Patent ID: 6996286
Filing Date: 2006-02-07
Classification: G06T

Abstract:
1. A method of providing a spatially filtered version of an image by selectively modifying image pixel amplitudes as a predetermined function of spatial frequency components of the image pixels, comprising: dividing an overall frequency range of the image into a plurality of constituent frequency ranges; providing, for each of the constituent frequency ranges, a spatial filter that receives the image pixels and produces a filtered output representative of the spatial frequency components of the pixels that are within that constituent frequency range; scaling image pixel amplitude values for each of the filtered outputs by a scaling factor specific to the associated spatial filter, so as to produce a scaled output; and, combining the scaled outputs to produce a composite output representative of the spatially filtered version of the image wherein the scaling factors vary as a function of time so as to sweep a pass-band having a predetermined bandwidth across the overall frequency range, such that image components characterized by frequencies within the pass-band are enhanced or passed without substantial attenuation.