Patent ID: 7102793
Filing Date: 2006-09-05
Classification: G06T,H04N

Abstract:
1. A method of filtering an input image, comprising: creating a boolean tone map based on the input image and an array of tone nodes; determining whether or not a target pixel is in a tone region by examining the target pixel and a neighboring region of pixels; and if the target pixel is in a tone region, selecting a first base-filter for the tone region; scaling the first base-filter based on an image resolution of the input image to create a scaled filter by determining a scale factor such that the scale factor may be used to map the base filter to the scaled filter; and applying the scaled filter to the target pixel; wherein the variance of the two-dimensional convolution of the input image and the scaled filter is substantially equal to the variance of the two-dimensional convolution of the first base-filter and an interpolated image of the input image having a resolution matching the resolution of the first base-filter.