CN105930876A - Plant image set classification method based on reverse training - Google Patents
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Abstract
The invention provides a plant image set classification method based on reverse training, and the method comprises four steps: (1), the preprocessing of a plant digital image; (2), the clustering and dividing of a training set, wherein a K-mean clustering method is employed; (3), the training of a classifier, and the classification of a testing set and a mixed training set; (4), integration classification, wherein a classification label of the testing set is outputted. The method employs a reverse training method, is good in classification effect, and is good in intelligibility.
Description
Technical field
The present invention relates to image set classification field, a kind of plant image collection sorting technique based on reverse training.
Background technology
Plant image Research on classifying method based on image set to as if: how to utilize disaggregated model correctly to identify and treat point
The image set classification of class.Categorizing system application based on image set is mainly: the identification of face, the classification of video image,
Ornamental plant identification, the identification etc. of Medicinal Plants.Over the years Chinese scholars in classification problem based on image set also
Propose a lot of algorithms.Therefore, the research of plant image categorizing system based on image set has major and immediate significance, and one
Denier research success also puts into application, will produce huge Social and economic benef@.
At present, the whole world has welcome big data age, shows according to up-to-date investigation, within 2015, will have more than 200
Hundred million terminal units are connected on the Internet, and by these intelligent terminals, the data total amount of generation will reach 40zb, entirely
The quantity of ball server also will rapidly increase.Just quickly setting out towards digital times in the world, has arrived the year two thousand twenty, the data of storage
Total amount will be bigger than 2010 50 times.A lot of experts and scholars think this data huge explosion just as a kind of novel oil, if
Can well utilize, using can be as a kind of novel Asset Type.Traditional data are the most all expressed by numeral,
And under big data age background, the data such as such as image text audio visual have all reacted the daily life of people from microcosmic
The every aspect lived, thus reflect the economic form of entire society.If able to these data collections are got up to carry out deeply
Research and excavation, it finds that the deep rule hidden and phenomenon in these data.
In traditional plant image identification problem, it is decent that the training of grader and test are all based on single or a small amount of figure
This carrying out.But being as the arrival of big data age, the collection of data stores the widespread development of technology such as sharing, very
All can obtain substantial amounts of plant image data in many application scenarios, these plant images can be that classification problem provides substantial amounts of instruction
Practice and test sample.And owing to the feature performance under the states such as varying environment time-temperature of the similar plant also differs,
Even if the features such as its Ye Hua of homophyletic plant also have larger difference, therefore sorting technique based on single image is the biggest by having
Limitation.Classification based on plant image collection will well solve problem above.As a example by concrete plant leaf blade identification, from one
Opening or can be partitioned into the leaf image under several different situations in multiple plant images, these images are naturally constituted
Multiple image collections corresponding to multiple plant individuals.At cognitive phase, equally collect plant individual to be identified many
Width leaf image set, thus replace individual leaf image in traditional method.Use these image collections of different plant, just
Plant leaf blade identification system based on image collection can be designed.
At present, classification problem based on image set, is more to apply in recognition of face problem based on video, this type of
The main direction of studying of problem is how to process the illumination attitude visual angle in video the problem such as to block, and makes full use of more
Image and the abundant changing pattern information that includes, set up face identification system based on image collection.From current figure
From the point of view of the development of image set Recognition Theory, recognizer based on image collection difference is mainly concentrated in entering each data acquisition system
Row mathematical modeling the and how model modeled being carried out on similarity measurement.
In current image collection category theory, the method for subspace modeling is that most study uses the widest one
Idea about modeling.Along with the further investigation of sub-space learning method, people attempt with subspace representation image collection, can be by data
Problem concerning study transfer the problem concerning study on subspace to, make solution simpler effectively.The work with initiative is
The mutual subspace method (Mutual Subspace Method, MSM) that O.Yamaguchi etc. propose.This method is directly often
Individual image collection is modeled as linear subspaces, then by the similarity between each sub spaces of main folder angular metric, finally by
Neighbour judges classification results.Owing to image covers the most apparent changing pattern of object, data sample itself might not divide
Cloth, in a linear space, therefore has much according to the improvement of MSM.Innovatory algorithm the earliest is the constraint of the propositions such as Fukui
Subspace algorithm (Constrained Mutual Subspace Method, CMSM) mutually, this algorithm owning image set
Sample point projects on the linear subspaces of a more identification, to solve sample point not asking at linear subspaces
Topic.T.K.Kim etc. propose a kind of dependency relation discriminant analysis method (Discriminant-analysis of Canonical
Correlations, DCC), this method utilizes and is similar to linear discriminant analysis (Linear Discriminant
Analysis, LDA) thought, according to minimizing in class dependency and maximizing dependency between class, in the hope of the projection of subspace
Transformation matrix.The major limitation of this kind of algorithm be only data sample be modeled as one linear spatially, then pass through phase
To more weak discriminant information (angle of linear space) tolerance similarity.
Along with the development of manifold learning, it was recognized that complex data is often distributed in a nonlinear manifold
On, the method modeled image set by the thought of manifold learning is arisen at the historic moment.Fan and Yeung etc. are modeled in sample data
In one nonlinear manifold, then use hierarchical clustering to go to excavate the local linear structure of manifold, each manifold is modeled
Become the set of multiple approximately linear subspace, use related angle to remove the similarity of metric linear subspace, last similarity
Result is determined by the method for comprehensive ballot.Hadid and Pietikainen uses the linear model of local to go to simulate non-thread equally
Property manifold.They are locally linear embedding into (Locally Linear Embedding, LLE) logarithm first by manifold learning arithmetic
According to carrying out dimensionality reduction, then utilize k means clustering algorithm to mark off different Clustering Model, use cluster centre to represent each class
Cluster sample, then obtains the distance between image set pair by the distance of tolerance and comprehensive these sample points pair.Wang etc. carry
Going out to calculate the framework (Manifold-Manifold Distance, MMD) of manifold spacing, its basic thought is: first figure
Image set closes and is modeled as a nonlinear manifold, then embeds clustering algorithm by maximum linear and manifold is expressed as one group of local
Linear model, the problem therefore calculating manifold distance is converted into the calculating partial model problem to spacing.Chen etc. use connection
Close rarefaction representation the subspace in manifold is modeled, then by calculating the reconstruction error of rarefaction representation, calculate son empty
Between pair between distance.Shao's often literary composition etc. proposes plant species machine identification method based on manifold spacing, is first extracted plant
Then multiple samples of each class are portrayed as a nonlinear manifold by the characteristics of image of image, and therefore identification problem converts
For the distance between the different manifold of tolerance.
Except the modeling method of linear/non-linear manifold, people attempt being modeled image collection by more method.
H.Cevikalp proposes to use affine hull and convex closure (Affine/Convex Hull) modeling, and algorithm uses affine hull, convex closure collection
Close sets theory image set is showed, then use the method for convex optimization try to achieve two bag nearest virtual point between away from
From, represent two distances gathered with this.Rarefaction representation is added in convex closure modeling by Yiqun Hu, proposes rarefaction approximation recently
The method (Sparse approximated nearest points, SANP) of adjoint point.Convex closure is added again on this by Meng
The constraint of regularization, reducing the complexity of SANP, improves classifying quality.
Image set is modeled by Wang etc. by the method for statistics, uses the second-order statistic of image set sample point i.e. to assist
Variance matrix describes image set, then makes the second-order statistic data being distributed in Riemann manifold be mapped to European by kernel function
Spatially, the LDA of classics or partial least squares algorithm is finally used to classify.Propose again after Lu to use multistage statistic
Describe image set, combine single order average, second order covariance matrix and the information of front Third order statistic, then use Multiple Kernel Learning
Method calculate the distance between image set.
Arif Mahmood etc. use semi-supervised spectral clustering to classify image set, first each class are modeled PCA
In space, then using semi-supervised hierarchical clustering to cluster all of sample point, label only rises when terminating cluster
Effect, then defines the distance between image set according to the probability distribution of every apoplexy due to endogenous wind sample.
Algorithm above major applications, in recognition of face based on video, or relatively lacks in the classification of plant image collection
Weary.
Summary of the invention
Present invention is primarily targeted at and overcome drawbacks described above of the prior art, propose a kind of based on planting of inversely training
Object image collection sorting technique.The method can provide a kind of big test sample collection and big training sample in classifying for plant image
The efficient grader of collection, it is achieved Fast Learning and high accuracy identify.
The present invention adopts the following technical scheme that
A kind of plant image collection sorting technique based on reverse training, for test set to be identified is classified, its
Being characterised by, the plant digital picture of acquisition known class label is as training set in advance, and remaining step is as follows:
1) training set image and test set image to be identified are carried out pretreatment to extract feature;
2) sample set of training set is clustered respectively, then split into combined training collection and remaining training set;
3) combined training collection is trained two graders with test set to be identified;
4) by step 2) remaining training set input step 3) two graders, i.e. can obtain remaining each sample in training set
The class label of this set, obtains remaining the sample that in training set sample set, the output label of sample is identical with test set label
Number, the known class label of the training set that wherein proportion is most is required test set class label.
Preferably, in step 1) described in pretreatment include sample carrying out binaryzation, smoothing, split and standardize,
And extract Gist feature and PHOG feature.
Preferably, in step 2) in, described cluster uses K mean algorithm.
Preferably, in step 2) in, described is split as purposiveness fractionation or purposiveness selection.
Preferably, in step 2) in, the picture number step 1 to be close or equal to of described combined training collection) described in
The picture number of test set to be identified.
Preferably, described two graders use support vector machine.
From the above-mentioned description of this invention, compared with prior art, there is advantages that
One simple sorting algorithm is expanded to solve many classification problems by the reverse training of the present invention.Compared to by a pair
One, two classification of one-to-many expand to many classification problems, and reverse training is more efficient, it is only necessary to train two graders.Real
Testing result to also indicate that, compared to existing image set sorting technique, the method can provide a kind of in classifying for plant image
Big test sample collection and the efficient grader of big training sample set, it is achieved Fast Learning and high accuracy identify.
Accompanying drawing explanation
Fig. 1 is the model of the inventive method, and in figure, training set and the test set image of input are to have entered pretreatment;Figure
In, Training set is expressed as training set image set set;Query Image set is expressed as single test image set;
Divided is that the fractionation of training set purpose obtains combined training collection;Train binary classifier is expressed as combined training collection
Grader is trained with test set;Test x2 on trained Classifier represents to test in the grader trained and tears open
Divide remaining training set X2, obtain the training set set with test set identical category;
Fig. 2 is the flow chart of the inventive method;
Fig. 3 is in the case of extracting training set image pattern different characteristic, the classification accuracy of the inventive method;
Fig. 4 is existing image set sorting algorithm classification accuracy in selected plant image storehouse.
Detailed description of the invention
Below by way of detailed description of the invention, the invention will be further described.
With reference to Fig. 1, Fig. 2, a kind of plant image collection sorting technique based on reverse training, for by test set to be identified
Classify, it is assumed that the test set of this band identification isOutput class distinguishing label y.The method can provide a kind of for
Big test sample collection and the efficient grader of big training sample set in plant image classification, it is achieved Fast Learning and high accuracy are known
Not.The plant digital picture of acquisition known class label is as training set in advance, and this training set includes M image set: X1,
X2,...,XM, the c image set Xc={ xt|yt=c:t=1,2 ..., Nc, comprise NcOpen similar picture, this image set label
For yc∈[1,2,...,M].Remaining step is as follows:
1) training set image and test set image to be identified are carried out pretreatment, including binaryzation, smooth, split, advise
Generalized, obtains the image that pretreatment obtains, and extracts suitable characteristics of image, such as Gist feature and PHOG feature.The present invention
The method using two characteristic line combinations carries out plant image and inversely trains, and characteristic information linear combination function is: F=α
F1+βF2, wherein 0≤α≤1,0≤β≤1 and alpha+beta=1, F1: be characterized collection vector 1, F2 is characterized collection vector 2.
Wherein, a kind of effective ways describing picture shape information are gradient orientation histogram (Histogram of
Orientated Gradients, HOG), HOG feature, can be fine by extracting edge or the distribution of gradient of regional area
Ground characterizes edge or the gradient-structure of regional area internal object, and then characterizes the shape of target.Bosch proposes tower-type gradient direction
Rectangular histogram (Pyramid Histogram of Orientated Gradients, PHOG), PHOG is excellent relative to tradition HOG's
Point, is the feature that different scale can be detected, and ability to express is higher.First edge image is carried out pyramid and divides by PHOG feature
Layer, then on every layer extract HOG feature, finally the characteristic vector of each layer is coupled together represent PHOG characteristic vector.This
Outward, the contextual information extracting image that GIST feature is brief and concise, the vision of analog quantity people extracts process.According to Oliva and
The method that Torralba proposes, is divided into 4 × 4 by processing, by the Gabor filter group in 8 directions of 4 yardsticks, the image obtained
Grid, say, that the Gist intrinsic dimensionality finally obtaining image is 4 × 4 × 32=512.
2) K mean algorithm is used the training set of each class of training set to be polymerized to K bunch respectively, as training set Xc=
{X1,X2,...,XK, generate after cluster bunch choose the picture of some and be combined into combined training training set X1=
{x1,x2,…,xj, X1The number j of middle image is identical or close with the picture number of test set to be identified, and this step is referred to as
For the purpose of Sexual behavior mode or purposiveness split.The remaining part of training set is remaining training set
It is to haveOpen the X of imagecThe image pattern that the image pattern of the fractionation of image set is chosen in other words conj.or perhaps, wherein(whole
Number), X1ForRemaining training set X2For X2=X X1,
3) by combined training collection X1Two graders are trained with test set Y to be identified.I.e. one two grader of training
C1.Training is at X1, Y does.In test set Y to be identified, all image tagged are+1, combined training collection X1In all of figure
Image scale is designated as-1.By X1In comprise and the generic image of Y as exterior point.Further, it is contemplated that test phase X2In image be input to
Two grader C1In, grader needs the disposal ability to uncertain data, and support vector machine (SVM) is solving line
There is convex optimization theoretical background the most in the problem that property can be divided, have the optimizing algorithm of fixing set pattern, in the problem of linear separability
On have bigger disturbance rejection, over-fitting problem can be solved.So the present invention selects linear SVM (Support
Vector Machine with a l inear Kernel).Sample-the label of a given training set is to (x(t),y(t)),y(t)∈ {+1 ,-1}, grader C1Optimization problem be:In formula, w is for being
Number vector;C > 0 is punishment parameter.
4) respectively by remaining training set X2In the image of each classification be input to the grader C that previous step trains1Middle knowledge
Not, i.e. can get the class label of each residue training set sample set, obtain remaining the defeated of sample in training set sample set
The number of samples that outgoing label is identical with test set label, the known class label of the training set that wherein proportion is most is required survey
Examination collection class label.Because X2In the label of each class be known, so the X identical with test set Y classification to be identified2In
The most classification of certain quantity be exactly y.Concrete, the picture of input and the generic picture of Y will be marked as+1, be designated asCalculateClass label normalized frequency histogram h, if hcFor at X2Middle c class is identified as+1 figure
The percentage ratio of sheet, then
Export the class label y of test set Y to be identified.X2In to be identified as the maximum class of number of pictures of+1 be anticipated
The class label of Y
One simple sorting algorithm is expanded to solve many classification problems by the reverse training of the present invention.Compared to by a pair
One, two classification of one-to-many expand to many classification problems, and reverse training is more efficient, it is only necessary to train two graders.Real
Testing result to also indicate that, compared to existing image set sorting technique, the method that the present invention proposes is more efficient.
Illustrate
The plant leaf blade data base set up from Chinese Academy of Sciences's Hefei mechanical intelligence computing laboratory, this data base contains 221 kinds
Plant totally one ten thousand seven thousand several leaf images, and gather in different time, different plants, the most different blade figures
As being affected by factors such as illumination, visual angle, deformation.Selecting 83 kinds of plants in research, picture sum, more than 30,000, divides at random
Become test set and training set.Every leaf image is individual vanes, carries out pretreatment, and image resolution ratio is 30 × 30, examines
Consider and need great amount of samples collection to experiment, so each image pattern collection contains super many 200 pictures in Shi Yan.Randomly draw image
Sample part composition training sample set, another part composition test sample collection.
A. the result that plant leaf blade different characteristic is extracted
Setting progression as L=3, gradient direction is divided into 20 intervals, and PHOG descriptor is just by 3 gradient orientation histograms
Characteristic vector order couples becomes 420 dimensions, the 512 dimension GIST features in 8 directions of 4 yardsticks.
B. the linear combination of characteristics of image
The commonly used feature of blade classification has color characteristic, textural characteristics, shape facility, local feature.Visible single
Feature can not well characterize blade information, so using the method for two characteristic line combinations to carry out plant image herein
Reverse train, characteristic information linear combination function is:
F=α F1+βF2, wherein 0≤α≤1,0≤β≤1 and alpha+beta=1
C. Ensemble classifier
Use the Ensemble classifier algorithm in the present invention that plant image collection is classified.By PHOG feature GIST Feature Fusion
Test as plant leaf blade feature.Contrast method have mutual subspace method (Mutual Subspace Method,
MSM), based on manifold-manifold distance frame method (Manifold-Manifold Distance, MMD), divide based on popular differentiation
Analysis method (Manifold Discriminant Analysis, MDA), covariance diagnostic method (Covariance
Discriminative Learning, CDL), method (Affine/Convex Hull based on convex closure and affine hull distance
Based Image set Distance, AHISD/CHISD), the rarefaction nearest point methods (Sparse of approximation
Approximated nearest points, SANP), closest approach algorithm (Regularized Nearest based on regularization
Points,RNP).In test, the parameter of above method is both referred to the optimal value of correlative theses, Setup Experiments. and Fig. 3 is for carry
In the case of taking training set image pattern different characteristic, the classification accuracy of the inventive method, Fig. 4 is that the classification of existing image set is calculated
Method is classification accuracy in selected plant image storehouse.
Above are only the detailed description of the invention of the present invention, but the design concept of the present invention is not limited thereto, all utilize this
Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior invading scope.
Claims (6)
1. a plant image collection sorting technique based on reverse training, for being classified by test set to be identified, it is special
Levying and be, the plant digital picture of acquisition known class label is as training set in advance, and remaining step is as follows:
1) training set image and test set image to be identified are carried out pretreatment to extract feature;
2) sample set of training set is clustered respectively, then split into combined training collection and remaining training set;
3) combined training collection is trained two graders with test set to be identified;
4) by step 2) remaining training set input step 3) two graders, i.e. can obtain remaining each sample in training set
The class label of set, obtains the sample that in the sample set of residue training set, the output label of sample is identical with test set label
Number, the known class label of the training set that wherein proportion is most is required test set class label.
A kind of plant image collection sorting technique based on reverse training, it is characterised in that: in step
1) pretreatment described in includes sample carrying out binaryzation, smoothing, split and standardize, and extracts Gist feature and PHOG spy
Levy.
A kind of plant image collection sorting technique based on reverse training, it is characterised in that: in step
2), in, described cluster uses K mean algorithm.
A kind of plant image collection sorting technique based on reverse training, it is characterised in that: in step
2), in, described is split as purposiveness fractionation or purposiveness selection.
A kind of plant image collection sorting technique based on reverse training, it is characterised in that: in step
2) in, the picture number step 1 to be close or equal to of described combined training collection) described in the picture number of test set to be identified
Mesh.
A kind of plant image collection sorting technique based on reverse training, it is characterised in that: described two
Grader uses support vector machine.
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