Acta Optica Sinica, Volume. 39, Issue 4, 0410001(2019)
Landform Image Classification Based on Sparse Coding and Convolutional Neural Network
Figures & Tables(10)
Fig. 4. Feature visualization of image blocks with size of 14×14 on two databases by using SC. (a) UAV landform database 3, before feature sorting; (b) UAV landform database 3, after feature sorting; (c) UC Merced LU database, before feature sorting (d) UC Merced LU database, after feature sorting
Fig. 5. Training convergence curves for UC Merced LU database. (a) Training convergence curves obtained with four different methods; (b) training convergence curves obtained with SC-CNN algorithm
Fig. 6. Confusion matrix obtained by classify landforms with SC-CNN algorithm SC-CNN
Fig. 7. Classification effect maps of complex landforms image. (a) Landform image; (b) artificial landform division; (c) post-blocking image; (d) landform classification effect map
Table 1. Network structure of model based on SC and CNN
View tableTable 1. Network structure of model based on SC and CNN
Layer Type Patch size Stride Zero padding Output size x Input 256×256×3 h 1Convolution 5×5 5 2 128×128×64 h 2ReLU 128×128×64 h 3Mean pooling 3×3 2 64×64×64 h 4Convolution 3×3 2 0 32×32×64 h 5ReLU 32×32×64 h 6Max pooling 3×3 2 16×16×64 h 7Convolution 7×7 1 2 14×14×128 h 8ReLU 14×14×128 h 9Max pooling 3×3 2 7×7×128 h 10Convolution 7×7 1 0 1×1×128 h 11ReLU 1×1×128 h 12Convolution 1×1 1 0 1×1×20 o SVM v
Table 2. Classification accuracy of different algorithms on UC Merced LU database
View tableTable 2. Classification accuracy of different algorithms on UC Merced LU database
Algorithm Training accuracy /% Training time /h SVM 78.57 0.7 CS-CNN[ 12 ]92.86 4.5 PSR[ 13 ]89.10 5.2 MS-DCNN[ 11 ]91.34 5.9 SC-CNN 98.14 4.3
Table 3. Classification accuracy of existing methods on UAV landform database 3
View tableTable 3. Classification accuracy of existing methods on UAV landform database 3
Algorithm Training accuracy /% Training time /h SVM 76.96 2.6 CS-CNN[ 12 ]92.91 12.9 MS-DCNN[ 11 ]91.53 13.7 PCANet[ 14 ]86.49 11.1 SC-CNN 97.50 10.5
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Fang Liu, Xin Wang, Lixia Lu, Guangwei Huang, Hongjuan Wang. Landform Image Classification Based on Sparse Coding and Convolutional Neural Network[J]. Acta Optica Sinica, 2019, 39(4): 0410001
Paper Information
Category: Image Processing
Received: Sep. 18, 2018
Accepted: Dec. 12, 2018
Published Online: May. 10, 2019
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