A level set method based on additive bias correction

Level Set; additive bias correction model; Intensity inhomogeneity ;image segmentation;Active contour model;

This is a Matlab implementation of our paper: Weng Guirong et al. 'A level set method based on additive bias correction for image segmentation'. Expert Systems With Applications 185 (2021) 115633.

In this paper, an additive bias correction (ABC) model based on intensity inhomogeneity is proposed.The model divides the observed image into three parts: additive bias function,reflection edge structure function and Gaussian noise.

Model theory: Image observed I(x), i(x) =log(I(x), i(x) = b(x) + r(x) + n(x);

matlab code --- Demo_ABC.m, ABC_Switch.m, ABC_2D.m

https://github.com/sdjswgr

A: the bias field b is supposed to be varying smoothly,

B: the spatial derivatives of the observed intensity are mostly due to edges in the reflectance r.

C: n is additive noise, The additive noise n can be assumed to be zero-mean Gaussian noise.

D: b is assumed to be piecewise (approximately)constant in a local region.

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