Title :
Closed-Form Correlation Model of Oriented Bandpass Natural Images
Author :
Che-Chun Su ; Cormack, Lawrence K. ; Bovik, Alan C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Texas at Austin, Austin, TX, USA
Abstract :
Most prevalent statistical models of natural images characterize only the univariate distributions of divisively normalized bandpass responses or wavelet-like decompositions of them. However, the higher-order dependencies between spatially neighboring responses are not yet well understood. Towards filling this gap, we propose a new closed-form spatial-oriented correlation model that captures statistical regularities between perceptually decomposed natural image luminance samples. We validate the new correlation model on a variety of natural images. Experimental results demonstrate the robustness of the new correlation model across image content. A software release that implements the new closed-form spatial-oriented correlation model is available at http://live.ece.utexas.edu/research/3dnss/bicorr_release.zip.
Keywords :
image processing; statistical analysis; closed-form spatial-oriented correlation model; natural image luminance samples; normalized bandpass responses; oriented bandpass natural images; statistical regularities; univariate distributions; wavelet-like decompositions; Computational modeling; Correlation; Gaussian distribution; Hidden Markov models; Histograms; Joints; Wavelet transforms; Bivariate model; closed-form; natural scene statistics (NSS); spatial-oriented correlation model;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2345765
