi Jie Tian ◽  
Jing Yu ◽  
Chang Chun Li

In this paper, the idea identify the hook on investment casting shell line based on machine vision has been proposed. According to the characteristic of the hook, we do the image acquisition and preprocessing, we adopt Hough transform to narrow the target range, and find the target area based on the method combining the level projection and vertical projection, use feature matching method SIFT to do the image matching. Finally, we get the space information of the target area of the hook.


2021 ◽  
Vol 2021 (3) ◽  
pp. 108-1-108-14
Author(s):  
Eberhard Hasche ◽  
Oliver Karaschewski ◽  
Reiner Creutzburg

In modern moving image production pipelines, it is unavoidable to move the footage through different color spaces. Unfortunately, these color spaces exhibit color gamuts of various sizes. The most common problem is converting the cameras’ widegamut color spaces to the smaller gamuts of the display devices (cinema projector, broadcast monitor, computer display). So it is necessary to scale down the scene-referred footage to the gamut of the display using tone mapping functions [34].In a cinema production pipeline, ACES is widely used as the predominant color system. The all-color compassing ACES AP0 primaries are defined inside the system in a general way. However, when implementing visual effects and performing a color grade, the more usable ACES AP1 primaries are in use. When recording highly saturated bright colors, color values are often outside the target color space. This results in negative color values, which are hard to address inside a color pipeline. "Users of ACES are experiencing problems with clipping of colors and the resulting artifacts (loss of texture, intensification of color fringes). This clipping occurs at two stages in the pipeline: <list list-type="simple"> <list-item>- Conversion from camera raw RGB or from the manufacturer’s encoding space into ACES AP0</list-item> <list-item>- Conversion from ACES AP0 into the working color space ACES AP1" [1]</list-item> </list>The ACES community established a Gamut Mapping Virtual Working Group (VWG) to address these problems. The group’s scope is to propose a suitable gamut mapping/compression algorithm. This algorithm should perform well with wide-gamut, high dynamic range, scene-referred content. Furthermore, it should also be robust and invertible. This paper tests the behavior of the published GamutCompressor when applied to in- and out-ofgamut imagery and provides suggestions for application implementation. The tests are executed in The Foundry’s Nuke [2].


2020 ◽  
Vol 36 (4) ◽  
pp. 557-564
Author(s):  
LingHan Cai ◽  
Yuan Zhao ◽  
Zhuojue Huang ◽  
Yang Gao ◽  
Han Li ◽  
...  

Highlights This article calculates the canopy coverage (Cc) and inverts it to the leaf area index (LAI) of the collected images through a portable device such as a mobile phone, which is convenient for researchers. The Lab color model has been used for plant area extraction, which has achieved good results. Steps such as weed removal make the algorithm more universal. The inversion results of LAI based on canopy coverage has high accuracy, which indicates that it can be used for LAI calculation. Abstract . Canopy coverage (Cc) and leaf area index (LAI) are important parameters for qualitative and quantitative descriptions of plant growth trends. Meanwhile, LAI can be reflected by Cc. Therefore, it is of great significance to observe Cc and establish the relationship between Cc and LAI for monitoring the growth of plants. In July 2019, in Shang Zhuang experimental field of China Agricultural University, 30 potato canopy images were taken vertically by camera, and the actual LAI data of the corresponding images were measured and recorded by LAI-2200C. Image extraction algorithms of different models, such as ExG, ExGR, NDIGR, and Lab color space extraction model are evaluated and compared. After that, estimating the parameters of the logarithmic model of LAI-Cc by minimizing errors, evaluating the inversion model by Hold-Out. Besides, the result shows Cc can be calculated efficiently by using Lab color space extraction model. In the training set, the average value of R2 between the predicted LAI and the actual LAI reaches 0.940, and the RMSE reaches 0.144. In the test set, the average value of R2 reaches 0.937, the RMSE reaches 0.197. And the average time consumption of the entire process is 2.989 s on an image. It suggests that the study can provide a basis for dynamic monitoring of potato and other crops. Keywords: Canopy coverage (Cc), Leaf area index (LAI), Image processing, Potato, Rapid measurement.


2020 ◽  
Vol 36 (4) ◽  
pp. 557-564
Author(s):  
LingHan Cai ◽  
Yuan Zhao ◽  
Zhuojue Huang ◽  
Yang Gao ◽  
Han Li ◽  
...  

Highlights This article calculates the canopy coverage (Cc) and inverts it to the leaf area index (LAI) of the collected images through a portable device such as a mobile phone, which is convenient for researchers. The Lab color model has been used for plant area extraction, which has achieved good results. Steps such as weed removal make the algorithm more universal. The inversion results of LAI based on canopy coverage has high accuracy, which indicates that it can be used for LAI calculation. Abstract . Canopy coverage (Cc) and leaf area index (LAI) are important parameters for qualitative and quantitative descriptions of plant growth trends. Meanwhile, LAI can be reflected by Cc. Therefore, it is of great significance to observe Cc and establish the relationship between Cc and LAI for monitoring the growth of plants. In July 2019, in Shang Zhuang experimental field of China Agricultural University, 30 potato canopy images were taken vertically by camera, and the actual LAI data of the corresponding images were measured and recorded by LAI-2200C. Image extraction algorithms of different models, such as ExG, ExGR, NDIGR, and Lab color space extraction model are evaluated and compared. After that, estimating the parameters of the logarithmic model of LAI-Cc by minimizing errors, evaluating the inversion model by Hold-Out. Besides, the result shows Cc can be calculated efficiently by using Lab color space extraction model. In the training set, the average value of R2 between the predicted LAI and the actual LAI reaches 0.940, and the RMSE reaches 0.144. In the test set, the average value of R2 reaches 0.937, the RMSE reaches 0.197. And the average time consumption of the entire process is 2.989 s on an image. It suggests that the study can provide a basis for dynamic monitoring of potato and other crops. Keywords: Canopy coverage (Cc), Leaf area index (LAI), Image processing, Potato, Rapid measurement.


2019 ◽  
Author(s):  
Stephanie Long ◽  
Tibor Schuster ◽  
Russell Steele ◽  
Suzanne Leclerc ◽  
Ian Shrier

AbstractBackgroundTests of binocular vision (BVTs) and ocular motility are used in concussion assessment and management.PurposeTo determine the one-week test-retest reliability of 9 binocular vision tests (BVTs) and a test of saccades proposed for use in concussion management.Study DesignProspective test-retest.MethodsWe examined the one-week test-retest reliability of 9 BVTs in healthy participants: 3D vision (gross stereoscopic acuity), phoria at 30cm and 3m, ability of eyes to move/fixate in-sync (positive and negative fusional vergence at 30cm and 3m, near point of convergence and near point of convergence – break [i.e. double vision]) and 1 ocular motor test, saccades.ResultsWe tested 10 males and 10 females without concussion and a mean age of 25.5 (4.1) years. The intraclass correlations suggest good reliability for phoria 3m (0.88) and gross stereoscopic acuity (0.86), and moderate reliability for phoria 30cm (0.69), near point of convergence (0.54), positive fusional vergence (0.54) and negative fusional vergence (0.66) at 30cm, and near point of convergence - break (0.64). There was poor reliability for saccades (0.34), and both positive and negative fusional vergence (0.49 and 0.43, respectively) at 3m. Limits of agreement (LoA) were best for saccade (±34%) and worst for phoria 30 cm (±121%) and ranged from ±58% to ±70% for 7 of the 8 other tests. The LoA for phoria at 3m were uninformative because measurements for 18 of 20 participants were identical.ConclusionWe found test-retest reliability of the BVTs and saccades ranging from poor to good in healthy participants, with the majority being moderate.Clinical RelevanceFor these vision tests to be clinically useful, the effect of concussion must have a moderate to large effect on the scores of most of the tests.What is known about the subjectConcussions may affect some parts of visual function1-week test-retest reliability for most visual tests is under-studiedWhat this study adds to existing knowledgeWe provide intra-class coefficients and limits of agreement for 10 different visual function tests commonly conducted by clinicians in patients with concussion.


2014 ◽  
Vol 602-605 ◽  
pp. 1299-1302
Author(s):  
Xiang Ping Meng ◽  
Lei Wang ◽  
Quan De Yuan ◽  
Xiu Ji

Landmark feature match method of robot visual navigation has been studied, An unsupervised learning methods based on binocular vision has been proposed to match Landmark feature fast. Firstly, environmental Information images are obtained by binocular vision, Then SIFT feature vectors are abstracted from binocular vision images, Lastly, Self-Organizing Map is pulled in to match multidimensional feature point fast by using competitive learning methods. Experiments showed that the proposed methods on feature matching with better computation time and effect than the traditional SIFT and SURF of feature matching methods. And it can satisfied the requirement of real-time.


2011 ◽  
Vol 175-176 ◽  
pp. 366-370
Author(s):  
Jian Zhou ◽  
Hong Gang Bu ◽  
Jun Wang

A new feature extraction method for fabric defect detection is proposed, which is based on one-dimensional projection series of fabric images. By using horizontal projection and vertical projection of the image, the characteristics of periodicity and orientation of fabric texture can be fully utilized. In terms of detection defects, it helps acquire information at most, and the computational complexity can also be greatly decreased with one-dimensional projection series. The proposed new method, named Auto-Regressive spectral analysis (AR), is a kind of modern spectral analysis method which is very suitable for analyzing short data with a high spectral resolution. The Burg algorithm is applied to estimate the AR spectrum. Finally, t-test is applied to verify the effectiveness of AR spectral features. This approach has been applied to various cases of defect detections with satisfactory results.


2020 ◽  
Vol 19 (19) ◽  
pp. 189-205
Author(s):  
Нanna Savchenko

Background. The issue of time in Igor Stravinsky’s works attracts the attention of researchers constantly. The time is studied through revealing the meter and rhythm specifics of the works (the concept of irregular-accent rhythm (a term of V. Kholopova). In our opinion, in the study of the temporal and spatial parameter another reversal is possible – in the aspect of orchestration as a means of material and sound objectification of a composer’s conception in time and space. Taking into account the evolution of I. Stravinsky’s composer thinking, this approach allows us to demonstrate those changes that took place in the orchestration of the composer, and to reveal certain constants, universals (S. Savenko) of orchestral thinking and orchestration as a set of technological methods. Analysis of recent research and publications. The theme of time and its specificity in Igor Stravinsky’s works is studied discreetly in the monograph by S. Savenko (2001), which discusses it in connection with the study of meter and rhythm, motif technique, musical form. The notion of space is not a scientific problem in the monograph, but the author discusses it in relation to texture and orchestration. The separate sections of the monograph by M. Druskin (1982) are devoted to the issues of time (Motion) and space (Space). In the first one, the musicologist emphasizes the importance of the visual images and body movements for the composer. The author distinguishes two approaches of I. Stravinsky to the course of time: the first approach evenly regulates it, the second one constantly violates it, because it is full of emotions and psychic states (Druskin, 1982: 135). In the section Space, M. Druskin (1982: 140–141) emphasizes the composer’s intended attitude to the issue of space organization, in which he continues the discovery by Claude Debussy. The essence of innovation lies in the creation of a multicenter composition that involves the coexistence of many points of view (1982: 143–150). O. Sokol (1974) also discusses the above concept of time but in order to substantiate the principle of similarity in the creative method of the composer. A special study on the issue of rhythm and time in I. Stravinsky’s works is the doctoral dissertation by A. Makina (2010). The analysis of the rhythmic and temporal structures and the rhythmic technique of the Symphony of Wind Instruments allows the author to conclude that “Stravinsky’s innovation is to strengthen the structural rhythmic component of the composition as an alternative to tonal development...” (Makina, 2010: 12). Objectives of the researching. In the above works, the orchestration by I. Stravinsky as a system of technological methods of organizing material in time and space does not become a subject of special study. Therefore, the aim of this article is to study the specifics of the spatial and temporal organization of I. Stravinsky’s composition as exemplified by the work of his neoclassical period (the ballet Apollon Musag&#232;te) in the aspect of orchestral composing. Discussion and results. In the early works, I. Stravinsky develops the orchestral technique of composing based on the multi-figure principle. It allowed the composer to embody in his artistic system new ideas about time and space according to the worldview, which has changed dramatically in the modern culture. The figure in the orchestral texture means, as we define it, a formula that is delineated with intonational, rhythmic, texture, register, and timbre means, or with a set of means outlined in a plastic-characteristic, visual way. It can be repeated accurately (ostinato) or alternatively. The multifigure technique in horizontal projection is realized at microand macro-syntactic levels. In the organization of time, it generates increased eventfulness, semantic density. In vertical projection, the multifigure technique is manifested in the combination of different figures in a polysyllable texture organized on the principle of complementarity. This enriches the orchestral texture with spaciousness. The preservation of the multifigure technique as a constant of I. Stravinsky’s composer thinking comes from the peculiarities of his style system. The style of the composer, according to many researchers, is based on the dialectical interaction of universal (stable) and variant (mobile) aspects at different levels of stylistic integrity. The orchestration parameter contains new “neoclassical” qualities and stable orchestra composing techniques (the multifigure technique). Let us turn to the ballet Apollon Musag&#232;te (1928). The selected composition of the orchestra is expressly “classical”: the string orchestra forms a timbre-soldered organism, devoid of the bright color of woodwind and brass instruments. The result is a monochrome sound, essentially continuous, because it does not change its timbre throughout the ballet. In the works of the neoclassical period, the composer reproduces certain qualities of the model (Savenko, 1977). We assume that purposeful continuous time and homogeneous space are also subject to simulation. A powerful means of modeling continuous time is the “long” melody that the composer designs. Its unfolding in the context of timbre monochromaticism really creates an auditory illusion of a timeless expression that goes on in time. However, a visual analysis of the score testifies to the effect of the multifigure technique, which imparts a process of discreteness. The figures help break the melody line, register contrasts, timbre interception. Vertically, based on the figure composing, counterpoints and duplications (usually inaccurate) are built, which violates the homogeneity of the space and gives it a variable density. Conclusions. The analysis of the scores of the ballet Apollon Musag&#232;te has shown the effect of the constant principle of multifigure technique. The multifigure technique undergoes modifications, as it interacts with the techniques that matured in the neoclassical period (“long” melody, monochrome timbre), and it aimed at modeling the “classical” directed continuous time and homogeneous space. As a result, the multifigure technique breaks the continuity of time by giving it discreteness; creates an inhomogeneous space. The author sees the prospects of the study in the analysis of opera scores, in which the multifigure technique comes in the complex interaction with the words.


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