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I know that:
Image Alignment: is the process of finding the spatial mapping, i.e. elements in one image into meaningful correspondence with elements in a second image.
And
Image Registration: is the process of aligning two or more images of the same scene.
I don't see and difference between these two definitions, could anyone clarify the difference to me?
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Registration is the process of finding common areas of curvature and orienting the overlapping portions of the scans together. Typically 10% of overlap is required to successfully register scans together. Alignment moves one object into alignment with another object so that they both share the same coordinate system.
Image registration is defined as a process that overlays two or more images from various imaging equipment or sensors taken at different times and angles, or from the same scene to geometrically align the images for analysis (Zitová and Flusser, 2003).
Image registration, also known as image fusion, matching or warping, can be defined as the process of aligning two or more images. The goal of an image registration method is to find the optimal transformation that best aligns the structures of interest in the input images.
Image registration is a digital image processing discipline that studies how to bring two or more digital images into precise alignment for analysis and comparison. Accurate registration algorithms are essential for creating mosaics of satellite images and tracking changes on the planet's surface over time.
I don't think there is a formal distinction and both words are used interchangeably.
If you were to nit-pick, then finding a transformation from one image to another ("alignment" per your definition) is a distinct process than actually performing the image warping procedure ("registration" per your definition).
Often the transformation is what you need and warping is not always required.
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