CN115272776B - Hyperspectral image classification method based on double-path convolution and double attention and storage medium - Google Patents
Hyperspectral image classification method based on double-path convolution and double attention and storage medium Download PDFInfo
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Abstract
The invention relates to a hyperspectral image classification method and a storage medium based on double-path convolution and double attention, and belongs to the technical field of remote sensing images. The method comprises the following steps of S1, preprocessing an image; s2, cutting a sampling image block, and dividing a data set; s3, respectively sending the image blocks into the constructed space attention double-path convolution module and the constructed channel attention double-path convolution module, and respectively extracting the surface spectrum-space characteristics; s4, performing double-branch feature fusion on the spectrum-space features extracted by the two modules, and inputting the spectrum-space features into a basic double-path convolution network block to further extract the spectrum-space features; s5, sending the extracted spectrum-space characteristic mapping into a classifier for pixel classification, and calculating a loss value; and S6, iteratively training and optimizing the model, and obtaining the final hyperspectral image classification mapping by using the final model. The method can realize the extraction of discriminant and fine characteristics, and improve the classification performance and the generalization capability of the classification model.
Description
Technical Field
The invention relates to a hyperspectral image classification method, in particular to a hyperspectral image classification method and a storage medium based on two-way convolution and two-way attention, and belongs to the technical field of convolution neural networks, attention mechanisms and remote sensing images.
Background
The hyperspectral image is usually captured by an image spectrometer carried on an aviation platform, and abundant spectral information and spatial ground object information are recorded. Therefore, the hyperspectral image has very wide application in a plurality of fields such as mining exploration, ecological engineering, precision agriculture and urban planning. As a basic task in the field of hyperspectral image application, hyperspectral image classification is a base stone for a plurality of hyperspectral downstream applications, such as hyperspectral image target detection, hyperspectral image anomaly detection and hyperspectral image change detection, and the like, and needs to be based on the hyperspectral image target detection, the hyperspectral image anomaly detection and the hyperspectral image change detection. The hyperspectral image classification task aims at assigning a unique ground object semantic label to each pixel of the hyperspectral image.
According to the traditional hyperspectral image classification method based on the classical machine learning method, due to the fact that the prior knowledge and the manually set hyper-parameters are compared, ideal ground object assignment results are difficult to obtain in the aspects of discriminative classification and generalization classification of hyperspectral ground object scenes. In recent years, due to the strong spectrum-space feature extraction capability, a more ideal result is obtained in the hyperspectral image classification task, and the development and application of the hyperspectral image classification task are greatly promoted.
Currently, classification methods based on convolutional neural networks are receiving extensive attention in hyperspectral image classification tasks and demonstrate their excellent performance with their local perception and parameter sharing characteristics. For the hyperspectral image classification task, learning of more discriminative spectrum-space characteristics is the key for realizing more superior hyperspectral image classification results. In a hyperspectral image classification model based on image blocks widely used at present, the image blocks represent central pixels of the image blocks to complete extraction and final classification of spectral-spatial features, and ground object class labels of the image blocks and the ground object class labels are kept consistent. Based on the assumption that the adjacent pixels have a high probability of belonging to the unified ground object class, the neighborhood pixels of the central pixel play an assisting role in the classification process. However, it should be noted that the feature class labels of the neighborhood pixels relative to the center pixel may be different, and the inconsistency is more pronounced at feature class boundaries. Therefore, the contribution of the self-adaptive determination neighborhood pixels in the classification process can play a positive role in the ground feature discrimination. On the other hand, in the process of feature learning of the convolution model, different feature channels generate different contributions to the final discriminative power of the model, so that the adaptive enhancement and suppression of channel features is also the key for extracting more discriminative feature representation and realizing superior classification performance.
Attention is drawn to many artificial intelligence tasks because adaptive relationship mining can be implemented to facilitate discriminant feature learning. Attention mechanism is often embedded into a model and is trained with the model in a coordinated mode, feature units beneficial to a model task are emphasized through soft weight calculation, and feature units interfering with the model task are restrained to extract more robust features in a refined mode. At present, aiming at a hyperspectral image classification task, how to reasonably and efficiently utilize an attention mechanism to fully mine the characteristics of a spectrum domain and a space domain to enhance the ground object assignment performance of a model still remains to be solved.
Disclosure of Invention
The invention aims to overcome the defects and provide a hyperspectral image classification method based on two-way convolution and two-way attention.
The technical scheme adopted by the invention is as follows:
the hyperspectral image classification method based on two-way convolution and two-way attention comprises the following steps:
s1, carrying out standardization preprocessing on a loaded original image;
s2, cutting a sampling image block of the preprocessed image, and dividing a sampling data set into a training set, a verification set and a test set;
s3, respectively sending the same image block into a constructed space attention double-path convolution module and a constructed channel attention double-path convolution module, and respectively extracting the spectrum-space characteristics facing the self-adaptive space information and the self-adaptive channel information; the step of extracting the spectrum-space characteristics by the spatial attention double-path convolution module comprises the steps of performing primary characteristic extraction on an image block by using two paths of convolution networks arranged in parallel, merging the two paths of primary characteristics, performing channel-by-channel batch normalization and nonlinear activation function processing on the merged spectrum-space characteristics, performing spatial attention mapping extraction after the final batch normalization processing of the module, and then performing nonlinear activation function processing; the step of spectrum-space feature extraction of the channel attention double-path convolution module comprises the steps of performing primary feature extraction on an image block by using two paths of convolution networks which are arranged in parallel, performing channel attention mapping extraction after one path of primary feature extraction, then combining the extracted mapping feature with the other path of primary feature, and performing channel-by-channel batch normalization and nonlinear activation function processing on the combined spectrum-space feature;
s4, performing double-branch feature fusion on the spectrum-space features extracted by the two paths of modules, and inputting the spectrum-space features into a basic two-path convolution network block to further refine the spectrum-space features;
s5, the spectrum-space characteristic mapping obtained by thinning is sent to a classifier for pixel classification, and a loss value is calculated according to the generated label classification probability value;
and S6, iteratively training and optimizing the model, and obtaining the final hyperspectral image classification mapping by using the final model.
In the method, the two parallel convolution networks in the spatial attention two-way convolution module in the step S3 are realized by a 1 × 1 convolution layer, the output channel of the 1 × 1 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function, the output channel of the 3 × 3 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function; and S3, combining the two primary characteristics in the spatial attention two-way convolution module by using element-by-element addition. The spatial attention mapping extraction is realized through a spatial attention module, firstly, input spectrum-spatial feature maps are subjected to feature abstraction along channel dimensions by respectively using maximum pooling and mean pooling to respectively obtain a 2D spatial feature descriptor, the obtained two spatial feature descriptors are subjected to channel dimension splicing, then are sent to a 7 x 7 convolution layer for attention mapping learning, and are activated by joining a Sigmoid nonlinear function to obtain spatial attention mapping (soft weight spatial attention mapping capable of reflecting the importance degree of pixel information in an image block). And S3, the step of extracting the spectrum-space characteristics by the space attention double-path convolution module further comprises the step of multiplying the space attention mapping processed by the nonlinear activation function and the spectrum-space characteristic diagram originally input by the space attention double-path convolution module element by element in the space dimension so as to emphasize the neighborhood characteristics beneficial to characteristic extraction and inhibit the neighborhood characteristics with interference on the characteristic extraction.
S3, one path of the two paths of convolution networks arranged in parallel in the channel attention two-path convolution module is realized by a 1 x 1 convolution layer, the output channel of the 1 x 1 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function, the other path is realized by a 3 x 3 convolution layer, and the output channel of the 3 x 3 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function and then connected with channel attention mapping extraction; and S3, combining the mapping characteristics and the preliminary characteristics in the channel attention double-path convolution module by using element-by-element addition. Step S3, channel attention mapping extraction is achieved through a channel attention module, firstly, mean pooling is used for carrying out feature abstraction on an input spectrum-space feature graph along the space dimension to obtain a 1D channel feature descriptor, then a small double-layer fully-connected group is connected to achieve dimension increasing and dimension decreasing extraction of channel features, a nonlinear activation function embedded in the double-layer fully-connected group is a ReLU function, and then a Sigmoid nonlinear function is used for further nonlinear activation to obtain channel attention mapping (soft weight channel attention mapping capable of reflecting different channel importance degrees in the feature mapping). And S3, the step of extracting the spectrum-space characteristics by the channel attention two-way convolution module further comprises the step of multiplying the combined spectrum-space characteristics processed by the channel-by-channel batch normalization and the nonlinear activation function with the spectrum-space characteristic diagram originally input by the channel attention two-way convolution module element by element in the channel dimension so as to reinforce the self-adaptive channel characteristics.
And step 4, the dual-branch feature fusion is carried out by element-by-element addition, and the batch normalization processing is carried out channel-by-channel after the dual-branch feature fusion, so that the offset in the batch is eliminated, and the stability of feature extraction is improved. The basic two-way convolutional network block described in step S4 is composed of 1 × 1 and 3 × 3 convolutional layer branches, element-by-element addition operation, batch normalization operation, and ReLU activation function.
And the classifier in the step S5 uses a classic three-layer classifier to carry out final hyperspectral image pixel classification and comprises a mean pooling layer, a flattening layer and a full-link layer. The final classifier uses softmax activation function prediction to generate label classification probability, and uses cross entropy loss function to calculate loss value, wherein the cross entropy loss function is expressed as:
wherein, the first and the second end of the pipe are connected with each other,
the calculated loss value is represented by the value,Nrepresenting the number of samples of the single batch training set in which the model employs the small batch training mode, here a value of 32,Krepresenting the number of categories in the data scene,nandkseparately indexing the first of the current batch of training setsnSample and class labelsetkThe number of the categories is one,y n represents the first in the training set of the current batchnA true value of a number of samples of the hyperspectral image block,
represents an indication function wheny n Is composed ofkWhen the temperature of the water is higher than the set temperature,
is 1; if not, then the mobile terminal can be switched to the normal mode,
is 0, and in addition to this,
represents the considered secondnA hyperspectral image block sample belongs tokThe softmax function of the category outputs a probability value.
The iterative training and optimization model in the step S6 uses an Adam optimizer, the learning rate is set to be 0.001, the size of a single-batch training set in a small-batch training mode is 32, in model training, loss values corresponding to the training set and the verification set are calculated after each iteration is completed, and the model after 100 iterations is used as a final model. (iterative training is based on a training set, one iteration of the model is the process of inputting all training set samples and performing one-pass on the proposed model; and the Adam optimizer overall parameter setting is used for the stages of training, verifying and testing).
It is a further object of the present invention to provide a computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps of the hyperspectral image classification method based on two-way convolution and two-way attention as described above.
The beneficial effects of the invention are as follows:
(1) Convolution units with two scales of 1 × 1 and 3 × 3 convolution are used as basic branches to form a parallel feature extraction unit and are properly embedded into an attention module, and spatial attention and channel attention are embedded into a basic double-path convolution block to obtain more robust spectrum-space features in a spatial domain and a channel domain, so that more precise and more discriminant spectrum-space feature extraction in the spatial dimension and the channel dimension is realized;
(2) The two attention double-path convolution modules are integrally arranged in parallel, namely, neighborhood features beneficial to feature extraction can be emphasized, neighborhood features with interference on feature extraction can be restrained, and adaptive channel features can be strengthened, so that beneficial spectrum-space features in a space domain and a channel domain can be adaptively mined; the two adaptive attention modules can be seamlessly embedded into the proposed hyperspectral image classification model and trained along with a forward-backward propagation algorithm, and finally the feature distinguishing capability of the proposed classification model is enhanced;
(3) According to the method, two attention double-path convolution modules which are arranged in parallel, feature fusion and a further double-path convolution module are arranged to realize a superior hyperspectral image classification result in a cooperative mode, so that the model performance and the generalization capability on a hyperspectral image classification task are improved, and finally a foundation is laid for the superior ground feature distinguishing performance of the proposed model in multiple scenes.
Drawings
FIG. 1 is a schematic diagram of a model of the process of the present invention;
FIG. 2 is a flow chart of the method of the present invention;
FIG. 3 is a block diagram of a spatial attention module according to the present invention;
FIG. 4 is a block diagram of a channel attention module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Example 1
A hyperspectral image classification method based on two-way convolution and two-way attention comprises the following steps:
s1, image preprocessing
And respectively carrying out mean-variance standardization treatment on each spectral dimension of all pixel samples in the loaded original image so as to accelerate the convergence speed of the proposed classification model in the training process.
S2, image cutting blocking and data set splitting
Firstly, the image block of the preprocessed image is cut, and finally the image block is used as an input unit of the proposed classification model to finish the judgment of the ground feature type. Specifically, the boundary of the image is first filled with 0, and then random sampling is performed on each category in each data scene according to a set proportion to obtain a training sample, a verification sample and a test sample. For example, for the Indian Pines dataset and the Kennedy Space Center dataset, the training sample and validation sample account for 10% and 1%, respectively, with the remainder used as the sample test. For the Pavia University dataset, the training and validation samples account for 5% and 0.5%, respectively, with the remainder used as sample tests. When the number of certain sample classes is too small to meet the sampling requirement of the verification set, the lowest sampling number is set to ensure that each class is uniformly sampled approximately according to the proportion of the number of class samples. Specifically, when each pixel sample is sampled, an image block with the size of 9 × 9 × b is cut by taking the pixel as a center, wherein 9 × 9 represents the size of a spatial window of the image block, and b is the original spectral dimension of the image. And finally, respectively aggregating the training samples, the verification samples and the test samples of each category into a training set, a verification set and a test set.
S3, feature extraction is carried out on the space attention double-path convolution module and the channel attention double-path convolution module at the same time
As shown in fig. 1, in the present invention, an input spectrum-space image block is first sent to a space attention two-way convolution module and a channel attention two-way convolution module respectively to perform spectrum-space feature extraction oriented to adaptive space information and adaptive channel information. The proposed space attention two-way convolution module and channel attention two-way convolution module are based on the proposed two-way convolution block, the two-way convolution block is realized by two parallel convolution networks, namely a 1 x 1 convolution layer, a batch normalization operation and a ReLU nonlinear activation function are configured for an output channel of the 1 x 1 convolution layer, a 3 x 3 convolution layer is realized for one output channel of the 3 x 3 convolution layer, and the batch normalization operation and the ReLU nonlinear activation function are configured for the output channel of the 3 x 3 convolution layer. The merging of the two-way features is then done using element-by-element addition. The combined spectral-spatial features are further processed by batch normalization and ReLU nonlinear activation functions channel by channel. For the spatial attention two-way convolution module, spatial attention is used to be embedded between the last batch normalization of the module and the ReLU nonlinear activation function, wherein the spatial attention module used is the spatial attention module in the classical CBAM attention module, as shown in fig. 3. For the channel attention two-way convolution module, the channel attention is embedded between the 3 × 3 convolution layer branch and the element-by-element addition, wherein the adopted channel attention module is the classic SE attention module as shown in fig. 4.
For the spatial attention module, firstly, performing feature abstraction on a spectrum-spatial feature map input by the module by respectively using maximum pooling and mean pooling along channel dimensions to respectively obtain a 2D spatial feature descriptor, splicing the two obtained spatial descriptors in the channel dimensions, sending the two spatial descriptors into a 7 × 7 convolution layer for attention mapping learning, and joining a Sigmoid nonlinear function for activation to obtain spatial attention mapping (soft weight spatial attention mapping capable of reflecting the importance degree of pixel information in an image block). Finally, the spatial attention mapping processed by the nonlinear activation function and the spectrum-spatial feature graph originally input by the spatial attention module are subjected to element-by-element multiplication in spatial dimension to emphasize neighborhood features beneficial to feature extraction and inhibit the neighborhood features having interference on feature extraction. For the channel attention module, firstly, the spectral-spatial feature map input by the module is subjected to feature abstraction along the spatial dimension by using mean pooling to obtain a 1D channel feature descriptor. And then, a small double-layer fully-connected group is connected to realize the rising dimension and the falling dimension extraction of the channel characteristics, wherein the embedded nonlinear activation function is still the ReLU function used before. The channel attention map (a soft weighted channel attention map that may reflect different channel importance levels in the feature map) is then derived using a Sigmoid nonlinear function for further nonlinear activation. Finally, the spectrum-space characteristics after being combined and processed by the channel-by-channel batch normalization and the ReLU nonlinear activation function are multiplied element by element in the channel dimension by the spectrum-space characteristic diagram originally input by the channel attention module, so that the self-adaptive channel characteristics are strengthened.
Spatial attention and channel attention are embedded into the basic two-way convolution module, so that spectrum-spatial feature extraction with more fineness and more discriminativity in spatial dimension and channel dimension is realized, and finally a foundation is laid for the superior ground feature discrimination performance of the proposed model in multiple scenes. In addition to this, the two attention two-way convolution modules are arranged in parallel as a whole, so that the beneficial spectral-spatial features in the spatial domain and the channel domain can be adaptively mined.
S4, fusing double-branch characteristics, and further extracting characteristics by using basic two-way convolution network blocks
As shown in fig. 1, spectral-spatial feature mapping after refinement and extraction is performed by the spatial attention two-way convolution module and the channel attention two-way convolution module, dual-branch feature fusion is performed by element-by-element addition, and then batch normalization is performed channel-by-channel to eliminate offset in batches, thereby increasing the stability of feature extraction. And then, sending a basic two-way convolution network block to further extract the spectral-spatial characteristics, wherein the basic two-way convolution network block consists of 1 x 1 and 3 x 3 convolution layer branches, element-by-element addition operation, batch normalization operation and a ReLU activation function. The basic two-way convolutional network block further enhances the feature extraction capability of the proposed model.
S5, the obtained spectrum-space characteristic mapping is sent to a classifier for classification, and a loss value is calculated
As shown in figure 1, the invention uses a classic three-layer classifier to perform final hyperspectral image pixel classification, and comprises a mean pooling layer, a flattening layer and a full-link layer. The final classifier uses a softmax activation function to predict and generate label classification probability, and uses a cross entropy loss function to calculate a loss value, wherein the cross entropy loss function is expressed as:
wherein, the first and the second end of the pipe are connected with each other,
the calculated loss value is represented by the value,Nrepresenting the number of samples of the single batch training set in which the model employs the small batch training mode, here a value of 32,Krepresenting the number of categories in the scene of the data,nandkseparately index the first of the training set of the current batchnSample and class labelsetkEach class，y n Represents the first in the current batch training setnA true value of a number of samples of the hyperspectral image block,
represents an indication function wheny n Is composed ofkWhen the temperature of the water is higher than the set temperature,
is 1; if not, then,
is 0, and in addition to this,
represents the first considerednA hyperspectral image block sample belongs tokThe softmax function of the category outputs a probability value.
And S6, iteratively training and optimizing the model, and obtaining the final hyperspectral image classification mapping (namely the classified ground feature scene visual map) by using the final model. And iteratively training the proposed model in a back propagation mode according to the loss value, and updating parameters of the model. The iterative training is based on a training set. The network model provided by the invention uses an Adam optimizer, the learning rate is set to be 0.001, and the size of a single batch training set in a small batch training mode is 32. In model training, calculating loss values corresponding to a training set and a verification set after each iteration is completed, and using a model after 100 iterations as a final model. In the model testing stage, the cut image block testing set is used for performing model testing in different hyperspectral scenes, the classification performance of the model in each hyperspectral scene can be quantitatively measured according to the corresponding truth value label, and the model can obtain the visual image of the whole scene by assigning class labels to each pixel in the scene.
Example 2
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps in the hyperspectral image classification method based on two-way convolution and two-way attention as described in embodiment 1 above.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and scope of the present invention should be included in the present invention.
Claims (10)
1. The hyperspectral image classification method based on two-way convolution and two-way attention is characterized by comprising the following steps of:
s1, carrying out standardized preprocessing on a loaded original image;
s2, cutting a sampling image block of the preprocessed image, and dividing a sampling data set into a training set, a verification set and a test set;
s3, respectively sending the same image block into a constructed space attention double-path convolution module and a channel attention double-path convolution module, and respectively extracting the spectrum-space characteristics facing the self-adaptive space information and the self-adaptive channel information; the step of extracting the spectrum-space characteristics by the spatial attention double-path convolution module comprises the steps of performing primary characteristic extraction on an image block by using two paths of convolution networks arranged in parallel, merging the two paths of primary characteristics, performing channel-by-channel batch normalization and nonlinear activation function processing on the merged spectrum-space characteristics, performing spatial attention mapping extraction after the final batch normalization processing of the module, and then performing nonlinear activation function processing; the step of spectrum-space feature extraction of the channel attention double-path convolution module comprises the steps of performing primary feature extraction on an image block by using two paths of convolution networks which are arranged in parallel, performing channel attention mapping extraction after one path of primary feature extraction, then combining the extracted mapping feature with the other path of primary feature, and performing channel-by-channel batch normalization and nonlinear activation function processing on the combined spectrum-space feature;
s4, performing double-branch feature fusion on the spectrum-space features extracted by the two paths of modules, and inputting the spectrum-space features into a basic two-path convolution network block to further refine the spectrum-space features;
s5, the spectrum-space characteristic mapping obtained by thinning is sent to a classifier for pixel classification, and a loss value is calculated according to the generated label classification probability value;
and S6, performing iterative training and model optimization, and obtaining the final hyperspectral image classification mapping by using the final model.
2. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the two-way parallel convolution networks in the spatial attention two-way convolution module in the step S3 are realized by a 1 × 1 convolution layer, an output channel of the 1 × 1 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function, and one channel is realized by a 3 × 3 convolution layer, and an output channel of the 3 × 3 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function; and S3, combining the two primary characteristics in the spatial attention two-way convolution module by using element-by-element addition.
3. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the spatial attention mapping extraction is realized through a spatial attention module, firstly, feature abstraction is respectively performed on an input spectrum-spatial feature map by using maximum pooling and mean pooling along channel dimensions, respectively, a 2D spatial feature descriptor is obtained, the obtained two spatial feature descriptors are spliced through the channel dimensions, and then are sent to a 7 x 7 convolutional layer for attention mapping learning, and a Sigmoid nonlinear function is linked for activation, so that spatial attention mapping is obtained.
4. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the step of performing spectrum-space feature extraction by the space attention two-way convolution module in the step S3 further comprises the step of performing element-by-element multiplication on a space dimension by using a space attention map processed by a nonlinear activation function and a spectrum-space feature map originally input by the space attention two-way convolution module.
5. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the two-way convolution network in parallel arrangement in the channel attention two-way convolution module in the step S3 is realized by a 1 x 1 convolution layer, an output channel of the 1 x 1 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function, one is realized by a 3 x 3 convolution layer, and an output channel of the 3 x 3 convolution layer is configured with batch normalization operation and a ReLU nonlinear activation function and is followed by channel attention mapping extraction; and S3, combining the extracted mapping characteristics and the other primary characteristics in the channel attention two-way convolution module by using element-by-element addition.
6. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the channel attention mapping extraction in the step S3 is realized through a channel attention module, firstly, the input spectrum-space feature map is subjected to feature abstraction along the space dimension by using mean pooling to obtain a 1D channel feature descriptor, then, a small double-layer fully-connected group is connected to realize the dimension increasing and dimension decreasing extraction of the channel feature, wherein a nonlinear activation function embedded in the double-layer fully-connected group is a ReLU function, and then, a Sigmoid nonlinear function is used for further nonlinear activation to obtain the channel attention mapping.
7. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the step of extracting the spectrum-space features by the channel attention two-way convolution module in the step S3 further comprises the step of multiplying the combined spectrum-space features processed by batch normalization and nonlinear activation function with the spectrum-space feature map originally input by the channel attention two-way convolution module element by element in the channel dimension.
8. The method for classifying hyperspectral images based on two-way convolution and two-note according to claim 1, wherein the two-branch feature fusion in step S4 is performed by element-by-element addition, and the two-branch feature fusion is followed by channel-by-channel batch normalization, and the basic two-way convolution network block consists of two convolution layer branches of 1 x 1 and 3 x 3, an element-by-element addition operation, a batch normalization operation, and a ReLU activation function.
9. The hyperspectral image classification method based on two-way convolution and two-way attention according to claim 1 is characterized in that the classifier in the step S5 uses a classic three-layer classifier to perform final hyperspectral image pixel classification, the final classifier uses a softmax activation function to predict and generate label classification probability, a cross entropy loss function is used to calculate a loss value, and the cross entropy loss function is expressed as:
wherein the content of the first and second substances,
the calculated loss value is represented by the value,Nthe number of samples representing the single batch training set in which the model used the small batch training mode, here the value of 32,Krepresenting the number of categories in the data scene,nandkseparately index the first of the training set of the current batchnSample and class labelsetkThe number of the categories is one,y n represents the first in the training set of the current batchnA true value of a number of samples of the hyperspectral image block,
represents an indicator function wheny n Is composed ofkWhen the utility model is used, the water is discharged,
is 1; if not, then,
is 0, and in addition to this,
represents the considered secondnSample of hyperspectral image blockkThe softmax function of the category outputs a probability value.
10. A storage medium being a computer readable storage medium having stored thereon a computer program, characterized in that the program, when being executed by a processor, is adapted to carry out the steps of the method for hyperspectral image classification based on two-way convolution and two-note according to any of the claims 1-9.
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