Is Feature extraction step required in CNN?

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hla hla myint 2020-10-18

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评论： hla hla myint 2020-10-20

I research 3 D volumetric brain tumor segmentation using CNN. Is activation map the feature extraction in CNN?. So i want to know the feature extraction in CNN. Is Feature extraction step required in CNN?

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Ameer Hamza 2020-10-18

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Not explicitly. You can do some pre-processing, but you don't need to extract features yourself. The whole point of using a CNN is that we do need to decide which features are important for a specific problem. It should learn important features during the training process.