Patent ID: 7577309
Filing Date: 2009-08-18
Classification: G06T,H04N

Abstract:
1. A method of determining a focused image f(x,y) of a scene with respect to a camera, said scene having a 3D shape z(x,y) which is characterized by a shape parameter vector z, and said camera characterized by a set of camera parameters e p , said method comprising: (a) recording a set of images g (b) obtaining a set of normalized images by preprocessing said set of images g (c) computing a set of derivatives g (d) determining the localized shift-variant point spread function (SV-PSF) h from said non-localized PSF h′ using the novel Rao Localization Transform expressed in the form where (x,y) specifies the position where image brightness is measured and (α,β) specifies the position of surrounding image points which are contributing to light measured at (x,y); (e) deriving a set of expressions for the various moments with respect to α and β of the derivatives with respect to x and y of the localized SV-PSF h (f) deriving a system of P algebraic equations that express said focused image f(x,y) as a weighted sum of the derivatives of said set of normalized images g (g) solving said system of P algebraic equations to obtain said focused image f(x,y) at each point (x,y), and providing it as digital image output.