How can i use zero-padding in an image?

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Gn Gnk 2020-10-13

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评论： Image Analyst 2020-10-13

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Hello ,

I have an image(512x512) and i want to do zero-padding in order to covolute it with a filter .

The problem here is that i dont know how to do that ,meaning that i dont know where the zeros should be (around the image or next to it) and furthermore the size of the zero-padding.

Any help would be valuable.

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Image Analyst 2020-10-13

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There is a built-in function for that. It's called padarray().

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Gn Gnk 2020-10-13

Great ! Thank you a lot.

Image Analyst 2020-10-13

convolution_manual.m

Manual convolution demo attached.

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Ameer Hamza 2020-10-13

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编辑：Ameer Hamza 2020-10-13

在 MATLAB Online 中打开

You don't need to do padding yourself. imfilter(): https://www.mathworks.com/help/images/ref/imfilter.html automatically does it based on the option you pass

filtered_image = imfilter(img, fil, 'same')

If you want to understand the concept behind it, then this link might be helpful: https://machinelearningmastery.com/padding-and-stride-for-convolutional-neural-networks/