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3 boyutlu evrişimsel sinir ağı kullanılarak hiperspektral görüntülerin sınıflandırılması
(Bingöl Üniversitesi, 2022) Fırat, Hüseyin; Hanbay, Davut
Hiperspektral görüntü sınıflandırma, uzaktan algılanan görüntülerin analizi için yaygın olarak kullanılmaktadır. Bir hiperspektral görüntü, uygulamalarda büyük potansiyele sahip olan yer nesnelerinin zengin spektral bilgilerini ve uzamsal bilgilerini içermektedir. Spektral uzamsal bilgi kullanımı hiperspektral görüntü sınıflandırmasının performansını önemli ölçüde arttırmaktadır. Hiperspektral görüntüler, 3B küpler biçiminde gösterilmektedir. Bu nedenle, 3B uzamsal filtreleme, bu tür görüntülerdeki spektral uzamsal özellikleri eşzamanlı olarak çıkarmak için doğal olarak basit ve etkili bir yöntem sunmaktadır. Bu çalışmada, hiperspektral görüntü sınıflandırması için bir 3B evrişimli sinir ağı (3B ESA) yöntemi önerilmiştir. Önerilen yöntem, derin spektral uzamsal birleştirilmiş özellikleri etkin bir şekilde çıkarmaktadır. Aynı zamanda herhangi bir ön işleme veya son işleme dayanmadan hiperspektral görüntü küpü verileri toplu olarak görüntülemektedir. Hiperspektral görüntü küpü önce küçük üst üste binen 3B parçalara bölünmektedir. Daha sonra bu parçalar, spektral bilgileri de koruyan birden çok bitişik bant üzerinde bir 3B çekirdek işlevi kullanarak 3B özellik haritaları oluşturmak için işlenmektedir. Önerilen yöntem indian pines, pavia üniversitesi ve botswana veri setleri ile test edilmiştir. Deneysel çalışmalar sonucunda, indian pines için %99,35, pavia üniversitesi için %99,90 ve botswana için ise %99,59 genel doğruluk sonuçları elde edilmiştir. Sonuçlar, 4 farklı derin öğrenme tabanlı yöntemle karşılaştırılmıştır. Deneysel sonuçlardan, önerilen 3B ESA yöntemimizin daha iyi performans gösterdiği görülmektedir.
3D residual spatial-spectral convolution network for hyperspectral remote sensing image classification
(Springer London Ltd, 2023) Firat, Huseyin; Asker, Mehmet Emin; Bayindir, Mehmet Ilyas; Hanbay, Davut
Hyperspectral remote sensing images (HRSI) are 3D image cubes that contain hundreds of spectral bands and have two spatial dimensions and one spectral dimension. HRSI analysis are commonly used in a wide variety of applications such as object detection, precision agriculture and mining. HRSI classification purposes to assign each pixel in HRSI to a unique class. Deep learning is seen as an effective method to improve HRSI classification. In particular, convolutional neural networks (CNNs) are increasingly used in remote sensing field. In this study, a hybrid 3D residual spatial-spectral convolution network (3D-RSSCN) is proposed to extract deep spatiospectral features using 3D CNN and ResNet18 architecture. Simultaneously spatiospectral features extraction is provided using 3D CNN. In deeper CNNs, ResNet architecture is used to achieve higher classification performance as the number of layers increases. In addition, thanks to the ResNet architecture, problems such as degradation and vanishing gradient that may occur in deep networks are overcome. The high dimensionality of the HRSIs increases the computational complexity. Thus, most of studies apply dimension reduction as preprocessing. In the proposed study, principal component analysis (PCA) is used as the preprocessing step for optimum spectral band extraction. The proposed 3D-RSSCN method is tested with Indian pines, Pavia University and Salinas datasets and compared against various deep learning-based methods (SAE, RPNet, 2D CNN, 3D CNN, M3D CNN, HybridSN, FC3D CNN, SSRN, FuSENet, S3EResBoF). As a result of the applications, the best classification accuracy among these methods compared in all datasets is obtained with the proposed 3D-RSSCN. The proposed 3D-RSSCN method has the best accuracy and time performance in classifying.
4CF-Net: New 3D convolutional neural network for spectral spatial classification of hyperspectral remote sensing images
(Gazi University, 2022) Fırat, Hüseyin; Hanbay, Davut
Hyperspectral images (HSI) are contiguous band images commonly used in remote sensing. Deep learning (DL) is an effective method used in HSI classification. Convolutional neural networks (CNN) are one of the DL methods used in HSI classification. It provides automated approaches that can learn abstract features of HSIs from spectral-spatial fields. The high dimensionality of the HSIs increases the computational complexity. Therefore, most of the developed CNN models perform dimensionality reduction as a preprocessing step. Another problem in HSI classification is that spectral-spatial features must be considered in order to obtain accurate results. Because, HSI classification performance is highly dependent on spectral spatial information. In this study, a new 3D CNN model is proposed for HSI classification. The proposed method provides an effective method to simultaneously extract spectral-spatial features in HSIs. The network uses the 3D hyperspectral cube at the input. Principal component analysis is used to eliminate the dimensional redundancy in the hyperspectral cube. Then, using neighborhood extraction, spectral-spatial features are extracted effectively. The proposed method has been tested with 4 datasets. The application results were compared with 7 different DL-based methods and it was seen that our 4CF-Net method showed better classification performance.
Classification of Hyperspectral Images Using 3D CNN Based ResNet50
(Ieee, 2021) Firat, Huseyin; Hanbay, Davut
Hyperspectral images are images containing rich spectral and spatial information widely used in remote sensing applications. The development of deep learning techniques has had a significant impact on the classification of hyperspectral images. Different Convolutional Neural Network architectures have been used in many hyperspectral image analysis studies. However, the high dimensions of the hyperspectral images increased the computational complexity. For this reason, dimensionality reduction has been used in the preprocessing stage in many studies. Another difficulty encountered in hyperspectral image classification studies is the need to consider both spectral and spatial features. When deep spatial and spectral features are to be extracted, problems such as loss of gradient properties and degradation due to increased depth arise. In this study, the 3D convolutional neural network (CNN) based ResNet50 method is proposed to solve these problems encountered in hyperspectral studies and to extract sufficient spatial spectral properties from the network. Principal Component Analysis (PCA) was used to reduce spectral band excess. The proposed method has been applied to Pavia University and Salinas data sets. Overall accuracy, average accuracy and kappa values were used to measure the performance of the method. Calculated overall accuracy, average accuracy, and kappa values are 99.99% for the Pavia University data set, and while the overall accuracy and kappa values were 99.99% for the Salinas data set, the average accuracy value was 99.98%.
Classification of hyperspectral remote sensing images using different dimension reduction methods with 3D/2D CNN
(Elsevier, 2022) Fırat, Hüseyin; Asker, Mehmet Emin; Hanbay, Davut
The high dimensionality of hyperspectral remote sensing images (HRSI) affects the classification performance. Therefore, most HRSI classification methods use dimension reduction methods as a solution for high dimensionality. It is aimed to extract useful features with dimension reduction methods. At the end of this process, the data dimension is reduced and the transaction cost is decreased. In this study, LDA, PCA, IPCA, ICA, SPCA, RPCA and SVD dimension reduction methods were applied as a preprocessing step to improve HRSI classification performance. Since HRSI is volumetric data and has a spectral dimension, 2D CNN cannot extract good distinguishing features from spectral dimensions. Because 2D CNN only considers spatial information. With 3D CNN, spectral-spatial features are extracted simultaneously. However, 3D CNN increases the computational cost. Therefore, in this study, Hybrid 3D/2D CNN method is used together with dimension reduction methods. Hybrid CNN method consists of a combination of 3D CNN, 2D CNN and depthwise separable convolution. While 3D CNN extracts common spectral-spatial features, more spatial features are learned with 2D CNN used after 3D CNN. With depthwise separable convolution, it reduces the number of parameters and overfitting is prevented. The applications performed on the frequently used HRSI benchmark datasets show that the classification performance of the proposed method is better than the compared methods. In addition, Indian pines, HyRANK-Loukia, Botswana and Pavia of University datasets are used to examine the effect of dimension reduction methods used together with the hybrid 3D/2D CNN method on classification performance. As a result of the applications, the best classification accuracies were obtained in PCA, LDA and IPCA with Indian pines, PCA with Pavia of university, PCA and IPCA with Salinas, PCA, RPCA and LDA dimension reduction methods with HyRANK-Loukia.
Classification of Hyperspectral Remote Sensing Images Using Hybrid 3D-2D CNN Architecture
(Ali KARCI, 2021) Fırat, Hüseyin; Uçan, Murat; Hanbay, Davut
Hyperspectral remote sensing images (HRSI) are image cubes with two spatial and one spectral dimensions. Convolutional neural network (CNN) is one of the most effective deep learning methods for extracting spatial-spectral feature information in HRSI classification. Traditional CNN-based methods usually use 2D CNN for feature extraction. Because 2D CNN captures only spatial-dimensional features, it cannot extract good feature maps from spectral dimensions. 3D CNN can simultaneously extract spatial-spectral features in HRSI. However, 3D CNN is computationally complex. In this study, a hybrid method consisting of 3D-2D CNN combination is proposed. While 3D CNN extracts common spatial-spectral features, more spatial features are learned with 2D CNN used after 3D CNN. In addition, the proposed hybrid method reduces the computational complexity. Mish activation function is used to increase the classification performance of the proposed method. As a result of the applications performed with two commonly used datasets, it is seen that the proposed method has better classification performance.
Comparison of 3D CNN based deep learning architectures using hyperspectral images
(Gazi Univ, Fac Engineering Architecture, 2023) Firat, Huseyin; Hanbay, Davut
Hyperspectral images (HSI) are 3-dimensional (3D) image cubes with two spatial and one spectral dimensions. The development of deep learning methods has had a significant impact on HSI classification. Especially convolutional neural network (CNN) based methods are getting more attention in this field. In this study, we make use of the deep learning architectures LeNet5, AlexNet, VGG16, GoogleNet and ResNet50, which are among the successful examples of CNN for the HSI classification problem. We use a 3D CNN-based hybrid approach when using these architectures. Because, using 3D CNN, spectral-spatial features are extracted simultaneously. In this case, the classification accuracy of HSIs is increased with the spectral-spatial-based deep learning architecture. However, in the proposed model, principal component analysis (PCA) is used as a preprocessing technique for optimal band extraction from HSIs. After applying PCA, 3D cubes are obtained by neighborhood extraction and given to the input of deep learning architectures. Indian pines, Salinas, Botswana and HyRANK-Loukia datasets were used to compare the classification performances of 3D CNN-based deep learning architectures. As a result of the applications, the best classification accuracy was obtained with VGG16 architectures in Indian pines dataset, ResNet50 in Botswana dataset, VGG16 in HyRANK-Loukia dataset, LeNet5 and VGG16 architectures in Salinas dataset.
Hiperspektral görüntü sınıflandırması için derinlemesine ayrılabilir evrişim tabanlı artık ağ mimarisi
(Gazi Üniversitesi, 2022) Fırat, Hüseyin; Asker, Mehmet Emin; Hanbay, Davut
Hiperspektral uzaktan algılama görüntüleri (HUAG), yüzlerce spektral bant içeren ve iki uzamsal-bir spektral boyuta sahip 3B görüntü küpleridir. Sınıflandırma, HUAG’de en popüler konulardan biridir. Son yıllarda HUAG sınıflandırması için çok sayıda derin öğrenme yöntemi önerilmiştir. Özellikle Evrişimli Sinir Ağları (ESA), HUAG'lerin sınıflandırılmasında yaygın olarak kullanılmaktadır. ESA, daha yüksek kaliteli HUAG sınıflandırması için daha ayırt edici özellikler sağlayabilen güçlü bir özellik öğrenme yeteneğine sahiptir.Bu çalışma kapsamında 3B/2B ESA, Artık ağ mimarisi ve Derinlemesine ayrılabilir evrişimin birlikte kullanıldığı bir yöntem önerilmiştir. Daha derin ESA'larda, katman sayısı arttıkça daha yüksek sınıflandırma performansı elde etmek için artık ağ kullanılmaktadır. Ayrıca artık ağ sayesinde derin ağlarda oluşabilecek bozulma ve gradyanların yok olması gibi sorunların üstesinden gelinmektedir. Öte yandan, hesaplama maliyetini azaltan, aşırı öğrenmeyi önleyen ve daha fazla uzamsal özellik çıkarımı sağlayan Derinlemesine ayrılabilir evrişimler kullanılmıştır. Son olarak, 3B ESA ile HUAG’lerden uzamsal-spektral özellikler eş zamanlı olarak çıkarılmaktadır. Ancak sadece 3B ESA kullanımı hesaplama karmaşıklığını arttırmaktadır. Yalnızca 2B ESA kullanımı ile de HUAG’lerden sadece uzamsal özellikler çıkarılmaktadır. Spektral özellikler çıkarılamamaktadır. 3B ESA ile 2B ESA’nın birlikte kullanılmasıyla bu iki problem çözülmüştür. Ayrıca önerilen yöntemde optimum spektral bant çıkarımı için temel bileşen analizi bir ön işleme adımı olarak kullanılmıştır. Popüler iki HUAG kıyaslama veriseti olan Indian pines ve Salinas verisetleri kullanılarak uygulamalar gerçekleştirilmiştir. Uygulamalar sonucunda Indian pines ile %99.45 ve Salinas ile %99.95 genel doğruluk sonucu elde edilmiştir. Elde edilen sınıflandırma sonuçları, önerilen yöntemin sınıflandırma performansının mevcut yöntemlerden daha iyi olduğunu göstermektedir.
Hybrid 3D Convolution and 2D Depthwise Separable Convolution Neural Network for Hyperspectral Image Classification
(2022) Asker, Mehmet Emin; Fırat, Hüseyin; Hanbay, Davut
Convolutional neural networks (CNNs) are one of the popular deep learning methods used to solve the hyperspectral image classification (HSIC) problem. CNN has a strong feature learning ability that can ensure more distinctive features for higher quality HSIC. The traditional CNN-based methods mainly use the 2D CNN for HSIC. However, with 2D CNN, only spatial features are extracted in HSI. Good feature maps cannot be extracted from spectral dimensions with the use of 2D CNN alone. By using 3D CNN, spatial-spectral features are extracted simultaneously. However, 3D CNN is computationally complex. In this study, a hybrid CNN method, which is a combination of 3D CNN and 2D CNN, is improved to solve the two problems described above. Using hybrid CNN decreases the complexity of the method compared to using only 3D CNN and can perform well against a limited number of training samples. On the other hand, in Hybrid CNN, depthwise separable convolution (DSC) is used, which decreases computational cost, prevents overfitting and enables more spatial feature extraction. By adding DSC to the developed hybrid CNN, a hybrid depthwise separable convolutional neural network is obtained. Extensive applications on frequently used HSI benchmark datasets show that the classification performance of the proposed network is better than compared methods.
Hybrid 3D/2D Complete Inception Module and Convolutional Neural Network for Hyperspectral Remote Sensing Image Classification
(Springer, 2023) Firat, Huseyin; Asker, Mehmet Emin; Bayindir, Mehmet Ilyas; Hanbay, Davut
Classification in hyperspectral remote sensing images (HRSIs) is a challenging process in image analysis and one of the most popular topics. In recent years, many methods have been proposed to solve the HRSIs classification problem. Compared to traditional machine learning methods, deep learning, especially convolutional neural networks (CNNs), is commonly used in the classification of HRSIs. Deep learning-based methods based on CNNs show remarkable performance in HRSIs classification and greatly support the development of classification technology. In this study, a method in which the Hybrid 3D/2D Complete Inception module and the Hybrid 3D/2D CNN method are used together has been proposed to solve the HRSIs classification problem. In the proposed method, multi-level feature extraction is performed by using multiple convolution layers with the Inception module. This improves the performance of the network. Conventional CNN-based methods use 2D CNN for feature extraction. However, only spatial features are extracted with 2D CNN. 3D CNN is used to extract spatial-spectral features. However, 3D CNN is computationally complex. Therefore, in the proposed method, a hybrid approach is used by first using 3D CNN and then 2D CNN. This reduces computational complexity and extracts more spatial features. In addition, PCA is used as a preprocessing step for optimum spectral band extraction in the proposed method. The proposed method has been tested using Indian pines, Salinas, University of Pavia, HyRANK-Loukia and Houston datasets, which are frequently used in studies for HRSIs classification. The overall accuracy of the proposed method in these five datasets are 99.83%, 100%, 100%, 90.47% and 98.93%, respectively. These results reveal that the proposed method provides higher classification performance compared to state-of-the-art methods.
Hyperspectral Image Classification Using MiniVGGNet
(Ali KARCI, 2021) Fırat, Hüseyin; Uçan, Murat; Hanbay, Davut
Hyperspectral image classification is widely used in the analysis of remote sensing images. Recently, deep learning has been seen as the most effective method for hyperspectral image classification. Especially, Convolutional neural networks (CNN) are getting more and more attention in this field. CNN provides automated approaches that can learn more abstract features of hyperspectral images from spectral, spatial or spectral-spatial fields. In this study, a 3D CNN based MiniVGGNet network is proposed to take full advantage of the relationships between hyperspectral features and to increase the classification accuracy. With 3D CNN, spectral-spatial features are extracted simultaneously. With MiniVGGNet, the number of trainable parameters is reduced and the training time is shortened. In addition, principal component analysis (PCA) is used as a preprocessing method to reduce the computational complexity caused by the high dimensionality of hyperspectral images. In order to test the performance of the proposed method, applications were performed on remote sensing datasets of Indian Pines, University of Pavia and Salinas. The results were compared with different deep learning-based methods. Better classification performance is obtained by using the proposed method for hyperspectral image classification.
Multiscale Feature Fusion for Hyperspectral Image Classification Using Hybrid 3D-2D Depthwise Separable Convolution Networks
(Int Information & Engineering Technology Assoc, 2023) Firat, Hueseyin; Cig, Harun; Guellueoglu, Mehmet Tahir; Asker, Mehmet Emin; Hanbay, Davut
Hyperspectral remote sensing images (HRSI) comprise three-dimensional image cubes, containing a single spectral dimension alongside two spatial dimensions. HRSI are presently among the foremost essential datasets for Earth observation. The task of HRSI classification is intricate due to the influence of spectral mixing, leading to notable variability within classes and resemblances across classes. Consequently, the field of HRSI classification has garnered significant research attention in recent times. Convolutional Neural Networks (CNNs) are harnessed to address these issues, enabling both feature extraction and classification. This study introduces a novel approach for HRSI classification called the hybrid 3D-2D depthwise separable convolution network (Hybrid DSCNet), which leverages multiscale feature integration. Within the Hybrid DSCNet, diverse kernel sizes contribute to an enriched feature extraction process from HRSI. The conventional 3D-2D CNN, while effective, comes with a computational load. Instead of using the standard 3D-2D CNN, this study adopts the 3D-2D DSC architecture. This approach partitions the conventional convolution into two components: pointwise and depthwise convolution, yielding a substantial reduction in trainable parameters and computational complexity. To evaluate the proposed method, the Indian Pines dataset along with WHU-Hi subdatasets (LongKou-LK, HanChuan-HC, and HongHu-HH) were employed. Employing a 5% training sample, impressive overall accuracy scores were achieved: 94.51%, 99.78%, 97.06%, and 97.27% for Indian Pines, WHU-LK, WHU-HC, and WHU-HH, respectively. Comparative analysis of the proposed approach with cutting-edge techniques within the literature reveals its superior performance across the four HRSI datasets. Notably, the Hybrid DSCNet attains enhanced classification accuracy while maintaining lower computational overhead.
Spatial-spectral classification of hyperspectral remote sensing images using 3D CNN based LeNet-5 architecture
(Elsevier, 2022) Firat, Hueseyin; Asker, Mehmet Emin; Bayindir, Mehmet Ilyas; Hanbay, Davut
Hyperspectral remote sensing image (HRSI) analysis are commonly used in a wide variety of remote sensing applications such as land cover analysis, military surveillance, object detection and precision agriculture. Deep learning is seen as an effective method to improve HRSI classification. In particular, convolutional neural net-works (CNNs) are increasingly used in this field. The high dimensionality of the HRSIs increases the computa-tional complexity. Thus, most of studies apply dimension reduction as preprocessing. Another problem in HRSI classification is that spatial-spectral features must be considered in order to obtain accurate results. Because, HRSI classification results are highly dependent on spatiospectral information. The aim of this paper is to build a 3D CNN-based LeNet-5 method for HRSI classification. Principal component analysis (PCA) is used as the pre-processing step for optimum spectral band extraction. 3D CNN is used to simultaneously extract spatial -spectral features in HRSIs. LeNet-5 architecture has a simple and straightforward architecture. At the same time, the number of trainable parameters is very low. With the use of the LeNet-5 architecture, the number of trainable parameters of the proposed method is considerably reduced. This is one of the most important features that distinguish the proposed method from other deep learning methods. The proposed method is tested with Indian pines, Pavia University and Salinas datasets. As a result of experimental studies, 100% overall accuracy result is obtained in all datasets. The proposed 3DLeNet method is compared against various state-of-the-art CNN based methods. From the experimental results, it is seen that our 3DLeNet method performs more accurate result. It has also been found that the proposed 3DLeNet method shows a satisfactory result with less computational complexity.

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