使用matlab,利用CNN算法实现对蒲公英、玫瑰花、百合花、牵牛花的识别代码
时间: 2024-01-01 22:04:33 浏览: 29
以下是一个简单的基于CNN算法对花朵进行分类的matlab代码,可以根据需要进行修改和优化:
首先,需要准备好花朵的数据集,将不同种类的花朵图片分别放入对应的文件夹中,并将这些文件夹放在同一个父文件夹下,命名为“FlowerDataset”。使用ImageDatastore函数加载数据集。
```
imds = imageDatastore('FlowerDataset',...
'IncludeSubfolders',true,...
'LabelSource','foldernames');
```
然后,需要将数据集划分为训练集和测试集,一般选择70%的数据作为训练集,30%的数据作为测试集。使用splitEachLabel函数划分数据集。
```
[imdsTrain,imdsTest] = splitEachLabel(imds,0.7,'randomized');
```
使用augmentedImageDatastore函数进行数据增强,增加数据集的多样性,提高模型的鲁棒性。
```
imageSize = [224 224 3];
augmenter = imageDataAugmenter('RandRotation',[-30 30],...
'RandXTranslation',[-3 3],'RandYTranslation',[-3 3]);
augimdsTrain = augmentedImageDatastore(imageSize,imdsTrain,...
'DataAugmentation',augmenter);
augimdsTest = augmentedImageDatastore(imageSize,imdsTest);
```
选择一个预训练的网络作为基础模型,可以选择AlexNet、VGG16、ResNet等。使用trainNetwork函数进行训练,其中网络层数可以根据需要进行修改,例如在VGG16的基础上增加几层全连接层。
```
net = vgg16;
inputSize = net.Layers(1).InputSize;
layersTransfer = net.Layers(1:end-3);
numClasses = numel(categories(imdsTrain.Labels));
layers = [
layersTransfer
fullyConnectedLayer(numClasses,'WeightLearnRateFactor',20,'BiasLearnRateFactor',20)
softmaxLayer
classificationLayer];
options = trainingOptions('sgdm',...
'MiniBatchSize',32,...
'MaxEpochs',6,...
'InitialLearnRate',1e-4,...
'Shuffle','every-epoch',...
'ValidationData',augimdsTest,...
'ValidationFrequency',30,...
'Verbose',false,...
'Plots','training-progress');
netTransfer = trainNetwork(augimdsTrain,layers,options);
```
训练完成后,可以使用classify函数对测试集进行分类,并计算准确率。
```
YPred = classify(netTransfer,augimdsTest);
YTest = imdsTest.Labels;
accuracy = mean(YPred == YTest);
fprintf("Accuracy = %.2f%%\n",accuracy*100);
```
完整代码如下:
```
imds = imageDatastore('FlowerDataset',...
'IncludeSubfolders',true,...
'LabelSource','foldernames');
[imdsTrain,imdsTest] = splitEachLabel(imds,0.7,'randomized');
imageSize = [224 224 3];
augmenter = imageDataAugmenter('RandRotation',[-30 30],...
'RandXTranslation',[-3 3],'RandYTranslation',[-3 3]);
augimdsTrain = augmentedImageDatastore(imageSize,imdsTrain,...
'DataAugmentation',augmenter);
augimdsTest = augmentedImageDatastore(imageSize,imdsTest);
net = vgg16;
inputSize = net.Layers(1).InputSize;
layersTransfer = net.Layers(1:end-3);
numClasses = numel(categories(imdsTrain.Labels));
layers = [
layersTransfer
fullyConnectedLayer(numClasses,'WeightLearnRateFactor',20,'BiasLearnRateFactor',20)
softmaxLayer
classificationLayer];
options = trainingOptions('sgdm',...
'MiniBatchSize',32,...
'MaxEpochs',6,...
'InitialLearnRate',1e-4,...
'Shuffle','every-epoch',...
'ValidationData',augimdsTest,...
'ValidationFrequency',30,...
'Verbose',false,...
'Plots','training-progress');
netTransfer = trainNetwork(augimdsTrain,layers,options);
YPred = classify(netTransfer,augimdsTest);
YTest = imdsTest.Labels;
accuracy = mean(YPred == YTest);
fprintf("Accuracy = %.2f%%\n",accuracy*100);
```