title: Regularization operators for natural images based on nonlinear perception models.
abstract: Image restoration requires some a priori knowledge of the solution. Some of the conventional regularization techniques are based on the estimation of the power spectrum density. Simple statistical models for spectral estimation just take into account second-order relations between the pixels of the image. However, natural images exhibit additional features, such as particular relationships between local Fourier or wavelet transform coefficients. Biological visual systems have evolved to capture these relations. We propose the use of this biological behavior to build regularization operators as an alternative to simple statistical models. The results suggest that if the penalty operator takes these additional features in natural images into account, it will be more robust and the choice of the regularization parameter is less critical.
authors.affiliation: Department d'Informàtica and the VISTA Laboratory, Universitat de València, 50. 46100 Burjassot,València, Spain. juan.gutierrez@uv.es
authors.forename: Juan
authors.initials: J
authors.lastname: Gutiérrez
authors.forename: Francesc J
authors.initials: FJ
authors.lastname: Ferri
authors.forename: Jesús
authors.initials: J
authors.lastname: Malo
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D016000:Cluster Analysis; D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D009716:Numerical Analysis, Computer-Assisted; D010363:Pattern Recognition, Automated / Q000379:methods*; D012815:Signal Processing, Computer-Assisted