How can I move a binary image to the center?

I'm trying to make a character segmentation. I've succesfully extracted the characters but now I need to keep the important bits in the center of the 28x28 image AUTOMATICALLY since it somehow messes up classification. In this instance, this 1 somehow gets read as a 7

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Answer 1

[DGM]

Without knowing how the object images were obtained, it's hard to say how to change the process. You should have the bounding box information for each object. It's then up to you to get that image region and pad it to a fixed geometry. You can use padarray(), but you'll have to calculate individual padding widths.

This is an example using rice grains. A lot of the discussion about masking can be ignored. The relevant part is the padding.

https://www.mathworks.com/matlabcentral/answers/847255-segmentation-of-rice-grains-and-sub-plotting-individual-grains

Answer 2

[Image Analyst]

I don't think it should matter if you're doing classification properly. Here's one way:

https://www.mathworks.com/help/supportpkg/android/ref/digit-classification-using-hog-features-on-mnist-database.html?s_tid=srchtitle_mnist%20classification_3