Time-varying laser speckle in the image plane is used to measure the shape and rotation rate of rotationally symmetric objects. The analysis is based on the space–time correlation function of the intensity in the image plane, which is derived from a geometrical model for the correlation function of the optical field in the object plane. The geometrical model is developed using the method of stationary phase. Experimental results obtained using a linear detector array located in the image plane are given.
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Marron et al. (1985) studied this question.
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