Abstract
The registration of speckle images plays a key role in many fields, such as: material mechanics; accident monitoring; geodetic survey; missile guidance. Speckle image is composed of a large number of random spots, that it is difficult to obtain obvious feature values through feature extraction. Digital speckle correlation method is to directly extract the surface displacement and deformation information of objects from digital images, so all kinds of digital images can be used as processing objects. However, when the target image quality is poor or has a large deformation, its registration accuracy is difficult to reach the sub-pixel level. In this paper, we will study and analyze the key technologies of existing digital speckle correlation methods.
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