Title :
An explicit sharpness index related to global phase coherence
Author :
Blanchet, Gwendoline ; Moisan, Lionel
Author_Institution :
Centre Nat. d´´Etudes Spatiales, Toulouse, France
Abstract :
We propose a definition of a Sharpness Index that is closely related to the notion of Global Phase Coherence recently introduced for automatic image restoration and image quality assessment. Using Gaussian random fields instead of random phase images, we can estimate the probability that a random image has a given Total Variation, which leads us to an explicit formula and a fast algorithm. Theoretical arguments and numerical experiments are given to assess the similarity between the Sharpness Index and the Global Phase Coherence, and an application to non-parametric blind deconvolution is presented, that illustrates the possibilities offered by this new approach.
Keywords :
Gaussian processes; image restoration; numerical analysis; probability; Gaussian random fields; automatic image restoration; explicit sharpness index; global phase coherence; image quality assessment; nonparametric blind deconvolution; numerical experiments; probability; random phase images; Coherence; Convolution; Deconvolution; Image restoration; Indexes; Kernel; Noise; blind deconvolution; global phase coherence; image quality; image restoration; sharpness;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0045-2
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2012.6288070