S V M Based Hybrid Classification and Information Extraction from Hyperspectral Images for Precision Agriculture
Citation: S V M Based Hybrid Classification and Information Extraction from Hyperspectral Images for Precision Agriculture, American Research Journal of Electronics and Communications Engineering; Vol 1, no 1; pp: 1115.
Copyright This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract:
In the recent decades there is a lot of fear in natural resources than of manmade resources. Analysis and observation of Agricultural area, human living area/urban area and water bodies has become crucial. We need to know how much amount of land is used and how much amount of land is not used in global scale. There is a constant change in the geography of earth due to land erosion, biological and geo chemical cycling and biodiversity. As there is a constant change we need to know the land used and land not used. Knowing these shows a prominent role in global & social development of earth. There is a rapid change on the surface of the earth which has to be noticed and recorded. All these changes on the surface of the earth can be noticed by remote sensing. Remote sensing has become a vital means for observing changes, particularly as a means of completing or updating conventional data gathering techniques. [1] In the past few years people have gained knowledge about hyperspectral images and their importance in the field of remote sensing area. The basic meaning of “hyperspectral” means “hyper” = “over” that means “too many” which depicts the huge number of measured wave length bands and “spectralspectra” means relating to spectrum. This paper mainly describes the cοmputatiοnal way tο execute S V M and the other main highlight οf the paper is tο detect edges οf classified images and real time area estimatiοn οf agriculture area, human living area and water bοdies fοr all Hyperspectral images.
Keywοrds: Hyperspectral Images, Suppοrt Vectοr Machine, Hyƅrid Classificatiοn, Agriculture Area, Human Living Area, Water Ƅοdies, Edge Detectiοn, Area Estimatiοn.
Description:
INTRODUCTION
The latest apprehension of sustainable use of natural assets, monitoring and analysis of agriculture area, human living area and water bodies Analysis and observation of Agricultural area, human living area/urban area and water bodies has become crucial. We need to know how much amount of land is used and how much amount of land is not used in global scale. There is a constant change in the geography of earth due to land erosion, biological and geo chemical cycling and biodiversity. As there is a constant change we need to know the land used and land not used. Knowing these shows a prominent role in global & social development of earth. There is a rapid change on the surface of the earth which has to be noticed and recorded. All these changes on the surface of the earth can be noticed by remote sensing. Remote sensing has become a vital means for observing changes, particularly as a means of completing or updating conventional data gathering techniques.
SUPPΟRT VECTΟR MACHINE
Basically we take a hyperspectral image then we will remove noise which is also called as glitch in hyperspectral
images. Once the noise is removed using a low pass filter we then proceed with classification of images.
Image classification is done by S V M. In the current research Support Vector Machine was matched with other
classification approaches like, maximum likelihood and artificial neural networks classifiers for remote sensing
imagery and it has outdid all of the in toughness and precision. So we can say S V M is one of the best classifier
in the recent trends. [2][3]
Support Vector Machine has a greater prospective, mainly for hyperspectral samples, due to their great dimensionality. S V M based classification of hyperspectral image into agriculture area, human living area and water bodies.
IMPLEMENTATIΟN AND METHΟDLΟGY
Hyperspectral images act as the input images. Once we get the hyperspectral images, we need to preprocess those images to remove glitches and then classification is done based on the algorithm classed support vector machine.
Above figure shows the generalized block diagram of S V M based classification for hyperspectral images.
The hyper plane will be created in S V M to distinguish between the objects; these hyper planes will be created with the help of support vectors, and these support vectors will be created when there are different shades, texture, reflection and absorption in the given hyperspectral image. The support vectors have to be educated and theses educated /trained vectors classify the images, vectors quantities are those with have magnitude and direction. The S V M method pursues to locate ultimate setting apart hyper plane among instructions using aiming on education instances which might be positioned at the brink of the elegance elements. This education types are known as help “vectors”. The training cases other than support vectors will be rejected. This is how the process continues, now not most effective is a top rated hyper plane equipped, out additionally few training cases are effectively used; therefore high category precision is finished with small training sets. Pixel based schemes are used to find the support vectors and this is how we train the support vectors and using these support vectors we classify the images.
Now let us understand how the support vectors are calculated based on the images and how a hyper plane is used to decide the difference in the objects of the hyperspectral images. The execution of the primarily based image estimation is done, allowing us to understand how supervised binary classification is solved. Consider the trained cases are symbolized by [xi, yi] i = 1, 2, …, N, & yi ∈ [1, +1], in which N is the most important parameter that represents the number of trained cases, yi = +1 for class ω1 and yi = 1 for class ω2. Assume the two classes are linearly separable. The vector quantities w and w0, are used to decide the hyper plane which help in separating the different objects in the images. Now let’s take these vectors quantities with a function F(x), which is given in the equation 1 below.
F (x) = w * x + w0 = 0 [1]
Now we need to find the hyper plane, theses plane can found by w0 and w1, it is represented as yi ( w * xi + w0)≥ +1 for yi = +1 it’s for class ω1 and yi ( w * xi + w0) ≤ −1 for yi = 1 and this is for class ω2. The above equation can be joined together to form the equation 2.
yi ( w * xi + w0) – 1 ≥ 0 [2]
There may be many hyper planes that are separated based the training give to them, hyper planes may be many, like superior hyper plane can do the better classification. The main aim is to look for the hyper plane which leaves the extreme margin among the peers in an effort to get the uppermost worth hyperplane. The support vectors lie between two hyper planes which will be adjacent to the finest and it is given by the equation3.
W * xi + w0 = ± 1 [3]
If a simple/test cases are rescaled according to the hyper plane coefficients w and w0 takes place, the margin can be expressed as 2/W. The ideal hyper plane can be originated by explaining the next optimization equation 4.
Reducing/minimizing
The above equation is focus on yi
Using a Lagrangian formula, the above problematic case can be solved as:
which is subjected to
λi (lambda) is the Lagrange multipliers. There many such multiples given by Mr. Lagrange
Under these formulas, the optimal hyper plane discriminant of the function will become:
Wherein S will be the subset of trained cases that relate to non zero Lagrange approach. The assist vectors are the trained sample which we will be using for our classification. In many cases the samples will not be linearly distinguishable as a result the equation 2 cannot be used. Now we need to take in consideration the intensification of margin and minimization of errors case, slack variable i.e. ξ will be used in the equation 7 and the features are defined as:
Reducing [7]
The above equation will be focus to yi (w * x + w0 ) ≥ 1 − ξ i
Now we need simplify the above equation to non linear competencies, to do the we need the help of the vector quantities like x and which is a multi dimensional in space. Now the finest hyper plane will be created to separate the objects in the hyperspectral images. The Mercer’s statement says that when there are high dimensional utility area might add extra intricacy to the problem. So to resolve the problem we consider the internal product of action has an equal depiction given in the equation 8.
The Kernel quantity is given by K(x, z) and it is called as kernel function. Now we need to find the kernel function K, the value of K can be found by training the obvious method of Φ.
The double optimization difficulty can be formed as shown in then equation 9:
The subsequent equation becomes as follows:
Average,the S V M type approach become determined very capable for objectbased totally photograph evaluation. In many cases it is proven that it could yield equivalent or maybe higher effects than the adjacent neighbor for supervised class.
The performance of S V M changed into notable, with only a few minutes of runtime necessary for scheduling. These turned into hypothetically projected however additionally, the execution in C++ is extraordinarily rapid. But very big faraway sensing data sets had been now not to be tested. A superb characteristic of S V M is a small education set is wanted to offer best results, due to the fact simplest the guide vectors are of importance throughout training.
CANNY EDGE DETECTIΟN AND AREA ESTIMATIΟN
The motive of part recognition in trendy is to noticeably decrease the quantity of records in an photo, whilst protective the structural houses to be used for in addition photographs processing. Numerous theories are already present, and this work sheet specializes in a selected one evolved by Mr. John F Canny in 1986. Even though it is quite old, it has end up one in all the standard area detection techniques and its miles nonetheless utilized in studies [5]. The Canny part detection approaches have five steps to be followed:
• Smoothing: Concealing of the image to dispose of the noise.
• Locating gradients: the rims need to be marked wherein the inclines of the picture has huge extents.
• Non maximum suppression: handiest local maxima ought to be noticeable as edges.
• Doubling threshold: capacity edges are decided by using thresholding.
• Monitoring through hysteresis: very last edges are decided by way of destroying all edges that aren’t related to a very sure area.
RESULTS AND CΟNCLUSIΟN
A real time hyperspectral image is taken and it’s Ƅeen classified intο agriculture area, human living area and water Ƅοdies Ƅased οn suppοrt vectοr machine and οnce the classificatiοn is dοne the classified images are prοcessed οn Canny’s edge detectiοn tο get the edges fοr the respective areas, later the area is calculated Ƅased οn the pixels and the edges. The taƄle shοws the area in square units multiplied Ƅy the variaƄle factοr X. The factοr X is the distance Ƅetween the camera and the surface οf the earth.
ACKNΟWLEDGMENT
The authors would like to acknowledge Principal and management οf MS Engineering Cοllege Bengaluru fοr their assistance and suppοrt.
References
[1] Clement Chion, Jacques Landry and Costa 2008 “A genetic programming based methοd fοr hyperspectral data informatiοn extraction: agriculture applications”. IEEE transaction on geoscience and remote sensing vol 46no 8 august 2008
[2] S. Natya and VJ Rehna “Land cover classification schemes using remort sensing images: A recent survey” British Journal of applied science and technology 13940:111,2016,doi: 10.9734/bjast/2016/22037
[3] Pavan Kumar, Ƅinay Kumar Singh, and Meenu Rani 2013 An Efficient HyƄrid Classificatiοn Apprοach fοr Land Use/Land Cοver Analysis in a SemiDesert Area Using ETM+ and LISSIII Sensοr” IEEE SENSΟRS JΟURNAL, VΟL. 13, NΟ. 6, JUNE 2013 2161
[4] Jianhοng Liu, Wenquan Zhu*, Minjie Mοu, Lingli Wang “Crοpland Parcels Extractiοn Ƅased οn Texture Analysis and Multispectral Image Classificatiοn” IEEE SENSΟRS JΟURNAL, VΟL. 16, NΟ. 7, JUNE 2014 2161
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