why should i subtract mean of image when searching for position of sub-image in image?

Question

Dror Aizik 2020년 5월 14일

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Direct link to this question

https://kr.mathworks.com/matlabcentral/answers/525416-why-should-i-subtract-mean-of-image-when-searching-for-position-of-sub-image-in-image

답변: Jalaj Gambhir 2020년 8월 27일

i have tried several times to find position of sub-image inside the bigger image, and i found out that i must substract the mean of the images for it.

i still couldn't understand why.

can someone help please?

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Answer 1

Jalaj Gambhir 2020년 8월 27일

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이 답변에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/525416-why-should-i-subtract-mean-of-image-when-searching-for-position-of-sub-image-in-image#answer_485750

Hi,

I am not sure the complete process that you are following, but subtraction with mean Image is generally done to center the image. It is a common preprocessing step for most Image Processing algorithms.

Hope this helps!