Efficient Rotation-Scaling-Translation Parameter Estimation Based on the Fractal Image ModelReport as inadecuate




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1 National Taras Shevchenko University Kiev, Ukraine 2 ENSSAT - École Nationale Supérieure des Sciences Appliquées et de Technologie 3 IETR - Institut d-Electronique et de Télécommunications de Rennes

Abstract : This paper deals with area-based subpixel image registration under the rotation-isometric scaling-translation transformation hypothesis. Our approach is based on parametrical modeling of geometrically transformed textural image fragments and maximum-likelihood estimation of the transformation vector between them. Due to the parametrical approach based on the fractional Brownian motion modeling of the local fragments- texture, the proposed estimator MLfBm ML stands for -maximum likelihood- and fBm stands for -fractal Brownian motion- has the ability to better adapt to real image texture content compared with other methods relying on universal similarity measures such as mutual information or normalized correlation. The main benefits are observed when assumptions underlying the fBm model are fully satisfied, e.g., for isotropic normally distributed textures with stationary increments. Experiments on both simulated and real images and for high and weak correlations between registered images show that the MLfBm estimator offers significant improvement compared with other state-of-the-art methods. It reduces translation vector, rotation angle, and scaling factor estimation errors by a factor of about 1.75-2, and it decreases the probability of false match by up to five times. In addition, an accurate confidence interval for MLfBm estimates can be obtained from the Cramer-Rao lower bound on rotation-scaling-translation parameter estimation error. This bound depends on texture roughness, noise level in reference and template images, correlation between these images, and geometrical transformation parameters

Keywords : registration Performance performance limits Area-based image registration Artifacts Cramer-Rao lower bound CRLB Fisher information fractional Brownian motion model Hyperion hyperspectral imagery intensity isometric scaling Landsat 8 maximum-likelihood estimation MLE mutual-information rotation signal-dependent noise subpixel registration translation





Author: Mikhail L. Uss - Benoit Vozel - Vladimir V. Lukin - Kacem Chehdi -

Source: https://hal.archives-ouvertes.fr/



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