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Object Extraction from Background

Hello, i'm working on a project for extracting objets from background : the input i have is an image for the background and a second image for those object in the same background

those 2 images are take with the same camera but not with the same position(the positio of the camera could be a little differente)

i have subtract those two images(background_image - second image) , it didnt' give an accurate result due to :

that i need to align those 2 images first(rotation, translatio, scale..) also there is athe shadow problem !!! How i can fix it?? any solution and suggestion please?

here is a simple images :

background image :

image description

second image with objects :

image description

result image(subtraction ) :

image description

Thank you