Local mean and variance of an image for normalisation

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Newman
Newman 2017-3-29
回答： Image Analyst 2022-12-3
Hello i want to normalise my image of size 112x98 using a concept of local mean and local variance.I wan to first convert my image into W flat regions of size NXN pixels and then compute the local mean and variance of these regions.
The normalisation end formula for the whole image would be then
I=I-mean_I;%% where mean_I is a 112x98 size image containing the local mean of all the w regions .
final=I/Var_T%%%% where Var_I is a 112x98 size image containing the local variance of all the w regions .
Can someone please help me on how to code this stuff on matlab.
for reference please see this paper :
https://www.researchgate.net/publication/220645679_An_efficient_illumination_normalization_method_for_face_recognition?enrichId=rgreq-698f59d062a0b9eca888b694406525ab-XXX&enrichSource=Y292ZXJQYWdlOzIyMDY0NTY3OTtBUzo5NzE0NjM4ODg3NzMzMEAxNDAwMTcyOTEyOTE1&el=1_x_3&_esc=publicationCoverPdf

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回答（1 个）

Image Analyst
Image Analyst 2022-12-3
Check out imfilter or conv2 for the local mean.
Check out stdfilt for the local standard deviation.

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