基于matlab的alexnet的cam可视化分析代码
时间: 2023-11-22 08:54:36 浏览: 39
以下是基于Matlab的AlexNet CAM可视化分析代码:
首先,加载预训练的AlexNet模型:
```matlab
net = alexnet;
```
然后,选择要进行CAM可视化分析的图像并将其调整为网络所需的大小(227x227像素):
```matlab
im = imread('example.jpg');
im = imresize(im, [227 227]);
```
接下来,计算模型的最后一层卷积层的输出和权重。这可以通过使用`activations`函数来完成:
```matlab
act = activations(net, im, 'conv5');
w = net.Layers(end).Weights;
```
接下来,计算类别得分并选择最高的类别:
```matlab
class = classify(net, im);
scores = squeeze(sum(sum(bsxfun(@times, act, w), 1), 2));
score = scores(class);
```
然后,计算CAM(类激活映射):
```matlab
cam = bsxfun(@times, act, w);
cam = sum(cam, 3);
cam = cam(:,:,class);
cam = imresize(cam, [227 227]);
cam = mat2gray(cam);
```
最后,将CAM叠加在原始图像上以进行可视化:
```matlab
overlay = imoverlay(im, cam, 'Colormap', jet(255));
imshow(overlay)
```
完整的代码如下:
```matlab
net = alexnet;
im = imread('example.jpg');
im = imresize(im, [227 227]);
act = activations(net, im, 'conv5');
w = net.Layers(end).Weights;
class = classify(net, im);
scores = squeeze(sum(sum(bsxfun(@times, act, w), 1), 2));
score = scores(class);
cam = bsxfun(@times, act, w);
cam = sum(cam, 3);
cam = cam(:,:,class);
cam = imresize(cam, [227 227]);
cam = mat2gray(cam);
overlay = imoverlay(im, cam, 'Colormap', jet(255));
imshow(overlay)
```