comparing two images

[hanoun]

Can someone help  me and tell with methods of opencv   can I use to compare them?

[Andrey Pavlenko]

it's not clear what do you mean saying 'to compare images'...

if 2 images have the same type and size you can get a new image containing their difference with Core.absdiff() function (http://opencv.itseez.com/modules/core/doc/operations_on_arrays.html#absdiff)

or you can make per element comparison with Core.compare() function (http://opencv.itseez.com/modules/core/doc/operations_on_arrays.html#compare)