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Maximum-likelihood multiresolution laser radar range imaging

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3 Author(s)
Greer, D.R. ; Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA ; Fung, I. ; Shapiro, J.H.

Maximum-likelihood range imaging is considered for pulsed-imager operation of a coherent laser radar. The expectation-maximization (EM) algorithm is used to develop an explicit procedure for maximum-likelihood fitting of a multiresolution (wavelet) basis-at a sequence of increasingly fine resolutions-to laser radar range data. Specialization to the Haar-wavelet basis yields a procedure that is both computationally efficient and numerically robust. Basic analytical properties of the estimation algorithm and its performance are presented, along with results based on simulated and real laser radar range data. It is shown that the weights associated with the expectation-maximization iterations provide a reliable indicator for terminating the coarse-to-fine resolution progression. At the weight-determined stopping point, estimation performance approaches the ultimate limit set by the complete-data bound

Published in:

Image Processing, IEEE Transactions on  (Volume:6 ,  Issue: 1 )

Date of Publication:

Jan 1997

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