卷积神经网络 - 如何获取特征图?
我读了一些关于卷积神经网络的书籍和文章,似乎我理解这个概念,但我不知道如何将其表达出来,如下图所示:
(来源:什么-何时-如何。 com)
从 28x28 标准化像素输入中,我们得到 4 个大小为 24x24 的特征图。但如何获得它们呢?调整输入图像的大小?或执行图像转换?但什么样的转变呢?或者将输入图像切割成 4 个大小为 24x24 x 4 角的块?我不明白这个过程,对我来说,他们似乎在每一步都会将图像切割或调整为较小的图像。请帮忙谢谢。
I read a few books and articles about Convolutional neural network, it seems I understand the concept but I don't know how to put it up like in image below:
(source: what-when-how.com)
from 28x28 normalized pixel INPUT we get 4 feature maps of size 24x24. but how to get them ? resizing the INPUT image ? or performing image transformations? but what kind of transformations? or cutting the input image into 4 pieces of size 24x24 by 4 corner? I don't understand the process, to me it seem they cut up or resize the image to smaller images at each step. please help thanks.
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这是 CONV2 函数的 matlab 帮助文件,在 CNN Matlab 中使用(获取卷积层)。仔细阅读,你就会看到答案。
This is matlab help file for CONV2 function, which use in CNN Matlab (to get convolutional layers). Read it carefully and you will see your answer.