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Image registration shows up in a rich range of application domains, such as medical image analysis (e.g. diagnosis), neuroscience (e.g. brain mapping), computer vision (e.g. stereo image matching for shape recovery), astrophysics (e.g. the alignment of images from different frequencies), military applications (e.g. target recognition), etc Image registration is an important step for a great variety of applications such as remote sensing, medical imaging and multi-sensor fusion based target recognition. It is a prerequisite step prior to image fusion or image mosaic. Its purpose is to overlay two or more images of the same scene taken at different times, from different viewpoints and/or by different sensors. It is also necessary to estimate the accuracy of the image registration process .In this paper we review the different image registration methods as well as the validation techniques.